README

This is a lightweight module system based on Aura.Di.

This library defines several classes that implement Aura\Di\ContainerConfigInterface so it can be used in any project that uses Aura.Di.

This is in early development so please provide feedback via Issues.

Installation and Autoloading

This package is installable and PSR-4 autoloadable via Composer as cadre/module.

Alternatively, download a release, or clone this repository, then map the Cadre\Module\ namespace to the package src/ directory.

Dependencies

This package requires PHP 7.0 or later; it has been tested on PHP 7.0 and PHP 7.1. We recommend using the latest available version of PHP as a matter of principle.

Quality

To run the unit tests at the command line, issue composer install and then vendor/bin/phpunit at the package root. This requires Composer to be available as composer, and PHPUnit to be available as vendor/bin/phpunit.

This package attempts to comply with PSR-1, PSR-2, and PSR-4. If you notice compliance oversights, please send a patch via pull request.

Example

$loader = new ModuleLoader([
    FirstModule::class,
    SecondModule::class,
], 'development', 'web');

$builder = new ContainerBuilder();
$di = $builder->newConfiguredInstance([$loader]);

$obj = $di->newInstance(ClassFromThirdModule::class);

use Aura\Di\Container;
use Cadre\Module\Module;

class FirstModule extends Module
{
    public function require()
    {
        if ($this->loader()->isContext('web')) {
            // Only require ThirdModule in the web context
            return [ThirdModule::class];
        } else {
            return [];
        }
    }

    public function define(Container $di)
    {
        $di->params[ClassFromFirstModule::class]['foo'] = 'bar';
    }
}

Cadre\Module\ModuleInterface

This interface extends Aura\Di\ContainerConfigInterface and defines four methods.

require()

Returns an array of class names of other modules that it requires.

conflict()

Returns an array of class names of other modules that it conflicts with.

replace()

Returns an array of class names of other modules that it replaces.

Cadre\Module\Module

This is a base class that your module can extend. It contains default implementations of all methods from Cadre\Module\ModuleInterface.

loader()

This method is only defined on Cadre\Module\Module and returns the associated Cadre\Module\ModuleLoaderInterface.

This is so you can conditionally configure your module based on the existance of other modules.

public function define(Container $di)
{
    if ($this->loader()->loaded(OtherModule::class)) {
        $di->set('service', $di->lazyNew(OtherService::class);
    } else {
        $di->set('service', $di->lazyNew(DefaultService::class);
    }
}

Cadre\Module\ModuleLoaderInterface

This interface extends Aura\Di\ContainerConfigInterface and defines three methods.

loaded($name)

Returns true or false if the module specified by $name has been loaded.

isEnv($environment)

Returns true or false if the ModuleLoader was instanciated with the specified environment.

isContext($context)

Returns true or false if the ModuleLoader was instanciated with the specified context.

Cadre\Module\ModuleLoader

This class does all the work. It contains default implementations of all methods from Cadre\Module\ModuleInterface.

__construct(array $modules, string $environment = '', string $context = '')

When you create a new ModuleLoader you pass into it the modules you want to load.

You may also specify the environment you're running. When you specify a environment we will check for a method requiring modules when in that environment. For example if your environment is "dev" we will look for a method requireDev.

To generate the method name we convert a snake cased (ex: special_environment) environment into a camel cased method name prefixed with "require" (ex: requireSpecialEnvironment).

You may also specify the context you're running. By default we do nothing with the context. However, you can query it via isContext method on the loader from inside a module. For example if your context is "web" you could query against it like if ($this->loader()->isContext('web')) { } and configure things differently.

protected resolveDependencies()

This method is called from loaded, define and modify.

It starts with the list of modules from the constructor and goes through them loading the modules and then adding require and optionally require{Environment} modules to the list to load.

Throws Cadre\Module\ConflictingModuleException if conflicting module is loaded. Throws Cadre\Module\AlreadyReplacedException if replaced module has already been replaced. Throws Cadre\Module\AlreadyLoadedException if replaced module has been loaded.

define(Container $di)

Passes through to the define method on all loaded modules.

modify(Container $di)

Passes through to the modify method on all loaded modules.

cadre / module

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