skinny.engine.ServletConcurrencyException.scala Maven / Gradle / Ivy

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package skinny.engine

/**
 * Represents concurrency issue access multiple threads on the Servlet.
 */
class ServletConcurrencyException
    extends RuntimeException(ServletConcurrencyException.message) {

}

object ServletConcurrencyException {

  val message: String = {
    """
      |
      |------------------------------------------------------
      |
      |  !!! Concurrency Issue Detected !!!
      |
      |  Your code inside Future values or running on other thread is directly accessing Skinny Engine's APIs that depend on Servlet's main thread's state.
      |  To make this code safer, you need to explicitly pass SkinnyEngineContext to them like this:
      |
      |  get("/somewhere") {
      |    implicit val ctx = context // fix context outside of Future blocks
      |    Future {
      |      // Fix detected `ambiguous implicit values` errors here
      |      // (e.g.) params(ctx), ctx.request instead of request
      |    }
      |  }
      |
      |------------------------------------------------------
      |""".stripMargin
  }

}