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/*
* 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.rpc.cluster.support.wrapper;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.extension.ExtensionLoader;
import org.apache.dubbo.rpc.Invocation;
import org.apache.dubbo.rpc.Invoker;
import org.apache.dubbo.rpc.Result;
import org.apache.dubbo.rpc.RpcException;
import org.apache.dubbo.rpc.cluster.Cluster;
import org.apache.dubbo.rpc.cluster.Directory;
import org.apache.dubbo.rpc.cluster.LoadBalance;
import org.apache.dubbo.rpc.cluster.interceptor.ClusterInterceptor;
import org.apache.dubbo.rpc.cluster.support.AbstractClusterInvoker;
import java.util.List;
import static org.apache.dubbo.common.constants.CommonConstants.REFERENCE_INTERCEPTOR_KEY;
public abstract class AbstractCluster implements Cluster {
private Invoker buildClusterInterceptors(AbstractClusterInvoker clusterInvoker, String key) {
AbstractClusterInvoker last = clusterInvoker;
List interceptors = ExtensionLoader.getExtensionLoader(ClusterInterceptor.class).getActivateExtension(clusterInvoker.getUrl(), key);
if (!interceptors.isEmpty()) {
for (int i = interceptors.size() - 1; i >= 0; i--) {
final ClusterInterceptor interceptor = interceptors.get(i);
final AbstractClusterInvoker next = last;
last = new InterceptorInvokerNode<>(clusterInvoker, interceptor, next);
}
}
return last;
}
@Override
public Invoker join(Directory directory) throws RpcException {
return buildClusterInterceptors(doJoin(directory), directory.getUrl().getParameter(REFERENCE_INTERCEPTOR_KEY));
}
protected abstract AbstractClusterInvoker doJoin(Directory directory) throws RpcException;
protected class InterceptorInvokerNode extends AbstractClusterInvoker {
private AbstractClusterInvoker clusterInvoker;
private ClusterInterceptor interceptor;
private AbstractClusterInvoker next;
public InterceptorInvokerNode(AbstractClusterInvoker clusterInvoker,
ClusterInterceptor interceptor,
AbstractClusterInvoker next) {
this.clusterInvoker = clusterInvoker;
this.interceptor = interceptor;
this.next = next;
}
@Override
public Class getInterface() {
return clusterInvoker.getInterface();
}
@Override
public URL getUrl() {
return clusterInvoker.getUrl();
}
@Override
public boolean isAvailable() {
return clusterInvoker.isAvailable();
}
@Override
public Result invoke(Invocation invocation) throws RpcException {
Result asyncResult;
try {
interceptor.before(next, invocation);
asyncResult = interceptor.intercept(next, invocation);
} catch (Exception e) {
// onError callback
if (interceptor instanceof ClusterInterceptor.Listener) {
ClusterInterceptor.Listener listener = (ClusterInterceptor.Listener) interceptor;
listener.onError(e, clusterInvoker, invocation);
}
throw e;
} finally {
interceptor.after(next, invocation);
}
return asyncResult.whenCompleteWithContext((r, t) -> {
// onResponse callback
if (interceptor instanceof ClusterInterceptor.Listener) {
ClusterInterceptor.Listener listener = (ClusterInterceptor.Listener) interceptor;
if (t == null) {
listener.onMessage(r, clusterInvoker, invocation);
} else {
listener.onError(t, clusterInvoker, invocation);
}
}
});
}
@Override
public void destroy() {
clusterInvoker.destroy();
}
@Override
public String toString() {
return clusterInvoker.toString();
}
@Override
protected Result doInvoke(Invocation invocation, List> invokers, LoadBalance loadbalance) throws RpcException {
// The only purpose is to build an interceptor chain, so the cluster related logic doesn't matter.
return null;
}
}
}