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Interfaces and implementations for both client and server side of DBGp

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/*
 * Copyright 2016 Codnos Ltd.
 *
 * Licensed 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 com.codnos.dbgp.internal.handlers;

import com.codnos.dbgp.internal.commands.Init;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;

import static java.nio.charset.StandardCharsets.UTF_8;

public class DBGpInitHandler extends ChannelInboundHandlerAdapter {

    private final Init initMessage;

    public DBGpInitHandler(Init initMessage) {
        this.initMessage = initMessage;
    }

    @Override
    public void channelActive(final ChannelHandlerContext ctx) {
        byte[] initBytes = initMessage.asString().getBytes(UTF_8);
        String size = String.valueOf(initBytes.length);
        byte[] sizeBytes = size.getBytes(UTF_8);
        final ByteBuf initMessageBuffer = ctx.alloc().buffer(sizeBytes.length + 1 + initBytes.length + 1);
        initMessageBuffer.writeBytes(sizeBytes);
        initMessageBuffer.writeZero(1);
        initMessageBuffer.writeBytes(initBytes);
        initMessageBuffer.writeZero(1);
        ctx.writeAndFlush(initMessageBuffer);
    }
}