rx.internal.operators.OperatorTakeLastTimed Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of rxjava Show documentation
rxjava
There is a newer version: 1.3.8
/**
 * 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.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;

import rx.*;
import rx.Observable.Operator;
import rx.functions.Func1;

/**
 * Returns an Observable that emits the last count items emitted by the source Observable.
 * 
 * 
 *
 * @param  the value type
 */
public final class OperatorTakeLastTimed implements Operator {

    final long ageMillis;
    final Scheduler scheduler;
    final int count;

    public OperatorTakeLastTimed(long time, TimeUnit unit, Scheduler scheduler) {
        this.ageMillis = unit.toMillis(time);
        this.scheduler = scheduler;
        this.count = -1;
    }

    public OperatorTakeLastTimed(int count, long time, TimeUnit unit, Scheduler scheduler) {
        if (count < 0) {
            throw new IndexOutOfBoundsException("count could not be negative");
        }
        this.ageMillis = unit.toMillis(time);
        this.scheduler = scheduler;
        this.count = count;
    }

    @Override
    public Subscriber call(final Subscriber subscriber) {
        final TakeLastTimedSubscriber parent = new TakeLastTimedSubscriber(subscriber, count, ageMillis, scheduler);

        subscriber.add(parent);
        subscriber.setProducer(new Producer() {
            @Override
            public void request(long n) {
                parent.requestMore(n);
            }
        });

        return parent;
    }

    static final class TakeLastTimedSubscriber extends Subscriber implements Func1 {
        final Subscriber actual;
        final long ageMillis;
        final Scheduler scheduler;
        final int count;
        final AtomicLong requested;
        final ArrayDeque