How to add additional cache keys

Lets assume that some third-party extension has it’s own rendering logic for mobile users.

Usually it will be some method in extension’s helper: Mage::helper('module')->isMobile()

TM_Cache module has a special event to take this, or any other flag into consideretion, while cache entry is creating or loading.

Add the following code in third-party config.xml file (events section):

<tm_cache_prepare_cache_key>
    <observers>
        <VENDOR_MODULE_tmcache_key>
            <class>MODULE/observer</class>
            <method>tmcachePrepareCacheKey</method>
        </VENDOR_MODULE_tmcache_key>
    </observers>
</tm_cache_prepare_cache_key>

Here is an example of tmcachePrepareCacheKey method:

public function tmcachePrepareCacheKey($object)
{
    $params = $object->getParams();
    $params->addData(array(
        'MODULE_is_mobile' => Mage::helper('module')->isMobile()
    ));
}

That’s all. Now Full Page Cache module will depend on third-party module logic too.

How to add additional cache keys

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