UNOMI-202 : Added patch service , command and rest endpoint
diff --git a/api/src/main/java/org/apache/unomi/api/Patch.java b/api/src/main/java/org/apache/unomi/api/Patch.java
new file mode 100644
index 0000000..9380ef8
--- /dev/null
+++ b/api/src/main/java/org/apache/unomi/api/Patch.java
@@ -0,0 +1,91 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.unomi.api;
+
+import org.apache.unomi.api.actions.ActionType;
+import org.apache.unomi.api.campaigns.Campaign;
+import org.apache.unomi.api.conditions.ConditionType;
+import org.apache.unomi.api.goals.Goal;
+import org.apache.unomi.api.rules.Rule;
+import org.apache.unomi.api.segments.Scoring;
+import org.apache.unomi.api.segments.Segment;
+
+import java.util.Date;
+import java.util.Map;
+import java.util.TreeMap;
+
+public class Patch extends Item {
+
+    public final static Map<String, Class<? extends Item>> PATCHABLE_TYPES;
+
+    static {
+        PATCHABLE_TYPES = new TreeMap<>();
+        PATCHABLE_TYPES.put("condition", ConditionType.class);
+        PATCHABLE_TYPES.put("action", ActionType.class);
+        PATCHABLE_TYPES.put("goal", Goal.class);
+        PATCHABLE_TYPES.put("campaign", Campaign.class);
+        PATCHABLE_TYPES.put("persona",Persona.class);
+        PATCHABLE_TYPES.put("property",PropertyType.class);
+        PATCHABLE_TYPES.put("rule", Rule.class);
+        PATCHABLE_TYPES.put("segment", Segment.class);
+        PATCHABLE_TYPES.put("scoring", Scoring.class);
+    }
+
+    public static final String ITEM_TYPE = "patch";
+
+    private String patchedItemId;
+
+    private String operation;
+
+    private Object data;
+
+    private Date lastApplication;
+
+    public String getPatchedItemId() {
+        return patchedItemId;
+    }
+
+    public void setPatchedItemId(String patchedItemId) {
+        this.patchedItemId = patchedItemId;
+    }
+
+    public String getOperation() {
+        return operation;
+    }
+
+    public void setOperation(String operation) {
+        this.operation = operation;
+    }
+
+
+    public Object getData() {
+        return data;
+    }
+
+    public void setData(Object data) {
+        this.data = data;
+    }
+
+    public Date getLastApplication() {
+        return lastApplication;
+    }
+
+    public void setLastApplication(Date lastApplication) {
+        this.lastApplication = lastApplication;
+    }
+}
diff --git a/api/src/main/java/org/apache/unomi/api/services/PatchService.java b/api/src/main/java/org/apache/unomi/api/services/PatchService.java
new file mode 100644
index 0000000..47f53ca
--- /dev/null
+++ b/api/src/main/java/org/apache/unomi/api/services/PatchService.java
@@ -0,0 +1,34 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.unomi.api.services;
+
+import org.apache.unomi.api.Item;
+import org.apache.unomi.api.Patch;
+
+import java.net.URL;
+import java.util.Enumeration;
+
+public interface PatchService {
+    Patch load(String id);
+
+    void patch(Enumeration<URL> urls, Class<? extends Item> type);
+
+    void patch(URL patchUrl, Class<? extends Item> type);
+
+    <T extends Item> T patch(Patch patch, Class<T> type) ;
+}
+
diff --git a/kar/src/main/feature/feature.xml b/kar/src/main/feature/feature.xml
index 012ad0d..4301c38 100644
--- a/kar/src/main/feature/feature.xml
+++ b/kar/src/main/feature/feature.xml
@@ -34,6 +34,11 @@
         <configfile finalname="/etc/org.apache.unomi.geonames.cfg">mvn:org.apache.unomi/cxs-geonames-services/${project.version}/cfg/geonamescfg</configfile>
         <bundle start-level="75">mvn:commons-io/commons-io/2.4</bundle>
         <bundle start-level="75">mvn:com.fasterxml.jackson.core/jackson-core/${version.jackson.core}</bundle>
+        <bundle start-level="75">mvn:com.github.fge/btf/1.2</bundle>
+        <bundle start-level="75">mvn:com.github.fge/msg-simple/1.1</bundle>
+        <bundle start-level="75">mvn:com.google.guava/guava/16.0.1</bundle>
+        <bundle start-level="75">mvn:com.github.fge/jackson-coreutils/1.8</bundle>
+        <bundle start-level="75">mvn:com.github.fge/json-patch/1.9</bundle>
         <bundle start-level="75">mvn:com.fasterxml.jackson.core/jackson-databind/${version.jackson.core}</bundle>
         <bundle start-level="75">mvn:com.fasterxml.jackson.core/jackson-annotations/${version.jackson.core}</bundle>
         <bundle start-level="75">mvn:com.fasterxml.jackson.jaxrs/jackson-jaxrs-base/${version.jackson.core}</bundle>
diff --git a/rest/src/main/java/org/apache/unomi/rest/PatchServiceEndPoint.java b/rest/src/main/java/org/apache/unomi/rest/PatchServiceEndPoint.java
new file mode 100644
index 0000000..20f7cd8
--- /dev/null
+++ b/rest/src/main/java/org/apache/unomi/rest/PatchServiceEndPoint.java
@@ -0,0 +1,60 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.unomi.rest;
+
+import org.apache.cxf.rs.security.cors.CrossOriginResourceSharing;
+import org.apache.unomi.api.Patch;
+import org.apache.unomi.api.services.PatchService;
+
+import javax.jws.WebService;
+import javax.ws.rs.*;
+import javax.ws.rs.core.MediaType;
+
+/**
+ * A JAX-RS endpoint to manage patches.
+ */
+@WebService
+@Produces(MediaType.APPLICATION_JSON)
+@Consumes(MediaType.APPLICATION_JSON)
+@CrossOriginResourceSharing(
+        allowAllOrigins = true,
+        allowCredentials = true
+)
+public class PatchServiceEndPoint {
+
+    private PatchService patchService;
+
+    public void setPatchService(PatchService patchService) {
+        this.patchService = patchService;
+    }
+
+    /**
+     * Apply a patch on an item
+     *
+     * @param type the type of item to patch
+     */
+    @POST
+    @Path("/apply/{type}")
+    public void setPatch(Patch patch, @PathParam("type") String type, @QueryParam("force") Boolean force) {
+        Patch previous = (force == null || !force) ? patchService.load(patch.getItemId()) : null;
+        if (previous == null) {
+            patchService.patch(patch, Patch.PATCHABLE_TYPES.get(type));
+        }
+    }
+
+}
diff --git a/rest/src/main/resources/OSGI-INF/blueprint/blueprint.xml b/rest/src/main/resources/OSGI-INF/blueprint/blueprint.xml
index 2741fcf..082bf7b 100644
--- a/rest/src/main/resources/OSGI-INF/blueprint/blueprint.xml
+++ b/rest/src/main/resources/OSGI-INF/blueprint/blueprint.xml
@@ -178,6 +178,18 @@
         </jaxrs:serviceBeans>
     </jaxrs:server>
 
+    <jaxrs:server address="/patches" id="restPatchService">
+        <jaxrs:providers>
+            <ref component-id="jaxb-provider"/>
+            <ref component-id="cors-filter"/>
+            <ref component-id="jaas-filter"/>
+        </jaxrs:providers>
+
+        <jaxrs:serviceBeans>
+            <ref component-id="patchServiceEndPoint"/>
+        </jaxrs:serviceBeans>
+    </jaxrs:server>
+
     <reference id="segmentService" interface="org.apache.unomi.api.services.SegmentService"/>
     <reference id="userListService" interface="org.apache.unomi.api.services.UserListService"/>
     <reference id="definitionsService" interface="org.apache.unomi.api.services.DefinitionsService"/>
@@ -187,6 +199,7 @@
     <reference id="clusterService" interface="org.apache.unomi.api.services.ClusterService"/>
     <reference id="queryService" interface="org.apache.unomi.api.services.QueryService"/>
     <reference id="eventService" interface="org.apache.unomi.api.services.EventService"/>
+    <reference id="patchService" interface="org.apache.unomi.api.services.PatchService"/>
 
     <bean id="segmentServiceEndPoint" class="org.apache.unomi.rest.SegmentServiceEndPoint">
         <property name="segmentService" ref="segmentService"/>
@@ -233,6 +246,10 @@
         <property name="localizationHelper" ref="localizationHelper"/>
     </bean>
 
