rx.internal.operators.OperatorDoOnRequest Maven / Gradle / Ivy
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/**
* 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 rx.*;
import rx.Observable.Operator;
import rx.functions.Action1;
/**
* This operator modifies an {@link rx.Observable} so a given action is invoked when the
* {@link rx.Producer} receives a request.
*
* @param
* The type of the elements in the {@link rx.Observable} that this operator modifies
*/
public class OperatorDoOnRequest implements Operator {
final Action1 request;
public OperatorDoOnRequest(Action1 request) {
this.request = request;
}
@Override
public Subscriber call(final Subscriber child) {
final ParentSubscriber parent = new ParentSubscriber(child);
child.setProducer(new Producer() {
@Override
public void request(long n) {
request.call(n);
parent.requestMore(n);
}
});
child.add(parent);
return parent;
}
static final class ParentSubscriber extends Subscriber {
private final Subscriber child;
ParentSubscriber(Subscriber child) {
this.child = child;
this.request(0);
}
private void requestMore(long n) {
request(n);
}
@Override
public void onCompleted() {
child.onCompleted();
}
@Override
public void onError(Throwable e) {
child.onError(e);
}
@Override
public void onNext(T t) {
child.onNext(t);
}
}
}