# Functions
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Pub bus为全局对象.
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SetPublisher 设置pub.
SetSubscriber 设置sub.
Sub bus为全局对象.
# Interfaces
Manager 管理端.
Publisher 发送事件.
PubManager 带管理.
SubManager 带管理.
Subscriber 订阅事件.
# Type aliases
EventHandler is used to process messages via a subscription of a topic.