Laravel Pipeline解读

大家好，今天给大家介绍下Laravel框架的Pipeline。它是一个非常好用的组件，能够使代码的结构非常清晰。 Laravel的中间件机制便是基于它来实现的。通过Pipeline，可以轻松实现APO编程。官方GIT地址https://github.com/illuminate…下面的代码是我实现的一个简化版本：class Pipeline{ /** * The method to call on each pipe * @var string / protected $method = ‘handle’; /* * The object being passed throw the pipeline * @var mixed / protected $passable; /* * The array of class pipes * @var array / protected $pipes = []; /* * Set the object being sent through the pipeline * * @param $passable * @return $this / public function send($passable) { $this->passable = $passable; return $this; } /* * Set the method to call on the pipes * @param array $pipes * @return $this / public function through($pipes) { $this->pipes = $pipes; return $this; } /* * @param \Closure $destination * @return mixed / public function then(\Closure $destination) { $pipeline = array_reduce(array_reverse($this->pipes), $this->getSlice(), $destination); return $pipeline($this->passable); } /* * Get a Closure that represents a slice of the application onion * @return \Closure */ protected function getSlice() { return function($stack, $pipe){ return function ($request) use ($stack, $pipe) { return $pipe::{$this->method}($request, $stack); }; }; }}此类主要逻辑就在于then和getSlice方法。通过array_reduce，生成一个接受一个参数的匿名函数，然后执行调用。简单使用示例class ALogic{ public static function handle($data, \Clourse $next) { print “开始 A 逻辑”; $ret = $next($data); print “结束 A 逻辑”; return $ret; }}class BLogic{ public static function handle($data, \Clourse $next) { print “开始 B 逻辑”; $ret = $next($data); print “结束 B 逻辑”; return $ret; }}class CLogic{ public static function handle($data, \Clourse $next) { print “开始 C 逻辑”; $ret = $next($data); print “结束 C 逻辑”; return $ret; }}$pipes = [ ALogic::class, BLogic::class, CLogic::class];$data = “any things”;(new Pipeline())->send($data)->through($pipes)->then(function($data){ print $data;});运行结果：“开始 A 逻辑"“开始 B 逻辑"“开始 C 逻辑"“any things"“结束 C 逻辑"“结束 B 逻辑"“结束 A 逻辑"AOP示例AOP 的优点就在于动态的添加功能，而不对其它层次产生影响，可以非常方便的添加或者删除功能。class IpCheck{ public static function handle($data, \Clourse $next) { if (“IP invalid”) { // IP 不合法 throw Exception(“ip invalid”); } return $next($data); }}class StatusManage{ public static function handle($data, \Clourse $next) { // exec 可以执行初始化状态的操作 $ret = $next($data) // exec 可以执行保存状态信息的操作 return $ret; }}$pipes = [ IpCheck::class, StatusManage::class,];(new Pipeline())->send($data)->through($pipes)->then(function($data){ “执行其它逻辑”;});