/**
* 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 java.util.concurrent.
TimeUnit;
import rx.*;
import rx.
Observable.
Operator;
import rx.
Scheduler.
Worker;
import rx.functions.
Action0;
/**
* Delays the emission of onNext events by a given amount of time.
*
* @param <T>
* the value type
*/
public final class
OperatorDelay<T> implements
Operator<T, T> {
final long
delay;
final
TimeUnit unit;
final
Scheduler scheduler;
public
OperatorDelay(long
delay,
TimeUnit unit,
Scheduler scheduler) {
this.
delay =
delay;
this.
unit =
unit;
this.
scheduler =
scheduler;
}
@
Override
public
Subscriber<? super T>
call(final
Subscriber<? super T>
child) {
final
Worker worker =
scheduler.
createWorker();
child.
add(
worker);
return new
Subscriber<T>(
child) {
// indicates an error cut ahead
// accessed from the worker thread only
boolean
done;
@
Override
public void
onCompleted() {
worker.
schedule(new
Action0() {
@
Override
public void
call() {
if (!
done) {
done = true;
child.
onCompleted();
}
}
},
delay,
unit);
}
@
Override
public void
onError(final
Throwable e) {
worker.
schedule(new
Action0() {
@
Override
public void
call() {
if (!
done) {
done = true;
child.
onError(
e);
worker.
unsubscribe();
}
}
});
}
@
Override
public void
onNext(final T
t) {
worker.
schedule(new
Action0() {
@
Override
public void
call() {
if (!
done) {
child.
onNext(
t);
}
}
},
delay,
unit);
}
};
}
}