Merge branch 'apache-master' into 2.7.17-release
diff --git a/dubbo-registry/dubbo-registry-nacos/src/main/java/org/apache/dubbo/registry/nacos/NacosAggregateListener.java b/dubbo-registry/dubbo-registry-nacos/src/main/java/org/apache/dubbo/registry/nacos/NacosAggregateListener.java
new file mode 100644
index 0000000..5593acd
--- /dev/null
+++ b/dubbo-registry/dubbo-registry-nacos/src/main/java/org/apache/dubbo/registry/nacos/NacosAggregateListener.java
@@ -0,0 +1,70 @@
+/*
+ * 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.dubbo.registry.nacos;
+
+import org.apache.dubbo.common.utils.ConcurrentHashSet;
+import org.apache.dubbo.registry.NotifyListener;
+
+import com.alibaba.nacos.api.naming.pojo.Instance;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.stream.Collectors;
+
+public class NacosAggregateListener {
+    private final NotifyListener notifyListener;
+    private final Set<String> serviceNames = new ConcurrentHashSet<>();
+    private final Map<String, List<Instance>> serviceInstances = new ConcurrentHashMap<>();
+
+    public NacosAggregateListener(NotifyListener notifyListener) {
+        this.notifyListener = notifyListener;
+    }
+
+    public List<Instance> saveAndAggregateAllInstances(String serviceName, List<Instance> instances) {
+        serviceNames.add(serviceName);
+        serviceInstances.put(serviceName, instances);
+        return serviceInstances.values().stream().flatMap(List::stream).collect(Collectors.toList());
+    }
+
+    public NotifyListener getNotifyListener() {
+        return notifyListener;
+    }
+
+    public Set<String> getServiceNames() {
+        return serviceNames;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        NacosAggregateListener that = (NacosAggregateListener) o;
+        return Objects.equals(notifyListener, that.notifyListener) && Objects.equals(serviceNames, that.serviceNames) && Objects.equals(serviceInstances, that.serviceInstances);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(notifyListener, serviceNames, serviceInstances);
+    }
+}
diff --git a/dubbo-registry/dubbo-registry-nacos/src/main/java/org/apache/dubbo/registry/nacos/NacosRegistry.java b/dubbo-registry/dubbo-registry-nacos/src/main/java/org/apache/dubbo/registry/nacos/NacosRegistry.java
index 9987986..060bf20 100644
--- a/dubbo-registry/dubbo-registry-nacos/src/main/java/org/apache/dubbo/registry/nacos/NacosRegistry.java
+++ b/dubbo-registry/dubbo-registry-nacos/src/main/java/org/apache/dubbo/registry/nacos/NacosRegistry.java
@@ -34,24 +34,23 @@
 import com.alibaba.nacos.api.naming.listener.NamingEvent;
 import com.alibaba.nacos.api.naming.pojo.Instance;
 import com.alibaba.nacos.api.naming.pojo.ListView;
-import com.google.common.collect.Lists;
 
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.LinkedHashSet;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
-import java.util.concurrent.ConcurrentMap;
-import java.util.concurrent.ConcurrentHashMap;
 import java.util.stream.Collectors;
-import java.util.Collections;
 
 import static org.apache.dubbo.common.constants.CommonConstants.ANY_VALUE;
 import static org.apache.dubbo.common.constants.CommonConstants.GROUP_KEY;
@@ -124,7 +123,9 @@
 
     private final NacosNamingServiceWrapper namingService;
 
-    private final ConcurrentMap<URL, ConcurrentMap<NotifyListener, EventListener>> nacosListeners = new ConcurrentHashMap<>();
+    private final ConcurrentMap<URL, ConcurrentMap<NotifyListener, NacosAggregateListener>> originToAggregateListener = new ConcurrentHashMap<>();
+
+    private final ConcurrentMap<URL, ConcurrentMap<NacosAggregateListener, EventListener>> nacosListeners = new ConcurrentHashMap<>();
 
     public NacosRegistry(URL url, NacosNamingServiceWrapper namingService) {
         super(url);
@@ -179,7 +180,10 @@
 