+    <bean id="patchServiceEndPoint" class="org.apache.unomi.rest.PatchServiceEndPoint">
+        <property name="patchService" ref="patchService"/>
+    </bean>
+
     <bean id="resourceBundleHelper" class="org.apache.unomi.rest.ResourceBundleHelper">
         <property name="bundleContext" ref="blueprintBundleContext"/>
     </bean>
diff --git a/services/pom.xml b/services/pom.xml
index ed07557..b6e4afb 100644
--- a/services/pom.xml
+++ b/services/pom.xml
@@ -80,6 +80,13 @@
         </dependency>
 
         <dependency>
+            <groupId>com.github.fge</groupId>
+            <artifactId>json-patch</artifactId>
+            <version>1.9</version>
+            <scope>provided</scope>
+        </dependency>
+
+        <dependency>
           <groupId>com.fasterxml.jackson.core</groupId>
           <artifactId>jackson-core</artifactId>
           <scope>provided</scope>
diff --git a/services/src/main/java/org/apache/unomi/services/services/DefinitionsServiceImpl.java b/services/src/main/java/org/apache/unomi/services/services/DefinitionsServiceImpl.java
index eacd270..0daaf5b 100644
--- a/services/src/main/java/org/apache/unomi/services/services/DefinitionsServiceImpl.java
+++ b/services/src/main/java/org/apache/unomi/services/services/DefinitionsServiceImpl.java
@@ -17,6 +17,7 @@
 
 package org.apache.unomi.services.services;
 
+import org.apache.unomi.api.Persona;
 import org.apache.unomi.api.PluginType;
 import org.apache.unomi.api.PropertyMergeStrategyType;
 import org.apache.unomi.api.ValueType;
@@ -24,6 +25,7 @@
 import org.apache.unomi.api.conditions.Condition;
 import org.apache.unomi.api.conditions.ConditionType;
 import org.apache.unomi.api.services.DefinitionsService;
+import org.apache.unomi.api.services.PatchService;
 import org.apache.unomi.persistence.spi.CustomObjectMapper;
 import org.apache.unomi.persistence.spi.PersistenceService;
 import org.apache.unomi.persistence.spi.aggregate.BaseAggregate;
@@ -44,6 +46,7 @@
     private static final Logger logger = LoggerFactory.getLogger(DefinitionsServiceImpl.class.getName());
 
     private PersistenceService persistenceService;
+    private PatchService patchService;
 
     private Map<String, ConditionType> conditionTypeById = new ConcurrentHashMap<>();
     private Map<String, ActionType> actionTypeById = new ConcurrentHashMap<>();
@@ -65,6 +68,10 @@
         this.persistenceService = persistenceService;
     }
 
+    public void setPatchService(PatchService patchService) {
+        this.patchService = patchService;
+    }
+
     public void postConstruct() {
         logger.debug("postConstruct {" + bundleContext.getBundle() + "}");
 
@@ -126,21 +133,26 @@
             return;
         }
 
+        // First apply patches on existing items
+        patchService.patch(bundleContext.getBundle().findEntries("META-INF/cxs/conditions", "*-patch.json", true), ConditionType.class);
+
         while (predefinedConditionEntries.hasMoreElements()) {
             URL predefinedConditionURL = predefinedConditionEntries.nextElement();
-            logger.debug("Found predefined condition at " + predefinedConditionURL + ", loading... ");
+            if (!predefinedConditionURL.getFile().endsWith("-patch.json")) {
+                logger.debug("Found predefined condition at " + predefinedConditionURL + ", loading... ");
 
-            try {
-                ConditionType conditionType = CustomObjectMapper.getObjectMapper().readValue(predefinedConditionURL, ConditionType.class);
-                // Register only if condition type does not exist yet
-                if (getConditionType(conditionType.getMetadata().getId()) == null || bundleContext.getBundle().getVersion().toString().contains("SNAPSHOT")) {
-                    setConditionType(conditionType);
-                    logger.info("Predefined condition type with id {} registered", conditionType.getMetadata().getId());
-                } else {
-                    logger.info("The predefined condition type with id {} is already registered, this condition type will be skipped", conditionType.getMetadata().getId());
+                try {
+                    ConditionType conditionType = CustomObjectMapper.getObjectMapper().readValue(predefinedConditionURL, ConditionType.class);
+                    // Register only if condition type does not exist yet
+                    if (getConditionType(conditionType.getMetadata().getId()) == null) {
+                        setConditionType(conditionType);
+                        logger.info("Predefined condition type with id {} registered", conditionType.getMetadata().getId());
+                    } else {
+                        logger.info("The predefined condition type with id {} is already registered, this condition type will be skipped", conditionType.getMetadata().getId());
+                    }
+                } catch (IOException e) {
+                    logger.error("Error while loading condition definition " + predefinedConditionURL, e);
                 }
-            } catch (IOException e) {
-                logger.error("Error while loading condition definition " + predefinedConditionURL, e);
             }
         }
     }
@@ -150,22 +162,28 @@
         if (predefinedActionsEntries == null) {
             return;
         }
+
+        // First apply patches on existing items
+        patchService.patch(bundleContext.getBundle().findEntries("META-INF/cxs/actions", "*-patch.json", true), ActionType.class);
+
         ArrayList<PluginType> pluginTypeArrayList = (ArrayList<PluginType>) pluginTypes.get(bundleContext.getBundle().getBundleId());
         while (predefinedActionsEntries.hasMoreElements()) {
             URL predefinedActionURL = predefinedActionsEntries.nextElement();
-            logger.debug("Found predefined action at " + predefinedActionURL + ", loading... ");
+            if (!predefinedActionURL.getFile().endsWith("-patch.json")) {
+                logger.debug("Found predefined action at " + predefinedActionURL + ", loading... ");
 
-            try {
-                ActionType actionType = CustomObjectMapper.getObjectMapper().readValue(predefinedActionURL, ActionType.class);
-                // Register only if action type does not exist yet
-                if (getActionType(actionType.getMetadata().getId()) == null || bundleContext.getBundle().getVersion().toString().contains("SNAPSHOT")) {
-                    setActionType(actionType);
-                    logger.info("Predefined action type with id {} registered", actionType.getMetadata().getId());
-                } else {
-                    logger.info("The predefined action type with id {} is already registered, this action type will be skipped", actionType.getMetadata().getId());
+                try {
+                    ActionType actionType = CustomObjectMapper.getObjectMapper().readValue(predefinedActionURL, ActionType.class);
+                    // Register only if action type does not exist yet
+                    if (getActionType(actionType.getMetadata().getId()) == null) {
+                        setActionType(actionType);
+                        logger.info("Predefined action type with id {} registered", actionType.getMetadata().getId());
+                    } else {
+                        logger.info("The predefined action type with id {} is already registered, this action type will be skipped", actionType.getMetadata().getId());
+                    }
+                } catch (Exception e) {
+                    logger.error("Error while loading action definition " + predefinedActionURL, e);
                 }
-            } catch (Exception e) {
-                logger.error("Error while loading action definition " + predefinedActionURL, e);
             }
         }
 
diff --git a/services/src/main/java/org/apache/unomi/services/services/GoalsServiceImpl.java b/services/src/main/java/org/apache/unomi/services/services/GoalsServiceImpl.java
index 771e21f..0de6c64 100644
--- a/services/src/main/java/org/apache/unomi/services/services/GoalsServiceImpl.java
+++ b/services/src/main/java/org/apache/unomi/services/services/GoalsServiceImpl.java
@@ -30,6 +30,7 @@
 import org.apache.unomi.api.rules.Rule;
 import org.apache.unomi.api.services.DefinitionsService;
 import org.apache.unomi.api.services.GoalsService;
+import org.apache.unomi.api.services.PatchService;
 import org.apache.unomi.api.services.RulesService;
 import org.apache.unomi.persistence.spi.CustomObjectMapper;
 import org.apache.unomi.persistence.spi.PersistenceService;
@@ -57,6 +58,8 @@
 
     private RulesService rulesService;
 
+    private PatchService patchService;
+
     public void setBundleContext(BundleContext bundleContext) {
         this.bundleContext = bundleContext;
     }
@@ -73,6 +76,10 @@
         this.rulesService = rulesService;
     }
 
+    public void setPatchService(PatchService patchService) {
+        this.patchService = patchService;
+    }
+
     public void postConstruct() {
         logger.debug("postConstruct {" + bundleContext.getBundle() + "}");
 
