EventMetric.java
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/*
* Copyright 2014-present Open Networking Laboratory
*
* 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 org.onlab.metrics;
import com.codahale.metrics.Gauge;
import com.codahale.metrics.Meter;
/**
* Metric measurements for events.
*/
public class EventMetric {
private static final String GAUGE_TIMESTAMP_NAME = "Timestamp.EpochMs";
private static final String METER_RATE_NAME = "Rate";
private final MetricsService metricsService;
private final String componentName;
private final String featureName;
private MetricsComponent metricsComponent;
private MetricsFeature metricsFeature;
private volatile long lastEventTimestampEpochMs = 0;
private Gauge<Long> lastEventTimestampGauge;
private Meter eventRateMeter;
/**
* Constructor.
*
* @param metricsService the Metrics Service to use for Metrics
* registration and deregistration
* @param componentName the Metrics Component Name to use for Metrics
* registration and deregistration
* @param featureName the Metrics Feature Name to use for Metrics
* registration and deregistration
*/
public EventMetric(MetricsService metricsService, String componentName,
String featureName) {
this.metricsService = metricsService;
this.componentName = componentName;
this.featureName = featureName;
}
/**
* Registers the metrics.
*/
public void registerMetrics() {
metricsComponent = metricsService.registerComponent(componentName);
metricsFeature = metricsComponent.registerFeature(featureName);
lastEventTimestampEpochMs = 0;
lastEventTimestampGauge =
metricsService.registerMetric(metricsComponent,
metricsFeature,
GAUGE_TIMESTAMP_NAME,
new Gauge<Long>() {
@Override
public Long getValue() {
return lastEventTimestampEpochMs;
}
});
eventRateMeter = metricsService.createMeter(metricsComponent,
metricsFeature,
METER_RATE_NAME);
}
/**
* Removes the metrics.
*/
public void removeMetrics() {
lastEventTimestampEpochMs = 0;
metricsService.removeMetric(metricsComponent,
metricsFeature,
GAUGE_TIMESTAMP_NAME);
metricsService.removeMetric(metricsComponent,
metricsFeature,
METER_RATE_NAME);
}
/**
* Updates the metric measurements for a single event.
*/
public void eventReceived() {
lastEventTimestampEpochMs = System.currentTimeMillis();
eventRateMeter.mark(1);
}
/**
* Gets the last event timestamp Gauge (ms from the Epoch).
*
* @return the last event timestamp Gauge (ms from the Epoch)
*/
public Gauge<Long> lastEventTimestampGauge() {
return lastEventTimestampGauge;
}
/**
* Gets the event rate meter.
*
* @return the event rate meter
*/
public Meter eventRateMeter() {
return eventRateMeter;
}
}