From 1398d993d512edebb662042d9540d40847500451 Mon Sep 17 00:00:00 2001
From: erwinvaneyk <erwinvaneyk@gmail.com>
Date: Fri, 13 Jul 2018 13:47:14 +0200
Subject: [PATCH] Parallize task executions

---
 pkg/controller/actions.go          | 27 +++++++++++++++++++++++++++
 pkg/controller/invocation/rules.go | 13 ++++---------
 2 files changed, 31 insertions(+), 9 deletions(-)

diff --git a/pkg/controller/actions.go b/pkg/controller/actions.go
index 9306cc0f..a9598e77 100644
--- a/pkg/controller/actions.go
+++ b/pkg/controller/actions.go
@@ -1,6 +1,8 @@
 package controller
 
 import (
+	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/fission/fission-workflows/pkg/fes"
@@ -71,3 +73,28 @@ func (a *ActionError) Apply() error {
 func (a *ActionError) Eval(rule EvalContext) Action {
 	return a
 }
+
+type MultiAction struct {
+	Actions []Action
+}
+
+func (a *MultiAction) Apply() error {
+	var wg sync.WaitGroup
+	var multiErr atomic.Value
+	wg.Add(len(a.Actions))
+	for _, action := range a.Actions {
+		go func(action Action) {
+			err := action.Apply()
+			if err != nil {
+				multiErr.Store(err)
+			}
+			wg.Done()
+		}(action)
+	}
+	wg.Wait()
+	err := multiErr.Load()
+	if err == nil {
+		return nil
+	}
+	return err.(error)
+}
diff --git a/pkg/controller/invocation/rules.go b/pkg/controller/invocation/rules.go
index 1c69c917..c5e8a994 100644
--- a/pkg/controller/invocation/rules.go
+++ b/pkg/controller/invocation/rules.go
@@ -91,6 +91,7 @@ func (sf *RuleSchedule) Eval(cec controller.EvalContext) controller.Action {
 	}
 
 	// Execute the actions as specified in the execution plan
+	var actions []controller.Action
 	for _, a := range schedule.Actions {
 		switch a.Type {
 		case scheduler.ActionType_ABORT:
@@ -110,18 +111,18 @@ func (sf *RuleSchedule) Eval(cec controller.EvalContext) controller.Action {
 			if err != nil {
 				log.Errorf("Failed to unpack Scheduler action: %v", err)
 			}
-			return &ActionInvokeTask{
+			actions = append(actions, &ActionInvokeTask{
 				Wf:         wf,
 				Wfi:        wfi,
 				API:        sf.FunctionAPI,
 				Task:       invokeAction,
 				StateStore: sf.StateStore,
-			}
+			})
 		default:
 			log.Warnf("Unknown Scheduler action: '%v'", a)
 		}
 	}
-	return nil
+	return &controller.MultiAction{Actions: actions}
 }
 
 type RuleCheckIfCompleted struct {
@@ -149,12 +150,6 @@ func (cc *RuleCheckIfCompleted) Eval(cec controller.EvalContext) controller.Acti
 	if finished {
 		var finalOutput *types.TypedValue
 		if len(wf.Spec.OutputTask) != 0 {
-			//t, ok := wfi.Status.Tasks[wf.Spec.OutputTask]
-			//if !ok {
-			//	return &controller.ActionError{
-			//		Err: errors.New("could not find output task status in completed invocation"),
-			//	}
-			//}
 			finalOutput = typedvalues.ResolveTaskOutput(wf.Spec.OutputTask, wfi)
 		}