markusthoemmes commented on a change in pull request #2282: Distributed tracing support #2192 URL: https://github.com/apache/incubator-openwhisk/pull/2282#discussion_r126936930
########## File path: common/scala/src/main/scala/whisk/common/tracing/TraceUtil.scala ########## @@ -0,0 +1,141 @@ +/* + * Copyright 2015-2016 IBM Corporation + * + * 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 whisk.common.tracing + +import java.util.concurrent.atomic.AtomicInteger +import scala.collection.mutable.Map +import akka.actor.ActorSystem +import com.github.levkhomich.akka.tracing._ +import whisk.common.{LoggingMarkers, TransactionId} + +/** + * Trace Utility Class which provides all methods to trace a given service. + */ +object TraceUtil{ + + private lazy val trace: TracingExtensionImpl = traceVar; + + private var traceVar: TracingExtensionImpl = null; Review comment: Why use two members here? just `var trace: TracingExtensionImpl = null` should work. Note that you would usually use `Option[TracingExtensionImpl]` to have NullPointer safe access later on. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
