EventMetricCounters.java

package io.pcp.parfait.timing;

import io.pcp.parfait.MonitoredCounter;
import com.google.common.base.Preconditions;

/**
 * This class is a wrapper class which holds both a counter for an event metric and another
 * counter for the same metric but its value is a total value across all events. It is
 * important to ensure that the total counter is the same instance of the class across all
 * EventMetricCounters objects which are measuring the same metric.
 */
public class EventMetricCounters {
    private final MonitoredCounter eventSpecificCounter;
    private final MonitoredCounter totalCounter;

    public EventMetricCounters(MonitoredCounter eventSpecificCounter, MonitoredCounter totalCounter) {
        this.eventSpecificCounter = Preconditions.checkNotNull(eventSpecificCounter,
                "Cannot provide null event-specific metric counter");
        this.totalCounter = Preconditions.checkNotNull(totalCounter,
                "Cannot provide null total metric counter");
    }

    public void incrementCounters(long value) {
        eventSpecificCounter.inc(value);
        totalCounter.inc(value);

    }

    MonitoredCounter getTotalCounter() {
        return totalCounter;
    }

}