Java MetricRegistryListener类代码示例

import com.codahale.metrics.MetricRegistryListener; //导入依赖的package包/类
private void notifyListenerOfAddedMetric(
	final MetricRegistryListener listener, final Metric metric, final String name
) {
	if(metric instanceof Gauge) {
		listener.onGaugeAdded(name, (Gauge<?>) metric);
	} else if(metric instanceof Counter) {
		listener.onCounterAdded(name, (Counter) metric);
	} else if(metric instanceof Histogram) {
		listener.onHistogramAdded(name, (Histogram) metric);
	} else if(metric instanceof Meter) {
		listener.onMeterAdded(name, (Meter) metric);
	} else if(metric instanceof Timer) {
		listener.onTimerAdded(name, (Timer) metric);
	} else {
		throw new IllegalArgumentException("Unsupported metric type: " + metric.getClass());
	}
}
 

import com.codahale.metrics.MetricRegistryListener; //导入依赖的package包/类
private void notifyListenerOfRemovedMetric(
	final String name, final Metric metric, final MetricRegistryListener listener
) {
	if(metric instanceof Gauge) {
		listener.onGaugeRemoved(name);
	} else if(metric instanceof Counter) {
		listener.onCounterRemoved(name);
	} else if(metric instanceof Histogram) {
		listener.onHistogramRemoved(name);
	} else if(metric instanceof Meter) {
		listener.onMeterRemoved(name);
	} else if(metric instanceof Timer) {
		listener.onTimerRemoved(name);
	} else {
		throw new IllegalArgumentException("Unsupported metric type: " + metric.getClass());
	}
}
 

import com.codahale.metrics.MetricRegistryListener; //导入依赖的package包/类
@Test
public void testWrappingDropwizardMetrics() {
	Metric2Registry registry = new Metric2Registry();
	MetricRegistryListener listener = Mockito.mock(MetricRegistryListener.class);
	registry.getMetricRegistry().addListener(listener);
	
	registry.register(MetricName.name("test").build(), new Gauge<Integer>() {
		@Override
		public Integer getValue() {
			return 1;
		}
	});
	
	// Verify the underlying Dropwizard listener was called
	Mockito.verify(listener).onGaugeAdded(Mockito.eq("test"), Mockito.<Gauge>any());

	// Should be able to read the gauge from either registry
	Map.Entry<MetricName, Gauge> stagemonitorEntry = registry.getGauges().entrySet().iterator().next();
	Map.Entry<String, Gauge> dropwizardEntry = registry.getMetricRegistry().getGauges().entrySet().iterator().next();
	assertEquals("test", stagemonitorEntry.getKey().getName());
	assertEquals(1,
			stagemonitorEntry.getValue().getValue());
	
	assertEquals("test", dropwizardEntry.getKey());
	assertEquals(1,
			dropwizardEntry.getValue().getValue());
	
	// Unregister should notify Dropwizard listeners
	registry.remove(MetricName.name("test").build());
	Mockito.verify(listener).onGaugeRemoved(Mockito.eq("test"));
	
	assertEquals(0, registry.getGauges().size());
	assertEquals(0, registry.getMetricRegistry().getGauges().size());
}
 

import com.codahale.metrics.MetricRegistryListener; //导入依赖的package包/类
/**
 * Creates a new {@link CustomMetricRegistry}.
 */
public CustomMetricRegistry() {
	this.metrics = buildMap();
	this.listeners = new CopyOnWriteArrayList<MetricRegistryListener>();
}
 

import com.codahale.metrics.MetricRegistryListener; //导入依赖的package包/类
private void onMetricAdded(final String name, final Metric metric) {
	for(final MetricRegistryListener listener : listeners) {
		notifyListenerOfAddedMetric(listener, metric, name);
	}
}
 

import com.codahale.metrics.MetricRegistryListener; //导入依赖的package包/类
private void onMetricRemoved(final String name, final Metric metric) {
	for(final MetricRegistryListener listener : listeners) {
		notifyListenerOfRemovedMetric(name, metric, listener);
	}
}
 

import com.codahale.metrics.MetricRegistryListener; //导入依赖的package包/类
@Override
public void removeListener(MetricRegistryListener listener) {
    throw new UnsupportedOperationException();
}
 

import com.codahale.metrics.MetricRegistryListener; //导入依赖的package包/类
@Override
public void addListener(MetricRegistryListener listener) {
    throw new UnsupportedOperationException();
}
 

import com.codahale.metrics.MetricRegistryListener; //导入依赖的package包/类
/**
 * Adds a {@link MetricRegistryListener} to a collection of listeners that will be notified on
 * metric creation.  Listeners will be notified in the order in which they are added.
 * <p>
 * <b>N.B.:</b> The listener will be notified of all existing metrics when it first registers.
 *
 * @param listener the listener that will be notified
 */
public final void addListener(final MetricRegistryListener listener) {
	listeners.add(listener);

	for(Map.Entry<String, Metric> entry : metrics.entrySet()) {
		notifyListenerOfAddedMetric(listener, entry.getValue(), entry.getKey());
	}
}
 

import com.codahale.metrics.MetricRegistryListener; //导入依赖的package包/类
/**
 * Removes a {@link MetricRegistryListener} from this registry's collection of listeners.
 *
 * @param listener the listener that will be removed
 */
public final void removeListener(final MetricRegistryListener listener) {
	listeners.remove(listener);
}