@@ -109,24 +116,30 @@
         if (predefinedRuleEntries == null) {
             return;
         }
+
+        // First apply patches on existing items
+        patchService.patch(bundleContext.getBundle().findEntries("META-INF/cxs/goals", "*-patch.json", true), Goal.class);
+
         while (predefinedRuleEntries.hasMoreElements()) {
             URL predefinedGoalURL = predefinedRuleEntries.nextElement();
-            logger.debug("Found predefined goals at " + predefinedGoalURL + ", loading... ");
+            if (!predefinedGoalURL.getFile().endsWith("-patch.json")) {
+                logger.debug("Found predefined goals at " + predefinedGoalURL + ", loading... ");
 
-            try {
-                Goal goal = CustomObjectMapper.getObjectMapper().readValue(predefinedGoalURL, Goal.class);
-                if (goal.getMetadata().getScope() == null) {
-                    goal.getMetadata().setScope("systemscope");
+                try {
+                    Goal goal = CustomObjectMapper.getObjectMapper().readValue(predefinedGoalURL, Goal.class);
+                    if (goal.getMetadata().getScope() == null) {
+                        goal.getMetadata().setScope("systemscope");
+                    }
+                    // Register only if goal does not exist yet
+                    if (getGoal(goal.getMetadata().getId()) == null) {
+                        setGoal(goal);
+                        logger.info("Predefined goal with id {} registered", goal.getMetadata().getId());
+                    } else {
+                        logger.info("The predefined goal with id {} is already registered, this goal will be skipped", goal.getMetadata().getId());
+                    }
+                } catch (IOException e) {
+                    logger.error("Error while loading segment definition " + predefinedGoalURL, e);
                 }
-                // Register only if goal does not exist yet
-                if (getGoal(goal.getMetadata().getId()) == null || bundleContext.getBundle().getVersion().toString().contains("SNAPSHOT")) {
-                    setGoal(goal);
-                    logger.info("Predefined goal with id {} registered", goal.getMetadata().getId());
-                } else {
-                    logger.info("The predefined goal with id {} is already registered, this goal will be skipped", goal.getMetadata().getId());
-                }
-            } catch (IOException e) {
-                logger.error("Error while loading segment definition " + predefinedGoalURL, e);
             }
         }
     }
@@ -257,21 +270,27 @@
         if (predefinedRuleEntries == null) {
             return;
         }
+
+        // First apply patches on existing items
+        patchService.patch(bundleContext.getBundle().findEntries("META-INF/cxs/campaigns", "*-patch.json", true), Campaign.class);
+
         while (predefinedRuleEntries.hasMoreElements()) {
             URL predefinedCampaignURL = predefinedRuleEntries.nextElement();
-            logger.debug("Found predefined campaigns at " + predefinedCampaignURL + ", loading... ");
+            if (!predefinedCampaignURL.getFile().endsWith("-patch.json")) {
+                logger.debug("Found predefined campaigns at " + predefinedCampaignURL + ", loading... ");
 
-            try {
-                Campaign campaign = CustomObjectMapper.getObjectMapper().readValue(predefinedCampaignURL, Campaign.class);
-                // Register only if campaign does not exist yet
-                if (getCampaign(campaign.getMetadata().getId()) == null || bundleContext.getBundle().getVersion().toString().contains("SNAPSHOT")) {
-                    setCampaign(campaign);
-                    logger.info("Predefined campaign with id {} registered", campaign.getMetadata().getId());
-                } else {
-                    logger.info("The predefined campaign with id {} is already registered, this campaign will be skipped", campaign.getMetadata().getId());
+                try {
+                    Campaign campaign = CustomObjectMapper.getObjectMapper().readValue(predefinedCampaignURL, Campaign.class);
+                    // Register only if campaign does not exist yet
+                    if (getCampaign(campaign.getMetadata().getId()) == null) {
+                        setCampaign(campaign);
+                        logger.info("Predefined campaign with id {} registered", campaign.getMetadata().getId());
+                    } else {
+                        logger.info("The predefined campaign with id {} is already registered, this campaign will be skipped", campaign.getMetadata().getId());
+                    }
+                } catch (IOException e) {
+                    logger.error("Error while loading segment definition " + predefinedCampaignURL, e);
                 }
-            } catch (IOException e) {
-                logger.error("Error while loading segment definition " + predefinedCampaignURL, e);
             }
         }
     }
diff --git a/services/src/main/java/org/apache/unomi/services/services/PatchServiceImpl.java b/services/src/main/java/org/apache/unomi/services/services/PatchServiceImpl.java
new file mode 100644
index 0000000..c6a8b77
--- /dev/null
+++ b/services/src/main/java/org/apache/unomi/services/services/PatchServiceImpl.java
@@ -0,0 +1,116 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.unomi.services.services;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.github.fge.jsonpatch.JsonPatch;
+import com.github.fge.jsonpatch.JsonPatchException;
+import org.apache.unomi.api.Item;
+import org.apache.unomi.api.Patch;
+import org.apache.unomi.api.PropertyType;
+import org.apache.unomi.api.services.PatchService;
+import org.apache.unomi.persistence.spi.CustomObjectMapper;
+import org.apache.unomi.persistence.spi.PersistenceService;
+import org.osgi.framework.BundleContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.net.URL;
+import java.util.Date;
+import java.util.Enumeration;
+
+public class PatchServiceImpl implements PatchService {
+
+    private static final Logger logger = LoggerFactory.getLogger(ProfileServiceImpl.class.getName());
+
+    private BundleContext bundleContext;
+
+    private PersistenceService persistenceService;
+
+    public void setBundleContext(BundleContext bundleContext) {
+        this.bundleContext = bundleContext;
+    }
+
+    public void setPersistenceService(PersistenceService persistenceService) {
+        this.persistenceService = persistenceService;
+    }
+
+    @Override
+    public Patch load(String id) {
+        return persistenceService.load(id, Patch.class);
+    }
+
+    public void patch(Enumeration<URL> urls, Class<? extends Item> type) {
+        if (urls != null) {
+            while (urls.hasMoreElements()) {
+                patch(urls.nextElement(), type);
+            }
+        }
+    }
+
+    public  void patch(URL patchUrl, Class<? extends Item> type) {
+        try {
+            Patch patch = CustomObjectMapper.getObjectMapper().readValue(patchUrl, Patch.class);
+            if (persistenceService.load(patch.getItemId(), Patch.class) == null) {
+                patch(patch, type);
+            }
+        } catch (IOException e) {
+            logger.error("Error while loading patch " + patchUrl, e);
+        }
+    }
+
+    public <T extends Item> T patch(Patch patch, Class<T> type) {
+        if (type == null) {
+            throw new IllegalArgumentException("Must specify valid type");
+        }
+
+        T item = persistenceService.load(patch.getPatchedItemId(), type);
+
+        if (item != null && patch.getOperation() != null) {
+            logger.info("Applying patch " + patch.getItemId());
+
+            switch (patch.getOperation()) {
+                case "override":
+                    item = CustomObjectMapper.getObjectMapper().convertValue(patch.getData(), type);
+                    persistenceService.save(item);
+                    break;
+                case "patch":
+                    JsonNode node = CustomObjectMapper.getObjectMapper().valueToTree(item);
+                    JsonPatch jsonPatch = CustomObjectMapper.getObjectMapper().convertValue(patch.getData(), JsonPatch.class);
+                    try {
+                        JsonNode converted = jsonPatch.apply(node);
+                        item = CustomObjectMapper.getObjectMapper().convertValue(converted, type);
+                        persistenceService.save(item);
+                    } catch (JsonPatchException e) {
+                        logger.error("Cannot apply patch",e);
+                    }
+                    break;
+                case "remove":
+                    persistenceService.remove(patch.getPatchedItemId(), type);
+                    break;
+            }
+
+        }
+
+        patch.setLastApplication(new Date());
+        persistenceService.save(patch);
+
+        return item;
+    }
+
+}
diff --git a/services/src/main/java/org/apache/unomi/services/services/ProfileServiceImpl.java b/services/src/main/java/org/apache/unomi/services/services/ProfileServiceImpl.java
index 02f6f0c..57ebf94 100644
--- a/services/src/main/java/org/apache/unomi/services/services/ProfileServiceImpl.java
+++ b/services/src/main/java/org/apache/unomi/services/services/ProfileServiceImpl.java
@@ -17,6 +17,9 @@
 
 package org.apache.unomi.services.services;
 
