| /* |
| * 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.*; |
| 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.Bundle; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.BundleEvent; |
| import org.osgi.framework.SynchronousBundleListener; |
| 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, SynchronousBundleListener { |
| |
| private static final Logger logger = LoggerFactory.getLogger(PatchServiceImpl.class.getName()); |
| |
| private BundleContext bundleContext; |
| |
| private PersistenceService persistenceService; |
| |
| public void setBundleContext(BundleContext bundleContext) { |
| this.bundleContext = bundleContext; |
| } |
| |
| public void setPersistenceService(PersistenceService persistenceService) { |
| this.persistenceService = persistenceService; |
| } |
| |
| public void postConstruct() { |
| logger.debug("postConstruct {" + bundleContext.getBundle() + "}"); |
| |
| processBundleStartup(bundleContext); |
| for (Bundle bundle : bundleContext.getBundles()) { |
| if (bundle.getBundleContext() != null && bundle.getBundleId() != bundleContext.getBundle().getBundleId()) { |
| processBundleStartup(bundle.getBundleContext()); |
| } |
| } |
| bundleContext.addBundleListener(this); |
| logger.info("Patch service initialized."); |
| } |
| |
| public void preDestroy() { |
| bundleContext.removeBundleListener(this); |
| logger.info("Patch service shutdown."); |
| } |
| |
| @Override |
| public void bundleChanged(BundleEvent event) { |
| switch (event.getType()) { |
| case BundleEvent.STARTED: |
| processBundleStartup(event.getBundle().getBundleContext()); |
| break; |
| } |
| } |
| |
| private void processBundleStartup(BundleContext bundleContext) { |
| if (bundleContext == null) { |
| return; |
| } |
| loadPredefinedPatches(bundleContext); |
| } |
| |
| private void loadPredefinedPatches(BundleContext bundleContext) { |
| if (bundleContext == null) { |
| return; |
| } |
| |
| // First apply patches on existing items |
| Enumeration<URL> urls = bundleContext.getBundle().findEntries("META-INF/cxs/patches", "*.json", true); |
| if (urls != null) { |
| while (urls.hasMoreElements()) { |
| URL patchUrl = urls.nextElement(); |
| try { |
| Patch patch = CustomObjectMapper.getObjectMapper().readValue(patchUrl, Patch.class); |
| if (persistenceService.load(patch.getItemId(), Patch.class) == null) { |
| patch(patch); |
| } |
| } catch (IOException e) { |
| logger.error("Error while loading patch " + patchUrl, e); |
| } |
| } |
| } |
| } |
| |
| @Override |
| public Patch load(String id) { |
| return persistenceService.load(id, Patch.class); |
| } |
| |
| public Item patch(Patch patch) { |
| Class<? extends Item> type = Patch.PATCHABLE_TYPES.get(patch.getPatchedItemType()); |
| |
| if (type == null) { |
| throw new IllegalArgumentException("Must specify valid type"); |
| } |
| |
| Item 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; |
| } |
| |
| } |