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/
ContextHandleUtils.java
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/
ContextHandleUtils.java
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/*
* Copyright 2016-17, 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.trace.unsafe;
import io.opencensus.internal.Provider;
import io.opencensus.trace.ContextHandle;
import io.opencensus.trace.ContextManager;
import io.opencensus.trace.Span;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Nullable;
public class ContextHandleUtils {
// No instance of this class.
private ContextHandleUtils() {}
private static final Logger LOGGER = Logger.getLogger(ContextHandleUtils.class.getName());
private static final ContextManager CONTEXT_MANAGER =
loadContextManager(ContextManager.class.getClassLoader());
private static ContextManager loadContextManager(@Nullable ClassLoader classLoader) {
try {
return Provider.createInstance(
Class.forName(
"io.opentelemetry.opencensusshim.OpenTelemetryContextManager",
/*initialize=*/ true,
classLoader),
ContextManager.class);
} catch (ClassNotFoundException e) {
LOGGER.log(
Level.FINE,
"Couldn't load full implementation for OpenTelemetry context manager, now loading "
+ "original implementation.",
e);
}
return new ContextManagerImpl();
}
public static ContextHandle currentContext() {
return CONTEXT_MANAGER.currentContext();
}
/**
* Creates a new {@code ContextHandle} with the given value set.
*
* @param context the parent {@code ContextHandle}.
* @param span the value to be set.
* @return a new context with the given value set.
*/
public static ContextHandle withValue(
ContextHandle context, @javax.annotation.Nullable Span span) {
return CONTEXT_MANAGER.withValue(context, span);
}
/**
* Returns the value from the specified {@code ContextHandle}.
*
* @param context the specified {@code ContextHandle}.
* @return the value from the specified {@code ContextHandle}.
*/
public static Span getValue(ContextHandle context) {
return CONTEXT_MANAGER.getValue(context);
}
}