Improve counts and columns

pkg/clustercache/cancel_collection.go

@@ -0,0 +1,29 @@
+package clustercache
+
+import (
+	"context"
+	"sync"
+	"sync/atomic"
+)
+
+type cancelCollection struct {
+	id    int64
+	items sync.Map
+}
+
+func (c *cancelCollection) Add(ctx context.Context, obj interface{}) {
+	key := atomic.AddInt64(&c.id, 1)
+	c.items.Store(key, obj)
+	go func() {
+		<-ctx.Done()
+		c.items.Delete(key)
+	}()
+}
+
+func (c *cancelCollection) List() (result []interface{}) {
+	c.items.Range(func(key, value interface{}) bool {
+		result = append(result, value)
+		return true
+	})
+	return
+}