Custom Cache Resolver

You can define your own custom cache resolvers to handle cache resolution using your storage backend. Creating a custom cache resolver begins by creating a class that implements the ResolverInterface:

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interface ResolverInterface
{
    public function isStored($path, $filter);
    public function resolve($path, $filter);
    public function store(BinaryInterface $binary, $path, $filter);
    public function remove(array $paths, array $filters);
}

Once you have defined your custom cache resolver, you need to define it as a service and tag it with liip_imagine.cache.resolver:

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# app/config/services.yml

services:
    imagine.cache.resolver.my_custom:
        class: App\Service\MyCustomResolver
        arguments:
            - "@filesystem"
            - "@router"
        tags:
            - { name: "liip_imagine.cache.resolver", resolver: my_custom_cache }

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<!-- app/config/services.xml -->

<service id="imagine.cache.resolver.my_custom" class="App\Service\MyCustomResolver">
    <tag name="liip_imagine.cache.resolver" resolver="my_custom_cache" />
    <argument type="service" id="filesystem" />
    <argument type="service" id="router" />
</service>

Now your custom cache resolver can be set as the global default using the name defined in the resolver attribute of the tags key.

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liip_imagine:
    cache: my_custom_cache

Alternatively you can only set the custom cache resolver for just a specific filter set:

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liip_imagine:
    filter_sets:
        my_special_style:
            cache: my_custom_cache