/**
* 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 <T>
* The type of the elements in the {@link rx.Observable} that this operator modifies
*/
public class
OperatorDoOnRequest<T> implements
Operator<T, T> {
final
Action1<? super
Long>
request;
public
OperatorDoOnRequest(
Action1<? super
Long>
request) {
this.
request =
request;
}
@
Override
public
Subscriber<? super T>
call(final
Subscriber<? super T>
child) {
final
ParentSubscriber<T>
parent = new
ParentSubscriber<T>(
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<T> extends
Subscriber<T> {
private final
Subscriber<? super T>
child;
ParentSubscriber(
Subscriber<? super T>
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);
}
}
}