spark MessageDecoder 源码
spark MessageDecoder 代码
文件路径：/common/network-common/src/main/java/org/apache/spark/network/protocol/MessageDecoder.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.protocol;
import java.util.List;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageDecoder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Decoder used by the client side to encode server-to-client responses.
* This encoder is stateless so it is safe to be shared by multiple threads.
*/
@ChannelHandler.Sharable
public final class MessageDecoder extends MessageToMessageDecoder<ByteBuf> {
private static final Logger logger = LoggerFactory.getLogger(MessageDecoder.class);
public static final MessageDecoder INSTANCE = new MessageDecoder();
private MessageDecoder() {}
@Override
public void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) {
Message.Type msgType = Message.Type.decode(in);
Message decoded = decode(msgType, in);
assert decoded.type() == msgType;
logger.trace("Received message {}: {}", msgType, decoded);
out.add(decoded);
}
private Message decode(Message.Type msgType, ByteBuf in) {
switch (msgType) {
case ChunkFetchRequest:
return ChunkFetchRequest.decode(in);
case ChunkFetchSuccess:
return ChunkFetchSuccess.decode(in);
case ChunkFetchFailure:
return ChunkFetchFailure.decode(in);
case RpcRequest:
return RpcRequest.decode(in);
case RpcResponse:
return RpcResponse.decode(in);
case RpcFailure:
return RpcFailure.decode(in);
case OneWayMessage:
return OneWayMessage.decode(in);
case StreamRequest:
return StreamRequest.decode(in);
case StreamResponse:
return StreamResponse.decode(in);
case StreamFailure:
return StreamFailure.decode(in);
case UploadStream:
return UploadStream.decode(in);
case MergedBlockMetaRequest:
return MergedBlockMetaRequest.decode(in);
case MergedBlockMetaSuccess:
return MergedBlockMetaSuccess.decode(in);
default:
throw new IllegalArgumentException("Unexpected message type: " + msgType);
}
}
}
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