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ContextPropagationSupport.java
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ContextPropagationSupport.java
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/*
* Copyright (c) 2023 VMware Inc. or its affiliates, All Rights Reserved.
*
* 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
*
* https://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 reactor.core.publisher;
import reactor.util.Logger;
import reactor.util.Loggers;
final class ContextPropagationSupport {
static final Logger LOGGER = Loggers.getLogger(ContextPropagationSupport.class);
// Note: If reflection is used for this field, then the name of the field should end with 'Available'.
// The preprocessing for native-image support is in Spring Framework, and is a short term solution.
// The field should end with 'Available'. See org.springframework.aot.nativex.feature.PreComputeFieldFeature.
// Ultimately the long term solution should be provided by Reactor Core.
static final boolean isContextPropagationOnClasspath;
static boolean propagateContextToThreadLocals = false;
static boolean captureInBlockOperator = false;
static {
boolean contextPropagation = false;
try {
Class.forName("io.micrometer.context.ContextRegistry");
contextPropagation = true;
} catch (ClassNotFoundException notFound) {
} catch (LinkageError linkageErr) {
} catch (Throwable err) {
LOGGER.error("Unexpected exception while detecting ContextPropagation feature." +
" The feature is considered disabled due to this:", err);
}
isContextPropagationOnClasspath = contextPropagation;
}
/**
* Is Micrometer {@code context-propagation} API on the classpath?
*
* @return true if context-propagation is available at runtime, false otherwise
*/
static boolean isContextPropagationAvailable() {
return isContextPropagationOnClasspath;
}
static boolean shouldPropagateContextToThreadLocals() {
return isContextPropagationOnClasspath && propagateContextToThreadLocals;
}
static boolean shouldRestoreThreadLocalsInSomeOperators() {
return isContextPropagationOnClasspath && !propagateContextToThreadLocals;
}
static boolean shouldCaptureInBlockingOperators() {
return isContextPropagationOnClasspath && propagateContextToThreadLocals
&& captureInBlockOperator;
}
}