org.redisson.reactive.RedissonListReactive 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.reactive;

import java.util.function.Consumer;
import java.util.function.LongConsumer;

import org.reactivestreams.Publisher;
import org.redisson.RedissonList;
import org.redisson.api.RFuture;
import org.redisson.api.RListAsync;
import org.redisson.client.codec.Codec;

import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.FutureListener;
import reactor.core.publisher.Flux;
import reactor.core.publisher.FluxSink;

/**
 * Distributed and concurrent implementation of {@link java.util.List}
 *
 * @author Nikita Koksharov
 *
 * @param  the type of elements held in this collection
 */
public class RedissonListReactive {

    private final RListAsync instance;
    
    public RedissonListReactive(RListAsync instance) {
        this.instance = instance;
    }

    public RedissonListReactive(CommandReactiveExecutor commandExecutor, String name) {
        this.instance = new RedissonList(commandExecutor, name, null);
    }

    public RedissonListReactive(Codec codec, CommandReactiveExecutor commandExecutor, String name) {
        this.instance = new RedissonList(codec, commandExecutor, name, null);
    }
    
    public Publisher descendingIterator() {
        return iterator(-1, false);
    }

    public Publisher iterator() {
        return iterator(0, true);
    }

    public Publisher descendingIterator(int startIndex) {
        return iterator(startIndex, false);
    }

    public Publisher iterator(int startIndex) {
        return iterator(startIndex, true);
    }

    private Publisher iterator(final int startIndex, final boolean forward) {
        return Flux.create(new Consumer>() {

            @Override
            public void accept(FluxSink emitter) {
                emitter.onRequest(new LongConsumer() {
                    
                    int currentIndex = startIndex;
                    
                    @Override
                    public void accept(long value) {
                        onRequest(forward, emitter, value);
                    }
                    
                    protected void onRequest(final boolean forward, FluxSink emitter, long n) {
                        instance.getAsync(currentIndex).addListener(new FutureListener() {
                            @Override
                            public void operationComplete(Future future) throws Exception {
                                if (!future.isSuccess()) {
                                    emitter.error(future.cause());
                                    return;
                                }

                                V value = future.getNow();
                                if (value != null) {
                                emitter.next(value);
                                if (forward) {
                                    currentIndex++;
                                } else {
                                    currentIndex--;
                                }
                            }

                                if (value == null) {
                                    emitter.complete();
                                    return;
                                }
                                if (n-1 == 0) {
                                    return;
                                }
                                onRequest(forward, emitter, n-1);
                            }
                        });
                    }
                });
                
            }

        });
    }
    
    public Publisher addAll(Publisher c) {
        return new PublisherAdder() {

            @Override
            public RFuture add(Object o) {
                return instance.addAsync((V)o);
            }

        }.addAll(c);
    }

}