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// Copyright (C) 2015 The Android Open Source Project
//
// 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 com.google.gerrit.metrics.proc;
import com.google.common.base.Strings;
import com.google.common.base.Supplier;
import com.google.common.collect.ImmutableSet;
import com.google.gerrit.common.Version;
import com.google.gerrit.metrics.CallbackMetric;
import com.google.gerrit.metrics.CallbackMetric0;
import com.google.gerrit.metrics.CallbackMetric1;
import com.google.gerrit.metrics.Description;
import com.google.gerrit.metrics.Description.Units;
import com.google.gerrit.metrics.Field;
import com.google.gerrit.metrics.MetricMaker;
import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryUsage;
import java.lang.management.ThreadMXBean;
import java.util.concurrent.TimeUnit;
public class ProcMetricModule extends MetricModule {
@Override
protected void configure(MetricMaker metrics) {
buildLabel(metrics);
procUptime(metrics);
procCpuUsage(metrics);
procJvmGc(metrics);
procJvmMemory(metrics);
procJvmThread(metrics);
}
private void buildLabel(MetricMaker metrics) {
metrics.newConstantMetric(
"build/label",
Strings.nullToEmpty(Version.getVersion()),
new Description("Version of Gerrit server software"));
}
private void procUptime(MetricMaker metrics) {
metrics.newConstantMetric(
"proc/birth_timestamp",
Long.valueOf(TimeUnit.MILLISECONDS.toMicros(System.currentTimeMillis())),
new Description("Time at which the process started").setUnit(Units.MICROSECONDS));
metrics.newCallbackMetric(
"proc/uptime",
Long.class,
new Description("Uptime of this process").setUnit(Units.MILLISECONDS),
new Supplier<Long>() {
@Override
public Long get() {
return ManagementFactory.getRuntimeMXBean().getUptime();
}
});
}
private void procCpuUsage(MetricMaker metrics) {
final OperatingSystemMXBeanProvider provider = OperatingSystemMXBeanProvider.Factory.create();
if (provider == null) {
return;
}
if (provider.getProcessCpuTime() != -1) {
metrics.newCallbackMetric(
"proc/cpu/usage",
Double.class,
new Description("CPU time used by the process").setCumulative().setUnit(Units.SECONDS),
new Supplier<Double>() {
@Override
public Double get() {
return provider.getProcessCpuTime() / 1e9;
}
});
}
if (provider.getOpenFileDescriptorCount() != -1) {
metrics.newCallbackMetric(
"proc/num_open_fds",
Long.class,
new Description("Number of open file descriptors").setGauge().setUnit("fds"),
new Supplier<Long>() {
@Override
public Long get() {
return provider.getOpenFileDescriptorCount();
}
});
}
}
private void procJvmMemory(MetricMaker metrics) {
final CallbackMetric0<Long> heapCommitted =
metrics.newCallbackMetric(
"proc/jvm/memory/heap_committed",
Long.class,
new Description("Amount of memory guaranteed for user objects.")
.setGauge()
.setUnit(Units.BYTES));
final CallbackMetric0<Long> heapUsed =
metrics.newCallbackMetric(
"proc/jvm/memory/heap_used",
Long.class,
new Description("Amount of memory holding user objects.")
.setGauge()
.setUnit(Units.BYTES));
final CallbackMetric0<Long> nonHeapCommitted =
metrics.newCallbackMetric(
"proc/jvm/memory/non_heap_committed",
Long.class,
new Description("Amount of memory guaranteed for classes, etc.")
.setGauge()
.setUnit(Units.BYTES));
final CallbackMetric0<Long> nonHeapUsed =
metrics.newCallbackMetric(
"proc/jvm/memory/non_heap_used",
Long.class,
new Description("Amount of memory holding classes, etc.")
.setGauge()
.setUnit(Units.BYTES));
final CallbackMetric0<Integer> objectPendingFinalizationCount =
metrics.newCallbackMetric(
"proc/jvm/memory/object_pending_finalization_count",
Integer.class,
new Description("Approximate number of objects needing finalization.")
.setGauge()
.setUnit("objects"));
final MemoryMXBean memory = ManagementFactory.getMemoryMXBean();
metrics.newTrigger(
ImmutableSet.<CallbackMetric<?>>of(
heapCommitted, heapUsed, nonHeapCommitted, nonHeapUsed, objectPendingFinalizationCount),
new Runnable() {
@Override
public void run() {
try {
MemoryUsage stats = memory.getHeapMemoryUsage();
heapCommitted.set(stats.getCommitted());
heapUsed.set(stats.getUsed());
} catch (IllegalArgumentException e) {
// MXBean may throw due to a bug in Java 7; ignore.
}
MemoryUsage stats = memory.getNonHeapMemoryUsage();
nonHeapCommitted.set(stats.getCommitted());
nonHeapUsed.set(stats.getUsed());
objectPendingFinalizationCount.set(memory.getObjectPendingFinalizationCount());
}
});
}
private void procJvmGc(MetricMaker metrics) {
final CallbackMetric1<String, Long> gcCount =
metrics.newCallbackMetric(
"proc/jvm/gc/count",
Long.class,
new Description("Number of GCs").setCumulative(),
Field.ofString("gc_name", "The name of the garbage collector"));
final CallbackMetric1<String, Long> gcTime =
metrics.newCallbackMetric(
"proc/jvm/gc/time",
Long.class,
new Description("Approximate accumulated GC elapsed time")
.setCumulative()
.setUnit(Units.MILLISECONDS),
Field.ofString("gc_name", "The name of the garbage collector"));
metrics.newTrigger(
gcCount,
gcTime,
new Runnable() {
@Override
public void run() {
for (GarbageCollectorMXBean gc : ManagementFactory.getGarbageCollectorMXBeans()) {
long count = gc.getCollectionCount();
if (count != -1) {
gcCount.set(gc.getName(), count);
}
long time = gc.getCollectionTime();
if (time != -1) {
gcTime.set(gc.getName(), time);
}
}
}
});
}
private void procJvmThread(MetricMaker metrics) {
final ThreadMXBean thread = ManagementFactory.getThreadMXBean();
metrics.newCallbackMetric(
"proc/jvm/thread/num_live",
Integer.class,
new Description("Current live thread count").setGauge().setUnit("threads"),
new Supplier<Integer>() {
@Override
public Integer get() {
return thread.getThreadCount();
}
});
}
}
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