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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.jdisc.metric;
import java.util.Timer;
import java.util.TimerTask;
import com.google.inject.Inject;
import com.yahoo.component.AbstractComponent;
import com.yahoo.jdisc.Metric;
/**
* Uses a timer to emit metrics
*
* @author vegardh
* @since 5.17
*
*/
public class MetricUpdater extends AbstractComponent {
private static final String FREE_MEMORY_BYTES = "freeMemoryBytes";
private static final String USED_MEMORY_BYTES = "usedMemoryBytes";
private static final String TOTAL_MEMORY_BYTES = "totalMemoryBytes";
private static final String MANHATTAN_FREE_MEMORY_BYTES = "mem.heap.free";
private static final String MANHATTAN_USED_MEMORY_BYTES = "mem.heap.used";
private static final String MANHATTAN_TOTAL_MEMORY_BYTES = "mem.heap.total";
private final Metric metric;
private final Timer timer = new Timer();
long freeMemory = -1;
long totalMemory = -1;
@Inject
public MetricUpdater(Metric metric) {
this(metric, 10*1000);
}
public MetricUpdater(Metric metric, long delayMillis) {
this.metric = metric;
timer.schedule(new UpdaterTask(), delayMillis, delayMillis);
}
@Override
public void deconstruct() {
if (timer!=null) timer.cancel();
}
// For testing
long getFreeMemory() { return freeMemory; }
long getTotalMemory() { return totalMemory; }
private class UpdaterTask extends TimerTask {
@Override
public void run() {
freeMemory = Runtime.getRuntime().freeMemory();
totalMemory = Runtime.getRuntime().totalMemory();
long usedMemory = totalMemory - freeMemory;
metric.set(FREE_MEMORY_BYTES, freeMemory, null);
metric.set(USED_MEMORY_BYTES, usedMemory, null);
metric.set(TOTAL_MEMORY_BYTES, totalMemory, null);
metric.set(MANHATTAN_FREE_MEMORY_BYTES, freeMemory, null);
metric.set(MANHATTAN_USED_MEMORY_BYTES, usedMemory, null);
metric.set(MANHATTAN_TOTAL_MEMORY_BYTES, totalMemory, null);
}
}
}
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