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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.jdisc.metric;
import com.google.inject.Inject;
import com.yahoo.component.AbstractComponent;
import com.yahoo.jdisc.Metric;
import com.yahoo.jdisc.statistics.ActiveContainerMetrics;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Timer;
import java.util.TimerTask;
/**
* Uses a timer to emit metrics
*
* @author vegardh
* @since 5.17
*
*/
public class MetricUpdater extends AbstractComponent {
@Deprecated private static final String DEPRECATED_FREE_MEMORY_BYTES = "freeMemoryBytes";
@Deprecated private static final String DEPRECATED_USED_MEMORY_BYTES = "usedMemoryBytes";
@Deprecated private static final String DEPRECATED_TOTAL_MEMORY_BYTES = "totalMemoryBytes";
private static final String FREE_MEMORY_BYTES = "mem.heap.free";
private static final String USED_MEMORY_BYTES = "mem.heap.used";
private static final String TOTAL_MEMORY_BYTES = "mem.heap.total";
private static final String MEMORY_MAPPINGS_COUNT = "jdisc.memory_mappings";
private static final String OPEN_FILE_DESCRIPTORS = "jdisc.open_file_descriptors";
private final Metric metric;
private final ActiveContainerMetrics activeContainerMetrics;
private final Timer timer = new Timer();
long freeMemory = -1;
long totalMemory = -1;
@Inject
public MetricUpdater(Metric metric, ActiveContainerMetrics activeContainerMetrics) {
this(metric, activeContainerMetrics, 10*1000);
}
public MetricUpdater(Metric metric, ActiveContainerMetrics activeContainerMetrics, long delayMillis) {
this.metric = metric;
this.activeContainerMetrics = activeContainerMetrics;
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 {
@SuppressWarnings("deprecation")
@Override
public void run() {
freeMemory = Runtime.getRuntime().freeMemory();
totalMemory = Runtime.getRuntime().totalMemory();
long usedMemory = totalMemory - freeMemory;
metric.set(DEPRECATED_FREE_MEMORY_BYTES, freeMemory, null);
metric.set(DEPRECATED_USED_MEMORY_BYTES, usedMemory, null);
metric.set(DEPRECATED_TOTAL_MEMORY_BYTES, totalMemory, null);
metric.set(FREE_MEMORY_BYTES, freeMemory, null);
metric.set(USED_MEMORY_BYTES, usedMemory, null);
metric.set(TOTAL_MEMORY_BYTES, totalMemory, null);
metric.set(MEMORY_MAPPINGS_COUNT, count_mappings(), null);
metric.set(OPEN_FILE_DESCRIPTORS, count_open_files(), null);
activeContainerMetrics.emitMetrics(metric);
}
// Note: Linux-specific
private long count_mappings() {
long count = 0;
try {
Path p = Paths.get("/proc/self/maps");
byte[] data = Files.readAllBytes(p);
for (byte b : data) {
if (b == '\n') {
++count;
}
}
} catch (Exception e) {
System.err.println("Could not read /proc/self/maps: " + e);
}
return count;
}
// Note: Linux-specific
private long count_open_files() {
long count = 0;
try {
Path p = Paths.get("/proc/self/fd");
try (DirectoryStream<Path> stream = Files.newDirectoryStream(p)) {
for (Path entry : stream) {
++count;
}
}
} catch (Exception e) {
System.err.println("Could not read /proc/self/fd: " + e);
}
return count;
}
}
}
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