concurrency - how to make this play scala controller work? -

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i trying create controller extracts file on fly archive , then renders static asset default asset controller

    import play.api.play.current     // import controllers.assets     import play.api.logger     import myextract.extract          import scala.concurrent.{executioncontext, future}          import play.api.libs.concurrent.execution.implicits.defaultcontext          object myassets extends controller {            // drop version , serve asset           def at(path: string, file: string): action[anycontent] = action.async {               logger.info("looking file = %s" format file)             val ret = future {                  extract.getfile(path, file) // extracts file archive // throws exception if file cannot extracted              }             ret.map {                 v => assets.at(path, file)              }           }         }

i these errors @ compile

 ./activator compile  [info] loading project definition /home/sylvain/yo-scala/project  [info] set current project play-slick-advanced (in build file:/home /sylvain/yo-scala/)  [info] compiling 1 scala source , 1 java source /home/sylvain/yo-scala/target/scala-2.11/classes...  [error] /home/sylvain/yo-scala/app/controllers/myassets.scala:14: overloaded method value async alternatives: [error]   (block: play.api.mvc.request[play.api.mvc.anycontent] => scala.concurrent.future[play.api.mvc.result])play.api.mvc.action[play.api.mvc.anycontent] <and> [error]   (block: => scala.concurrent.future[play.api.mvc.result])play.api.mvc.action[play.api.mvc.anycontent] [error]  cannot applied (scala.concurrent.future[play.api.mvc.action[play.api.mvc.anycontent]]) [error]   def at(path: string, file: string): action[anycontent] = action.async {  [error]                                                                    [error] 1 error found [error] (compile:compile) compilation failed

you either have make sure action returns future:

    import play.api.play.current     // import controllers.assets     import play.api.logger     import myextract.extract          import scala.concurrent.{executioncontext, future}          import play.api.libs.concurrent.execution.implicits.defaultcontext          object myassets extends controller {            // drop version , serve asset           def at(path: string, file: string): action[anycontent] = action.async {               logger.info("looking file = %s" format file)             val ret = future {                  extract.getfile(path, file) // extracts file archive // throws exception if file cannot extracted              }             ret.map {                 v => scala.concurrent.future {assets.at(path, file)}             }           }         }

or change it's not async anymore:

    import play.api.play.current     // import controllers.assets     import play.api.logger     import myextract.extract          import scala.concurrent.{executioncontext, future}          import play.api.libs.concurrent.execution.implicits.defaultcontext          object myassets extends controller {            // drop version , serve asset           def at(path: string, file: string): action[anycontent] = action {               logger.info("looking file = %s" format file)             val ret = future {                  extract.getfile(path, file) // extracts file archive // throws exception if file cannot extracted              }             ret.map {                 v => assets.at(path, file)              }           }         }

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