From d6a03000f3341ad3c31d0ea07e0c774ec1c6a998 Mon Sep 17 00:00:00 2001
From: Yang Bo <atryyang@thoughtworks.com>
Date: Fri, 25 May 2018 11:55:01 +0800
Subject: [PATCH] Remove MultipleException defined in DeepLearning.scala, use
 MultipleException in future.scala instead

---
 .../deeplearning/DeepLearning.scala           | 60 -------------------
 .../deeplearning/plugins/HLists.scala         |  6 +-
 2 files changed, 3 insertions(+), 63 deletions(-)

diff --git a/DeepLearning/src/main/scala/com/thoughtworks/deeplearning/DeepLearning.scala b/DeepLearning/src/main/scala/com/thoughtworks/deeplearning/DeepLearning.scala
index a5b56847..67bc765a 100644
--- a/DeepLearning/src/main/scala/com/thoughtworks/deeplearning/DeepLearning.scala
+++ b/DeepLearning/src/main/scala/com/thoughtworks/deeplearning/DeepLearning.scala
@@ -14,66 +14,6 @@ import scalaz.Semigroup
 
 object DeepLearning {
 
-  implicit object multipleExceptionThrowableSemigroup extends Semigroup[Throwable] {
-    override def append(f1: Throwable, f2: => Throwable): Throwable =
-      f1 match {
-        case me1: AbstractMultipleException =>
-          f2 match {
-            case me2: AbstractMultipleException => MultipleException(me1.throwableSet ++ me2.throwableSet)
-            case e: Throwable                   => MultipleException(me1.throwableSet + e)
-          }
-        case _: Throwable =>
-          f2 match {
-            case me2: AbstractMultipleException => MultipleException(me2.throwableSet + f1)
-            case `f1`                           => f1
-            case e: Throwable                   => MultipleException(Set(f1, e))
-          }
-      }
-  }
-
-  private final case class MultipleException(throwableSet: Set[Throwable])
-      extends DeepLearning.AbstractMultipleException
-
-  abstract class AbstractMultipleException extends RuntimeException("Multiple exceptions found") {
-
-    def throwableSet: Set[Throwable]
-
-    override def toString: String = throwableSet.mkString("\n")
-
-    override def printStackTrace(): Unit = {
-      for (throwable <- throwableSet) {
-        throwable.printStackTrace()
-      }
-    }
-
-    override def printStackTrace(s: PrintStream): Unit = {
-      for (throwable <- throwableSet) {
-        throwable.printStackTrace(s)
-      }
-    }
-
-    override def printStackTrace(s: PrintWriter): Unit = {
-      for (throwable <- throwableSet) {
-        throwable.printStackTrace(s)
-      }
-    }
-
-    override def getStackTrace: Array[StackTraceElement] = synchronized {
-      super.getStackTrace match {
-        case null =>
-          setStackTrace(throwableSet.flatMap(_.getStackTrace)(collection.breakOut))
-          super.getStackTrace
-        case stackTrace =>
-          stackTrace
-      }
-    }
-
-    override def fillInStackTrace(): this.type = {
-      this
-    }
-
-  }
-
   /** The node of wengert list created during [[DeepLearning.forward forward]] pass */
   final case class Tape[+Data, -Delta](data: Data, backward: Do[Delta] => UnitContinuation[Unit])
 
diff --git a/plugins-HLists/src/main/scala/com/thoughtworks/deeplearning/plugins/HLists.scala b/plugins-HLists/src/main/scala/com/thoughtworks/deeplearning/plugins/HLists.scala
index 67949daa..35c6fdb5 100644
--- a/plugins-HLists/src/main/scala/com/thoughtworks/deeplearning/plugins/HLists.scala
+++ b/plugins-HLists/src/main/scala/com/thoughtworks/deeplearning/plugins/HLists.scala
@@ -1,6 +1,7 @@
 package com.thoughtworks.deeplearning.plugins
 
 import com.thoughtworks.continuation._
+import com.thoughtworks.future._
 import com.thoughtworks.deeplearning.DeepLearning
 import com.thoughtworks.deeplearning.DeepLearning.Tape
 import com.thoughtworks.raii.asynchronous._
@@ -15,8 +16,7 @@ import scalaz.Semigroup
 
 private object HLists {
 
-  implicit val doParallelApplicative =
-    asynchronousDoParallelApplicative(DeepLearning.multipleExceptionThrowableSemigroup)
+  implicit val doParallelApplicative = asynchronousDoParallelApplicative
 
   private val noop: Do[HNil] => UnitContinuation[Unit] = {
     Function.const(UnitContinuation.now(()))
@@ -53,7 +53,7 @@ trait HLists {
 
         val doTail: ParallelDo[Tape[TailData, TailDelta]] = Parallel(tailDeepLearning.forward(tail))
 
-        Parallel.unwrap(Applicative[ParallelDo].tuple2(doHead, doTail)).map {
+        Parallel.unwrap(doParallelApplicative.tuple2(doHead, doTail)).map {
           case (Tape(headData, headBackward), Tape(tailData, tailBackward)) =>
             def backward(doDelta: Do[HeadDelta :: TailDelta]) = {
               val continuationHead: ParallelContinuation[Unit] = Parallel(headBackward(doDelta.map(_.head)))