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add images for pub/sub pattern & update readme
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发布-订阅是一种消息传递模式,基本设计原则是将消息发布者和提供者分开,常常用于在不同组件之间传递消息。
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它有点类似于观察者行为设计模式,但是发布订阅模式往往要依赖一个中介<通常是各类的消息中间件,消息队列>
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![图示关系](../../images/pub-sub-pattern-0.png)
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发布订阅模式往往实现为<消息代理,消息中间件,消息队列>等
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有三个关键组是:消息本身、消息主题、订阅用户。
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该模式中的三个关键类型:消息本身、消息主题、订阅用户。
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![图示关系](../../images/pub-sub-pattern-1.png)
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图片来源:[pubsub-pattern.md](https://github.com/imsardine/dev-notes/blob/source/docs/pubsub-pattern.md)
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