DefaultStoreIndexers todo.

DefaultStoreIndexFunc todo.

MetaNamespaceKeyFunc is a convenient default KeyFunc which knows how to make keys for API objects which implement meta.Interface.

StepEventHandlerFuncs is an adaptor to let you easily specify as many or as few of the notification functions as you want while still implementing ResourceEventHandler.

Informer 负责事件通知.

StepEventHandler can handle notifications for events that happen to a resource.

Watcher 负责事件通知.

ExplicitKey can be passed to MetaNamespaceKeyFunc if you have the key for the object but not the object itself.