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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.codec.decoder;

import com.hivemq.client.internal.mqtt.message.MqttMessage;
import io.netty.buffer.ByteBuf;
import org.jetbrains.annotations.NotNull;

/**
 * Decoder for a MQTT message type.
 *
 * @author Silvio Giebl
 */
public interface MqttMessageDecoder {

    /**
     * Decodes a MQTT message from the given byte buffer.
     *
     * @param flags   the flags of the fixed header.
     * @param in      the byte buffer which contains the encoded MQTT message without the fixed header.
     * @param context the decoder context.
     * @return the decoded MQTT message or null if there are not enough bytes in the byte buffer.
     * @throws MqttDecoderException if the byte buffer did not contain a valid encoded MQTT message.
     */
    @NotNull MqttMessage decode(int flags, @NotNull ByteBuf in, @NotNull MqttDecoderContext context)
            throws MqttDecoderException;
}