dubbo ClusterInvoker 源码
dubbo ClusterInvoker 代码
文件路径：/dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/ClusterInvoker.java
/*
* 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;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.rpc.Invoker;
/**
* This is the final Invoker type referenced by the RPC proxy on Consumer side.
* <p>
* A ClusterInvoker holds a group of normal invokers, stored in a Directory, mapping to one Registry.
* The ClusterInvoker implementation usually provides LB or HA policies, like FailoverClusterInvoker.
* <p>
* In multi-registry subscription scenario, the final ClusterInvoker will refer to several sub ClusterInvokers, with each
* sub ClusterInvoker representing one Registry. Take ZoneAwareClusterInvoker as an example, it is specially customized for
* multi-registry use cases: first, pick up one ClusterInvoker, then do LB inside the chose ClusterInvoker.
*
* @param <T>
*/
public interface ClusterInvoker<T> extends Invoker<T> {
URL getRegistryUrl();
Directory<T> getDirectory();
boolean isDestroyed();
default boolean isServiceDiscovery() {
Directory<T> directory = getDirectory();
if (directory == null) {
return false;
}
return directory.isServiceDiscovery();
}
default boolean hasProxyInvokers() {
Directory<T> directory = getDirectory();
if (directory == null) {
return false;
}
return !directory.isEmpty();
}
}
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