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package com.yammer.metrics.core;
import com.yammer.metrics.core.Histogram.SampleType;
import java.util.*;
import java.util.concurrent.*;
/**
* A registry of metric instances.
*/
public class MetricsRegistry {
private static final int EXPECTED_METRIC_COUNT = 1024;
private final Clock clock;
private final ConcurrentMap metrics;
private final ThreadPools threadPools;
private final List listeners;
/**
* Creates a new {@link MetricsRegistry}.
*/
public MetricsRegistry() {
this(Clock.defaultClock());
}
/**
* Creates a new {@link MetricsRegistry} with the given {@link Clock} instance.
*
* @param clock a {@link Clock} instance
*/
public MetricsRegistry(Clock clock) {
this.clock = clock;
this.metrics = newMetricsMap();
this.threadPools = new ThreadPools();
this.listeners = new CopyOnWriteArrayList();
}
/**
* Given a new {@link Gauge}, registers it under the given class and name.
*
* @param klass the class which owns the metric
* @param name the name of the metric
* @param metric the metric
* @param the type of the value returned by the metric
* @return {@code metric}
*/
public Gauge newGauge(Class klass,
String name,
Gauge metric) {
return newGauge(klass, name, null, metric);
}
/**
* Given a new {@link Gauge}, registers it under the given class and name.
*
* @param klass the class which owns the metric
* @param name the name of the metric
* @param scope the scope of the metric
* @param metric the metric
* @param the type of the value returned by the metric
* @return {@code metric}
*/
public Gauge newGauge(Class klass,
String name,
String scope,
Gauge metric) {
return newGauge(createName(klass, name, scope), metric);
}
/**
* Given a new {@link Gauge}, registers it under the given metric name.
*
* @param metricName the name of the metric
* @param metric the metric
* @param the type of the value returned by the metric
* @return {@code metric}
*/
public Gauge newGauge(MetricName metricName,
Gauge metric) {
return getOrAdd(metricName, metric);
}
/**
* Creates a new {@link Counter} and registers it under the given class and name.
*
* @param klass the class which owns the metric
* @param name the name of the metric
* @return a new {@link Counter}
*/
public Counter newCounter(Class klass,
String name) {
return newCounter(klass, name, null);
}
/**
* Creates a new {@link Counter} and registers it under the given class and name.
*
* @param klass the class which owns the metric
* @param name the name of the metric
* @param scope the scope of the metric
* @return a new {@link Counter}
*/
public Counter newCounter(Class klass,
String name,
String scope) {
return newCounter(createName(klass, name, scope));
}
/**
* Creates a new {@link Counter} and registers it under the given metric name.
*
* @param metricName the name of the metric
* @return a new {@link Counter}
*/
public Counter newCounter(MetricName metricName) {
return getOrAdd(metricName, new Counter());
}
/**
* Creates a new {@link Histogram} and registers it under the given class and name.
*
* @param klass the class which owns the metric
* @param name the name of the metric
* @param biased whether or not the histogram should be biased
* @return a new {@link Histogram}
*/
public Histogram newHistogram(Class klass,
String name,
boolean biased) {
return newHistogram(klass, name, null, biased);
}
/**
* Creates a new {@link Histogram} and registers it under the given class, name, and scope.
*
* @param klass the class which owns the metric
* @param name the name of the metric
* @param scope the scope of the metric
* @param biased whether or not the histogram should be biased
* @return a new {@link Histogram}
*/
public Histogram newHistogram(Class klass,
String name,
String scope,
boolean biased) {
return newHistogram(createName(klass, name, scope), biased);
}
/**
* Creates a new non-biased {@link Histogram} and registers it under the given class and name.
*
* @param klass the class which owns the metric
* @param name the name of the metric
* @return a new {@link Histogram}
*/
public Histogram newHistogram(Class klass,
String name) {
return newHistogram(klass, name, false);
}
/**
* Creates a new non-biased {@link Histogram} and registers it under the given class, name, and
* scope.
*
* @param klass the class which owns the metric
* @param name the name of the metric
* @param scope the scope of the metric
* @return a new {@link Histogram}
*/
public Histogram newHistogram(Class klass,
String name,
String scope) {
return newHistogram(klass, name, scope, false);
}
/**
* Creates a new {@link Histogram} and registers it under the given metric name.
*
* @param metricName the name of the metric
* @param biased whether or not the histogram should be biased
* @return a new {@link Histogram}
*/
public Histogram newHistogram(MetricName metricName,
boolean biased) {
return getOrAdd(metricName,
new Histogram(biased ? SampleType.BIASED : SampleType.UNIFORM));
}
/**
* Creates a new {@link Meter} and registers it under the given class and name.
