162 lines
5.4 KiB
Markdown
162 lines
5.4 KiB
Markdown
<p align="center">
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<img src="https://static.hoa-project.net/Image/Hoa.svg" alt="Hoa" width="250px" />
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</p>
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---
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<p align="center">
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<a href="https://travis-ci.org/hoaproject/event"><img src="https://img.shields.io/travis/hoaproject/event/master.svg" alt="Build status" /></a>
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<a href="https://coveralls.io/github/hoaproject/event?branch=master"><img src="https://img.shields.io/coveralls/hoaproject/event/master.svg" alt="Code coverage" /></a>
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<a href="https://packagist.org/packages/hoa/event"><img src="https://img.shields.io/packagist/dt/hoa/event.svg" alt="Packagist" /></a>
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<a href="https://hoa-project.net/LICENSE"><img src="https://img.shields.io/packagist/l/hoa/event.svg" alt="License" /></a>
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</p>
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<p align="center">
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Hoa is a <strong>modular</strong>, <strong>extensible</strong> and
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<strong>structured</strong> set of PHP libraries.<br />
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Moreover, Hoa aims at being a bridge between industrial and research worlds.
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</p>
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# Hoa\Event
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[](https://webchat.freenode.net/?channels=#hoaproject)
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[](https://gitter.im/hoaproject/central)
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[](https://central.hoa-project.net/Documentation/Library/Event)
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[](https://waffle.io/hoaproject/event)
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This library allows to use events and listeners in PHP. This is an observer
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design-pattern implementation.
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[Learn more](https://central.hoa-project.net/Documentation/Library/Event).
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## Installation
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With [Composer](https://getcomposer.org/), to include this library into
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your dependencies, you need to
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require [`hoa/event`](https://packagist.org/packages/hoa/event):
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```sh
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$ composer require hoa/event '~1.0'
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```
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For more installation procedures, please read [the Source
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page](https://hoa-project.net/Source.html).
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## Testing
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Before running the test suites, the development dependencies must be installed:
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```sh
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$ composer install
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```
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Then, to run all the test suites:
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```sh
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$ vendor/bin/hoa test:run
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```
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For more information, please read the [contributor
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guide](https://hoa-project.net/Literature/Contributor/Guide.html).
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## Quick usage
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We propose a quick overview of how to use events and listeners.
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### Events
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An event is:
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* **Asynchronous** when registering, because the observable may not exist yet
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while observers start to observe,
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* **Anonymous** when using, because the observable has no idea how many and
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what observers are observing,
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* It aims at a **large** diffusion of data through isolated components.
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Wherever is the observable, we can observe its data.
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In Hoa, an event channel has the following form:
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`hoa://Event/LibraryName/AnId:pseudo-class#anAnchor`. For instance, the
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`hoa://Event/Exception` channel contains all exceptions that have been thrown.
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The `hoa://Event/Stream/StreamName:close-before` contains all streams that are
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about to close. Thus, the following example will observe all thrown exceptions:
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```php
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Hoa\Event\Event::getEvent('hoa://Event/Exception')->attach(
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function (Hoa\Event\Bucket $bucket) {
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var_dump(
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$bucket->getSource(),
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$bucket->getData()
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);
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}
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);
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```
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Because `attach` expects a callable and because Hoa's callable implementation is
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smart, we can directly attach a stream to an event, like:
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```php
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Hoa\Event\Event::getEvent('hoa://Event/Exception')->attach(
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new Hoa\File\Write('Foo.log')
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);
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```
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This way, all exceptions will be printed on the `Foo.log` file.
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### Listeners
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Contrary to an event, a listener is:
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* **Synchronous** when registering, because the observable must exist before
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observers can observe,
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* **Identified** when using, because the observable knows how many observers
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are observing,
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* It aims at a **close** diffusion of data. The observers must have an access
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to the observable to observe.
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The `Hoa\Event\Listenable` interface requires the `on` method to be present to
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register a listener to a listener ID. For instance, the following example
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listens the `message` listener ID, i.e. when a message is received by the
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WebSocket server, the closure is executed:
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```php
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$server = new Hoa\Websocket\Server(…);
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$server->on('message', function (Hoa\Event\Bucket $bucket) {
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var_dump(
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$bucket->getSource(),
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$bucket->getData()
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);
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});
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```
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## Documentation
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The
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[hack book of `Hoa\Event`](https://central.hoa-project.net/Documentation/Library/Event) contains
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detailed information about how to use this library and how it works.
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To generate the documentation locally, execute the following commands:
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```sh
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$ composer require --dev hoa/devtools
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$ vendor/bin/hoa devtools:documentation --open
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```
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More documentation can be found on the project's website:
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[hoa-project.net](https://hoa-project.net/).
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## Getting help
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There are mainly two ways to get help:
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* On the [`#hoaproject`](https://webchat.freenode.net/?channels=#hoaproject)
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IRC channel,
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* On the forum at [users.hoa-project.net](https://users.hoa-project.net).
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## Contribution
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Do you want to contribute? Thanks! A detailed [contributor
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guide](https://hoa-project.net/Literature/Contributor/Guide.html) explains
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everything you need to know.
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## License
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Hoa is under the New BSD License (BSD-3-Clause). Please, see
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[`LICENSE`](https://hoa-project.net/LICENSE) for details.
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