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Example code of componenta/event

Informations about the package event

Componenta Event

PHP 8.4+ License MIT PSR-14 Tests

Minimal PSR-14 event dispatcher with prioritized and composite listener providers. Mutable providers with unsubscribe tokens, immutable dispatcher.

Русская документация

Installation

Requirements

Related Packages

Package Why it matters here
psr/event-dispatcher Defines the PSR-14 dispatcher and listener-provider interfaces.
componenta/auth Can publish authentication and session lifecycle events.
componenta/cqrs Can publish command lifecycle events through EventMiddleware.
componenta/error-handler Can report errors through listeners.
componenta/di Can create listeners from the application container.

Quick Start

Components

EventDispatcher

Final, readonly PSR-14 dispatcher. The provider reference is shared — listeners registered later are visible to all dispatches.

Events implementing Psr\EventDispatcher\StoppableEventInterface halt propagation when isPropagationStopped() becomes true. An already-stopped event skips all listeners.

ListenerProvider

Plain listener registry keyed by event class. addListener() returns an unsubscribe closure.

PrioritizedProvider

Listeners are dispatched in priority order. Sorting is lazy and cache-aware — adding a listener after a dispatch invalidates the cached order.

Priorities are resolved in this order: explicit $priority argument → PrioritizedListenerInterface::$priority → 0. Listeners with equal priority are dispatched in registration order (stable sort).

PrioritizedListenerInterface

Invokable listeners can expose their own priority:

CompositeProvider

Aggregates multiple providers into one. contains() is recursive; has() works across EventTypeAwareProviderInterface children.

Bulk Registration

Patterns

One-shot listener

Scoped subscription

Reference

Symbol Purpose
EventDispatcher PSR-14 dispatcher, final readonly
ListenerProvider Plain keyed-by-event-class registry
PrioritizedProvider Priority-ordered registry with lazy sort
CompositeProvider Aggregate of child providers, recursive contains
EventTypeAwareProviderInterface Contract for providers that expose has(eventType)
PrioritizedListenerInterface Listener-side priority declaration
SortMode ASC / DESC for PrioritizedProvider

All mutable providers expose: addListener, addListeners, removeListener, contains, has. addListener returns an unsubscribe Closure.

License

MIT

All versions of event with dependencies

PHP Build Version
Package Version
Requires php Version ^8.4
psr/event-dispatcher Version ^1.0
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