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Example code of ant-framework/middleware

Informations about the package middleware

Ant框架使用的中间件

中间件运行流程

简单的介绍

  1. 因为是基于PHP的协同进行的开发，并且运用了一些新特性，要求使用版本为>=5.6.0
  2. 每次yield后，会挂起当前中间件，执行下一个中间件
  3. yield不是必须的，如果没有yield，此中间件被执行完毕之后不会被再次回调
  4. 在执行完function之后会尝试恢复之前挂起的中间件，恢复的时候可以进行传值
  5. 如果出现了异常，中间件的调用链会停止，然后恢复之前挂起的中间件，尝试使用这些中间件处理异常
  6. 参考 : http://php.net/manual/zh/language.generators.syntax.php

使用

通过yield关键词获取重新入栈的信息

then中闭包函数返回的值，会在恢复中间件的时候传递给每个协同函数，协同函数可以通过$message = yield这样的语法来获取值(更详细的语法可以去参考PHP手册)，根据不同的版本有两种方式来改变重新入栈时传递的值，PHP7以上通过return就可以改变传递的值，5.6使用第二个yield返回，注意是第二个

打断中间件调用链

yield false 这种方式会打断中间件的后续所有调用

在中间件的运行过程中，如果出现异常，中间件的往下的调用链会被打断，然后开始回调中间件，回调的过程是以责任链的方式完成，如果内层中间件无法处理异常，那么外层中间件会尝试捕获这个异常，如果一直无法处理,异常将会抛到最顶层来处理，如果处理了这个异常，那么异常回调链将会被打断，程序会返回至中间件启动的位置（内层外层可以参考流程图）

All versions of middleware with dependencies

PHP Build Version
Package Version
Requires php Version >=5.6.0
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