From 76e5c9cfc1d663724ec1003b110f08836ebd505a Mon Sep 17 00:00:00 2001
From: dongming <dongming@dongming-pc>
Date: Tue, 13 Dec 2022 22:14:31 +0800
Subject: [PATCH] l-23

---
 vendor/k8s.io/client-go/tools/cache/delta_fifo.go | 9 +++++++++
 vendor/k8s.io/client-go/tools/cache/reflector.go  | 7 +++++++
 2 files changed, 16 insertions(+)

diff --git a/vendor/k8s.io/client-go/tools/cache/delta_fifo.go b/vendor/k8s.io/client-go/tools/cache/delta_fifo.go
index 0c13a41..78b28ad 100644
--- a/vendor/k8s.io/client-go/tools/cache/delta_fifo.go
+++ b/vendor/k8s.io/client-go/tools/cache/delta_fifo.go
@@ -404,6 +404,7 @@ func isDeletionDup(a, b *Delta) *Delta {
 	return b
 }
 
+// 将新元素加入队列的方法，并且调用前要加锁。附带作用，填充了items
 // queueActionLocked appends to the delta list for the object.
 // Caller must lock first.
 func (f *DeltaFIFO) queueActionLocked(actionType DeltaType, obj interface{}) error {
@@ -573,10 +574,14 @@ func (f *DeltaFIFO) Pop(process PopProcessFunc) (interface{}, error) {
 // are those listed by `f.knownObjects` and the current object of K is
 // what `f.knownObjects.GetByKey(K)` returns.
 func (f *DeltaFIFO) Replace(list []interface{}, _ string) error {
+	// 调用这个函数的时候时线程安全的
 	f.lock.Lock()
 	defer f.lock.Unlock()
+
+	// 注意keys的类型是一个集合
 	keys := make(sets.String, len(list))
 
+	// 是为了兼容考虑，并没有更多的意义
 	// keep backwards compat for old clients
 	action := Sync
 	if f.emitDeltaTypeReplaced {
@@ -589,12 +594,16 @@ func (f *DeltaFIFO) Replace(list []interface{}, _ string) error {
 		if err != nil {
 			return KeyError{item, err}
 		}
+
 		keys.Insert(key)
+
 		if err := f.queueActionLocked(action, item); err != nil {
 			return fmt.Errorf("couldn't enqueue object: %v", err)
 		}
 	}
 
+
+	// 处理没有提供已知对象的方法集的情况
 	if f.knownObjects == nil {
 		// Do deletion detection against our own list.
 		queuedDeletions := 0
diff --git a/vendor/k8s.io/client-go/tools/cache/reflector.go b/vendor/k8s.io/client-go/tools/cache/reflector.go
index 4e4be02..8ecc1c3 100644
--- a/vendor/k8s.io/client-go/tools/cache/reflector.go
+++ b/vendor/k8s.io/client-go/tools/cache/reflector.go
@@ -244,6 +244,13 @@ var internalPackages = []string{"client-go/tools/cache/"}
 func (r *Reflector) Run(stopCh <-chan struct{}) {
 	klog.V(3).Infof("Starting reflector %s (%s) from %s", r.expectedTypeName, r.resyncPeriod, r.name)
 	wait.BackoffUntil(func() {
+		// 在运行 List & Watch 工程中要提供下游处理的方法。提供这些方法的对象，就是delta pipo queue
+		// 他需要提供
+		// Replace（）
+		// Resync
+		// Add（）
+		// Update()
+		// Delete()
 		if err := r.ListAndWatch(stopCh); err != nil {// 调用了 list & watch，
 			r.watchErrorHandler(r, err)
 		}