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rxjava-core developed by Netflix
/**
* 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 rx.Observable;
import rx.Observable.OnSubscribeFunc;
import rx.Observer;
import rx.Subscription;
import rx.functions.Func0;
import rx.functions.Func1;
import rx.subscriptions.CompositeSubscription;
import rx.subscriptions.Subscriptions;
/**
* Constructs an observable sequence that depends on a resource object.
*/
public class OperationUsing {
public static OnSubscribeFunc using(
final Func0 resourceFactory,
final Func1> observableFactory) {
return new OnSubscribeFunc() {
@Override
public Subscription onSubscribe(Observer super T> observer) {
Subscription resourceSubscription = Subscriptions.empty();
try {
RESOURCE resource = resourceFactory.call();
if (resource != null) {
resourceSubscription = resource;
}
Observable observable = observableFactory.call(resource);
SafeObservableSubscription subscription = new SafeObservableSubscription();
// Use SafeObserver to guarantee resourceSubscription will
// be unsubscribed.
return subscription.wrap(new CompositeSubscription(
observable.subscribe(new SafeObserver(
subscription, observer)),
resourceSubscription));
} catch (Throwable e) {
resourceSubscription.unsubscribe();
return Observable. error(e).subscribe(observer);
}
}
};
}
}
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