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/*
* Copyright 2016, Google Inc.
* 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.stats;
import com.google.common.annotations.VisibleForTesting;
import io.opencensus.internal.Provider;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Nullable;
/** Class for accessing the default {@link StatsComponent}. */
public final class Stats {
private static final Logger logger = Logger.getLogger(Stats.class.getName());
private static final StatsComponent statsComponent =
loadStatsComponent(StatsComponent.class.getClassLoader());
/** Returns the default {@link StatsRecorder}. */
@Nullable
public static StatsRecorder getStatsRecorder() {
return statsComponent == null ? null : statsComponent.getStatsRecorder();
}
/** Returns the default {@link ViewManager}. */
@Nullable
public static ViewManager getViewManager() {
return statsComponent == null ? null : statsComponent.getViewManager();
}
// Any provider that may be used for StatsComponent can be added here.
@VisibleForTesting
static StatsComponent loadStatsComponent(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.stats.StatsComponentImpl", true, classLoader),
StatsComponent.class);
} catch (ClassNotFoundException e) {
logger.log(
Level.FINE,
"Couldn't load full implementation for StatsComponent, 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.stats.StatsComponentImplLite", true, classLoader),
StatsComponent.class);
} catch (ClassNotFoundException e) {
logger.log(
Level.FINE,
"Couldn't load lite implementation for StatsComponent, now using "
+ "default implementation for StatsComponent.",
e);
}
return StatsComponent.getNoopStatsComponent();
}
private Stats() {}
}
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