shenyu-protocol/shenyu-protocol-mqtt/src/main/java/org/apache/shenyu/protocol/mqtt/MqttTransportServerInitializer.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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 org.apache.shenyu.protocol.mqtt;

import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.mqtt.MqttDecoder;
import io.netty.handler.codec.mqtt.MqttEncoder;

/**
 * mqtt transport server init.
 */
public class MqttTransportServerInitializer extends ChannelInitializer<SocketChannel> {

    private final int maxPayloadSize;

    public MqttTransportServerInitializer(final int maxPayloadSize) {
        this.maxPayloadSize = maxPayloadSize;
    }

    @Override
    protected void initChannel(final SocketChannel ch) throws Exception {
        ChannelPipeline pipeline = ch.pipeline();
        pipeline.addLast("decoder", new MqttDecoder(maxPayloadSize));
        pipeline.addLast("encoder", MqttEncoder.INSTANCE);
        MqttTransportHandler handler = new MqttTransportHandler();
        pipeline.addLast(handler);
        ch.closeFuture().addListener(handler);
    }
}