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/*
* Copyright 2017, 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.tags;
import com.google.common.annotations.VisibleForTesting;
import io.opencensus.internal.Provider;
import java.util.logging.Level;
import java.util.logging.Logger;
/** Class for accessing the default {@link TagsComponent}. */
public final class Tags {
private static final Logger logger = Logger.getLogger(Tags.class.getName());
private static final TagsComponent tagsComponent =
loadTagsComponent(TagsComponent.class.getClassLoader());
private Tags() {}
/**
* Returns the default {@code TagContexts}.
*
* @return the default {@code TagContexts}.
*/
public static TagContexts getTagContexts() {
return tagsComponent.getTagContexts();
}
/**
* Returns the default {@code TagPropagationComponent}.
*
* @return the default {@code TagPropagationComponent}.
*/
public static TagPropagationComponent getTagPropagationComponent() {
return tagsComponent.getTagPropagationComponent();
}
// Any provider that may be used for TagsComponent can be added here.
@VisibleForTesting
static TagsComponent loadTagsComponent(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.tags.TagsComponentImpl", true, classLoader),
TagsComponent.class);
} catch (ClassNotFoundException e) {
logger.log(
Level.FINE,
"Couldn't load full implementation for TagsComponent, 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.tags.TagsComponentImplLite", true, classLoader),
TagsComponent.class);
} catch (ClassNotFoundException e) {
logger.log(
Level.FINE,
"Couldn't load lite implementation for TagsComponent, now using "
+ "default implementation for TagsComponent.",
e);
}
return TagsComponent.getNoopTagsComponent();
}
}
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