add metrics to gc

pkg/util/workqueue/timed_queue.go

@@ -0,0 +1,62 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package workqueue
+
+import (
+	"time"
+
+	"k8s.io/kubernetes/pkg/util/clock"
+)
+
+type TimedWorkQueue struct {
+	*Type
+	clock clock.Clock
+}
+
+type timedWorkQueueItem struct {
+	time time.Time
+	obj  interface{}
+}
+
+func NewTimedWorkQueue(clock clock.Clock) *TimedWorkQueue {
+	return &TimedWorkQueue{New(), clock}
+}
+
+// Add adds the obj along with the current timestamp to the queue.
+func (q TimedWorkQueue) Add(obj interface{}) {
+	start := q.clock.Now()
+	item := timedWorkQueueItem{start, obj}
+	q.Type.Add(item)
+}
+
+// AddWithTimestamp is useful if the caller does not want to refresh the start
+// time when requeuing an item.
+func (q TimedWorkQueue) AddWithTimestamp(obj interface{}, timestamp time.Time) {
+	item := timedWorkQueueItem{timestamp, obj}
+	q.Type.Add(item)
+}
+
+// Get gets the obj along with its timestamp from the queue.
+func (q TimedWorkQueue) Get() (item interface{}, start time.Time, shutdown bool) {
+	item, shutdown = q.Type.Get()
+	if item != nil {
+		timed, _ := item.(timedWorkQueueItem)
+		item = timed.obj
+		start = timed.time
+	}
+	return item, start, shutdown
+}