Laravel - using CacheManager as a dependency - php

Question

I am trying to use CacheManager class as a dependency in my service:
<?php
declare(strict_types=1);
namespace App;
use GuzzleHttp\Client;
use Illuminate\Cache\CacheManager;
class MatrixWebService implements WebServiceInterface
{
public function __construct(Client $client, CacheManager $cache)
{
$this->client = $client;
$this->cache = $cache;
}
}
Because there can be multiple implementations of WebserviceInterface I need to define it in the AppServiceProvider accordingly:
$this->app->bind(WebServiceInterface::class, function () {
return new MatrixWebService(
new Client(),
$this->app->get(CacheManager::class)
);
});
The problem is when I am trying to use my service, Laravel is not able to resolve CacheManager class (there is some substitution for cache instead):
[2018-07-02 22:45:26] local.ERROR: Class cache does not exist {"exception":"[object] (ReflectionException(code: -1): Class cache does not exist at /var/www/html/vendor/laravel/framework/src/Illuminate/Container/Container.php:769)
[stacktrace]
#0 /var/www/html/vendor/laravel/framework/src/Illuminate/Container/Container.php(769): ReflectionClass->__construct('cache')
#1 /var/www/html/vendor/laravel/framework/src/Illuminate/Container/Container.php(648): Illuminate\\Container\\Container->build('cache')
#2 /var/www/html/vendor/laravel/framework/src/Illuminate/Container/Container.php(610): Illuminate\\Container\\Container->resolve('cache')
#3 /var/www/html/app/Providers/AppServiceProvider.php(28): Illuminate\\Container\\Container->get('Illuminate\\\\Cach...')
...
Any ideas on how to approach this correctly?

Answer 1

When your application has multiple implementations of an interface, contextual binding is useful:
namespace App;
use GuzzleHttp\Client;
use Cache\Repository;
class MatrixWebService implements WebServiceInterface
{
public function __construct(Client $client, Repository $cache)
{
$this->client = $client;
$this->cache = $cache;
}
}
// AppServiceProvider.php
public function register()
{
$this->app->bind(WebServiceInterface::class, MatrixWebServiceInterface::class);
// bind MatrixWebService
$this->app->when(MatrixWebService::class)
->needs(Repository::class)
->give(function () {
return app()->makeWith(CacheManager::class, [
'app' => $this->app
]);
});
// bind some other implementation of WebServiceInterface
$this->app->when(FooService::class)
->needs(Repository::class)
->give(function () {
return new SomeOtherCacheImplementation();
});
}