Extend Job Hooks and add unit tests

Add job tagger control

internal/tagger/tagger.go

@@ -4,14 +4,48 @@
 // license that can be found in the LICENSE file.
 package tagger
 
-import "github.com/ClusterCockpit/cc-backend/pkg/schema"
+import (
+	"sync"
+
+	"github.com/ClusterCockpit/cc-backend/internal/repository"
+	"github.com/ClusterCockpit/cc-backend/pkg/schema"
+)
 
 type Tagger interface {
 	Register() error
 	Match(job *schema.Job)
 }
 
-func Init() error {
+var (
+	initOnce  sync.Once
+	jobTagger *JobTagger
+)
 
-	return nil
+type JobTagger struct {
+	startTaggers []Tagger
+	stopTaggers  []Tagger
+}
+
+func Init() {
+	initOnce.Do(func() {
+		jobTagger = &JobTagger{}
+		jobTagger.startTaggers = make([]Tagger, 0)
+		jobTagger.startTaggers = append(jobTagger.startTaggers, &AppTagger{})
+
+		for _, tagger := range jobTagger.startTaggers {
+			tagger.Register()
+		}
+
+		// jobTagger.stopTaggers = make([]Tagger, 0)
+		repository.RegisterJobJook(jobTagger)
+	})
+}
+
+func (jt *JobTagger) JobStartCallback(job *schema.Job) {
+	for _, tagger := range jobTagger.startTaggers {
+		tagger.Match(job)
+	}
+}
+
+func (jt *JobTagger) JobStopCallback(job *schema.Job) {
 }