PHP實(shí)現(xiàn)基于狀態(tài)的責(zé)任鏈審批模式詳解

?php
  require('subject.php');
  if ($_GET){
    if (isset($_GET['createSubject'])){ //點(diǎn)擊創(chuàng)建文案后執(zhí)行
      $subject = new subject();
      $subject->content = '文案的內(nèi)容';
      $subject->save();
    }
  }
?>
html>
  head>
    title>責(zé)任鏈-審批/title>
    style>
      *{marign:0;padding:0}
      .container{width:100%;margin: 0 auto;text-align: center}
    /style>
  /head>
  body>
    div class="container">
      div>h2>流程演示界面/h2>/div>
      form method="get" action="show.php">
        div class="row">
          textarea name="" id="" cols="30" rows="10">/textarea>
          div>
            button name="createSubject">編輯創(chuàng)建文案/button>
          /div>
        /div>
        div class="row">
          hr>
          button name="step">領(lǐng)導(dǎo)審批/button>
        /div>
      /form>
    /div>
  /body>
/html>

?php
class subject
{
  public $content = ''; //文案內(nèi)容
  public $state = 0; //初試狀態(tài)
  /**
   * 保存內(nèi)容（編輯保存）
   */
  public function save(){
    //我們這里保存到本地文件
    file_put_contents(__DIR__.'/subject.json',json_encode($this));
    echo '文案已經(jīng)創(chuàng)建成功';
  }
}

?php
abstract class manager
{
  public $subject; //加載專題內(nèi)容
  public $mystate=0; //當(dāng)前狀態(tài)，這個(gè)很重要
  public $leader=false; //重要，設(shè)置自己的領(lǐng)導(dǎo)是誰
  public $myname = ''; //當(dāng)前審批者的名字
  /**
   * 設(shè)置領(lǐng)導(dǎo)是誰
   * @param $leader
   */
  public function setLeader($leader)
  {
    $this->leader = $leader; //形成責(zé)任鏈的關(guān)鍵
  }
  public function __construct()
  {
    $str = file_get_contents(__DIR__.'/subject.json');
    $this->subject = json_decode($str);
  }
  public function step($msg)
  {
    //很重要，代表審批
    //只有當(dāng)subject的state和自己的mystate相等是才會(huì)處理
    if ($this->subject->state == $this->mystate){ //代表當(dāng)前是自己要處理的
      //在這執(zhí)行審批通過的 具體
      echo $msg . '審批制是：'.$this->myname;
      //判斷自己的是否有領(lǐng)導(dǎo)，如果有把控制權(quán)交給領(lǐng)導(dǎo)
      if ($this->leader){
        $this->subject->state = $this->leader->mystate; //交控制權(quán)
        file_put_contents(__DIR__.'/subject.json',json_encode($this->subject)); //保存狀態(tài)
      }else{
        echo '審批已經(jīng)結(jié)束';
      }
    }else{
      if ($this->leader){ //leader就是維護(hù)整個(gè)類的 鏈
        //讓自己的領(lǐng)導(dǎo)去審批
        $this->leader->step($msg);
      }
    }
  }
}

?php
class BusinessLeader extends manager
{
  public $myname = '商務(wù)部領(lǐng)導(dǎo)';
  public $mystate = 0;
}

?php
class ProductLeader extends manager
{
  public $myname = '商品部領(lǐng)導(dǎo)';
  public $mystate = 1;
}

?php
class LastLeader extends manager
{
  public $myname = '終極領(lǐng)導(dǎo)';
  public $mystate = 2;
}

if (isset($_GET['step'])){ //進(jìn)入領(lǐng)導(dǎo)審批階段了
  //這里面最關(guān)鍵是
   //1.確定第一個(gè)領(lǐng)導(dǎo)是誰
   //2. 要維護(hù)各個(gè)領(lǐng)導(dǎo)直接的關(guān)系，
   require ('manager.php');
   require ('BusinessLeader.php');
   require ('ProductLeader.php');
   require ('LastLeader.php');
   $businessLeader = new BusinessLeader();
   $productLeader = new ProductLeader();
   $lastLeader = new LastLeader();
   //下面還是維護(hù)關(guān)系
   $businessLeader->setLeader($productLeader);
   $productLeader->setLeader($lastLeader);
   $businessLeader->step('審批通過');
}