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• PublisherWithSingle.java

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com.hivemq.client.rx.reactivestreams.PublisherWithSingle Maven / Gradle / Ivy

/*
 * 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.Publisher;
import org.reactivestreams.Subscriber;

/**
 * A {@link Publisher} which emits a flow of items of type {@link T} and a single item of type {@link S}.
 *
 * @param  the type of the stream of items.
 * @param  the type of the single item.
 * @author Silvio Giebl
 * @see Publisher
 */
public interface PublisherWithSingle extends Publisher {

    /**
     * Does {@link Publisher#subscribe(Subscriber) subscribe} to this {@link PublisherWithSingle}. {@link
     * WithSingleSubscriber#onSingle(Object)} will be notified on the single item.
     *
     * @param subscriber the {@link WithSingleSubscriber} that will consume signals from this {@link
     *                   PublisherWithSingle}.
     * @see Publisher#subscribe(Subscriber)
     */
    void subscribeBoth(@NotNull WithSingleSubscriber subscriber);
}