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/**
 * Copyright 2014 Netflix, Inc.
 * 
 * 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 rx.operators;

import java.util.concurrent.atomic.AtomicInteger;

import rx.Observable;
import rx.Observable.Operator;
import rx.Subscriber;
import rx.observers.SerializedSubscriber;
import rx.subscriptions.CompositeSubscription;

/**
 * Flattens a list of Observables into one Observable sequence, without any transformation.
 * 

* *

* You can combine the items emitted by multiple Observables so that they act like a single * Observable, by using the merge operation. */ public final class OperatorMerge implements Operator> { @Override public Subscriber> call(final Subscriber outerOperation) { final Subscriber o = new SerializedSubscriber(outerOperation); final CompositeSubscription childrenSubscriptions = new CompositeSubscription(); outerOperation.add(childrenSubscriptions); return new Subscriber>(outerOperation) { private volatile boolean completed = false; private final AtomicInteger runningCount = new AtomicInteger(); @Override public void onCompleted() { completed = true; if (runningCount.get() == 0) { o.onCompleted(); } } @Override public void onError(Throwable e) { o.onError(e); } @Override public void onNext(Observable innerObservable) { runningCount.incrementAndGet(); Subscriber i = new InnerObserver(); childrenSubscriptions.add(i); innerObservable.subscribe(i); } final class InnerObserver extends Subscriber { public InnerObserver() { } @Override public void onCompleted() { if (runningCount.decrementAndGet() == 0 && completed) { o.onCompleted(); } cleanup(); } @Override public void onError(Throwable e) { o.onError(e); cleanup(); } @Override public void onNext(T a) { o.onNext(a); } private void cleanup() { // remove subscription onCompletion so it cleans up immediately and doesn't memory leak // see https://github.com/Netflix/RxJava/issues/897 childrenSubscriptions.remove(this); } }; }; } }





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