/**
* 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.internal.operators;
import rx.Observable;
import rx.Observable.OnSubscribe;
import rx.Subscriber;
import rx.Subscription;
import rx.functions.Func0;
import rx.functions.Func1;
/**
* Constructs an observable sequence that depends on a resource object.
*/
public final class OnSubscribeUsing<T, Resource extends Subscription> implements OnSubscribe<T> {
private final Func0<Resource> resourceFactory;
private final Func1<Resource, ? extends Observable<? extends T>> observableFactory;
public OnSubscribeUsing(Func0<Resource> resourceFactory, Func1<Resource, ? extends Observable<? extends T>> observableFactory) {
this.resourceFactory = resourceFactory;
this.observableFactory = observableFactory;
}
public void call(Subscriber<? super T> subscriber) {
Resource resource = null;
try {
resource = resourceFactory.call();
subscriber.add(resource);
Observable<? extends T> observable = observableFactory.call(resource);
observable.subscribe(subscriber);
} catch (Throwable e) {
if (resource != null) {
resource.unsubscribe();
}
subscriber.onError(e);
}
}
}