9621a5b981
Motivation: Some imports are not used Modification: remove unused imports Result: Code cleanup
91 lines
3.0 KiB
Java
91 lines
3.0 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.serialization;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.ByteBufOutputStream;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.MessageToByteEncoder;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.io.OutputStream;
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import java.io.Serializable;
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/**
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* An encoder which serializes a Java object into a {@link ByteBuf}
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* (interoperability version).
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* <p>
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* This encoder is interoperable with the standard Java object streams such as
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* {@link ObjectInputStream} and {@link ObjectOutputStream}.
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*/
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public class CompatibleObjectEncoder extends MessageToByteEncoder<Serializable> {
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private final int resetInterval;
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private int writtenObjects;
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/**
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* Creates a new instance with the reset interval of {@code 16}.
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*/
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public CompatibleObjectEncoder() {
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this(16); // Reset at every sixteen writes
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}
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/**
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* Creates a new instance.
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*
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* @param resetInterval
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* the number of objects between {@link ObjectOutputStream#reset()}.
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* {@code 0} will disable resetting the stream, but the remote
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* peer will be at the risk of getting {@link OutOfMemoryError} in
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* the long term.
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*/
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public CompatibleObjectEncoder(int resetInterval) {
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if (resetInterval < 0) {
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throw new IllegalArgumentException(
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"resetInterval: " + resetInterval);
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}
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this.resetInterval = resetInterval;
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}
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/**
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* Creates a new {@link ObjectOutputStream} which wraps the specified
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* {@link OutputStream}. Override this method to use a subclass of the
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* {@link ObjectOutputStream}.
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*/
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protected ObjectOutputStream newObjectOutputStream(OutputStream out) throws Exception {
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return new ObjectOutputStream(out);
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}
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@Override
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protected void encode(ChannelHandlerContext ctx, Serializable msg, ByteBuf out) throws Exception {
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ObjectOutputStream oos = newObjectOutputStream(new ByteBufOutputStream(out));
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try {
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if (resetInterval != 0) {
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// Resetting will prevent OOM on the receiving side.
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writtenObjects ++;
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if (writtenObjects % resetInterval == 0) {
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oos.reset();
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}
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}
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oos.writeObject(msg);
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oos.flush();
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} finally {
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oos.close();
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}
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}
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}
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