根据环境自动装配symfony CacheInterface [英] Autowire symfony CacheInterface depending on environment

问题描述

我正在尝试在我的环境中使用其他缓存系统.例如，我想拥有 dev 的 Filesystem 和 pro 的 memcached .

I am trying to use different cache system on my environments. I would like to have, for example, Filesystem for dev and memcached for prod.

我正在使用 symfony 3.3.10 .

要实现此目的，我想按以下步骤自动连接 CacheInterface :

To achieve this, I would like to autowire the CacheInterface as follow:

use Psr\SimpleCache\CacheInterface;

class Api {

    public function __construct(CacheInterface $cache)
    {
        $this->cache = $cache;
    }
}

这是我的配置文件:

config_dev.yml :

framework:
    cache:
        app: cache.adapter.filesystem

config_prod.yml :

framework:
    cache:
        app: cache.adapter.memcached
        ...

这是我得到的错误:

将 FilesystemCache 声明为服务时，错误消失:

The error disappears when the FilesystemCache is declared as a service:

services:
    Symfony\Component\Cache\Simple\FilesystemCache: ~

但是现在我不能为 test 环境提供另一个缓存系统，例如 NullCache .实际上，我只需要声明一个从 CacheInterface 继承的服务.这是不可能的，因为 config_test 也在使用 config_dev .

But now I cannot have another cache system for the test environment like NullCache. In fact, I have to declare only one service inheriting from CacheInterface. It is not possible as config_test is using config_dev too.

这是 services.yml 的开始，如果有帮助的话:

This is the beginning of services.yml if it can help:

services:
    _defaults:
        autowire: true
        autoconfigure: true
        public: false

关于如何根据环境自动连接不同的缓存系统的任何想法吗?

这是有效的配置:

use Psr\Cache\CacheItemPoolInterface;

class MyApi
{
    /**
     * @var CacheItemPoolInterface
     */
    private $cache;

    public function __construct(CacheItemPoolInterface $cache)
    {
        $this->cache = $cache;
    }
}

config.yml :

framework:
    # ...
    cache:
        pools:
            app.cache.api:
                default_lifetime: 3600

services.yml :

# ...
Psr\Cache\CacheItemPoolInterface:
    alias: 'app.cache.api'

推荐答案

即使工厂模式是解决此类问题的一个不错的选择，但对于Symfony缓存系统，通常不需要这样做.改用 CacheItemPoolInterface 提示:

Even though factory pattern is a good option to solve this kind of problematic, normally you don't need to do that for Symfony cache system. Typehints CacheItemPoolInterface instead:

use Psr\Cache\CacheItemPoolInterface;

public function __construct(CacheItemPoolInterface $cache)

它会根据活动环境自动注入当前的 cache.app 服务，因此Symfony会为您完成这项工作！

It automatically inject the current cache.app service depending on the active environment, so Symfony does the job for you!

只需确保为每个环境配置文件配置 framework.cache.app :

Just make sure to configure the framework.cache.app for each environment config file:

# app/config/config_test.yml
imports:
    - { resource: config_dev.yml }

framework:
    #...
    cache:
        app: cache.adapter.null

services:
    cache.adapter.null:
        class: Symfony\Component\Cache\Adapter\NullAdapter
        arguments: [~] # small trick to avoid arguments errors on compile-time.

由于 cache.adapter.null 服务默认情况下不可用，因此您可能需要手动定义它.

As cache.adapter.null service isn't available by default, you might need define it manually.

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