+import com.fasterxml.jackson.databind.JsonNode;
+import com.github.fge.jsonpatch.JsonPatch;
+import com.github.fge.jsonpatch.JsonPatchException;
 import org.apache.commons.beanutils.BeanUtils;
 import org.apache.commons.beanutils.PropertyUtils;
 import org.apache.commons.lang3.StringUtils;
@@ -25,10 +28,7 @@
 import org.apache.unomi.api.conditions.ConditionType;
 import org.apache.unomi.api.query.Query;
 import org.apache.unomi.api.segments.Segment;
-import org.apache.unomi.api.services.DefinitionsService;
-import org.apache.unomi.api.services.ProfileService;
-import org.apache.unomi.api.services.QueryService;
-import org.apache.unomi.api.services.SegmentService;
+import org.apache.unomi.api.services.*;
 import org.apache.unomi.persistence.spi.CustomObjectMapper;
 import org.apache.unomi.persistence.spi.PersistenceService;
 import org.apache.unomi.persistence.spi.PropertyHelper;
@@ -42,6 +42,8 @@
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
+import static org.apache.unomi.persistence.spi.CustomObjectMapper.getObjectMapper;
+
 public class ProfileServiceImpl implements ProfileService, SynchronousBundleListener {
 
     /**
@@ -160,6 +162,8 @@
 
     private QueryService queryService;
 
+    private PatchService patchService;
+
     private Condition purgeProfileQuery;
     private Integer purgeProfileExistTime = 0;
     private Integer purgeProfileInactiveTime = 0;
@@ -194,6 +198,14 @@
         this.segmentService = segmentService;
     }
 
+    public void setQueryService(QueryService queryService) {
+        this.queryService = queryService;
+    }
+
+    public void setPatchService(PatchService patchService) {
+        this.patchService = patchService;
+    }
+
     public void setForceRefreshOnSave(boolean forceRefreshOnSave) {
         this.forceRefreshOnSave = forceRefreshOnSave;
     }
@@ -232,10 +244,6 @@
     private void processBundleStop(BundleContext bundleContext) {
     }
 
-    public void setQueryService(QueryService queryService) {
-        this.queryService = queryService;
-    }
-
     public void setPurgeProfileExistTime(Integer purgeProfileExistTime) {
         this.purgeProfileExistTime = purgeProfileExistTime;
     }
@@ -915,31 +923,35 @@
             return;
         }
 
+        // First apply patches on existing items
+        patchService.patch(bundleContext.getBundle().findEntries("META-INF/cxs/personas", "*-patch.json", true), Persona.class);
+
         while (predefinedPersonaEntries.hasMoreElements()) {
             URL predefinedPersonaURL = predefinedPersonaEntries.nextElement();
-            logger.debug("Found predefined persona at " + predefinedPersonaURL + ", loading... ");
+            if (!predefinedPersonaURL.getFile().endsWith("-patch.json")) {
+                logger.debug("Found predefined persona at " + predefinedPersonaURL + ", loading... ");
 
-            try {
-                PersonaWithSessions persona = CustomObjectMapper.getObjectMapper().readValue(predefinedPersonaURL, PersonaWithSessions.class);
+                try {
+                    PersonaWithSessions persona = getObjectMapper().readValue(predefinedPersonaURL, PersonaWithSessions.class);
 
-                String itemId = persona.getPersona().getItemId();
-                // Register only if persona does not exist yet
-                if (persistenceService.load(itemId, Persona.class) == null || bundleContext.getBundle().getVersion().toString().contains("SNAPSHOT")) {
-                    persistenceService.save(persona.getPersona());
+                    String itemId = persona.getPersona().getItemId();
+                    // Register only if persona does not exist yet
+                    if (persistenceService.load(itemId, Persona.class) == null) {
+                        persistenceService.save(persona.getPersona());
 
-                    List<PersonaSession> sessions = persona.getSessions();
-                    for (PersonaSession session : sessions) {
-                        session.setProfile(persona.getPersona());
-                        persistenceService.save(session);
+                        List<PersonaSession> sessions = persona.getSessions();
+                        for (PersonaSession session : sessions) {
+                            session.setProfile(persona.getPersona());
+                            persistenceService.save(session);
+                        }
+                        logger.info("Predefined persona with id {} registered", itemId);
+                    } else {
+                        logger.info("The predefined persona with id {} is already registered, this persona will be skipped", itemId);
                     }
-                    logger.info("Predefined persona with id {} registered", itemId);
-                } else {
-                    logger.info("The predefined persona with id {} is already registered, this persona will be skipped", itemId);
+                } catch (IOException e) {
+                    logger.error("Error while loading persona " + predefinedPersonaURL, e);
                 }
-            } catch (IOException e) {
-                logger.error("Error while loading persona " + predefinedPersonaURL, e);
             }
-
         }
     }
 
@@ -949,31 +961,38 @@
             return;
         }
 
+        // First apply patches on existing items
+
+        patchService.patch(bundleContext.getBundle().findEntries("META-INF/cxs/properties", "*-patch.json", true), PropertyType.class);
+
         List<PropertyType> bundlePropertyTypes = new ArrayList<>();
         while (predefinedPropertyTypeEntries.hasMoreElements()) {
             URL predefinedPropertyTypeURL = predefinedPropertyTypeEntries.nextElement();
-            logger.debug("Found predefined property type at " + predefinedPropertyTypeURL + ", loading... ");
+            if (!predefinedPropertyTypeURL.getFile().endsWith("-patch.json")) {
+                logger.debug("Found predefined property type at " + predefinedPropertyTypeURL + ", loading... ");
 
-            try {
-                PropertyType propertyType = CustomObjectMapper.getObjectMapper().readValue(predefinedPropertyTypeURL, PropertyType.class);
-                // Register only if property type does not exist yet
-                if (getPropertyType(propertyType.getMetadata().getId()) == null || bundleContext.getBundle().getVersion().toString().contains("SNAPSHOT")) {
+                try {
+                    PropertyType propertyType = CustomObjectMapper.getObjectMapper().readValue(predefinedPropertyTypeURL, PropertyType.class);
+                    // Register only if property type does not exist yet
+                    if (getPropertyType(propertyType.getMetadata().getId()) == null) {
 
-                    setPropertyTypeTarget(predefinedPropertyTypeURL, propertyType);
+                        setPropertyTypeTarget(predefinedPropertyTypeURL, propertyType);
 
-                    persistenceService.save(propertyType);
-                    bundlePropertyTypes.add(propertyType);
-                    logger.info("Predefined property type with id {} registered", propertyType.getMetadata().getId());
-                } else {
-                    logger.info("The predefined property type with id {} is already registered, this property type will be skipped", propertyType.getMetadata().getId());
+                        persistenceService.save(propertyType);
+                        bundlePropertyTypes.add(propertyType);
+                        logger.info("Predefined property type with id {} registered", propertyType.getMetadata().getId());
+                    } else {
+                        logger.info("The predefined property type with id {} is already registered, this property type will be skipped", propertyType.getMetadata().getId());
+                    }
+                } catch (IOException e) {
+                    logger.error("Error while loading properties " + predefinedPropertyTypeURL, e);
                 }
-            } catch (IOException e) {
-                logger.error("Error while loading properties " + predefinedPropertyTypeURL, e);
             }
         }
         propertyTypes = propertyTypes.with(bundlePropertyTypes);
     }
 
+
     public void bundleChanged(BundleEvent event) {
         switch (event.getType()) {
             case BundleEvent.STARTED:
diff --git a/services/src/main/java/org/apache/unomi/services/services/RulesServiceImpl.java b/services/src/main/java/org/apache/unomi/services/services/RulesServiceImpl.java
index 2bcf564..3f63a31 100644
--- a/services/src/main/java/org/apache/unomi/services/services/RulesServiceImpl.java
+++ b/services/src/main/java/org/apache/unomi/services/services/RulesServiceImpl.java
@@ -17,20 +17,14 @@
 
 package org.apache.unomi.services.services;
 
-import org.apache.unomi.api.Event;
-import org.apache.unomi.api.Item;
-import org.apache.unomi.api.Metadata;
-import org.apache.unomi.api.PartialList;
+import org.apache.unomi.api.*;
 import org.apache.unomi.api.actions.Action;
 import org.apache.unomi.api.actions.ActionExecutor;
 import org.apache.unomi.api.conditions.Condition;
 import org.apache.unomi.api.query.Query;
 import org.apache.unomi.api.rules.Rule;
 import org.apache.unomi.api.rules.RuleStatistics;
-import org.apache.unomi.api.services.DefinitionsService;
-import org.apache.unomi.api.services.EventListenerService;
-import org.apache.unomi.api.services.EventService;
-import org.apache.unomi.api.services.RulesService;
+import org.apache.unomi.api.services.*;
 import org.apache.unomi.persistence.spi.CustomObjectMapper;
 import org.apache.unomi.persistence.spi.PersistenceService;
 import org.apache.unomi.services.actions.ActionExecutorDispatcher;
@@ -55,6 +49,8 @@
 
     private EventService eventService;
 
