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HiveMQ MQTT Client is an MQTT 5.0 and MQTT 3.1.1 compatible and feature-rich high-performance Java client library with different API flavours and backpressure support

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/*
 * Copyright 2018-present HiveMQ and the HiveMQ Community
 *
 * 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.hivemq.client.internal.mqtt.handler;

import com.hivemq.client.internal.mqtt.handler.disconnect.MqttDisconnectEvent;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * @author Silvio Giebl
 */
public abstract class MqttConnectionAwareHandler extends ChannelInboundHandlerAdapter {

    protected @Nullable ChannelHandlerContext ctx;

    @Override
    public void handlerAdded(final @NotNull ChannelHandlerContext ctx) {
        this.ctx = ctx;
    }

    @Override
    public void userEventTriggered(final @NotNull ChannelHandlerContext ctx, final @NotNull Object evt) {
        if ((evt instanceof MqttDisconnectEvent) && (this.ctx != null)) {
            this.ctx = null;
            onDisconnectEvent(ctx, (MqttDisconnectEvent) evt);
        }
        ctx.fireUserEventTriggered(evt);
    }

    protected abstract void onDisconnectEvent(
            final @NotNull ChannelHandlerContext ctx, final @NotNull MqttDisconnectEvent disconnectEvent);

    @Override
    public boolean isSharable() {
        return false;
    }
}