/*
* Copyright 2017 LinkedIn Corp.
*
* 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 azkaban.webapp;
import azkaban.metrics.MetricsManager;
import azkaban.metrics.MetricsUtility;
import com.codahale.metrics.Meter;
import com.codahale.metrics.MetricRegistry;
import java.util.concurrent.atomic.AtomicLong;
/**
* This singleton class WebMetrics is in charge of collecting varieties of metrics
* from azkaban-web-server modules.
*/
public enum WebMetrics {
INSTANCE;
private final MetricRegistry registry;
private final Meter webGetCall;
private final Meter webPostCall;
// How long does user log fetch take when user call fetch-log api.
private final AtomicLong logFetchLatency = new AtomicLong(0L);
WebMetrics() {
registry = MetricsManager.INSTANCE.getRegistry();
webGetCall = MetricsUtility.addMeter("Web-Get-Call-Meter", registry);
webPostCall = MetricsUtility.addMeter("Web-Post-Call-Meter", registry);
MetricsUtility.addGauge("fetchLogLatency", registry, logFetchLatency::get);
}
public void markWebGetCall() {
/*
* This method should be Thread Safe.
* Two reasons that we don't make this function call synchronized:
* 1). drop wizard metrics deals with concurrency internally;
* 2). mark is basically a math addition operation, which should not cause race condition issue.
*/
webGetCall.mark();
}
public void markWebPostCall() {
webPostCall.mark();
}
public void setFetchLogLatency(long milliseconds) {
logFetchLatency.set(milliseconds);
}
}