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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.rx.reactivestreams;

import org.jetbrains.annotations.NotNull;
import org.reactivestreams.Subscriber;

/**
 * A {@link Subscriber} which consumes also a single item of type {@link S} by {@link #onSingle(Object)} besides items
 * of type {@link T} by {@link #onNext(Object)}.
 *
 * @author Silvio Giebl
 * @see Subscriber
 */
public interface WithSingleSubscriber extends Subscriber {

    /**
     * Single item sent by the {@link PublisherWithSingle}.
     *
     * @param s the single item.
     */
    void onSingle(@NotNull S s);
}