spark Encodable 源码
spark Encodable 代码
文件路径：/common/network-common/src/main/java/org/apache/spark/network/protocol/Encodable.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;
/**
* Interface for an object which can be encoded into a ByteBuf. Multiple Encodable objects are
* stored in a single, pre-allocated ByteBuf, so Encodables must also provide their length.
*
* Encodable objects should provide a static "decode(ByteBuf)" method which is invoked by
* {@link MessageDecoder}. During decoding, if the object uses the ByteBuf as its data (rather than
* just copying data from it), then you must retain() the ByteBuf.
*
* Additionally, when adding a new Encodable Message, add it to {@link Message.Type}.
*/
public interface Encodable {
/** Number of bytes of the encoded form of this object. */
int encodedLength();
/**
* Serializes this object by writing into the given ByteBuf.
* This method must write exactly encodedLength() bytes.
*/
void encode(ByteBuf buf);
}
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