     @Override
     public void doSubscribe(final URL url, final NotifyListener listener) {
-        Set<String> serviceNames = getServiceNames(url, listener);
+        NacosAggregateListener nacosAggregateListener = new NacosAggregateListener(listener);
+        originToAggregateListener.computeIfAbsent(url, k -> new ConcurrentHashMap<>()).put(listener, nacosAggregateListener);
+
+        Set<String> serviceNames = getServiceNames(url, nacosAggregateListener);
 
         //Set corresponding serviceNames for easy search later
         if (isServiceNamesWithCompatibleMode(url)) {
@@ -187,14 +191,12 @@
                 NacosInstanceManageUtil.setCorrespondingServiceNames(serviceName, serviceNames);
             }
         }
-
-        doSubscribe(url, listener, serviceNames);
+        doSubscribe(url, nacosAggregateListener, serviceNames);
     }
 
-    private void doSubscribe(final URL url, final NotifyListener listener, final Set<String> serviceNames) {
+    private void doSubscribe(final URL url, final NacosAggregateListener listener, final Set<String> serviceNames) {
         execute(namingService -> {
             if (isServiceNamesWithCompatibleMode(url)) {
-                List<Instance> allCorrespondingInstanceList = Lists.newArrayList();
 
                 /**
                  * Get all instances with serviceNames to avoid instance overwrite and but with empty instance mentioned
@@ -209,9 +211,8 @@
                     List<Instance> instances = namingService.getAllInstances(serviceName,
                             getUrl().getParameter(GROUP_KEY, Constants.DEFAULT_GROUP));
                     NacosInstanceManageUtil.initOrRefreshServiceInstanceList(serviceName, instances);
-                    allCorrespondingInstanceList.addAll(instances);
+                    notifySubscriber(url, serviceName, listener, instances);
                 }
-                notifySubscriber(url, listener, allCorrespondingInstanceList);
                 for (String serviceName : serviceNames) {
                     subscribeEventListener(serviceName, url, listener);
                 }
@@ -220,7 +221,7 @@
                 for (String serviceName : serviceNames) {
                     instances.addAll(namingService.getAllInstances(serviceName
                             , getUrl().getParameter(GROUP_KEY, Constants.DEFAULT_GROUP)));
-                    notifySubscriber(url, listener, instances);
+                    notifySubscriber(url, serviceName, listener, instances);
                     subscribeEventListener(serviceName, url, listener);
                 }
             }
@@ -243,18 +244,24 @@
     public void doUnsubscribe(URL url, NotifyListener listener) {
         if (isAdminProtocol(url)) {
             shutdownServiceNamesLookup();
-        }
-        else {
-            Set<String> serviceNames = getServiceNames(url, listener);
+        } else {
+            Map<NotifyListener, NacosAggregateListener> listenerMap = originToAggregateListener.get(url);
+            NacosAggregateListener nacosAggregateListener = listenerMap.remove(listener);
+            if (nacosAggregateListener != null) {
+                Set<String> serviceNames = getServiceNames(url, nacosAggregateListener);
 
-            doUnsubscribe(url, listener, serviceNames);
+                doUnsubscribe(url, nacosAggregateListener, serviceNames);
+            }
+            if (listenerMap.isEmpty()) {
+                originToAggregateListener.remove(url);
+            }
         }
     }
 
-    private void doUnsubscribe(final URL url, final NotifyListener listener, final Set<String> serviceNames) {
+    private void doUnsubscribe(final URL url, final NacosAggregateListener nacosAggregateListener, final Set<String> serviceNames) {
         execute(namingService -> {
             for (String serviceName : serviceNames) {
-                unsubscribeEventListener(serviceName, url, listener);
+                unsubscribeEventListener(serviceName, url, nacosAggregateListener);
             }
         });
     }
@@ -272,7 +279,7 @@
      * @param listener {@link NotifyListener}
      * @return non-null
      */
-    private Set<String> getServiceNames(URL url, NotifyListener listener) {
+    private Set<String> getServiceNames(URL url, NacosAggregateListener listener) {
         if (isAdminProtocol(url)) {
             scheduleServiceNamesLookup(url, listener);
             return getServiceNamesForOps(url);
@@ -306,7 +313,7 @@
         Set<String> serviceNames = new LinkedHashSet<>();
 
         execute(namingService -> serviceNames.addAll(namingService.getServicesOfServer(1, Integer.MAX_VALUE,
-                getUrl().getParameter(GROUP_KEY, Constants.DEFAULT_GROUP)).getData()
+                        getUrl().getParameter(GROUP_KEY, Constants.DEFAULT_GROUP)).getData()
                 .stream()
                 .filter(this::isConformRules)
                 .map(NacosServiceName::new)
@@ -357,7 +364,7 @@
         return ADMIN_PROTOCOL.equals(url.getProtocol());
     }
 
