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package com.tinkerpop.gremlin.server.util;
import com.codahale.metrics.ConsoleReporter;
import com.codahale.metrics.Counter;
import com.codahale.metrics.CsvReporter;
import com.codahale.metrics.Gauge;
import com.codahale.metrics.Histogram;
import com.codahale.metrics.JmxReporter;
import com.codahale.metrics.Meter;
import com.codahale.metrics.MetricFilter;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.Slf4jReporter;
import com.codahale.metrics.Timer;
import com.codahale.metrics.ganglia.GangliaReporter;
import com.codahale.metrics.graphite.Graphite;
import com.codahale.metrics.graphite.GraphiteReporter;
import info.ganglia.gmetric4j.gmetric.GMetric;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.management.MBeanServer;
import javax.management.MBeanServerFactory;
import java.io.File;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.List;
import java.util.Optional;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
/**
* Singleton that contains and configures Gremlin Server's {@code MetricRegistry}. Borrowed from Titan's approach to
* managing Metrics.
*
* @author Stephen Mallette (http://stephen.genoprime.com)
*/
public enum MetricManager {
INSTANCE;
private static final Logger log = LoggerFactory.getLogger(MetricManager.class);
private final MetricRegistry registry = new MetricRegistry();
private ConsoleReporter consoleReporter = null;
private CsvReporter csvReporter = null;
private JmxReporter jmxReporter = null;
private Slf4jReporter slf4jReporter = null;
private GangliaReporter gangliaReporter = null;
private GraphiteReporter graphiteReporter = null;
/**
* Return the Titan Metrics registry.
*
* @return the single {@code MetricRegistry} used for all of Titan's Metrics
* monitoring
*/
public MetricRegistry getRegistry() {
return registry;
}
/**
* Create a {@link ConsoleReporter} attached to the Titan Metrics registry.
*
* @param reportIntervalInMS milliseconds to wait between dumping metrics to the console
*/
public synchronized void addConsoleReporter(final long reportIntervalInMS) {
if (null != consoleReporter) {
log.debug("Metrics ConsoleReporter already active; not creating another");
return;
}
consoleReporter = ConsoleReporter.forRegistry(getRegistry()).build();
consoleReporter.start(reportIntervalInMS, TimeUnit.MILLISECONDS);
log.info("Configured Metrics ConsoleReporter configured with report interval={}ms", reportIntervalInMS);
}
/**
* Stop a {@link ConsoleReporter} previously created by a call to
* {@link #addConsoleReporter(long)} and release it for GC. Idempotent
* between calls to the associated add method. Does nothing before the first
* call to the associated add method.
*/
public synchronized void removeConsoleReporter() {
if (null != consoleReporter)
consoleReporter.stop();
consoleReporter = null;
}
/**
* Create a {@link CsvReporter} attached to the Titan Metrics registry.
*
* The {@code output} argument must be non-null but need not exist. If it
* doesn't already exist, this method attempts to create it by calling
* {@link File#mkdirs()}.
*
* @param reportIntervalInMS milliseconds to wait between dumping metrics to CSV files in
* the configured directory
* @param output the path to a directory into which Metrics will periodically
* write CSV data
*/
public synchronized void addCsvReporter(final long reportIntervalInMS,
final String output) {
File outputDir = new File(output);
if (null != csvReporter) {
log.debug("Metrics CsvReporter already active; not creating another");
return;
}
if (!outputDir.exists()) {
if (!outputDir.mkdirs()) {
log.warn("Failed to create CSV metrics dir {}", outputDir);
}
}
csvReporter = CsvReporter.forRegistry(getRegistry()).build(outputDir);
csvReporter.start(reportIntervalInMS, TimeUnit.MILLISECONDS);
log.info("Configured Metrics CsvReporter configured with report interval={}ms to fileName={}", reportIntervalInMS, output);
}
/**
* Stop a {@link CsvReporter} previously created by a call to
* {@link #addCsvReporter(long, String)} and release it for GC. Idempotent
* between calls to the associated add method. Does nothing before the first
* call to the associated add method.
*/
public synchronized void removeCsvReporter() {
if (null != csvReporter)
csvReporter.stop();
csvReporter = null;
}
/**
* Create a {@link JmxReporter} attached to the Titan Metrics registry.
*
* If {@code domain} or {@code agentId} is null, then Metrics's uses its own
* internal default value(s).