+    private PatchService patchService;
+
     private ActionExecutorDispatcher actionExecutorDispatcher;
     private List<Rule> allRules;
 
@@ -83,6 +79,10 @@
         this.actionExecutorDispatcher = actionExecutorDispatcher;
     }
 
+    public void setPatchService(PatchService patchService) {
+        this.patchService = patchService;
+    }
+
     public void bindExecutor(ServiceReference<ActionExecutor> actionExecutorServiceReference) {
         ActionExecutor actionExecutor = bundleContext.getService(actionExecutorServiceReference);
         actionExecutorDispatcher.addExecutor(actionExecutorServiceReference.getProperty("actionExecutorId").toString(), actionExecutor);
@@ -146,23 +146,27 @@
             return;
         }
 
+        // First apply patches on existing items
+        patchService.patch(bundleContext.getBundle().findEntries("META-INF/cxs/rules", "*-patch.json", true), Rule.class);
+
         while (predefinedRuleEntries.hasMoreElements()) {
-            URL predefinedSegmentURL = predefinedRuleEntries.nextElement();
-            logger.debug("Found predefined rule at " + predefinedSegmentURL + ", loading... ");
+            URL predefinedRuleURL = predefinedRuleEntries.nextElement();
+            if (!predefinedRuleURL.getFile().endsWith("-patch.json")) {
+                logger.debug("Found predefined rule at " + predefinedRuleURL + ", loading... ");
 
-            try {
-                Rule rule = CustomObjectMapper.getObjectMapper().readValue(predefinedSegmentURL, Rule.class);
-                // Register only if rule does not exist yet
-                if (getRule(rule.getMetadata().getId()) == null || bundleContext.getBundle().getVersion().toString().contains("SNAPSHOT")) {
-                    setRule(rule);
-                    logger.info("Predefined rule with id {} registered", rule.getMetadata().getId());
-                } else {
-                    logger.info("The predefined rule with id {} is already registered, this rule will be skipped", rule.getMetadata().getId());
+                try {
+                    Rule rule = CustomObjectMapper.getObjectMapper().readValue(predefinedRuleURL, Rule.class);
+                    // Register only if rule does not exist yet
+                    if (getRule(rule.getMetadata().getId()) == null) {
+                        setRule(rule);
+                        logger.info("Predefined rule with id {} registered", rule.getMetadata().getId());
+                    } else {
+                        logger.info("The predefined rule with id {} is already registered, this rule will be skipped", rule.getMetadata().getId());
+                    }
+                } catch (IOException e) {
+                    logger.error("Error while loading rule definition " + predefinedRuleURL, e);
                 }
-            } catch (IOException e) {
-                logger.error("Error while loading segment definition " + predefinedSegmentURL, e);
             }
-
         }
     }
 
diff --git a/services/src/main/java/org/apache/unomi/services/services/SegmentServiceImpl.java b/services/src/main/java/org/apache/unomi/services/services/SegmentServiceImpl.java
index b1dfbb6..5b92a48 100644
--- a/services/src/main/java/org/apache/unomi/services/services/SegmentServiceImpl.java
+++ b/services/src/main/java/org/apache/unomi/services/services/SegmentServiceImpl.java
@@ -25,10 +25,7 @@
 import org.apache.unomi.api.query.Query;
 import org.apache.unomi.api.rules.Rule;
 import org.apache.unomi.api.segments.*;
-import org.apache.unomi.api.services.DefinitionsService;
-import org.apache.unomi.api.services.EventService;
-import org.apache.unomi.api.services.RulesService;
-import org.apache.unomi.api.services.SegmentService;
+import org.apache.unomi.api.services.*;
 import org.apache.unomi.persistence.spi.CustomObjectMapper;
 import org.apache.unomi.persistence.spi.PersistenceService;
 import org.apache.unomi.persistence.spi.aggregate.TermsAggregate;
@@ -54,6 +51,8 @@
 
     private RulesService rulesService;
 
+    private PatchService patchService;
+
     private long taskExecutionPeriod = 24L * 60L * 60L * 1000L;
     private List<Segment> allSegments;
     private List<Scoring> allScoring;
@@ -76,6 +75,10 @@
         this.rulesService = rulesService;
     }
 
+    public void setPatchService(PatchService patchService) {
+        this.patchService = patchService;
+    }
+
     public void setSegmentUpdateBatchSize(int segmentUpdateBatchSize) {
         this.segmentUpdateBatchSize = segmentUpdateBatchSize;
     }
@@ -127,24 +130,30 @@
         if (predefinedSegmentEntries == null) {
             return;
         }
+
+        // First apply patches on existing items
+        patchService.patch(bundleContext.getBundle().findEntries("META-INF/cxs/segments", "*-patch.json", true), Segment.class);
+
         while (predefinedSegmentEntries.hasMoreElements()) {
             URL predefinedSegmentURL = predefinedSegmentEntries.nextElement();
-            logger.debug("Found predefined segment at " + predefinedSegmentURL + ", loading... ");
+            if (!predefinedSegmentURL.getFile().endsWith("-patch.json")) {
+                logger.debug("Found predefined segment at " + predefinedSegmentURL + ", loading... ");
 
-            try {
-                Segment segment = CustomObjectMapper.getObjectMapper().readValue(predefinedSegmentURL, Segment.class);
-                if (segment.getMetadata().getScope() == null) {
-                    segment.getMetadata().setScope("systemscope");
+                try {
+                    Segment segment = CustomObjectMapper.getObjectMapper().readValue(predefinedSegmentURL, Segment.class);
+                    if (segment.getMetadata().getScope() == null) {
+                        segment.getMetadata().setScope("systemscope");
+                    }
+                    // Register only if segment does not exist yet
+                    if (getSegmentDefinition(segment.getMetadata().getId()) == null) {
+                        setSegmentDefinition(segment);
+                        logger.info("Predefined segment with id {} registered", segment.getMetadata().getId());
+                    } else {
+                        logger.info("The predefined segment with id {} is already registered, this segment will be skipped", segment.getMetadata().getId());
+                    }
+                } catch (IOException e) {
+                    logger.error("Error while loading segment definition " + predefinedSegmentURL, e);
                 }
-                // Register only if segment does not exist yet
-                if (getSegmentDefinition(segment.getMetadata().getId()) == null || bundleContext.getBundle().getVersion().toString().contains("SNAPSHOT")) {
-                    setSegmentDefinition(segment);
-                    logger.info("Predefined segment with id {} registered", segment.getMetadata().getId());
-                } else {
-                    logger.info("The predefined segment with id {} is already registered, this segment will be skipped", segment.getMetadata().getId());
-                }
-            } catch (IOException e) {
-                logger.error("Error while loading segment definition " + predefinedSegmentURL, e);
             }
         }
     }
@@ -154,24 +163,30 @@
         if (predefinedScoringEntries == null) {
             return;
         }
+
+        // First apply patches on existing items
+        patchService.patch(bundleContext.getBundle().findEntries("META-INF/cxs/scoring", "*-patch.json", true), Scoring.class);
+
         while (predefinedScoringEntries.hasMoreElements()) {
             URL predefinedScoringURL = predefinedScoringEntries.nextElement();
-            logger.debug("Found predefined scoring at " + predefinedScoringURL + ", loading... ");
+            if (!predefinedScoringURL.getFile().endsWith("-patch.json")) {
+                logger.debug("Found predefined scoring at " + predefinedScoringURL + ", loading... ");
 
