spark Message 源码
spark Message 代码
文件路径：/common/network-common/src/main/java/org/apache/spark/network/protocol/Message.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 io.netty.buffer.ByteBuf;
import org.apache.spark.network.buffer.ManagedBuffer;
/** An on-the-wire transmittable message. */
public interface Message extends Encodable {
/** Used to identify this request type. */
Type type();
/** An optional body for the message. */
ManagedBuffer body();
/** Whether to include the body of the message in the same frame as the message. */
boolean isBodyInFrame();
/** Preceding every serialized Message is its type, which allows us to deserialize it. */
enum Type implements Encodable {
ChunkFetchRequest(0), ChunkFetchSuccess(1), ChunkFetchFailure(2),
RpcRequest(3), RpcResponse(4), RpcFailure(5),
StreamRequest(6), StreamResponse(7), StreamFailure(8),
OneWayMessage(9), UploadStream(10), MergedBlockMetaRequest(11), MergedBlockMetaSuccess(12),
User(-1);
private final byte id;
Type(int id) {
assert id < 128 : "Cannot have more than 128 message types";
this.id = (byte) id;
}
public byte id() { return id; }
@Override public int encodedLength() { return 1; }
@Override public void encode(ByteBuf buf) { buf.writeByte(id); }
public static Type decode(ByteBuf buf) {
byte id = buf.readByte();
switch (id) {
case 0: return ChunkFetchRequest;
case 1: return ChunkFetchSuccess;
case 2: return ChunkFetchFailure;
case 3: return RpcRequest;
case 4: return RpcResponse;
case 5: return RpcFailure;
case 6: return StreamRequest;
case 7: return StreamResponse;
case 8: return StreamFailure;
case 9: return OneWayMessage;
case 10: return UploadStream;
case 11: return MergedBlockMetaRequest;
case 12: return MergedBlockMetaSuccess;
case -1: throw new IllegalArgumentException("User type messages cannot be decoded.");
default: throw new IllegalArgumentException("Unknown message type: " + id);
}
}
}
}
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