Subversion-Projekte lars-tiefland.laravel_shop

<?php

namespace Illuminate\Foundation;

use Exception;

use Illuminate\Contracts\Foundation\Application as ApplicationContract;

use Illuminate\Filesystem\Filesystem;

class ProviderRepository

{

    /**

     * The application implementation.

     *

     * @var \Illuminate\Contracts\Foundation\Application

     */

    protected $app;

    /**

     * The filesystem instance.

     *

     * @var \Illuminate\Filesystem\Filesystem

     */

    protected $files;

    /**

     * The path to the manifest file.

     *

     * @var string

     */

    protected $manifestPath;

    /**

     * Create a new service repository instance.

     *

     * @param  \Illuminate\Contracts\Foundation\Application  $app

     * @param  \Illuminate\Filesystem\Filesystem  $files

     * @param  string  $manifestPath

     * @return void

     */

    public function __construct(ApplicationContract $app, Filesystem $files, $manifestPath)

    {

        $this->app = $app;

        $this->files = $files;

        $this->manifestPath = $manifestPath;

    }

    /**

     * Register the application service providers.

     *

     * @param  array  $providers

     * @return void

     */

    public function load(array $providers)

    {

        $manifest = $this->loadManifest();

        // First we will load the service manifest, which contains information on all

        // service providers registered with the application and which services it

        // provides. This is used to know which services are "deferred" loaders.

        if ($this->shouldRecompile($manifest, $providers)) {

            $manifest = $this->compileManifest($providers);

        }

        // Next, we will register events to load the providers for each of the events

        // that it has requested. This allows the service provider to defer itself

        // while still getting automatically loaded when a certain event occurs.

        foreach ($manifest['when'] as $provider => $events) {

            $this->registerLoadEvents($provider, $events);

        }

        // We will go ahead and register all of the eagerly loaded providers with the

        // application so their services can be registered with the application as

        // a provided service. Then we will set the deferred service list on it.

        foreach ($manifest['eager'] as $provider) {

            $this->app->register($provider);

        }

        $this->app->addDeferredServices($manifest['deferred']);

    }

    /**

     * Load the service provider manifest JSON file.

     *

     * @return array|null

     */

    public function loadManifest()

    {

        // The service manifest is a file containing a JSON representation of every

        // service provided by the application and whether its provider is using

        // deferred loading or should be eagerly loaded on each request to us.

        if ($this->files->exists($this->manifestPath)) {

            $manifest = $this->files->getRequire($this->manifestPath);

            if ($manifest) {

                return array_merge(['when' => []], $manifest);

            }

        }

    }

    /**

     * Determine if the manifest should be compiled.

     *

     * @param  array  $manifest

     * @param  array  $providers

     * @return bool

     */

    public function shouldRecompile($manifest, $providers)

    {

        return is_null($manifest) || $manifest['providers'] != $providers;

    }

    /**

     * Register the load events for the given provider.

     *

     * @param  string  $provider

     * @param  array  $events

     * @return void

     */

    protected function registerLoadEvents($provider, array $events)

    {

        if (count($events) < 1) {

            return;

        }

        $this->app->make('events')->listen($events, function () use ($provider) {

            $this->app->register($provider);

        });

    }

    /**

     * Compile the application service manifest file.

     *

     * @param  array  $providers

     * @return array

     */

    protected function compileManifest($providers)

    {

        // The service manifest should contain a list of all of the providers for

        // the application so we can compare it on each request to the service

        // and determine if the manifest should be recompiled or is current.

        $manifest = $this->freshManifest($providers);

        foreach ($providers as $provider) {

            $instance = $this->createProvider($provider);

            // When recompiling the service manifest, we will spin through each of the

            // providers and check if it's a deferred provider or not. If so we'll

            // add it's provided services to the manifest and note the provider.

            if ($instance->isDeferred()) {

                foreach ($instance->provides() as $service) {

                    $manifest['deferred'][$service] = $provider;

                }

                $manifest['when'][$provider] = $instance->when();

            }

            // If the service providers are not deferred, we will simply add it to an

            // array of eagerly loaded providers that will get registered on every

            // request to this application instead of "lazy" loading every time.

            else {

                $manifest['eager'][] = $provider;

            }

        }

        return $this->writeManifest($manifest);

    }

    /**

     * Create a fresh service manifest data structure.

     *

     * @param  array  $providers

     * @return array

     */

    protected function freshManifest(array $providers)

    {

        return ['providers' => $providers, 'eager' => [], 'deferred' => []];

    }

    /**

     * Write the service manifest file to disk.

     *

     * @param  array  $manifest

     * @return array

     *

     * @throws \Exception

     */

    public function writeManifest($manifest)

    {

        if (! is_writable($dirname = dirname($this->manifestPath))) {

            throw new Exception("The {$dirname} directory must be present and writable.");

        }

        $this->files->replace(

            $this->manifestPath, '<?php return '.var_export($manifest, true).';'

        );

        return array_merge(['when' => []], $manifest);

    }

    /**

     * Create a new provider instance.

     *

     * @param  string  $provider

     * @return \Illuminate\Support\ServiceProvider

     */

    public function createProvider($provider)

    {

        return new $provider($this->app);

    }

}