-            try {
-                Scoring scoring = CustomObjectMapper.getObjectMapper().readValue(predefinedScoringURL, Scoring.class);
-                if (scoring.getMetadata().getScope() == null) {
-                    scoring.getMetadata().setScope("systemscope");
+                try {
+                    Scoring scoring = CustomObjectMapper.getObjectMapper().readValue(predefinedScoringURL, Scoring.class);
+                    if (scoring.getMetadata().getScope() == null) {
+                        scoring.getMetadata().setScope("systemscope");
+                    }
+                    // Register only if scoring plan does not exist yet
+                    if (getScoringDefinition(scoring.getMetadata().getId()) == null) {
+                        setScoringDefinition(scoring);
+                        logger.info("Predefined scoring with id {} registered", scoring.getMetadata().getId());
+                    } else {
+                        logger.info("The predefined scoring with id {} is already registered, this scoring will be skipped", scoring.getMetadata().getId());
+                    }
+                } catch (IOException e) {
+                    logger.error("Error while loading segment definition " + predefinedScoringURL, e);
                 }
-                // Register only if scoring plan does not exist yet
-                if (getScoringDefinition(scoring.getMetadata().getId()) == null || bundleContext.getBundle().getVersion().toString().contains("SNAPSHOT")) {
-                    setScoringDefinition(scoring);
-                    logger.info("Predefined scoring with id {} registered", scoring.getMetadata().getId());
-                } else {
-                    logger.info("The predefined scoring with id {} is already registered, this scoring will be skipped", scoring.getMetadata().getId());
-                }
-            } catch (IOException e) {
-                logger.error("Error while loading segment definition " + predefinedScoringURL, e);
             }
         }
     }
diff --git a/services/src/main/resources/OSGI-INF/blueprint/blueprint.xml b/services/src/main/resources/OSGI-INF/blueprint/blueprint.xml
index 2e1ee27..438c7d0 100644
--- a/services/src/main/resources/OSGI-INF/blueprint/blueprint.xml
+++ b/services/src/main/resources/OSGI-INF/blueprint/blueprint.xml
@@ -58,6 +58,7 @@
     <bean id="definitionsServiceImpl" class="org.apache.unomi.services.services.DefinitionsServiceImpl"
           init-method="postConstruct" destroy-method="preDestroy">
         <property name="persistenceService" ref="persistenceService"/>
+        <property name="patchService" ref="patchServiceImpl"/>
         <property name="bundleContext" ref="blueprintBundleContext"/>
     </bean>
     <service id="definitionsService" ref="definitionsServiceImpl">
@@ -100,6 +101,7 @@
           init-method="postConstruct" destroy-method="preDestroy">
         <property name="persistenceService" ref="persistenceService"/>
         <property name="definitionsService" ref="definitionsServiceImpl"/>
+        <property name="patchService" ref="patchServiceImpl"/>
         <property name="rulesService" ref="rulesServiceImpl"/>
         <property name="bundleContext" ref="blueprintBundleContext"/>
     </bean>
@@ -120,6 +122,7 @@
         <property name="persistenceService" ref="persistenceService"/>
         <property name="definitionsService" ref="definitionsServiceImpl"/>
         <property name="eventService" ref="eventServiceImpl"/>
+        <property name="patchService" ref="patchServiceImpl"/>
         <property name="actionExecutorDispatcher" ref="actionExecutorDispatcherImpl"/>
         <property name="bundleContext" ref="blueprintBundleContext"/>
     </bean>
@@ -137,6 +140,7 @@
         <property name="definitionsService" ref="definitionsServiceImpl"/>
         <property name="eventService" ref="eventServiceImpl"/>
         <property name="rulesService" ref="rulesServiceImpl"/>
+        <property name="patchService" ref="patchServiceImpl"/>
         <property name="bundleContext" ref="blueprintBundleContext"/>
         <property name="taskExecutionPeriod" value="86400000"/>
         <property name="segmentUpdateBatchSize" value="${services.segment.update.batchSize}" />
@@ -167,6 +171,7 @@
         <property name="definitionsService" ref="definitionsServiceImpl"/>
         <property name="segmentService" ref="segmentServiceImpl"/>
         <property name="queryService" ref="queryServiceImpl"/>
+        <property name="patchService" ref="patchServiceImpl"/>
         <property name="bundleContext" ref="blueprintBundleContext"/>
         <property name="purgeProfileInterval" value="${services.profile.purge.interval}"/>
         <property name="purgeProfileInactiveTime" value="${services.profile.purge.inactiveTime}"/>
@@ -209,6 +214,17 @@
     </bean>
     <service id="personalizationService" ref="personalizationServiceImpl" interface="org.apache.unomi.api.services.PersonalizationService" />
 
