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<?php
namespace GuzzleHttp\Event;
/**
* Guzzle event emitter.
*/
interface EmitterInterface
{
/**
* Binds a listener to a specific event.
*
* @param string $eventName Name of the event to bind to.
* @param callable $listener Listener to invoke when triggered.
* @param int|string $priority The higher this value, the earlier an event
* listener will be triggered in the chain (defaults to 0). You can
* pass "first" or "last" to dynamically specify the event priority
* based on the current event priorities associated with the given
* event name in the emitter. Use "first" to set the priority to the
* current highest priority plus one. Use "last" to set the priority to
* the current lowest event priority minus one.
*/
public function on($eventName, callable $listener, $priority = 0);
/**
* Binds a listener to a specific event. After the listener is triggered
* once, it is removed as a listener.
*
* @param string $eventName Name of the event to bind to.
* @param callable $listener Listener to invoke when triggered.
* @param int $priority The higher this value, the earlier an event
* listener will be triggered in the chain (defaults to 0)
*/
public function once($eventName, callable $listener, $priority = 0);
/**
* Removes an event listener from the specified event.
*
* @param string $eventName The event to remove a listener from
* @param callable $listener The listener to remove
*/
public function removeListener($eventName, callable $listener);
/**
* Gets the listeners of a specific event or all listeners if no event is
* specified.
*
* @param string $eventName The name of the event. Pass null (the default)
* to retrieve all listeners.
*
* @return array The event listeners for the specified event, or all event
* listeners by event name. The format of the array when retrieving a
* specific event list is an array of callables. The format of the array
* when retrieving all listeners is an associative array of arrays of
* callables.
*/
public function listeners($eventName = null);
/**
* Checks if the emitter has listeners by the given name.
*
* @param string $eventName The name of the event to check.
*
* @return bool
*/
public function hasListeners($eventName);
/**
* Emits an event to all registered listeners.
*
* Each event that is bound to the emitted eventName receives a
* EventInterface, the name of the event, and the event emitter.
*
* @param string $eventName The name of the event to dispatch.
* @param EventInterface $event The event to pass to the event handlers/listeners.
*
* @return EventInterface Returns the provided event object
*/
public function emit($eventName, EventInterface $event);
/**
* Attaches an event subscriber.
*
* The subscriber is asked for all the events it is interested in and added
* as an event listener for each event.
*
* @param SubscriberInterface $subscriber Subscriber to attach.
*/
public function attach(SubscriberInterface $subscriber);
/**
* Detaches an event subscriber.
*
* @param SubscriberInterface $subscriber Subscriber to detach.
*/
public function detach(SubscriberInterface $subscriber);
}
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