io.mantisrx.common.metrics.rx.MonitorOperator 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.mantisrx.common.metrics.rx;
import io.mantisrx.common.metrics.Counter;
import io.mantisrx.common.metrics.Gauge;
import io.mantisrx.common.metrics.Metrics;
import io.mantisrx.common.metrics.MetricsRegistry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import rx.Observable.Operator;
import rx.Subscriber;
import rx.functions.Action0;
import rx.subscriptions.Subscriptions;
public class MonitorOperator implements Operator {
private static Logger logger = LoggerFactory.getLogger(MonitorOperator.class);
private final Counter next;
private final Gauge nextGauge;
private final Gauge error;
private final Gauge complete;
private final Gauge subscribe;
private String name;
public MonitorOperator(String name) {
this.name = name;
Metrics m =
new Metrics.Builder()
.name(name)
.addCounter("onNext")
.addGauge("onError")
.addGauge("onComplete")
.addGauge("subscribe")
.addGauge("onNextGauge")
.build();
m = MetricsRegistry.getInstance().registerAndGet(m);
next = m.getCounter("onNext");
error = m.getGauge("onError");
complete = m.getGauge("onComplete");
subscribe = m.getGauge("subscribe");
nextGauge = m.getGauge("onNextGauge");
}
@Override
public Subscriber call(final Subscriber o) {
subscribe.increment();
o.add(Subscriptions.create(new Action0() {
@Override
public void call() {
subscribe.decrement();
}
}));
return new Subscriber(o) {
@Override
public void onCompleted() {
logger.debug("onCompleted() called for monitored observable with name: " + name);
complete.increment();
o.onCompleted();
}
@Override
public void onError(Throwable e) {
logger.error("onError() called for monitored observable with name: " + name, e);
error.increment();
o.onError(e);
}
@Override
public void onNext(T t) {
next.increment();
nextGauge.set(next.value());
o.onNext(t);
}
};
}
}