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TracedExecutionContext.scala
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TracedExecutionContext.scala
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/*
* Copyright 2018-2019 The OpenTracing 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.opentracing.contrib.concurrent
import io.opentracing.{Span, Tracer}
import io.opentracing.util.GlobalTracer
import scala.concurrent.{ExecutionContext, ExecutionContextExecutor}
class TracedExecutionContext(ec: ExecutionContext, tracer: Tracer, createSpans: Boolean) extends ExecutionContextExecutor {
def this(ec: ExecutionContext) = this(ec, GlobalTracer.get(), false)
def this(ec: ExecutionContext, tracer: Tracer) = this(ec, tracer, false)
if (ec == null) throw new IllegalArgumentException("ec")
if (tracer == null) throw new IllegalArgumentException("tracer")
override def prepare(): ExecutionContext = {
if (!createSpans && tracer.scopeManager.active == null) return ec // Nothing to propagate/do.
new TracedExecutionContextImpl
}
override def reportFailure(cause: Throwable): Unit = ec.reportFailure(cause)
override def execute(command: Runnable): Unit = ec.execute(command)
class TracedExecutionContextImpl extends ExecutionContextExecutor {
val activeSpan: Span = if (createSpans) tracer.buildSpan(Constants.EXECUTE_OPERATION_NAME).start()
else tracer.scopeManager.active.span
override def reportFailure(cause: Throwable): Unit = ec.reportFailure(cause)
override def execute(command: Runnable): Unit = {
ec.execute(new Runnable {
override def run(): Unit = {
// Only deactivate the active Span if we created/own it.
val scope = tracer.scopeManager.activate(activeSpan, createSpans)
try {
command.run()
} finally {
scope.close()
}
}
})
}
}
}