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/*
* Copyright 2018, OpenCensus 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 io.opencensus.metrics;
import io.opencensus.common.ExperimentalApi;
import io.opencensus.internal.DefaultVisibilityForTesting;
import io.opencensus.internal.Provider;
import io.opencensus.metrics.export.ExportComponent;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Nullable;
/**
* Class for accessing the default {@link MetricsComponent}.
*
* @since 0.16
*/
@ExperimentalApi
public final class Metrics {
private static final Logger logger = Logger.getLogger(Metrics.class.getName());
private static final MetricsComponent metricsComponent =
loadMetricsComponent(MetricsComponent.class.getClassLoader());
/**
* Returns the global {@link ExportComponent}.
*
* @return the global {@code ExportComponent}.
* @since 0.16
*/
public static ExportComponent getExportComponent() {
return metricsComponent.getExportComponent();
}
/**
* Returns the global {@link MetricRegistry}.
*
* <p>This {@code MetricRegistry} is already added to the global {@link
* io.opencensus.metrics.export.MetricProducerManager}.
*
* @return the global {@code MetricRegistry}.
* @since 0.16
*/
public static MetricRegistry getMetricRegistry() {
return metricsComponent.getMetricRegistry();
}
// Any provider that may be used for MetricsComponent can be added here.
@DefaultVisibilityForTesting
static MetricsComponent loadMetricsComponent(@Nullable ClassLoader classLoader) {
try {
// Call Class.forName with literal string name of the class to help shading tools.
return Provider.createInstance(
Class.forName(
"io.opencensus.impl.metrics.MetricsComponentImpl", /*initialize=*/ true, classLoader),
MetricsComponent.class);
} catch (ClassNotFoundException e) {
logger.log(
Level.FINE,
"Couldn't load full implementation for MetricsComponent, now trying to load lite "
+ "implementation.",
e);
}
try {
// Call Class.forName with literal string name of the class to help shading tools.
return Provider.createInstance(
Class.forName(
"io.opencensus.impllite.metrics.MetricsComponentImplLite",
/*initialize=*/ true,
classLoader),
MetricsComponent.class);
} catch (ClassNotFoundException e) {
logger.log(
Level.FINE,
"Couldn't load lite implementation for MetricsComponent, now using default "
+ "implementation for MetricsComponent.",
e);
}
return MetricsComponent.newNoopMetricsComponent();
}
private Metrics() {}
}
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