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Redis Java client with features of In-Memory Data Grid
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/**
 * Copyright (c) 2013-2022 Nikita Koksharov
 *
 * 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 org.redisson.api;

import io.reactivex.rxjava3.core.Completable;
import io.reactivex.rxjava3.core.Flowable;
import io.reactivex.rxjava3.core.Single;
import org.redisson.api.listener.MessageListener;

/**
 *
 * RxJava2 interface for Reliable topic based on Redis Stream object.
 * 
 * Dedicated Redis connection is allocated per instance (subscriber) of this object.
 * Messages are delivered to all listeners attached to the same Redis setup.
 * 

 * Requires Redis 5.0.0 and higher.
 * 

 * @author Nikita Koksharov
 *
 */
public interface RReliableTopicRx extends RExpirableRx {

    /**
     * Amount of messages stored in Redis Stream object.
     *
     * @return amount of messages
     */
    Single size();

    /**
     * Publish the message to all subscribers of this topic asynchronously.
     * Each subscriber may have multiple listeners.
     *
     * @param message to send
     * @return number of subscribers that received the message
     */
    Single publish(Object message);

    /**
     * Subscribes to this topic.
     * MessageListener.onMessage method is called when any message
     * is published on this topic.
     * 

     * Though messages broadcasted across all topic instances, listener is attached to this topic instance.
     * 
     * Watchdog is started when listener was registered.
     *
     * @see org.redisson.config.Config#setReliableTopicWatchdogTimeout(long)
     *
     * @param  - type of message
     * @param type - type of message
     * @param listener for messages
     * @return id of listener attached to this topic instance
     * @see MessageListener
     */
     Single addListener(Class type, MessageListener listener);
    
    /**
     * Removes the listener by id attached to this topic instance
     *
     * @param listenerIds - listener ids
     * @return void
     */
    Completable removeListener(String... listenerIds);

    /**
     * Removes all listeners attached to this topic instance
     */
    Completable removeAllListeners();

    /**
     * Returns amount of subscribers to this topic across all Redisson instances.
     * Each subscriber may have multiple listeners.
     *
     * @return amount of subscribers
     */
    Single countSubscribers();

    /**
     * Returns continues stream of published messages.
     *
     * @param  - type of message
     * @param type - type of message to listen
     * @return stream of messages
     */
     Flowable getMessages(Class type);

}