Merge pull request #5 from koykov/leak-direction-1

Constants in leak metrics.

dummy.go

@@ -15,7 +15,7 @@ func (DummyMetrics) WorkerStop(_ uint32, _ bool, _ WorkerStatus) {}
 func (DummyMetrics) QueuePut()                                   {}
 func (DummyMetrics) QueuePull()                                  {}
 func (DummyMetrics) QueueRetry()                                 {}
-func (DummyMetrics) QueueLeak(_ string)                          {}
+func (DummyMetrics) QueueLeak(_ LeakDirection)                   {}
 func (DummyMetrics) QueueLost()                                  {}
 
 // DummyDLQ is a stub DLQ implementation. It does nothing and need for queues with leak tolerance.

leak.go

@@ -12,14 +12,3 @@ const (
 
 	defaultFrontLeakAttempts = 5
 )
-
-func (ld LeakDirection) String() string {
-	switch ld {
-	case LeakDirectionRear:
-		return "rear"
-	case LeakDirectionFront:
-		return "front"
-	default:
-		return "unknown"
-	}
-}

metrics.go

@@ -26,7 +26,7 @@ type MetricsWriter interface {
 	QueueRetry()
 	// QueueLeak registers item's leak from the full queue.
 	// Param dir indicates leak direction and may be "rear" or "front".
-	QueueLeak(dir string)
+	QueueLeak(dir LeakDirection)
 	// QueueLost registers lost items missed queue and DLQ.
 	QueueLost()
 }

queue.go

@@ -255,7 +255,7 @@ func (q *Queue) renqueue(itm *item) (err error) {
 					if err = q.c().DLQ.Enqueue(itmf.payload); err != nil {
 						return
 					}
-					q.mw().QueueLeak(LeakDirectionFront.String())
+					q.mw().QueueLeak(LeakDirectionFront)
 					select {
 					case q.stream <- *itm:
 						return
@@ -267,7 +267,7 @@ func (q *Queue) renqueue(itm *item) (err error) {
 			}
 			// Rear direction, just leak item.
 			err = q.c().DLQ.Enqueue(itm.payload)
-			q.mw().QueueLeak(LeakDirectionRear.String())
+			q.mw().QueueLeak(LeakDirectionRear)
 		}
 	} else {
 		// Regular put (blocking mode).
@@ -341,7 +341,7 @@ func (q *Queue) close(force bool) error {
 			itm := <-q.stream
 			if q.CheckBit(flagLeaky) {
 				_ = q.c().DLQ.Enqueue(itm.payload)
-				q.mw().QueueLeak(LeakDirectionFront.String())
+				q.mw().QueueLeak(LeakDirectionFront)
 			} else {
 				q.mw().QueueLost()
 			}

worker.go

@@ -120,7 +120,7 @@ func (w *worker) await(queue *Queue) {
 					_ = queue.renqueue(&itm)
 				} else if queue.CheckBit(flagLeaky) && w.c().FailToDLQ {
 					_ = w.c().DLQ.Enqueue(itm.payload)
-					w.mw().QueueLeak(w.c().LeakDirection.String())
+					w.mw().QueueLeak(w.c().LeakDirection)
 				}
 			}
 		case WorkerStatusIdle: