Laravel 5 - 事件处理程序和侦听器之间的混乱 [英] Laravel 5 - Confusion between Event Handlers and Listeners

问题描述

我对事件和侦听器之间的不同有些困惑。

I'm a bit confused about the different between Events and Listeners.

我了解了可以在事件下创建事件，然后注册它们，并在 Handlers\Events 中实现处理程序。所以在这里我有事件和事件的处理。

I understood how you can create your events under Events then register them and implement the Handlers in Handlers\Events. So here I have events and the handling of events.

他们在 Providers\EventServiceProvider.php

protected $listen = [
    UserHasSignedUp::class => [
        SendWelcomeEmail::class,
        SendAdminEmail::class
    ]
];

那么什么是听众？

对我来说，他们似乎与事件处理程序完全相同？

To me they seem exactly the same thing as Event Handlers?

推荐答案

在你的例子中， UserHasSignedUp 是一个事件。 SendWelcomeEmail 和 SendAdminEmail 是两个侦听器等待事件UserHasSignedUp被触发，他们应该实现所需的业务逻辑在 handle 方法。

In your example UserHasSignedUp is an Event. SendWelcomeEmail and SendAdminEmail are two listeners "waiting" for the event UserHasSignedUp to be fired and they should implement the required business logic at handle method of each one.

超简单的例子：

UserController中的某个地方

Somewhere in UserController

Event::fire(new UserHasSignedUp($user)); //UserHasSignedUp is the event being fired

SendWelcomeEmail类

SendWelcomeEmail class

class SendWelcomeEmail //this is the listener class
{
    public function handle(UserHasSignedUp $event) //this is the "handler method"
    {
        //send an email
    }   
}

您可以看到，每个事件可以有多个侦听器，但是一个侦听器不能听多于一个事件。
如果您想要一个听许多事件的班级，您应该查看活动订阅者

As you can see, each event can have multiple listeners, but a listener cant listen to more than a single event. If you want a class listening to many events, you should take a look to Event Subscribers

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