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hydrakit/event
==============

PSR-14 event dispatcher for Hydra PHP framework

v0.2.0(yesterday)0162MITPHP >=8.2

Since Jul 2Compare

[ Source](https://github.com/hydra-foundation/event)[ Packagist](https://packagist.org/packages/hydrakit/event)[ RSS](/packages/hydrakit-event/feed)WikiDiscussions Synced today

READMEChangelogDependencies (3)Versions (4)Used By (2)

Hydra Event
===========

[](#hydra-event)

A minimal [PSR-14](https://www.php-fig.org/psr/psr-14/) event dispatcher for the Hydra framework. It lets one subsystem announce that something happened without knowing — or depending on — whoever cares.

Like the rest of Hydra it binds to the PSR interfaces rather than inventing its own: events are plain objects, listeners are callables, and the dispatcher is a `Psr\EventDispatcher\EventDispatcherInterface`. There is nothing to learn beyond the standard.

What it ships
-------------

[](#what-it-ships)

- **`Dispatcher`** — a PSR-14 `EventDispatcherInterface`. `dispatch($event)` calls every matched listener in order and returns the same event object (so a caller can read what listeners left on a mutable event). Honours `StoppableEventInterface`.
- **`ListenerProvider`** — a PSR-14 `ListenerProviderInterface` with one small, non-standard extension: `listen(string $eventType, callable $listener)`. PSR-14 is silent on registration; this is how listeners get in. Matching is by `instanceof`, so a listener on a base class or marker interface fires for every subtype.
- **`EventServiceProvider`** — binds a single shared `ListenerProvider` behind three keys (`ListenerProvider`, `ListenerProviderInterface`, `EventDispatcherInterface`) so the app registers into the same instance the dispatcher reads from.

It ships the mechanism only. Which events matter and who reacts to them is app policy — registered at the composition root, the same "ship the verb, the app supplies the noun" seam as auth's user provider.

Using it
--------

[](#using-it)

Register the provider (before any provider whose services dispatch events):

```
$app->register(new SessionServiceProvider)
    ->register(new EventServiceProvider)
    ->register(new AuthServiceProvider)   // auth picks up the dispatcher if bound
    ->register(new AppServiceProvider);
```

Define an event — a plain object, immutable when it is just a fact:

```
final class OrderPlaced
{
    public function __construct(public readonly int $orderId) {}
}
```

Register a listener where the app composes itself (typically a provider's `boot()`):

```
$container->get(ListenerProvider::class)
    ->listen(OrderPlaced::class, [$auditListener, 'onOrderPlaced']);
```

Dispatch it from wherever the thing happens:

```
$this->events->dispatch(new OrderPlaced($order->id));
```

A subsystem that wants to stay usable without the event package should depend on a nullable `?EventDispatcherInterface` and dispatch with `?->` — exactly what `hydrakit/auth` does.

###  Health Score

39

—

LowBetter than 84% of packages

Maintenance100

Actively maintained with recent releases

Popularity7

Limited adoption so far

Community5

Small or concentrated contributor base

Maturity38

Early-stage or recently created project

How is this calculated?**Maintenance (25%)** — Last commit recency, latest release date, and issue-to-star ratio. Uses a 2-year decay window.

**Popularity (30%)** — Total and monthly downloads, GitHub stars, and forks. Logarithmic scaling prevents top-heavy scores.

**Community (15%)** — Contributors, dependents, forks, watchers, and maintainers. Measures real ecosystem engagement.

**Maturity (30%)** — Project age, version count, PHP version support, and release stability.

###  Release Activity

Cadence

Every ~4 days

Total

3

Last Release

1d ago

### Community

Maintainers

![](https://www.gravatar.com/avatar/a947272da0bf1d7d6326b4fbf6ddb8049977cbdbe333d0d1282dbb6f5927dfdf?d=identicon)[whleucka](/maintainers/whleucka)

###  Code Quality

TestsPHPUnit

### Embed Badge

![Health badge](/badges/hydrakit-event/health.svg)

```
[![Health](https://phpackages.com/badges/hydrakit-event/health.svg)](https://phpackages.com/packages/hydrakit-event)
```

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