-    private void scheduleServiceNamesLookup(final URL url, final NotifyListener listener) {
+    private void scheduleServiceNamesLookup(final URL url, final NacosAggregateListener listener) {
         if (scheduledExecutorService == null) {
             scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
             scheduledExecutorService.scheduleAtFixedRate(() -> {
@@ -510,9 +517,9 @@
         return urls;
     }
 
-    private void subscribeEventListener(String serviceName, final URL url, final NotifyListener listener)
+    private void subscribeEventListener(String serviceName, final URL url, final NacosAggregateListener listener)
             throws NacosException {
-        ConcurrentMap<NotifyListener, EventListener> listeners = nacosListeners.computeIfAbsent(url, k -> new ConcurrentHashMap<>());
+        ConcurrentMap<NacosAggregateListener, EventListener> listeners = nacosListeners.computeIfAbsent(url, k -> new ConcurrentHashMap<>());
         EventListener nacosListener = listeners.computeIfAbsent(listener, k -> {
             EventListener eventListener = event -> {
                 if (event instanceof NamingEvent) {
@@ -528,7 +535,7 @@
                         instances = NacosInstanceManageUtil.getAllCorrespondingServiceInstanceList(serviceName);
                     }
 
-                    notifySubscriber(url, listener, instances);
+                    notifySubscriber(url, serviceName, listener, instances);
                 }
             };
             return eventListener;
@@ -538,14 +545,14 @@
                 nacosListener);
     }
 
-    private void unsubscribeEventListener(String serviceName, final URL url, final NotifyListener listener)
+    private void unsubscribeEventListener(String serviceName, final URL url, final NacosAggregateListener listener)
             throws NacosException {
-        ConcurrentMap<NotifyListener, EventListener> notifyListenerEventListenerConcurrentMap = nacosListeners.get(url);
-        if(notifyListenerEventListenerConcurrentMap == null){
+        ConcurrentMap<NacosAggregateListener, EventListener> notifyListenerEventListenerConcurrentMap = nacosListeners.get(url);
+        if (notifyListenerEventListenerConcurrentMap == null) {
             return;
         }
         EventListener nacosListener = notifyListenerEventListenerConcurrentMap.get(listener);
-        if(nacosListener == null){
+        if (nacosListener == null) {
             return;
         }
         namingService.unsubscribe(serviceName,
@@ -560,14 +567,14 @@
      * @param listener  {@link NotifyListener}
      * @param instances all {@link Instance instances}
      */
-    private void notifySubscriber(URL url, NotifyListener listener, Collection<Instance> instances) {
+    private void notifySubscriber(URL url, String serviceName, NacosAggregateListener listener, Collection<Instance> instances) {
         List<Instance> enabledInstances = new LinkedList<>(instances);
         if (enabledInstances.size() > 0) {
             //  Instances
             filterEnabledInstances(enabledInstances);
         }
-        List<URL> urls = toUrlWithEmpty(url, enabledInstances);
-        NacosRegistry.this.notify(url, listener, urls);
+        List<URL> aggregatedUrls = toUrlWithEmpty(url, listener.saveAndAggregateAllInstances(serviceName, enabledInstances));
+        NacosRegistry.this.notify(url, listener.getNotifyListener(), aggregatedUrls);
     }
 
     /**
diff --git a/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/RpcInvocation.java b/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/RpcInvocation.java
index f94c001..508a475 100644
--- a/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/RpcInvocation.java
+++ b/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/RpcInvocation.java
@@ -440,8 +440,7 @@
     @Override
     public String toString() {
         return "RpcInvocation [methodName=" + methodName + ", parameterTypes="
-                + Arrays.toString(parameterTypes) + ", arguments=" + Arrays.toString(arguments)
-                + ", attachments=" + attachments + "]";
+                + Arrays.toString(parameterTypes) + "]";
     }
 
 }