+    <bean id="patchServiceImpl" class="org.apache.unomi.services.services.PatchServiceImpl">
+        <property name="persistenceService" ref="persistenceService"/>
+        <property name="bundleContext" ref="blueprintBundleContext"/>
+    </bean>
+    <service id="patchService" ref="patchServiceImpl">
+        <interfaces>
+            <value>org.apache.unomi.api.services.PatchService</value>
+        </interfaces>
+    </service>
+
+
     <!-- We use a listener here because using the list directly for listening to proxies coming from the same bundle didn't seem to work -->
     <reference-list id="eventListenerServices"
                     interface="org.apache.unomi.api.services.EventListenerService"
diff --git a/tools/shell-dev-commands/src/main/java/org/apache/unomi/shell/commands/DeployDefinition.java b/tools/shell-dev-commands/src/main/java/org/apache/unomi/shell/commands/DeployDefinition.java
deleted file mode 100644
index e4cbd7f..0000000
--- a/tools/shell-dev-commands/src/main/java/org/apache/unomi/shell/commands/DeployDefinition.java
+++ /dev/null
@@ -1,221 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.unomi.shell.commands;
-
-import org.apache.commons.lang3.StringUtils;
-import org.apache.felix.service.command.CommandSession;
-import org.apache.karaf.shell.commands.Argument;
-import org.apache.karaf.shell.commands.Command;
-import org.apache.karaf.shell.console.OsgiCommandSupport;
-import org.apache.unomi.api.Persona;
-import org.apache.unomi.api.PersonaWithSessions;
-import org.apache.unomi.api.PropertyType;
-import org.apache.unomi.api.actions.ActionType;
-import org.apache.unomi.api.campaigns.Campaign;
-import org.apache.unomi.api.conditions.ConditionType;
-import org.apache.unomi.api.goals.Goal;
-import org.apache.unomi.api.rules.Rule;
-import org.apache.unomi.api.segments.Scoring;
-import org.apache.unomi.api.segments.Segment;
-import org.apache.unomi.api.services.*;
-import org.apache.unomi.persistence.spi.CustomObjectMapper;
-import org.jline.reader.LineReader;
-import org.osgi.framework.Bundle;
-
-import java.io.IOException;
-import java.net.URL;
-import java.util.Arrays;
-import java.util.Enumeration;
-import java.util.List;
-
-@Command(scope = "unomi", name = "deploy-definition", description = "This will deploy a specific definition")
-public class DeployDefinition extends OsgiCommandSupport {
-
-    private DefinitionsService definitionsService;
-    private GoalsService goalsService;
-    private ProfileService profileService;
-    private RulesService rulesService;
-    private SegmentService segmentService;
-
-    private List<String> definitionTypes = Arrays.asList("condition", "action", "goal", "campaign", "persona", "persona with sessions", "property", "rule", "segment", "scoring");
-
-    @Argument(index = 0, name = "bundleId", description = "The bundle identifier where to find the definition", required = true, multiValued = false)
-    Long bundleIdentifier;
-
-    @Argument(index = 1, name = "fileName", description = "The name of the file which contains the definition, without its extension (e.g: firstName)", required = true, multiValued = false)
-    String fileName;
-
-    protected Object doExecute() throws Exception {
-        Bundle bundleToUpdate = bundleContext.getBundle(bundleIdentifier);
-        if (bundleToUpdate == null) {
-            System.out.println("Couldn't find a bundle with id: " + bundleIdentifier);
-            return null;
-        }
-
-        String definitionTypeAnswer = askUserWithAuthorizedAnswer(session,"Which kind of definition do you want to load?" + getDefinitionTypesWithNumber() + "\n", Arrays.asList("0", "1", "2", "3", "4", "5", "6", "7", "8", "9"));
-        String definitionType = definitionTypes.get(new Integer(definitionTypeAnswer));
-
-        String path = getDefinitionTypePath(definitionType);
-        Enumeration<URL> definitions = bundleToUpdate.findEntries(path, "*.json", true);
-        if (definitions == null) {
-            System.out.println("Couldn't find definitions in bundle with id: " + bundleIdentifier + " and definition path: " + path);
-            return null;
-        }
-
-        while (definitions.hasMoreElements()) {
-            URL definitionURL = definitions.nextElement();
-            if (definitionURL.toString().contains(fileName)) {
-                System.out.println("Found definition at " + definitionURL + ", loading... ");
-
-                updateDefinition(definitionType, definitionURL);
-            }
-        }
-
-        return null;
-    }
-
-    private String askUserWithAuthorizedAnswer(CommandSession session, String msg, List<String> authorizedAnswer) throws IOException {
-        String answer;
-        do {
-            answer = promptMessageToUser(session,msg);
-        } while (!authorizedAnswer.contains(answer.toLowerCase()));
-        return answer;
-    }
-
-    private String promptMessageToUser(CommandSession session, String msg) throws IOException {
-        LineReader reader = (LineReader) session.get(".jline.reader");
-        return reader.readLine(msg, null);
-    }
-
-    private String getDefinitionTypesWithNumber() {
-        StringBuilder definitionTypesWithNumber = new StringBuilder();
-        for (int i = 0; i < definitionTypes.size(); i++) {
-            definitionTypesWithNumber.append("\n").append(i).append(". ").append(definitionTypes.get(i));
-        }
-        return definitionTypesWithNumber.toString();
-    }
-
-    private void updateDefinition(String definitionType, URL definitionURL) {
-        try {
-            switch (definitionType) {
-                case "condition":
-                    ConditionType conditionType = CustomObjectMapper.getObjectMapper().readValue(definitionURL, ConditionType.class);
-                    definitionsService.setConditionType(conditionType);
-                    break;
-                case "action":
-                    ActionType actionType = CustomObjectMapper.getObjectMapper().readValue(definitionURL, ActionType.class);
-                    definitionsService.setActionType(actionType);
-                    break;
-                case "goal":
-                    Goal goal = CustomObjectMapper.getObjectMapper().readValue(definitionURL, Goal.class);
-                    goalsService.setGoal(goal);
-                    break;
-                case "campaign":
-                    Campaign campaign = CustomObjectMapper.getObjectMapper().readValue(definitionURL, Campaign.class);
-                    goalsService.setCampaign(campaign);
-                    break;
-                case "persona":
-                    Persona persona = CustomObjectMapper.getObjectMapper().readValue(definitionURL, Persona.class);
-                    profileService.savePersona(persona);
-                    break;
-                case "persona with session":
-                    PersonaWithSessions personaWithSessions = CustomObjectMapper.getObjectMapper().readValue(definitionURL, PersonaWithSessions.class);
-                    profileService.savePersonaWithSessions(personaWithSessions);
-                    break;
-                case "property":
-                    PropertyType propertyType = CustomObjectMapper.getObjectMapper().readValue(definitionURL, PropertyType.class);
-                    profileService.setPropertyTypeTarget(definitionURL, propertyType);
-                    profileService.setPropertyType(propertyType);
-                    break;
-                case "rule":
-                    Rule rule = CustomObjectMapper.getObjectMapper().readValue(definitionURL, Rule.class);
-                    rulesService.setRule(rule);
-                    break;
-                case "segment":
-                    Segment segment = CustomObjectMapper.getObjectMapper().readValue(definitionURL, Segment.class);
-                    segmentService.setSegmentDefinition(segment);
-                    break;
-                case "scoring":
-                    Scoring scoring = CustomObjectMapper.getObjectMapper().readValue(definitionURL, Scoring.class);
-                    segmentService.setScoringDefinition(scoring);
-                    break;
-            }
-            System.out.println("Predefined definition registered");
-        } catch (IOException e) {
-            System.out.println("Error while saving definition " + definitionURL);
-            System.out.println(e.getMessage());
-        }
-    }
-
-    private String getDefinitionTypePath(String definitionType) {
-        StringBuilder path = new StringBuilder("META-INF/cxs/");
-        switch (definitionType) {
-            case "condition":
-                path.append("conditions");
-                break;
-            case "action":
-                path.append("actions");
-                break;
-            case "goal":
-                path.append("goals");
-                break;
-            case "campaign":
-                path.append("campaigns");
-                break;
-            case "persona":
-                path.append("personas");
-                break;
-            case "persona with session":
-                path.append("personas");
-                break;
-            case "property":
-                path.append("properties");
-                break;
-            case "rule":
-                path.append("rules");
-                break;
-            case "segment":
-                path.append("segments");
-                break;
-            case "scoring":
-                path.append("scoring");
-                break;
-        }
-
-        return path.toString();
-    }
-
-    public void setDefinitionsService(DefinitionsService definitionsService) {
-        this.definitionsService = definitionsService;
-    }
-
-    public void setGoalsService(GoalsService goalsService) {
-        this.goalsService = goalsService;
-    }
-
-    public void setProfileService(ProfileService profileService) {
-        this.profileService = profileService;
-    }
-
-    public void setRulesService(RulesService rulesService) {
-        this.rulesService = rulesService;
-    }
-
-    public void setSegmentService(SegmentService segmentService) {
-        this.segmentService = segmentService;
-    }
-}
diff --git a/tools/shell-dev-commands/src/main/java/org/apache/unomi/shell/commands/DeployDefinitionCommand.java b/tools/shell-dev-commands/src/main/java/org/apache/unomi/shell/commands/DeployDefinitionCommand.java
new file mode 100644
index 0000000..587ec7f
--- /dev/null
+++ b/tools/shell-dev-commands/src/main/java/org/apache/unomi/shell/commands/DeployDefinitionCommand.java
@@ -0,0 +1,297 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.unomi.shell.commands;
+
+import org.apache.commons.lang3.StringUtils;
+import org.apache.felix.service.command.CommandSession;
+import org.apache.karaf.shell.commands.Argument;
+import org.apache.karaf.shell.commands.Command;
+import org.apache.karaf.shell.console.OsgiCommandSupport;
+import org.apache.unomi.api.*;
+import org.apache.unomi.api.actions.ActionType;
+import org.apache.unomi.api.campaigns.Campaign;
+import org.apache.unomi.api.conditions.Condition;
+import org.apache.unomi.api.conditions.ConditionType;
+import org.apache.unomi.api.goals.Goal;
+import org.apache.unomi.api.rules.Rule;
+import org.apache.unomi.api.segments.Scoring;
+import org.apache.unomi.api.segments.Segment;
+import org.apache.unomi.api.services.*;
+import org.apache.unomi.persistence.spi.CustomObjectMapper;
+import org.jline.reader.LineReader;
+import org.osgi.framework.Bundle;
+
+import java.io.IOException;
+import java.net.URL;
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+@Command(scope = "unomi", name = "deploy-definition", description = "This will deploy a specific definition")
+public class DeployDefinitionCommand extends OsgiCommandSupport {
+
+    private DefinitionsService definitionsService;
+    private GoalsService goalsService;
+    private ProfileService profileService;
+    private RulesService rulesService;
+    private SegmentService segmentService;
+    private PatchService patchService;
+
+    private final static List<String> definitionTypes = Arrays.asList("condition", "action", "goal", "campaign", "persona", "property", "rule", "segment", "scoring");
+
+
+    @Argument(index = 0, name = "bundleId", description = "The bundle identifier where to find the definition", multiValued = false)
