From 318939af8d86af56878c4cab60eb46c21c2dc66c Mon Sep 17 00:00:00 2001
From: Michael Donaghy <michael.donaghy@visualdna.com>
Date: Wed, 20 Aug 2014 12:36:44 +0100
Subject: + core: add support for trace context propagation on Scalaz futures

---
 .../scalaz/FutureInstrumentation.scala             | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 kamon-core/src/main/scala/kamon/instrumentation/scalaz/FutureInstrumentation.scala

(limited to 'kamon-core/src/main/scala')

diff --git a/kamon-core/src/main/scala/kamon/instrumentation/scalaz/FutureInstrumentation.scala b/kamon-core/src/main/scala/kamon/instrumentation/scalaz/FutureInstrumentation.scala
new file mode 100644
index 00000000..65caaa8f
--- /dev/null
+++ b/kamon-core/src/main/scala/kamon/instrumentation/scalaz/FutureInstrumentation.scala
@@ -0,0 +1,47 @@
+/*
+ * =========================================================================================
+ * Copyright © 2013-2014 the kamon project <http://kamon.io/>
+ *
+ * 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 kamon.instrumentation.scalaz
+
+import kamon.trace.{ TraceContextAware, TraceRecorder }
+import org.aspectj.lang.ProceedingJoinPoint
+import org.aspectj.lang.annotation._
+
+@Aspect
+class FutureInstrumentation {
+
+  @DeclareMixin("scalaz.concurrent..* && java.util.concurrent.Callable+")
+  def mixinTraceContextAwareToFutureRelatedCallable: TraceContextAware =
+    TraceContextAware.default
+
+  @Pointcut("execution((scalaz.concurrent..* && java.util.concurrent.Callable+).new(..)) && this(callable)")
+  def futureRelatedCallableCreation(callable: TraceContextAware): Unit = {}
+
+  @After("futureRelatedCallableCreation(callable)")
+  def afterCreation(callable: TraceContextAware): Unit =
+    // Force traceContext initialization.
+    callable.traceContext
+
+  @Pointcut("execution(* (scalaz.concurrent..* && java.util.concurrent.Callable+).call()) && this(callable)")
+  def futureRelatedCallableExecution(callable: TraceContextAware): Unit = {}
+
+  @Around("futureRelatedCallableExecution(callable)")
+  def aroundExecution(pjp: ProceedingJoinPoint, callable: TraceContextAware): Any =
+    TraceRecorder.withInlineTraceContextReplacement(callable.traceContext) {
+      pjp.proceed()
+    }
+
+}
-- 
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