/**
* 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.util;
import rx.Observable;
import rx.Subscriber;
public final class ScalarSynchronousObservable<T> extends Observable<T> {
public static final <T> ScalarSynchronousObservable<T> create(T t) {
return new ScalarSynchronousObservable<T>(t);
}
private final T t;
protected ScalarSynchronousObservable(final T t) {
super(new OnSubscribe<T>() {
@Override
public void call(Subscriber<? super T> s) {
/*
* We don't check isUnsubscribed as it is a significant performance impact in the fast-path use cases.
* See PerfBaseline tests and https://github.com/Netflix/RxJava/issues/1383 for more information.
* The assumption here is that when asking for a single item we should emit it and not concern ourselves with
* being unsubscribed already. If the Subscriber unsubscribes at 0, they shouldn't have subscribed, or it will
* filter it out (such as take(0)). This prevents us from paying the price on every subscription.
*/
s.onNext(t);
s.onCompleted();
}
});
this.t = t;
}
public T get() {
return t;
}
}