PSR Cache Resolver

Dependencies

This cache resolver requires a PSR-6 implementation, e.g. `symfony/cache`, which can be installed by executing the following command in your project directory:

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$ composer require symfony/cache

Configuration

First, you need to setup the required services. In this example we're wrapping an instance of AmazonS3Resolver inside this resolver.

See the Symfony documentation on configuring caching for how to configure the PSR-6 caching implementation.

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# app/config/services.yml

services:
    acme.amazon_s3:
        class: AmazonS3
        arguments:
            -
                key:    "%amazon_s3.key%"
                secret: "%amazon_s3.secret%"

    acme.imagine.cache.resolver.amazon_s3:
        class: Liip\ImagineBundle\Imagine\Cache\Resolver\AmazonS3Resolver
        arguments:
            - "@acme.amazon_s3"
            - "%amazon_s3.bucket%"

    acme.imagine.psr_cache.resolver.amazon_s3.cache:
        class: Liip\ImagineBundle\Imagine\Cache\Resolver\PsrCacheResolver
        arguments:
            - "@cache.adapter.memcached"
            - "@acme.imagine.cache.resolver.amazon_s3"
            - { prefix: "amazon_s3" }
        tags:
            - { name: "liip_imagine.cache.resolver", resolver: "cached_amazon_s3" }

There are three options available:

• global_prefix: A prefix for all keys within the cache. This is useful to avoid colliding keys when using the same cache for different systems.
• prefix: A "local" prefix for this wrapper. This is useful when re-using the same resolver for multiple filters. This mainly affects the clear method.
• index_key: The name of the index key being used to save a list of created cache keys regarding one image and filter pairing.

Usage

After configuring PsrCacheResolver, you can set it as the default cache resolver for LiipImagineBundle using the following configuration.

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# app/config/config.yml

liip_imagine:
    cache: cached_amazon_s3

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# app/config/config.yml

liip_imagine:
    filter_sets:
        cache: ~
        my_thumb:
            cache: cached_amazon_s3
            filters:
                # the filter list