初始化代码

vendor/topthink/framework/src/think/Pipeline.php

@@ -0,0 +1,106 @@
+<?php
+// +----------------------------------------------------------------------
+// | ThinkPHP [ WE CAN DO IT JUST THINK ]
+// +----------------------------------------------------------------------
+// | Copyright (c) 2006~2019 http://thinkphp.cn All rights reserved.
+// +----------------------------------------------------------------------
+// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
+// +----------------------------------------------------------------------
+// | Author: yunwuxin <448901948@qq.com>
+// +----------------------------------------------------------------------
+namespace think;
+
+use Closure;
+use Exception;
+use Throwable;
+
+class Pipeline
+{
+    protected $passable;
+
+    protected $pipes = [];
+
+    protected $exceptionHandler;
+
+    /**
+     * 初始数据
+     * @param $passable
+     * @return $this
+     */
+    public function send($passable)
+    {
+        $this->passable = $passable;
+        return $this;
+    }
+
+    /**
+     * 调用栈
+     * @param $pipes
+     * @return $this
+     */
+    public function through($pipes)
+    {
+        $this->pipes = is_array($pipes) ? $pipes : func_get_args();
+        return $this;
+    }
+
+    /**
+     * 执行
+     * @param Closure $destination
+     * @return mixed
+     */
+    public function then(Closure $destination)
+    {
+        $pipeline = array_reduce(
+            array_reverse($this->pipes),
+            $this->carry(),
+            function ($passable) use ($destination) {
+                try {
+                    return $destination($passable);
+                } catch (Throwable | Exception $e) {
+                    return $this->handleException($passable, $e);
+                }
+            });
+
+        return $pipeline($this->passable);
+    }
+
+    /**
+     * 设置异常处理器
+     * @param callable $handler
+     * @return $this
+     */
+    public function whenException($handler)
+    {
+        $this->exceptionHandler = $handler;
+        return $this;
+    }
+
+    protected function carry()
+    {
+        return function ($stack, $pipe) {
+            return function ($passable) use ($stack, $pipe) {
+                try {
+                    return $pipe($passable, $stack);
+                } catch (Throwable | Exception $e) {
+                    return $this->handleException($passable, $e);
+                }
+            };
+        };
+    }
+
+    /**
+     * 异常处理
+     * @param $passable
+     * @param $e
+     * @return mixed
+     */
+    protected function handleException($passable, Throwable $e)
+    {
+        if ($this->exceptionHandler) {
+            return call_user_func($this->exceptionHandler, $passable, $e);
+        }
+        throw $e;
+    }
+
+}