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/*
* =========================================================================================
* Copyright © 2013 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.macros
import scala.language.experimental.macros
import scala.reflect.macros.Context
object InlineTraceContextMacro {
// Macro to generate an inline version of kamon.trace.TraceRecorder.withTraceContext
def withInlineTraceContextImpl[T: c.WeakTypeTag, TC: c.WeakTypeTag](c: Context)(traceCtx: c.Expr[TC])(thunk: c.Expr[T]) = {
import c.universe._
val inlineThunk =
Block(
List(
ValDef(
Modifiers(), newTermName("oldContext"), TypeTree(),
Select(Ident(newTermName("TraceRecorder")), newTermName("currentContext"))),
Apply(
Select(Ident(newTermName("TraceRecorder")), newTermName("setContext")),
List(traceCtx.tree))),
Try(
thunk.tree,
List(),
Apply(
Select(Ident(newTermName("TraceRecorder")), newTermName("setContext")),
List(Ident(newTermName("oldContext"))))))
c.Expr[T](inlineThunk)
}
}
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