/**
* Copyright (C) 2012-2014 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 ninja.metrics;
import java.io.Closeable;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import ninja.lifecycle.Dispose;
import ninja.lifecycle.Start;
import ninja.utils.NinjaConstant;
import ninja.utils.NinjaProperties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import ch.qos.logback.classic.LoggerContext;
import com.codahale.metrics.JmxReporter;
import com.codahale.metrics.Metric;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.MetricSet;
import com.codahale.metrics.jvm.ClassLoadingGaugeSet;
import com.codahale.metrics.jvm.GarbageCollectorMetricSet;
import com.codahale.metrics.jvm.MemoryUsageGaugeSet;
import com.codahale.metrics.jvm.ThreadStatesGaugeSet;
import com.codahale.metrics.logback.InstrumentedAppender;
import com.google.common.base.Strings;
import com.google.inject.Inject;
import com.google.inject.Singleton;
/**
* Implementation of the Metrics service.
*
* @author James Moger
*/
@Singleton
public class MetricsServiceImpl implements MetricsService {
private final Logger log = LoggerFactory.getLogger(MetricsService.class);
private final NinjaProperties ninjaProps;
private final MetricRegistry metricRegistry;
private final List<Closeable> reporters;
@Inject
public MetricsServiceImpl(MetricRegistry appMetrics,
NinjaProperties ninjaProps) {
this.ninjaProps = ninjaProps;
this.metricRegistry = appMetrics;
this.reporters = new ArrayList<>();
}
@Start(order = 10)
@Override
public void start() {
String applicationName = ninjaProps.getWithDefault(
NinjaConstant.applicationName, "Ninja");
/*
* Register optional metrics
*/
if (ninjaProps.getBooleanWithDefault("metrics.jvm.enabled", false)) {
registerAll("jvm.gc", new GarbageCollectorMetricSet());
registerAll("jvm.memory", new MemoryUsageGaugeSet());
registerAll("jvm.threads", new ThreadStatesGaugeSet());
registerAll("jvm.classes", new ClassLoadingGaugeSet());
log.debug("Registered JVM-Metrics integration");
}
if (ninjaProps.getBooleanWithDefault("metrics.logback.enabled", false)) {
final LoggerContext factory = (LoggerContext) LoggerFactory.getILoggerFactory();
final ch.qos.logback.classic.Logger root = factory.getLogger(Logger.ROOT_LOGGER_NAME);
final InstrumentedAppender appender = new InstrumentedAppender(metricRegistry);
appender.setContext(root.getLoggerContext());
appender.start();
root.addAppender(appender);
log.debug("Registered Logback-Metrics integration");
}
/*
* MBeans for VisualVM, JConsole, or JMX
*/
if (ninjaProps.getBooleanWithDefault("metrics.mbeans.enabled", true)) {
JmxReporter reporter = JmxReporter.forRegistry(metricRegistry)
.inDomain(applicationName).build();
reporter.start();
reporters.add(reporter);
log.debug("Started Ninja Metrics MBeans reporter");
}
log.info("Ninja Metrics is ready for collection.");
}
@Dispose(order = 10)
@Override
public void stop() {
for (Closeable reporter : reporters) {
log.debug("Stopping {}", reporter.getClass().getName());
try {
reporter.close();
} catch (IOException e) {
log.error("Failed to stop Metrics reporter", e);
}
}
log.info("Ninja Metrics stopped.");
}
@Override
public MetricRegistry getMetricRegistry() {
return metricRegistry;
}
private void registerAll(String prefix, MetricSet metrics) throws IllegalArgumentException {
for (Map.Entry<String, Metric> entry : metrics.getMetrics().entrySet()) {
if (entry.getValue() instanceof MetricSet) {
registerAll(MetricRegistry.name(prefix, entry.getKey()), (MetricSet) entry.getValue());
} else {
metricRegistry.register(MetricRegistry.name(prefix, entry.getKey()), entry.getValue());
}
}
}
@Override
public String getHostname() {
// try InetAddress.LocalHost first;
// NOTE -- InetAddress.getLocalHost().getHostName() will not work in
// certain environments.
try {
String result = InetAddress.getLocalHost().getHostName();
if (!Strings.isNullOrEmpty(result))
return result;
} catch (UnknownHostException e) {
// failed; try alternate means.
}
// try environment properties.
//
String host = System.getenv("COMPUTERNAME");
if (host != null)
return host;
host = System.getenv("HOSTNAME");
if (host != null)
return host;
// undetermined.
return "Ninja";
}
}