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.
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Notifier makes it possible to uncouple senders and receivers of messages.
事件通知可以区分消息的发送者和接收者.
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The notifier is responsible for message routing; for each type of message, a different notifier exists.
事件通知类负责消息的路由, 对于每种不同类型的消息存在有一种不同的通知.
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