Notifier makes it possible to uncouple senders and receivers (subscribers) of messages.
Notifier makes it possible to uncouple senders and receivers (subscribers) of messages.
事件通知类对于每一种消息能够区分谁是发送者，谁是接收者。
Notifier makes it possible to uncouple senders and receivers (subscribers) of messages.
事件通知类对于每一种消息能够区分谁是发送者，谁是接收者。