+    Long bundleIdentifier;
+
+    @Argument(index = 1, name = "type", description = "The kind of definitions you want to load (e.g.: condition, action, ..)", required = false, multiValued = false)
+    String definitionType;
+
+    @Argument(index = 2, name = "fileName", description = "The name of the file which contains the definition, without its extension (e.g: firstName)", required = false, multiValued = false)
+    String fileName;
+
+    protected Object doExecute() throws Exception {
+        Bundle bundleToUpdate;
+        if (bundleIdentifier == null) {
+            List<Bundle> bundles = new ArrayList<>();
+            for (Bundle bundle : bundleContext.getBundles()) {
+                if (bundle.findEntries("META-INF/cxs/", "*.json", true) != null) {
+                    bundles.add(bundle);
+                }
+            }
+
+            String bundleAnswer = askUserWithAuthorizedAnswer(session, "Which bundle ?" + getValuesWithNumber(bundles.stream().map(Bundle::getSymbolicName).collect(Collectors.toList())) + "\n",
+                    IntStream.range(1,bundles.size()+1).mapToObj(Integer::toString).collect(Collectors.toList()));
+            bundleToUpdate = bundles.get(new Integer(bundleAnswer)-1);
+            bundleIdentifier = bundleToUpdate.getBundleId();
+        } else {
+            bundleToUpdate = bundleContext.getBundle(bundleIdentifier);
+        }
+
+        if (bundleToUpdate == null) {
+            System.out.println("Couldn't find a bundle with id: " + bundleIdentifier);
+            return null;
+        }
+
+
+        if (definitionType == null) {
+            List<String> values = definitionTypes.stream().filter((t) -> bundleToUpdate.findEntries(getDefinitionTypePath(t), "*.json", true) != null).collect(Collectors.toList());
+            String definitionTypeAnswer = askUserWithAuthorizedAnswer(session, "Which kind of definition do you want to load?" + getValuesWithNumber(values) + "\n",
+                    IntStream.range(1,values.size()+1).mapToObj(Integer::toString).collect(Collectors.toList()));
+            definitionType = values.get(new Integer(definitionTypeAnswer)-1);
+        }
+
+        if (!definitionTypes.contains(definitionType)) {
+            System.out.println("Invalid type '" + definitionType + "' , allowed values : " +definitionTypes);
+            return null;
+        }
+
+        String path = getDefinitionTypePath(definitionType);
+        Enumeration<URL> definitions = bundleToUpdate.findEntries(path, "*.json", true);
+        if (definitions == null) {
+            System.out.println("Couldn't find definitions in bundle with id: " + bundleIdentifier + " and definition path: " + path);
+            return null;
+        }
+
+        List<URL> values = new ArrayList<>();
+        while (definitions.hasMoreElements()) {
+            values.add(definitions.nextElement());
+        }
+        if (fileName == null) {
+            List<String> stringList = values.stream().map(u -> StringUtils.substringAfterLast(u.getFile(), "/")).collect(Collectors.toList());
+            Collections.sort(stringList);
+            stringList.add(0, "* (All)");
+            String fileNameAnswer = askUserWithAuthorizedAnswer(session, "Which file do you want to load ?" + getValuesWithNumber(stringList) + "\n",
+                    IntStream.range(1,stringList.size()+1).mapToObj(Integer::toString).collect(Collectors.toList()));
+            fileName = stringList.get(new Integer(fileNameAnswer)-1);
+        }
+        if (fileName.startsWith("*")) {
+            for (URL url : values) {
+                if (!url.getFile().endsWith("-patch.json")) {
+                    updateDefinition(definitionType, url);
+                }
+            }
+        } else {
+            if (!fileName.contains("/")) {
+                fileName = "/" + fileName;
+            }
+            if (!fileName.endsWith(".json")) {
+                fileName += ".json";
+            }
+
+            Optional<URL> optionalURL = values.stream().filter(u -> u.getFile().endsWith(fileName)).findFirst();
+            if (optionalURL.isPresent()) {
+                URL url = optionalURL.get();
+                if (!url.getFile().endsWith("-patch.json")) {
+                    updateDefinition(definitionType, url);
+                } else {
+                    deployPatch(definitionType, url);
+                }
+            } else {
+                System.out.println("Couldn't find file " + fileName);
+                return null;
+            }
+        }
+
+        return null;
+    }
+
+    private String askUserWithAuthorizedAnswer(CommandSession session, String msg, List<String> authorizedAnswer) throws IOException {
+        String answer;
+        do {
+            answer = promptMessageToUser(session,msg);
+        } while (!authorizedAnswer.contains(answer.toLowerCase()));
+        return answer;
+    }
+
+    private String promptMessageToUser(CommandSession session, String msg) throws IOException {
+        LineReader reader = (LineReader) session.get(".jline.reader");
+        return reader.readLine(msg, null);
+    }
+
+    private String getValuesWithNumber(List<String> values) {
+        StringBuilder definitionTypesWithNumber = new StringBuilder();
+        for (int i = 0; i < values.size(); i++) {
+            definitionTypesWithNumber.append("\n").append(i+1).append(". ").append(values.get(i));
+        }
+        return definitionTypesWithNumber.toString();
+    }
+
+    private void updateDefinition(String definitionType, URL definitionURL) {
+        try {
+                    
+            switch (definitionType) {
+                case "condition":
+                    ConditionType conditionType = CustomObjectMapper.getObjectMapper().readValue(definitionURL, ConditionType.class);
+                    definitionsService.setConditionType(conditionType);
+                    break;
+                case "action":
+                    ActionType actionType = CustomObjectMapper.getObjectMapper().readValue(definitionURL, ActionType.class);
+                    definitionsService.setActionType(actionType);
+                    break;
+                case "goal":
+                    Goal goal = CustomObjectMapper.getObjectMapper().readValue(definitionURL, Goal.class);
+                    goalsService.setGoal(goal);
+                    break;
+                case "campaign":
+                    Campaign campaign = CustomObjectMapper.getObjectMapper().readValue(definitionURL, Campaign.class);
+                    goalsService.setCampaign(campaign);
+                    break;
+                case "persona":
+                    PersonaWithSessions persona = CustomObjectMapper.getObjectMapper().readValue(definitionURL, PersonaWithSessions.class);
+                    profileService.savePersonaWithSessions(persona);
+                    break;
+                case "property":
+                    PropertyType propertyType = CustomObjectMapper.getObjectMapper().readValue(definitionURL, PropertyType.class);
+                    profileService.setPropertyTypeTarget(definitionURL, propertyType);
+                    profileService.setPropertyType(propertyType);
+                    break;
+                case "rule":
+                    Rule rule = CustomObjectMapper.getObjectMapper().readValue(definitionURL, Rule.class);
+                    rulesService.setRule(rule);
+                    break;
+                case "segment":
+                    Segment segment = CustomObjectMapper.getObjectMapper().readValue(definitionURL, Segment.class);
+                    segmentService.setSegmentDefinition(segment);
+                    break;
+                case "scoring":
+                    Scoring scoring = CustomObjectMapper.getObjectMapper().readValue(definitionURL, Scoring.class);
+                    segmentService.setScoringDefinition(scoring);
+                    break;
+            }
+            System.out.println("Predefined definition registered : "+definitionURL.getFile());
+        } catch (IOException e) {
+            System.out.println("Error while saving definition " + definitionURL);
+            System.out.println(e.getMessage());
+        }
+    }
+
+    private void deployPatch(String definitionType, URL patchURL) {
+        try {
+            Patch patch = CustomObjectMapper.getObjectMapper().readValue(patchURL, Patch.class);
+            Class<? extends Item> type = Patch.PATCHABLE_TYPES.get(definitionType);
+            if (type != null) {
+                patchService.patch(patch, type);
+            }
+
+            System.out.println("Definition patched : "+ patch.getItemId() + " by : " + patchURL.getFile());
+        } catch (IOException e) {
+            System.out.println("Error while saving definition " + patchURL);
+            System.out.println(e.getMessage());
+        }
+    }
+
+
+
+    private String getDefinitionTypePath(String definitionType) {
+        StringBuilder path = new StringBuilder("META-INF/cxs/");
+        switch (definitionType) {
+            case "condition":
+                path.append("conditions");
+                break;
+            case "action":
+                path.append("actions");
+                break;
+            case "goal":
+                path.append("goals");
+                break;
+            case "campaign":
+                path.append("campaigns");
+                break;
+            case "persona":
+                path.append("personas");
+                break;
+            case "property":
+                path.append("properties");
+                break;
+            case "rule":
+                path.append("rules");
+                break;
+            case "segment":
+                path.append("segments");
+                break;
+            case "scoring":
+                path.append("scoring");
+                break;
+        }
+
+        return path.toString();
+    }
+
+    public void setDefinitionsService(DefinitionsService definitionsService) {
+        this.definitionsService = definitionsService;
+    }
+
+    public void setGoalsService(GoalsService goalsService) {
+        this.goalsService = goalsService;
+    }
+
+    public void setProfileService(ProfileService profileService) {
+        this.profileService = profileService;
+    }
+
+    public void setRulesService(RulesService rulesService) {
+        this.rulesService = rulesService;
+    }
+
+    public void setSegmentService(SegmentService segmentService) {
+        this.segmentService = segmentService;
+    }
+
+    public void setPatchService(PatchService patchService) {
+        this.patchService = patchService;
+    }
+}
diff --git a/tools/shell-dev-commands/src/main/resources/OSGI-INF/blueprint/blueprint.xml b/tools/shell-dev-commands/src/main/resources/OSGI-INF/blueprint/blueprint.xml
index 8fb4530..8144a21 100644
--- a/tools/shell-dev-commands/src/main/resources/OSGI-INF/blueprint/blueprint.xml
+++ b/tools/shell-dev-commands/src/main/resources/OSGI-INF/blueprint/blueprint.xml
@@ -30,6 +30,7 @@
     <reference id="clusterService" interface="org.apache.unomi.api.services.ClusterService"/>
     <reference id="queryService" interface="org.apache.unomi.api.services.QueryService"/>
     <reference id="eventService" interface="org.apache.unomi.api.services.EventService"/>
+    <reference id="patchService" interface="org.apache.unomi.api.services.PatchService"/>
 
     <shell:command-bundle>
         <shell:command>
@@ -68,12 +69,13 @@
             </shell:action>
         </shell:command>
         <shell:command>
-            <shell:action class="org.apache.unomi.shell.commands.DeployDefinition">
+            <shell:action class="org.apache.unomi.shell.commands.DeployDefinitionCommand">
                 <shell:property name="definitionsService" ref="definitionsService" />
                 <shell:property name="goalsService" ref="goalsService" />
                 <shell:property name="profileService" ref="profileService" />
                 <shell:property name="rulesService" ref="rulesService" />
                 <shell:property name="segmentService" ref="segmentService" />
+                <shell:property name="patchService" ref="patchService" />
             </shell:action>
         </shell:command>
         <shell:command>