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/*
* Copyright 2015 Netflix, Inc.
*
* 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.netflix.servo.publish.tomcat;
import com.netflix.servo.Metric;
import com.netflix.servo.annotations.DataSourceType;
import com.netflix.servo.monitor.MonitorConfig;
import com.netflix.servo.publish.BaseMetricPoller;
import com.netflix.servo.tag.BasicTagList;
import com.netflix.servo.tag.Tag;
import com.netflix.servo.tag.TagList;
import com.netflix.servo.tag.Tags;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.management.Attribute;
import javax.management.AttributeList;
import javax.management.JMException;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import java.lang.management.ManagementFactory;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
/**
* Fetch Tomcat metrics from JMX.
*/
public class TomcatPoller extends BaseMetricPoller {
private static final List EMPTY_LIST = Collections.emptyList();
private static final Logger LOGGER = LoggerFactory.getLogger(TomcatPoller.class);
private static String normalizeName(String name) {
return "tomcat." + ("activeCount".equals(name) ? "currentThreadsBusy" : name);
}
private static Metric toMetric(long t, ObjectName name, Attribute attribute, Tag dsType) {
Tag id = Tags.newTag("id", name.getKeyProperty("name"));
Tag clazz = Tags.newTag("class", name.getKeyProperty("type"));
TagList list = BasicTagList.of(id, clazz, dsType);
return new Metric(normalizeName(attribute.getName()), list, t, attribute.getValue());
}
private static Metric toGauge(long t, ObjectName name, Attribute attribute) {
return toMetric(t, name, attribute, DataSourceType.GAUGE);
}
private static Metric toCounter(long t, ObjectName name, Attribute attribute) {
return toMetric(t, name, attribute, DataSourceType.COUNTER);
}
private static final String[] THREAD_POOL_ATTRS = new String[]{
"maxThreads",
"currentThreadCount",
"currentThreadsBusy",
"backlog"
};
private static final String[] GLOBAL_REQ_ATTRS = new String[]{
"requestCount",
"errorCount",
"bytesSent",
"bytesReceived",
"processingTime",
"maxTime"
};
private static final String[] EXECUTOR_ATTRS = new String[]{
"maxThreads",
"completedTaskCount",
"queueSize",
"poolSize",
"activeCount"
};
private static void addMetric(List metrics, Metric metric) {
if (metric.getNumberValue().doubleValue() >= 0.0) {
final MonitorConfig c = metric.getConfig();
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Adding " + c.getName() + " " + c.getTags() + " "
+ metric.getNumberValue());
}
metrics.add(metric);
} else {
LOGGER.debug("Ignoring {}", metric);
}
}
private static void fetchRequestProcessorMetrics(long now, MBeanServer mbs,
List metrics) throws JMException {
final ObjectName globalName = new ObjectName("Catalina:type=GlobalRequestProcessor,*");
final Set names = mbs.queryNames(globalName, null);
if (names == null) {
return;
}
for (ObjectName name : names) {
AttributeList list = mbs.getAttributes(name, GLOBAL_REQ_ATTRS);
for (Attribute a : list.asList()) {
// the only gauge here is maxTime
addMetric(metrics, a.getName().equals("maxTime")
? toGauge(now, name, a)
: toCounter(now, name, a));
}
}
}
private static void fetchThreadPoolMetrics(long now, MBeanServer mbs, List metrics)
throws JMException {
final ObjectName threadPoolName = new ObjectName("Catalina:type=ThreadPool,*");
final Set names = mbs.queryNames(threadPoolName, null);
if (names == null) {
return;
}
for (ObjectName name : names) {
AttributeList list = mbs.getAttributes(name, THREAD_POOL_ATTRS);
// determine whether the shared threadPool is used
boolean isUsed = true;
for (Attribute a : list.asList()) {
if (a.getName().equals("maxThreads")) {
Number v = (Number) a.getValue();
isUsed = v.doubleValue() >= 0.0;
break;
}
}
if (isUsed) {
// only add the attributes if the metric is used.
for (Attribute a : list.asList()) {
addMetric(metrics, toGauge(now, name, a));
}
}
}
}
private static void fetchExecutorMetrics(long now, MBeanServer mbs, List metrics)
throws JMException {
final ObjectName executorName = new ObjectName("Catalina:type=Executor,*");
final Set names = mbs.queryNames(executorName, null);
if (names == null) {
return;
}
for (ObjectName name : names) {
AttributeList list = mbs.getAttributes(name, EXECUTOR_ATTRS);
for (Attribute a : list.asList()) {
addMetric(metrics, a.getName().equals("completedTaskCount")
? toCounter(now, name, a)
: toGauge(now, name, a));
}
}
}
List pollImpl(long timestamp) {
try {
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
List metrics = new ArrayList<>();
fetchThreadPoolMetrics(timestamp, mbs, metrics);
fetchRequestProcessorMetrics(timestamp, mbs, metrics);
fetchExecutorMetrics(timestamp, mbs, metrics);
return metrics;
} catch (JMException e) {
logger.error("Could not get Tomcat JMX metrics", e);
return EMPTY_LIST;
}
}
/**
* {@inheritDoc}
*/
@Override
public List pollImpl(boolean reset) {
return pollImpl(System.currentTimeMillis());
}
}
