rx.internal.operators.OnSubscribeDefer Maven / Gradle / Ivy
/**
* 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.*;
import rx.Observable.OnSubscribe;
import rx.exceptions.Exceptions;
import rx.functions.Func0;
import rx.observers.Subscribers;
/**
* Do not create the Observable until an Observer subscribes; create a fresh Observable on each
* subscription.
*
* 
*
* Pass defer an Observable factory function (a function that generates Observables), and defer will
* return an Observable that will call this function to generate its Observable sequence afresh
* each time a new Observer subscribes.
* @param the value type
*/
public final class OnSubscribeDefer implements OnSubscribe {
final Func0> observableFactory;
public OnSubscribeDefer(Func0> observableFactory) {
this.observableFactory = observableFactory;
}
@Override
public void call(final Subscriber s) {
Observable o;
try {
o = observableFactory.call();
} catch (Throwable t) {
Exceptions.throwOrReport(t, s);
return;
}
o.unsafeSubscribe(Subscribers.wrap(s));
}
}