*
* If {@code agentId} is non-null, then
* MBeanServerFactory#findMBeanServer(agentId) must return exactly
* one {@code MBeanServer}. The reporter will register with that server. If
* the {@code findMBeanServer(agentId)} call returns no or multiple servers,
* then this method logs an error and falls back on the Metrics default for
* {@code agentId}.
*
* @param domain the JMX domain in which to continuously expose metrics
* @param agentId the JMX agent ID
*/
public synchronized void addJmxReporter(final String domain, final String agentId) {
if (null != jmxReporter) {
log.debug("Metrics JmxReporter already active; not creating another");
return;
}
JmxReporter.Builder b = JmxReporter.forRegistry(getRegistry());
if (null != domain) {
b.inDomain(domain);
}
if (null != agentId) {
List servs = MBeanServerFactory.findMBeanServer(agentId);
if (null != servs && 1 == servs.size()) {
b.registerWith(servs.get(0));
} else {
log.error("Metrics Slf4jReporter agentId {} does not resolve to a single MBeanServer", agentId);
}
}
jmxReporter = b.build();
jmxReporter.start();
log.info("Configured Metrics JmxReporter configured with domain={} and agentId={}",
Optional.ofNullable(domain).orElse(""), Optional.ofNullable(agentId).orElse(""));
}
/**
* Stop a {@link JmxReporter} previously created by a call to
* {@link #addJmxReporter(String, String)} and release it for GC. Idempotent
* between calls to the associated add method. Does nothing before the first
* call to the associated add method.
*/
public synchronized void removeJmxReporter() {
if (null != jmxReporter)
jmxReporter.stop();
jmxReporter = null;
}
/**
* Create a {@link Slf4jReporter} attached to the Titan Metrics registry.
*
* If {@code loggerName} is null, or if it is non-null but
* LoggerFactory.getLogger(loggerName) returns null, then Metrics's
* default Slf4j logger name is used instead.
*
* @param reportIntervalInMS milliseconds to wait between writing metrics to the Slf4j
* logger
* @param loggerName the name of the Slf4j logger that receives metrics
*/
public synchronized void addSlf4jReporter(final long reportIntervalInMS, final String loggerName) {
if (null != slf4jReporter) {
log.debug("Metrics Slf4jReporter already active; not creating another");
return;
}
Slf4jReporter.Builder b = Slf4jReporter.forRegistry(getRegistry());
if (null != loggerName) {
Logger l = LoggerFactory.getLogger(loggerName);
if (null != l) {
b.outputTo(l);
} else {
log.error("Logger with name {} could not be obtained", loggerName);
}
}
slf4jReporter = b.build();
slf4jReporter.start(reportIntervalInMS, TimeUnit.MILLISECONDS);
log.info("Configured Metrics Slf4jReporter configured with interval={}ms and loggerName={}", reportIntervalInMS, loggerName);
}
/**
* Stop a {@link Slf4jReporter} previously created by a call to
* {@link #addSlf4jReporter(long, String)} and release it for GC. Idempotent
* between calls to the associated add method. Does nothing before the first
* call to the associated add method.
*/
public synchronized void removeSlf4jReporter() {
if (null != slf4jReporter)
slf4jReporter.stop();
slf4jReporter = null;
}
/**
* Create a {@link GangliaReporter} attached to the Titan Metrics registry.
*
* {@code groupOrHost} and {@code addressingMode} must be non-null. The
* remaining non-primitive arguments may be null. If {@code protocol31} is
* null, then true is assumed. Null values of {@code hostUUID} or
* {@code spoof} are passed into the {@link GMetric} constructor, which
* causes Ganglia to use its internal logic for generating a default UUID
* and default reporting hostname (respectively).
