spark MessageHandler 源码
spark MessageHandler 代码
文件路径：/common/network-common/src/main/java/org/apache/spark/network/server/MessageHandler.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.spark.network.server;
import org.apache.spark.network.protocol.Message;
/**
* Handles either request or response messages coming off of Netty. A MessageHandler instance
* is associated with a single Netty Channel (though it may have multiple clients on the same
* Channel.)
*/
public abstract class MessageHandler<T extends Message> {
/** Handles the receipt of a single message. */
public abstract void handle(T message) throws Exception;
/** Invoked when the channel this MessageHandler is on is active. */
public abstract void channelActive();
/** Invoked when an exception was caught on the Channel. */
public abstract void exceptionCaught(Throwable cause);
/** Invoked when the channel this MessageHandler is on is inactive. */
public abstract void channelInactive();
}
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