rx.internal.operators.OperatorSkipLastTimed 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 java.util.ArrayDeque;
import java.util.Deque;
import java.util.concurrent.TimeUnit;
import rx.Observable.Operator;
import rx.Scheduler;
import rx.Subscriber;
import rx.schedulers.Timestamped;
/**
* Skip delivering values in the time window before the values.
*/
public class OperatorSkipLastTimed implements Operator {
private final long timeInMillis;
private final Scheduler scheduler;
public OperatorSkipLastTimed(long time, TimeUnit unit, Scheduler scheduler) {
this.timeInMillis = unit.toMillis(time);
this.scheduler = scheduler;
}
@Override
public Subscriber call(final Subscriber subscriber) {
return new Subscriber(subscriber) {
private Deque> buffer = new ArrayDeque>();
private void emitItemsOutOfWindow(long now) {
long limit = now - timeInMillis;
while (!buffer.isEmpty()) {
Timestamped v = buffer.getFirst();
if (v.getTimestampMillis() < limit) {
buffer.removeFirst();
subscriber.onNext(v.getValue());
} else {
break;
}
}
}
@Override
public void onNext(T value) {
long now = scheduler.now();
emitItemsOutOfWindow(now);
buffer.offerLast(new Timestamped(now, value));
}
@Override
public void onError(Throwable e) {
subscriber.onError(e);
}
@Override
public void onCompleted() {
emitItemsOutOfWindow(scheduler.now());
subscriber.onCompleted();
}
};
}
}