io.netty.handler.codec.bytes.ByteArrayEncoder Maven / Gradle / Ivy
/*
* Copyright 2012 The Netty Project
*
* The Netty Project 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 io.netty.handler.codec.bytes;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;
import io.netty.handler.codec.MessageToMessageEncoder;
import java.util.List;
/**
* Encodes the requested array of bytes into a {@link ByteBuf}.
* A typical setup for TCP/IP would be:
*
* {@link ChannelPipeline} pipeline = ...;
*
* // Decoders
* pipeline.addLast("frameDecoder",
* new {@link LengthFieldBasedFrameDecoder}(1048576, 0, 4, 0, 4));
* pipeline.addLast("bytesDecoder",
* new {@link ByteArrayDecoder}());
*
* // Encoder
* pipeline.addLast("frameEncoder", new {@link LengthFieldPrepender}(4));
* pipeline.addLast("bytesEncoder", new {@link ByteArrayEncoder}());
*
* and then you can use an array of bytes instead of a {@link ByteBuf}
* as a message:
*
* void channelRead({@link ChannelHandlerContext} ctx, byte[] bytes) {
* ...
* }
*
*/
@Sharable
public class ByteArrayEncoder extends MessageToMessageEncoder {
@Override
protected void encode(ChannelHandlerContext ctx, byte[] msg, List