PSR-14 事件分发器
最后更新于：2022-04-02 02:19:46
[TOC]
## 安装
```
composer require psr/event-dispatcher
```
## 接口
Psr\event-dispatcher\EventDispatcherInterface
```
namespace Psr\EventDispatcher;
/**
* Defines a dispatcher for events.
*/
interface EventDispatcherInterface
{
/**
* Provide all relevant listeners with an event to process.
*
* @param object $event
* The object to process.
*
* @return object
* The Event that was passed, now modified by listeners.
*/
public function dispatch(object $event);
}
```
Psr\event-dispatcher\ListenerProviderInterface
```
namespace Psr\EventDispatcher;
/**
* Mapper from an event to the listeners that are applicable to that event.
*/
interface ListenerProviderInterface
{
/**
* @param object $event
* An event for which to return the relevant listeners.
* @return iterable[callable]
* An iterable (array, iterator, or generator) of callables. Each
* callable MUST be type-compatible with $event.
*/
public function getListenersForEvent(object $event) : iterable;
}
```
Psr\EventDispatcher\StoppableEventInterface.php
```
namespace Psr\EventDispatcher;
/**
* An Event whose processing may be interrupted when the event has been handled.
*
* A Dispatcher implementation MUST check to determine if an Event
* is marked as stopped after each listener is called. If it is then it should
* return immediately without calling any further Listeners.
*/
interface StoppableEventInterface
{
/**
* Is propagation stopped?
*
* This will typically only be used by the Dispatcher to determine if the
* previous listener halted propagation.
*
* @return bool
* True if the Event is complete and no further listeners should be called.
* False to continue calling listeners.
*/
public function isPropagationStopped() : bool;
}
```
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