*
* @param klass the class which owns the metric
* @param name the name of the metric
* @param eventType the plural name of the type of events the meter is measuring (e.g., {@code
* "requests"})
* @param unit the rate unit of the new meter
* @return a new {@link Meter}
*/
public Meter newMeter(Class klass,
String name,
String eventType,
TimeUnit unit) {
return newMeter(klass, name, null, eventType, unit);
}
/**
* Creates a new {@link Meter} and registers it under the given class, name, and scope.
*
* @param klass the class which owns the metric
* @param name the name of the metric
* @param scope the scope of the metric
* @param eventType the plural name of the type of events the meter is measuring (e.g., {@code
* "requests"})
* @param unit the rate unit of the new meter
* @return a new {@link Meter}
*/
public Meter newMeter(Class klass,
String name,
String scope,
String eventType,
TimeUnit unit) {
return newMeter(createName(klass, name, scope), eventType, unit);
}
/**
* Creates a new {@link Meter} and registers it under the given metric name.
*
* @param metricName the name of the metric
* @param eventType the plural name of the type of events the meter is measuring (e.g., {@code
* "requests"})
* @param unit the rate unit of the new meter
* @return a new {@link Meter}
*/
public Meter newMeter(MetricName metricName,
String eventType,
TimeUnit unit) {
final Metric existingMetric = metrics.get(metricName);
if (existingMetric != null) {
return (Meter) existingMetric;
}
return getOrAdd(metricName, new Meter(newMeterTickThreadPool(), eventType, unit, clock));
}
/**
* Creates a new {@link Timer} and registers it under the given class and name, measuring
* elapsed time in milliseconds and invocations per second.
*
* @param klass the class which owns the metric
* @param name the name of the metric
* @return a new {@link Timer}
*/
public Timer newTimer(Class klass,
String name) {
return newTimer(klass, name, null, TimeUnit.MILLISECONDS, TimeUnit.SECONDS);
}
/**
* Creates a new {@link Timer} and registers it under the given class and name.
*
* @param klass the class which owns the metric
* @param name the name of the metric
* @param durationUnit the duration scale unit of the new timer
* @param rateUnit the rate scale unit of the new timer
* @return a new {@link Timer}
*/
public Timer newTimer(Class klass,
String name,
TimeUnit durationUnit,
TimeUnit rateUnit) {
return newTimer(klass, name, null, durationUnit, rateUnit);
}
/**
* Creates a new {@link Timer} and registers it under the given class, name, and scope,
* measuring elapsed time in milliseconds and invocations per second.
*
* @param klass the class which owns the metric
* @param name the name of the metric
* @param scope the scope of the metric
* @return a new {@link Timer}
*/
public Timer newTimer(Class klass,
String name,
String scope) {
return newTimer(klass, name, scope, TimeUnit.MILLISECONDS, TimeUnit.SECONDS);
}
/**
* Creates a new {@link Timer} and registers it under the given class, name, and scope.
*
* @param klass the class which owns the metric
* @param name the name of the metric
* @param scope the scope of the metric
* @param durationUnit the duration scale unit of the new timer
* @param rateUnit the rate scale unit of the new timer
* @return a new {@link Timer}
*/
public Timer newTimer(Class klass,
String name,
String scope,
TimeUnit durationUnit,
TimeUnit rateUnit) {
return newTimer(createName(klass, name, scope), durationUnit, rateUnit);
}
/**
* Creates a new {@link Timer} and registers it under the given metric name.
*
* @param metricName the name of the metric
* @param durationUnit the duration scale unit of the new timer
* @param rateUnit the rate scale unit of the new timer
* @return a new {@link Timer}
*/
public Timer newTimer(MetricName metricName,
TimeUnit durationUnit,
TimeUnit rateUnit) {
final Metric existingMetric = metrics.get(metricName);
if (existingMetric != null) {
return (Timer) existingMetric;
}
return getOrAdd(metricName,
new Timer(newMeterTickThreadPool(), durationUnit, rateUnit, clock));
}
/**
* Returns an unmodifiable map of all metrics and their names.
*
* @return an unmodifiable map of all metrics and their names
*/
public Map allMetrics() {
return Collections.unmodifiableMap(metrics);
}
/**
* Returns a grouped and sorted map of all registered metrics.
*
* @return all registered metrics, grouped by name and sorted
*/
public SortedMap> groupedMetrics() {
return groupedMetrics(MetricPredicate.ALL);
}
/**
* Returns a grouped and sorted map of all registered metrics which match then given {@link
* MetricPredicate}.
