io.reactivx.mantis.operators.DoOnRequestOperator Maven / Gradle / Ivy
/*
* Copyright 2019 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 io.reactivx.mantis.operators;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import rx.Observable.Operator;
import rx.Producer;
import rx.Subscriber;
public class DoOnRequestOperator implements Operator {
private static final Logger logger = LoggerFactory.getLogger(DoOnRequestOperator.class);
private final String name;
public DoOnRequestOperator(String name) {
this.name = name;
}
@Override
public Subscriber call(Subscriber child) {
final RequestSubscriber requestSubscriber = new RequestSubscriber(child);
child.setProducer(new Producer() {
@Override
public void request(long n) {
if (n > 10000) {
logger.info("DoOnRequest + " + name + " Requested------>: " + n);
}
requestSubscriber.requestMore(n);
}
});
return requestSubscriber;
}
static class RequestSubscriber extends Subscriber {
final Subscriber child;
boolean once = false;
public RequestSubscriber(Subscriber child) {
super(child);
this.child = child;
}
@Override
public void onStart() {
if (!once) {
// don't request anything until the child requests via requestMore
request(0);
}
}
void requestMore(long n) {
once = true;
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);
}
}
}