org.code_house.ebus.netty.codec.AckTelegramDecoder.java Source code

Introduction

Here is the source code for org.code_house.ebus.netty.codec.AckTelegramDecoder.java

Source

/*
 * (C) Copyright 2017 Code-House, ?ukasz Dywicki.
 *
 * 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 org.code_house.ebus.netty.codec;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;
import org.code_house.ebus.api.Constants;
import org.code_house.ebus.netty.codec.struct.Confirmation;
import org.code_house.ebus.netty.codec.struct.Rejection;

import java.util.List;

// consume ack bytes after certain communications:
// master-master meaning receiver ack
// master-slave meaning sender ack [middle one consumed with slave part]
public class AckTelegramDecoder extends ByteToMessageDecoder {

    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
        byte aByte = in.readByte();
        if (in.readableBytes() > 1) {
            switch (aByte) {
            case Constants.ACK:
                out.add(new Confirmation());
                break;
            case Constants.NACK:
                out.add(new Rejection());
                break;
            default:
                out.add(in.readBytes(super.actualReadableBytes()));
            }
        }

    }

}