dubbo AppStateRouterFactory 源码
dubbo AppStateRouterFactory 代码
文件路径：/dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/router/condition/config/AppStateRouterFactory.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.router.condition.config;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.extension.Activate;
import org.apache.dubbo.rpc.cluster.router.state.StateRouter;
import org.apache.dubbo.rpc.cluster.router.state.StateRouterFactory;
/**
* Application level router factory
* AppRouter should after ServiceRouter
*/
@Activate(order = 150)
public class AppStateRouterFactory implements StateRouterFactory {
public static final String NAME = "app";
private volatile StateRouter router;
@Override
public <T> StateRouter<T> getRouter(Class<T> interfaceClass, URL url) {
if (router != null) {
return router;
}
synchronized (this) {
if (router == null) {
router = createRouter(url);
}
}
return router;
}
private <T> StateRouter<T> createRouter(URL url) {
return new AppStateRouter<>(url);
}
}
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