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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 dc-square and the HiveMQ MQTT Client Project
 *
 * 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.codec.encoder.mqtt3;

import com.hivemq.client.internal.mqtt.codec.encoder.MqttEncoderContext;
import com.hivemq.client.internal.mqtt.codec.encoder.MqttMessageEncoder;
import com.hivemq.client.internal.mqtt.message.disconnect.MqttDisconnect;
import com.hivemq.client.mqtt.mqtt3.message.Mqtt3MessageType;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import org.jetbrains.annotations.NotNull;

import javax.inject.Inject;
import javax.inject.Singleton;

/**
 * @author Silvio Giebl
 */
@Singleton
public class Mqtt3DisconnectEncoder extends MqttMessageEncoder {

    private static final int ENCODED_LENGTH = 2;
    private static final @NotNull ByteBuf PACKET =
            Unpooled.directBuffer(ENCODED_LENGTH).writeByte(Mqtt3MessageType.DISCONNECT.getCode() << 4).writeByte(0);

    @Inject
    Mqtt3DisconnectEncoder() {}

    @Override
    protected @NotNull ByteBuf encode(
            final @NotNull MqttDisconnect message, final @NotNull MqttEncoderContext context) {

        return PACKET.retainedDuplicate();
    }
}