*
* @param predicate a predicate which metrics have to match to be in the results
* @return all registered metrics which match {@code predicate}, sorted by name
*/
public SortedMap> groupedMetrics(MetricPredicate predicate) {
final SortedMap> groups =
new TreeMap>();
for (Map.Entry entry : metrics.entrySet()) {
final String qualifiedTypeName = entry.getKey().getGroup() + "." + entry.getKey()
.getType();
if (predicate.matches(entry.getKey(), entry.getValue())) {
final String scopedName;
if (entry.getKey().hasScope()) {
scopedName = qualifiedTypeName + "." + entry.getKey().getScope();
} else {
scopedName = qualifiedTypeName;
}
SortedMap group = groups.get(scopedName);
if (group == null) {
group = new TreeMap();
groups.put(scopedName, group);
}
group.put(entry.getKey(), entry.getValue());
}
}
return Collections.unmodifiableSortedMap(groups);
}
/**
* Shut down this registry's thread pools.
*/
public void shutdown() {
threadPools.shutdown();
}
/**
* Creates a new scheduled thread pool of a given size with the given name, or returns an
* existing thread pool if one was already created with the same name.
*
* @param poolSize the number of threads to create
* @param name the name of the pool
* @return a new {@link ScheduledExecutorService}
*/
public ScheduledExecutorService newScheduledThreadPool(int poolSize, String name) {
return threadPools.newScheduledThreadPool(poolSize, name);
}
/**
* Removes the metric for the given class with the given name.
*
* @param klass the klass the metric is associated with
* @param name the name of the metric
*/
public void removeMetric(Class klass,
String name) {
removeMetric(klass, name, null);
}
/**
* Removes the metric for the given class with the given name and scope.
*
* @param klass the klass the metric is associated with
* @param name the name of the metric
* @param scope the scope of the metric
*/
public void removeMetric(Class klass,
String name,
String scope) {
removeMetric(createName(klass, name, scope));
}
/**
* Removes the metric with the given name.
*
* @param name the name of the metric
*/
public void removeMetric(MetricName name) {
final Metric metric = metrics.remove(name);
if (metric != null) {
if (metric instanceof Stoppable) {
((Stoppable) metric).stop();
}
notifyMetricRemoved(name);
}
}
/**
* Adds a {@link MetricsRegistryListener} to a collection of listeners that will be notified on
* metric creation. Listeners will be notified in the order in which they are added.
*
* N.B.: The listener will be notified of all existing metrics when it first registers.
*
* @param listener the listener that will be notified
*/
public void addListener(MetricsRegistryListener listener) {
listeners.add(listener);
for (Map.Entry entry : metrics.entrySet()) {
listener.onMetricAdded(entry.getKey(), entry.getValue());
}
}
/**
* Removes a {@link MetricsRegistryListener} from this registry's collection of listeners.
*
* @param listener the listener that will be removed
*/
public void removeListener(MetricsRegistryListener listener) {
listeners.remove(listener);
}
/**
* Override to customize how {@link MetricName}s are created.
*
* @param klass the class which owns the metric
* @param name the name of the metric
* @param scope the metric's scope
* @return the metric's full name
*/
protected MetricName createName(Class klass, String name, String scope) {
return new MetricName(klass, name, scope);
}
/**
* Returns a new {@link ConcurrentMap} implementation. Subclass this to do weird things with
* your own {@link MetricsRegistry} implementation.
*
* @return a new {@link ConcurrentMap}
*/
protected ConcurrentMap newMetricsMap() {
return new ConcurrentHashMap(EXPECTED_METRIC_COUNT);
}
/**
* Gets any existing metric with the given name or, if none exists, adds the given metric.
*
* @param name the metric's name
* @param metric the new metric
* @param the type of the metric
* @return either the existing metric or {@code metric}
*/
@SuppressWarnings("unchecked")
protected final T getOrAdd(MetricName name, T metric) {
final Metric existingMetric = metrics.get(name);
if (existingMetric == null) {
final Metric justAddedMetric = metrics.putIfAbsent(name, metric);
if (justAddedMetric == null) {
notifyMetricAdded(name, metric);
return metric;
}
if (metric instanceof Stoppable) {
((Stoppable) metric).stop();
}
return (T) justAddedMetric;
}
return (T) existingMetric;
}
private ScheduledExecutorService newMeterTickThreadPool() {
return threadPools.newScheduledThreadPool(2, "meter-tick");
}
private void notifyMetricRemoved(MetricName name) {
for (MetricsRegistryListener listener : listeners) {
listener.onMetricRemoved(name);
}
}
private void notifyMetricAdded(MetricName name, Metric metric) {
for (MetricsRegistryListener listener : listeners) {
listener.onMetricAdded(name, metric);
}
}
}
