org.redisson.rx.RedissonTopicRx Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of killbill-platform-service-registry Show documentation
There is a newer version: 0.40.13
Show newest version
/**
 * Copyright 2018 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.rx;

import java.util.concurrent.atomic.AtomicLong;

import org.redisson.api.RFuture;
import org.redisson.api.RTopic;
import org.redisson.api.listener.MessageListener;

import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.FutureListener;
import io.reactivex.Flowable;
import io.reactivex.functions.Action;
import io.reactivex.functions.LongConsumer;
import io.reactivex.processors.ReplayProcessor;

/**
 * 
 * @author Nikita Koksharov
 *
 */
public class RedissonTopicRx {

    private final RTopic topic;
    
    public RedissonTopicRx(RTopic topic) {
        this.topic = topic;
    }

    public  Flowable getMessages(final Class type) {
        final ReplayProcessor p = ReplayProcessor.create();
        return p.doOnRequest(new LongConsumer() {
            @Override
            public void accept(long n) throws Exception {
                final AtomicLong counter = new AtomicLong(n);
                RFuture t = topic.addListenerAsync(type, new MessageListener() {
                    @Override
                    public void onMessage(CharSequence channel, M msg) {
                        p.onNext(msg);
                        if (counter.decrementAndGet() == 0) {
                            topic.removeListenerAsync(this);
                            p.onComplete();
                        }
                    }
                });
                t.addListener(new FutureListener() {
                    @Override
                    public void operationComplete(Future future) throws Exception {
                        if (!future.isSuccess()) {
                            p.onError(future.cause());
                            return;
                        }
                        
                        final Integer id = future.getNow();
                        p.doOnCancel(new Action() {
                            @Override
                            public void run() throws Exception {
                                topic.removeListenerAsync(id);
                            }
                        });
                    }
                });
            }
        });
    }
    
}