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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.Future;
import java.util.concurrent.TimeUnit;

import rx.Observable.OnSubscribeFunc;
import rx.Observer;
import rx.Subscription;
import rx.subscriptions.Subscriptions;

/**
 * Converts a Future into an Observable.
 * 

* *

* You can convert any object that supports the Future interface into an Observable that emits the * return value of the get() method of that object, by using the from operation. *

* This is blocking so the Subscription returned when calling * Observable.subscribe(Observer) does nothing. */ public class OperationToObservableFuture { /* package accessible for unit tests */static class ToObservableFuture implements OnSubscribeFunc { private final Future that; private final Long time; private final TimeUnit unit; public ToObservableFuture(Future that) { this.that = that; this.time = null; this.unit = null; } public ToObservableFuture(Future that, long time, TimeUnit unit) { this.that = that; this.time = time; this.unit = unit; } @Override public Subscription onSubscribe(Observer observer) { try { T value = (time == null) ? (T) that.get() : (T) that.get(time, unit); if (!that.isCancelled()) { observer.onNext(value); } observer.onCompleted(); } catch (Throwable e) { observer.onError(e); } // the get() has already completed so there is no point in // giving the user a way to cancel. return Subscriptions.empty(); } } public static OnSubscribeFunc toObservableFuture(final Future that) { return new ToObservableFuture(that); } public static OnSubscribeFunc toObservableFuture(final Future that, long time, TimeUnit unit) { return new ToObservableFuture(that, time, unit); } }





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