/*
* Copyright 2012-2017 the original author or authors.
*
* 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.springframework.boot.actuate.endpoint;
import java.lang.management.ClassLoadingMXBean;
import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryUsage;
import java.lang.management.ThreadMXBean;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.List;
import org.springframework.boot.actuate.metrics.Metric;
import org.springframework.core.Ordered;
import org.springframework.util.StringUtils;
/**
* A {@link PublicMetrics} implementation that provides various system-related metrics.
*
* @author Dave Syer
* @author Christian Dupuis
* @author Stephane Nicoll
* @author Johannes Edmeier
* @since 1.2.0
*/
public class SystemPublicMetrics implements PublicMetrics, Ordered {
private long timestamp;
public SystemPublicMetrics() {
this.timestamp = System.currentTimeMillis();
}
@Override
public int getOrder() {
return Ordered.HIGHEST_PRECEDENCE + 10;
}
@Override
public Collection<Metric<?>> metrics() {
Collection<Metric<?>> result = new LinkedHashSet<>();
addBasicMetrics(result);
addManagementMetrics(result);
return result;
}
/**
* Add basic system metrics.
* @param result the result
*/
protected void addBasicMetrics(Collection<Metric<?>> result) {
// NOTE: ManagementFactory must not be used here since it fails on GAE
Runtime runtime = Runtime.getRuntime();
result.add(newMemoryMetric("mem",
runtime.totalMemory() + getTotalNonHeapMemoryIfPossible()));
result.add(newMemoryMetric("mem.free", runtime.freeMemory()));
result.add(new Metric<>("processors", runtime.availableProcessors()));
result.add(new Metric<>("instance.uptime",
System.currentTimeMillis() - this.timestamp));
}
private long getTotalNonHeapMemoryIfPossible() {
try {
return ManagementFactory.getMemoryMXBean().getNonHeapMemoryUsage().getUsed();
}
catch (Throwable ex) {
return 0;
}
}
/**
* Add metrics from ManagementFactory if possible. Note that ManagementFactory is not
* available on Google App Engine.
* @param result the result
*/
private void addManagementMetrics(Collection<Metric<?>> result) {
try {
// Add JVM up time in ms
result.add(new Metric<>("uptime",
ManagementFactory.getRuntimeMXBean().getUptime()));
result.add(new Metric<>("systemload.average",
ManagementFactory.getOperatingSystemMXBean().getSystemLoadAverage()));
addHeapMetrics(result);
addNonHeapMetrics(result);
addThreadMetrics(result);
addClassLoadingMetrics(result);
addGarbageCollectionMetrics(result);
}
catch (NoClassDefFoundError ex) {
// Expected on Google App Engine
}
}
/**
* Add JVM heap metrics.
* @param result the result
*/
protected void addHeapMetrics(Collection<Metric<?>> result) {
MemoryUsage memoryUsage = ManagementFactory.getMemoryMXBean()
.getHeapMemoryUsage();
result.add(newMemoryMetric("heap.committed", memoryUsage.getCommitted()));
result.add(newMemoryMetric("heap.init", memoryUsage.getInit()));
result.add(newMemoryMetric("heap.used", memoryUsage.getUsed()));
result.add(newMemoryMetric("heap", memoryUsage.getMax()));
}
/**
* Add JVM non-heap metrics.
* @param result the result
*/
private void addNonHeapMetrics(Collection<Metric<?>> result) {
MemoryUsage memoryUsage = ManagementFactory.getMemoryMXBean()
.getNonHeapMemoryUsage();
result.add(newMemoryMetric("nonheap.committed", memoryUsage.getCommitted()));
result.add(newMemoryMetric("nonheap.init", memoryUsage.getInit()));
result.add(newMemoryMetric("nonheap.used", memoryUsage.getUsed()));
result.add(newMemoryMetric("nonheap", memoryUsage.getMax()));
}
private Metric<Long> newMemoryMetric(String name, long bytes) {
return new Metric<>(name, bytes / 1024);
}
/**
* Add thread metrics.
* @param result the result
*/
protected void addThreadMetrics(Collection<Metric<?>> result) {
ThreadMXBean threadMxBean = ManagementFactory.getThreadMXBean();
result.add(
new Metric<>("threads.peak", (long) threadMxBean.getPeakThreadCount()));
result.add(new Metric<>("threads.daemon",
(long) threadMxBean.getDaemonThreadCount()));
result.add(new Metric<>("threads.totalStarted",
threadMxBean.getTotalStartedThreadCount()));
result.add(new Metric<>("threads", (long) threadMxBean.getThreadCount()));
}
/**
* Add class loading metrics.
* @param result the result
*/
protected void addClassLoadingMetrics(Collection<Metric<?>> result) {
ClassLoadingMXBean classLoadingMxBean = ManagementFactory.getClassLoadingMXBean();
result.add(
new Metric<>("classes", (long) classLoadingMxBean.getLoadedClassCount()));
result.add(new Metric<>("classes.loaded",
classLoadingMxBean.getTotalLoadedClassCount()));
result.add(new Metric<>("classes.unloaded",
classLoadingMxBean.getUnloadedClassCount()));
}
/**
* Add garbage collection metrics.
* @param result the result
*/
protected void addGarbageCollectionMetrics(Collection<Metric<?>> result) {
List<GarbageCollectorMXBean> garbageCollectorMxBeans = ManagementFactory
.getGarbageCollectorMXBeans();
for (GarbageCollectorMXBean garbageCollectorMXBean : garbageCollectorMxBeans) {
String name = beautifyGcName(garbageCollectorMXBean.getName());
result.add(new Metric<>("gc." + name + ".count",
garbageCollectorMXBean.getCollectionCount()));
result.add(new Metric<>("gc." + name + ".time",
garbageCollectorMXBean.getCollectionTime()));
}
}
/**
* Turn GC names like 'PS Scavenge' or 'PS MarkSweep' into something that is more
* metrics friendly.
* @param name the source name
* @return a metric friendly name
*/
private String beautifyGcName(String name) {
return StringUtils.replace(name, " ", "_").toLowerCase();
}
}