rx.internal.operators.OperatorSampleWithTime 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.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import rx.*;
import rx.Observable.Operator;
import rx.Scheduler.Worker;
import rx.exceptions.Exceptions;
import rx.functions.Action0;
import rx.observers.SerializedSubscriber;
/**
* Returns an Observable that emits the results of sampling the items emitted by the source
* Observable at a specified time interval.
*
*
*
* @param the value type
*/
public final class OperatorSampleWithTime implements Operator {
final long time;
final TimeUnit unit;
final Scheduler scheduler;
public OperatorSampleWithTime(long time, TimeUnit unit, Scheduler scheduler) {
this.time = time;
this.unit = unit;
this.scheduler = scheduler;
}
@Override
public Subscriber super T> call(Subscriber super T> child) {
final SerializedSubscriber s = new SerializedSubscriber(child);
final Worker worker = scheduler.createWorker();
child.add(worker);
SamplerSubscriber sampler = new SamplerSubscriber(s);
child.add(sampler);
worker.schedulePeriodically(sampler, time, time, unit);
return sampler;
}
/**
* The source subscriber and sampler.
*/
static final class SamplerSubscriber extends Subscriber implements Action0 {
private final Subscriber super T> subscriber;
/** Indicates that no value is available. */
private static final Object EMPTY_TOKEN = new Object();
/** The shared value between the observer and the timed action. */
final AtomicReference