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Example code of jasny/event-dispatcher

Informations about the package event-dispatcher

Jasny Event Dispatcher

Build Status Scrutinizer Code Quality Code Coverage Packagist Stable Version Packagist License

A PSR-14 compatible event dispatcher that's easy to use.

Event dispatching is a common and well-tested mechanism to allow developers to inject logic into an application easily and consistently.

The PSR only requires determining events based on their class name, any other method is optional. Libraries should only depend on the specification and not on the implementation, therefore each event type must have it's own class.

Installation

composer require jasny/event-dispatcher

Usage

1. Define your own event classes

2. Create listeners

The provider will use the type hint of the first argument of the lister to determine if the listener applies to the given event.

Listeners are executed in the order they're registered to the provider. It's not possible to prepend existing listeners.

3. Create the dispatcher

4. Dispatch an event

Typically a subject will hold its own dispatcher and trigger events.

Add listener

ListenerProvider and EventDispatcher are immutable services. Methods withListener and withListenerProvider resp will create a modified copy of each service.

Stoppable events

The event must implement the StoppableEventInterface of PSR-14.

Listener namespace

Listeners may be registered to the provider under a namespace.

This can be used to remove all listeners within the namespace and all subnamespaces.

This example removes both the listener in the censor and censor.json namespace.

Namespace wildcard

You may use a wildcard to specify all subnamespaces regardless of the parent

This example removes the listener in the censor.json namespace.

All versions of event-dispatcher with dependencies

PHP Build Version
Package Version
Requires php Version >=7.2.0
improved/function Version ~0.1.0
improved/iterable Version ~0.1.0
jasny/reflection-factory Version ^1.1
psr/event-dispatcher Version ^1.0
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