org.r358.poolnetty.test.simpleserver.SimpleInboundHandler.java Source code

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Here is the source code for org.r358.poolnetty.test.simpleserver.SimpleInboundHandler.java

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/*
 * Copyright (c) 2014 R358 https://github.com/R358
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
 * associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
 * LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package org.r358.poolnetty.test.simpleserver;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;

import java.util.List;

/**
 * Reads length encoded bytes and when available converts them back to a string.
 */
public class SimpleInboundHandler extends ByteToMessageDecoder {

    private final int id;

    public SimpleInboundHandler(int id) {
        this.id = id;
    }

    public SimpleInboundHandler() {
        id = -1;
    }

    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
        if (in.readableBytes() > 4) {
            int len = in.readInt();
            if (len > 65535) {
                throw new IllegalStateException("Too long: " + len);
            }

            if (in.readableBytes() >= len) {
                byte[] b = new byte[len];
                in.readBytes(b);
                out.add(new String(b, SimpleServer.UTF_8));
            }
        }
    }
}