io.reactivx.mantis.operators.DropOperator Maven / Gradle / Ivy
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/*
* 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 com.netflix.spectator.api.Tag;
import io.mantisrx.common.metrics.Counter;
import io.mantisrx.common.metrics.Metrics;
import io.mantisrx.common.metrics.MetricsRegistry;
import io.mantisrx.common.metrics.spectator.MetricGroupId;
import java.util.concurrent.atomic.AtomicLong;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import rx.Observable.Operator;
import rx.Producer;
import rx.Subscriber;
import rx.subscriptions.Subscriptions;
public class DropOperator implements Operator {
public static final String METRIC_GROUP = "DropOperator";
private static final Logger logger = LoggerFactory.getLogger(DropOperator.class);
private final Counter next;
private final Counter error;
private final Counter complete;
private final Counter dropped;
MetricGroupId metricGroupId;
public DropOperator(final Metrics m) {
next = m.getCounter("" + Counters.onNext);
error = m.getCounter("" + Counters.onError);
complete = m.getCounter("" + Counters.onComplete);
dropped = m.getCounter("" + Counters.dropped);
}
public DropOperator(final MetricGroupId groupId) {
this.metricGroupId = groupId;
Metrics m = new Metrics.Builder()
.id(metricGroupId)
.addCounter("" + Counters.onNext)
.addCounter("" + Counters.onError)
.addCounter("" + Counters.onComplete)
.addCounter("" + Counters.dropped)
.build();
m = MetricsRegistry.getInstance().registerAndGet(m);
next = m.getCounter("" + Counters.onNext);
error = m.getCounter("" + Counters.onError);
complete = m.getCounter("" + Counters.onComplete);
dropped = m.getCounter("" + Counters.dropped);
}
public DropOperator(final String name) {
this(new MetricGroupId(METRIC_GROUP + "_" + name));
}
public DropOperator(final String name, final Tag... tags) {
this(new MetricGroupId(METRIC_GROUP + "_" + name, tags));
}
@Override
public Subscriber call(final Subscriber o) {
final AtomicLong requested = new AtomicLong();
o.add(Subscriptions.create(() -> {
}));
o.setProducer(new Producer() {
@Override
public void request(long n) {
if (requested.get() == Long.MAX_VALUE) {
logger.warn("current requested is int max do not increment");
} else {
requested.getAndAdd(n);
}
}
});
return new Subscriber(o) {
@Override
public void onCompleted() {
complete.increment();
o.onCompleted();
}
@Override
public void onError(Throwable e) {
error.increment();
logger.error("onError() occured in DropOperator for groupId: {}", metricGroupId.id(), e);
o.onError(e);
}
@Override
public void onNext(T t) {
if (requested.get() > 0) {
requested.decrementAndGet();
o.onNext(t);
next.increment();
} else {
dropped.increment();
}
}
@Override
public void setProducer(Producer p) {
p.request(Long.MAX_VALUE);
}
};
}
public enum Counters {
onNext,
onError,
onComplete,
dropped
}
public enum Gauges {
subscribe,
requested
}
}