3.1 callback filter

dubbo-common/src/main/java/org/apache/dubbo/common/constants/CommonConstants.java

@@ -32,6 +32,8 @@ public interface CommonConstants {
     String PROVIDER = "provider";
 
     String CONSUMER = "consumer";
+
+    String CALLBACK = "callback";
 
     String APPLICATION_KEY = "application";
 

dubbo-monitor/dubbo-monitor-api/src/main/java/org/apache/dubbo/monitor/support/CallbackConsumerContextFilter.java

@@ -0,0 +1,37 @@
+/*
+ * 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.monitor.support;
+
+import org.apache.dubbo.common.extension.Activate;
+import org.apache.dubbo.rpc.Filter;
+import org.apache.dubbo.rpc.cluster.filter.support.ConsumerContextFilter;
+import org.apache.dubbo.rpc.model.ApplicationModel;
+
+import static org.apache.dubbo.common.constants.CommonConstants.CALLBACK;
+
+/**
+ * CallbackConsumerContextFilter set current RpcContext with invoker,invocation, local host, remote host and port
+ * for consumer callback invoker.It does it to make the requires info available to execution thread's RpcContext.
+ * @see ConsumerContextFilter
+ */
+@Activate(group = CALLBACK, order = Integer.MIN_VALUE)
+public class CallbackConsumerContextFilter extends ConsumerContextFilter implements Filter {
+
+    public CallbackConsumerContextFilter(ApplicationModel applicationModel) {
+        super(applicationModel);
+    }
+}

dubbo-monitor/dubbo-monitor-api/src/main/resources/META-INF/dubbo/internal/org.apache.dubbo.rpc.Filter

@@ -1 +1,2 @@
 monitor=org.apache.dubbo.monitor.support.MonitorFilter
+callback-consumer-context=org.apache.dubbo.monitor.support.CallbackConsumerContextFilter

dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/CallbackServiceCodec.java

@@ -18,6 +18,7 @@
 
 import org.apache.dubbo.common.BaseServiceMetadata;
 import org.apache.dubbo.common.URL;
+import org.apache.dubbo.common.constants.CommonConstants;
 import org.apache.dubbo.common.logger.ErrorTypeAwareLogger;
 import org.apache.dubbo.common.logger.LoggerFactory;
 import org.apache.dubbo.common.url.component.ServiceConfigURL;
@@ -33,10 +34,12 @@
 import org.apache.dubbo.rpc.Protocol;
 import org.apache.dubbo.rpc.ProxyFactory;
 import org.apache.dubbo.rpc.RpcInvocation;
+import org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder;
 import org.apache.dubbo.rpc.model.ApplicationModel;
 import org.apache.dubbo.rpc.model.FrameworkModel;
 import org.apache.dubbo.rpc.model.ModuleModel;
 import org.apache.dubbo.rpc.model.ProviderModel;
+import org.apache.dubbo.rpc.model.ScopeModelUtil;
 import org.apache.dubbo.rpc.model.ServiceDescriptor;
 import org.apache.dubbo.rpc.model.ServiceMetadata;
 
@@ -46,11 +49,14 @@
 import java.util.Set;
 
 import static org.apache.dubbo.common.constants.CommonConstants.CALLBACK_INSTANCES_LIMIT_KEY;
+import static org.apache.dubbo.common.constants.CommonConstants.CONSUMER_SIDE;
 import static org.apache.dubbo.common.constants.CommonConstants.DEFAULT_CALLBACK_INSTANCES;
 import static org.apache.dubbo.common.constants.CommonConstants.DUBBO_PROTOCOL;
 import static org.apache.dubbo.common.constants.CommonConstants.GROUP_KEY;
 import static org.apache.dubbo.common.constants.CommonConstants.INTERFACE_KEY;
 import static org.apache.dubbo.common.constants.CommonConstants.METHODS_KEY;
+import static org.apache.dubbo.common.constants.CommonConstants.REFERENCE_FILTER_KEY;
+import static org.apache.dubbo.common.constants.CommonConstants.SIDE_KEY;
 import static org.apache.dubbo.common.constants.CommonConstants.VERSION_KEY;
 import static org.apache.dubbo.common.constants.LoggerCodeConstants.PROTOCOL_FAILED_DESTROY_INVOKER;
 import static org.apache.dubbo.common.constants.LoggerCodeConstants.PROTOCOL_FAILED_LOAD_MODEL;
@@ -201,11 +207,16 @@ private Object referOrDestroyCallbackService(Channel channel, URL url, Class<?>
         if (isRefer) {
             if (proxy == null) {
                 URL referurl = URL.valueOf("callback://" + url.getAddress() + "/" + clazz.getName() + "?" + INTERFACE_KEY + "=" + clazz.getName());
-                referurl = referurl.addParametersIfAbsent(url.getParameters()).removeParameter(METHODS_KEY);
+                referurl = referurl.addParametersIfAbsent(url.getParameters()).removeParameter(METHODS_KEY).addParameter(SIDE_KEY, CONSUMER_SIDE);
                 if (!isInstancesOverLimit(channel, referurl, clazz.getName(), instid, true)) {
                     url.getOrDefaultApplicationModel().getDefaultModule().getServiceRepository().registerService(clazz);
                     @SuppressWarnings("rawtypes")
                     Invoker<?> invoker = new ChannelWrappedInvoker(clazz, channel, referurl, String.valueOf(instid));
+
+                    FilterChainBuilder builder = getFilterChainBuilder(url);
+                    invoker = builder.buildInvokerChain(invoker, REFERENCE_FILTER_KEY, CommonConstants.CONSUMER);
+                    invoker = builder.buildInvokerChain(invoker, REFERENCE_FILTER_KEY, CommonConstants.CALLBACK);
+
                     proxy = proxyFactory.getProxy(invoker);
                     channel.setAttribute(proxyCacheKey, proxy);
                     channel.setAttribute(invokerCacheKey, invoker);
@@ -243,6 +254,10 @@ private Object referOrDestroyCallbackService(Channel channel, URL url, Class<?>
         return proxy;
     }
 
+    private FilterChainBuilder getFilterChainBuilder(URL url) {
+        return ScopeModelUtil.getExtensionLoader(FilterChainBuilder.class, url.getScopeModel()).getDefaultExtension();
+    }
+
     private static String getClientSideCallbackServiceCacheKey(int instid) {
         return CALLBACK_SERVICE_KEY + "." + instid;
     }