dubbo ListenableFilter 源码
dubbo ListenableFilter 代码
文件路径：/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/ListenableFilter.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;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
/**
* It's recommended to implement Filter.Listener directly for callback registration, check the default implementation,
* see {@link org.apache.dubbo.rpc.filter.ExceptionFilter}, for example.
* <p>
* If you do not want to share Listener instance between RPC calls. ListenableFilter can be used
* to keep a 'one Listener each RPC call' model.
*/
@Deprecated
public abstract class ListenableFilter implements Filter {
protected Listener listener = null;
protected final ConcurrentMap<Invocation, Listener> listeners = new ConcurrentHashMap<>();
public Listener listener() {
return listener;
}
public Listener listener(Invocation invocation) {
Listener invListener = listeners.get(invocation);
if (invListener == null) {
invListener = listener;
}
return invListener;
}
public void addListener(Invocation invocation, Listener listener) {
listeners.putIfAbsent(invocation, listener);
}
public void removeListener(Invocation invocation) {
listeners.remove(invocation);
}
}
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