phalcon 自定义事件使用的多种方式

方法1：官方文档的方式。

这是控制器：
    public function indexAction()
    {
        $this->view->disable();
        $eventsManager = new EventsManager();
        $myComponent = new A1();
        $eventsManager->attach('my-component', new SomeListen());
        $myComponent->setEventsManager($eventsManager);
        $myComponent->someTask();
    }

这是组件，
<?php

namespace Learn_phalcon;
use Phalcon\Events\EventsAwareInterface;
use Phalcon\Events\ManagerInterface;


class A1 implements EventsAwareInterface
{
    protected $eventsManager;

    public function setEventsManager(ManagerInterface $eventsManager)
    {
        $this->eventsManager = $eventsManager;
    }

    public function getEventsManager()
    {
        return $this->eventsManager;
    }

    public function getinfo(){
        return "is A1";
    }

    public function someTask()
    {
        $this->eventsManager->fire('my-component:beforeSomeTask', $this);
        echo 'Here, someTask<br>' ;
        $this->eventsManager->fire('my-component:afterSomeTask', $this);
    }
}

下面是监听器
<?php

namespace Learn_phalcon;

use Phalcon\Events\Event;

class SomeListen
{
    public function beforeSomeTask(Event $event, $myComponent)
    {
        echo "Here, beforeSomeTask". $myComponent->getinfo() ."<br>\n";
    }

    public function afterSomeTask(Event $event, $myComponent)
    {
        echo "Here, afterSomeTask". $myComponent->getinfo()."<br>\n" ;
    }
}

最终输出：
Here, beforeSomeTaskis A1
Here, someTask
Here, afterSomeTaskis A1


第2种方式，构造方法自定义：

监听器不变，控制器如下
public function index2Action()
    {
        $this->view->disable();
        $myComponent = new A2();
        $myComponent->someTask();
    }
组件A2.php如下：

<?php

namespace Learn_phalcon;
use Phalcon\Events\EventsAwareInterface;
use Phalcon\Events\ManagerInterface;
use Phalcon\Events\Manager as EventsManager;


/*
* 此类本身包含
*
*/
class A2 implements EventsAwareInterface
{
    public function __construct()
    {
        $eventsManager = new EventsManager();
        $eventsManager->attach('my-component', new SomeListen());
        $this->setEventsManager($eventsManager);
    }

    protected $eventsManager;

    public function setEventsManager(ManagerInterface $eventsManager)
    {
        $this->eventsManager = $eventsManager;
    }

    public function getinfo(){
        return "is A2";
    }

    public function getEventsManager()
    {
        return $this->eventsManager;
    }

    public function someTask()
    {
        $this->eventsManager->fire('my-component:beforeSomeTask', $this);
        echo 'A2 is Here, someTask<br>\n';
        $this->eventsManager->fire('my-component:afterSomeTask', $this);
    }
}

效果如下：
Here, beforeSomeTaskis A2
A2 is Here, someTask
\nHere, afterSomeTaskis A2

第3种方式，自定义容器方式：

监听器不变，控制器如下：
public function index3Action()
    {
        $this->view->disable();
        $myComponent = $this->getDi()->get('my_a3');
        $myComponent->someTask();
    }

组件和A1一样，只是类名改成A3：
此外，添加容器。 在项目初始化时。

$di->setShared('my_a3', function()use($di) {
    $a3 = new \Learn_phalcon\A3();
    $eventManager = new EventsManager();
    $eventManager->attach('my-component:beforeSomeTask' , new \Learn_phalcon\SomeListen() );
    $eventManager->attach('my-component:afterSomeTask' , new \Learn_phalcon\SomeListen() );
    $a3->setEventsManager($eventManager);
    return $a3;
});

效果如下：
Here, beforeSomeTaskis A3
A3 is Here, someTask
\nHere, afterSomeTaskis A3

总结
使用事件花样繁多，总有一款适合你。

另外，方式1 虽然最啰嗦，但有一个大好处，就是监听器可以获取当前运行环境的变量，放自己构造方法里。

而方式2 ，方式3，是预先定义的，于是没法写参数了。于是监听器就不好处理了。
只能放到组件里，可是这样，就有点耦合了。