rx.internal.operators.OperatorWithLatestFrom Maven / Gradle / Ivy
The newest version!
/**
* 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.atomic.AtomicReference;
import rx.*;
import rx.Observable.Operator;
import rx.exceptions.Exceptions;
import rx.functions.Func2;
import rx.observers.SerializedSubscriber;
/**
* Combines values from two sources only when the main source emits.
* @param the element type of the main observable
* @param the element type of the other observable that is merged into the main
* @param the result element type
*/
public final class OperatorWithLatestFrom implements Operator {
final Func2 resultSelector;
final Observable other;
/** Indicates the other has not yet emitted a value. */
static final Object EMPTY = new Object();
public OperatorWithLatestFrom(Observable other, Func2 resultSelector) {
this.other = other;
this.resultSelector = resultSelector;
}
@Override
public Subscriber call(Subscriber child) {
// onError and onCompleted may happen either from the main or from other.
final SerializedSubscriber s = new SerializedSubscriber(child, false);
child.add(s);
final AtomicReference