*
* @param groupOrHost the multicast group or unicast hostname to which Ganglia
* events are sent
* @param port the port to which events are sent
* @param addressingMode whether to send events with multicast or unicast
* @param ttl multicast ttl (ignored for unicast)
* @param protocol31 true to use Ganglia protocol version 3.1, false to use 3.0
* @param hostUUID uuid for the host
* @param spoof override this machine's IP/hostname as it appears on the
* Ganglia server
* @param reportIntervalInMS milliseconds to wait before sending data to the ganglia
* unicast host or multicast group
* @throws IOException when a {@link GMetric} can't be instantiated using the
* provided arguments
*/
public synchronized void addGangliaReporter(final String groupOrHost, final int port,
final GMetric.UDPAddressingMode addressingMode, final int ttl, final Boolean protocol31,
final UUID hostUUID, final String spoof, final long reportIntervalInMS) throws IOException {
if (null == groupOrHost || groupOrHost.isEmpty())
throw new IllegalArgumentException("groupOrHost cannot be null or empty");
if (null == addressingMode)
throw new IllegalArgumentException("addressing mode cannot be null");
if (null != gangliaReporter) {
log.debug("Metrics GangliaReporter already active; not creating another");
return;
}
final boolean protocol = null == protocol31 ? true : protocol31;
GMetric ganglia = new GMetric(groupOrHost, port, addressingMode, ttl,
protocol, hostUUID, spoof);
GangliaReporter.Builder b = GangliaReporter.forRegistry(getRegistry());
gangliaReporter = b.build(ganglia);
gangliaReporter.start(reportIntervalInMS, TimeUnit.MILLISECONDS);
log.info("Configured Ganglia Metrics reporter host={} interval={}ms port={} addrmode={} ttl={} proto31={} uuid={} spoof={}",
new Object[]{groupOrHost, reportIntervalInMS, port, addressingMode, ttl, protocol31, hostUUID, spoof});
}
/**
* Stop a {@link GangliaReporter} previously created by a call to
* addGangliaReporter(String, int, GMetric.UDPAddressingMode, int, Boolean, UUID, long)
* and release it for GC. Idempotent between calls to the associated add
* method. Does nothing before the first call to the associated add method.
*/
public synchronized void removeGangliaReporter() {
if (null != gangliaReporter)
gangliaReporter.stop();
gangliaReporter = null;
}
/**
* Create a {@link GraphiteReporter} attached to the Titan Metrics registry.
*
* If {@code prefix} is null, then Metrics's internal default prefix is used
* (empty string at the time this comment was written).
*
* @param host the host to which Graphite reports are sent
* @param port the port to which Graphite reports are sent
* @param prefix the optional metrics prefix
* @param reportIntervalInMS milliseconds to wait between sending metrics to the configured
* Graphite host and port
*/
public synchronized void addGraphiteReporter(final String host, final int port,
final String prefix, final long reportIntervalInMS) {
if (host == null || host.isEmpty())
throw new IllegalArgumentException("Host cannot be null or empty");
Graphite graphite = new Graphite(new InetSocketAddress(host, port));
GraphiteReporter.Builder b = GraphiteReporter
.forRegistry(getRegistry());
if (null != prefix)
b.prefixedWith(prefix);
b.filter(MetricFilter.ALL);
graphiteReporter = b.build(graphite);
graphiteReporter.start(reportIntervalInMS, TimeUnit.MILLISECONDS);
log.info("Configured Graphite reporter host={} interval={}ms port={} prefix={}",
new Object[]{host, reportIntervalInMS, port, prefix});
}
/**
* Stop a {@link GraphiteReporter} previously created by a call to
* {@link #addGraphiteReporter(String, int, String, long)} and release it
* for GC. Idempotent between calls to the associated add method. Does
* nothing before the first call to the associated add method.
*/
public synchronized void removeGraphiteReporter() {
if (null != graphiteReporter)
graphiteReporter.stop();
graphiteReporter = null;
}
/**
* Remove all Titan Metrics reporters previously configured through the
* {@code add*} methods on this class.
*/
public synchronized void removeAllReporters() {
removeConsoleReporter();
removeCsvReporter();
removeJmxReporter();
removeSlf4jReporter();
removeGangliaReporter();
removeGraphiteReporter();
}
public Counter getCounter(final String name) {
return getRegistry().counter(name);
}
public Counter getCounter(final String prefix, final String... names) {
return getRegistry().counter(MetricRegistry.name(prefix, names));
}
public Gauge getGuage(final Gauge gauge, final String name) {
return getRegistry().register(name, gauge);
}
public Gauge getGuage(final Gauge gauge, final String prefix, final String... names) {
return getRegistry().register(MetricRegistry.name(prefix, names), gauge);
}
public Meter getMeter(final String name) {
return getRegistry().meter(name);
}
public Meter getMeter(final String prefix, final String... names) {
return getRegistry().meter(MetricRegistry.name(prefix, names));
}
public Timer getTimer(final String name) {
return getRegistry().timer(name);
}
public Timer getTimer(final String prefix, final String... names) {
return getRegistry().timer(MetricRegistry.name(prefix, names));
}
public Histogram getHistogram(final String name) {
return getRegistry().histogram(name);
}
public Histogram getHistogram(final String prefix, final String... names) {
return getRegistry().histogram(MetricRegistry.name(prefix, names));
}
}
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