Http Cache - Configuration Extensions / Custom Key Factories

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Cache config (com.adobe.acs.commons.httpcache.config.HttpCacheConfig) can be extended through implementation of config extension (com.adobe.acs.commons.httpcache.config.HttpCacheConfigExtension). A typical developer use-case (but not limited to) for this is to achieve caching of personalized requests. User group based implementation of cache config extension

The following config extensions are provided OOTB:

• com.adobe.acs.commons.httpcache.config.impl.GroupHttpCacheConfigExtension authenticated user group cache rules / personalization.
• com.adobe.acs.commons.httpcache.config.impl.ResourceTypeHttpCacheConfigExtension resource type / path based cache rules
• com.adobe.acs.commons.httpcache.config.impl.RequestParameterHttpCacheConfigExtension request parameter based cache rules / personalization
• com.adobe.acs.commons.httpcache.config.impl.RequestCookieHttpCacheConfigExtension request cookie based cache rules / personalization
• com.adobe.acs.commons.httpcache.config.impl.RequestHeaderHttpCacheConfigExtension request header based cache rules / personalization
• com.adobe.acs.commons.httpcache.config.impl.ValueMapValueHttpCacheConfigExtension request resource’s value map values based cache rules
• com.adobe.acs.commons.httpcache.config.impl.CombinedCacheConfigExtension allows you to combine multiple extensions into 1 to promote reuse

All of the above are compatible with the JCR cache (Serializable).
Relation between HttpCacheConfig and HttpCacheConfigExtension established through OSGi reference target filter cacheConfigExtension.target at com.adobe.acs.commons.httpcache.config.impl.HttpCacheConfigImpl.

Example OOTB config extension / key factories configurations:

com.adobe.acs.commons.httpcache.config.impl.GroupHttpCacheConfigExtension-uniquename.xml

<?xml version="1.0" encoding="UTF-8"?>
<jcr:root xmlns:sling="http://sling.apache.org/jcr/sling/1.0" xmlns:cq="http://www.day.com/jcr/cq/1.0"
    xmlns:jcr="http://www.jcp.org/jcr/1.0" xmlns:nt="http://www.jcp.org/jcr/nt/1.0"
    jcr:primaryType="sling:OsgiConfig"
	configName="unique-name"
	httpcache.config.extension.user.groups.allowed="[group1, group2]"
 />
 

This extension config will tell the engine only to cache a response, if the request is authenticated in AEM, and the usergroup is ‘group1’ or ‘group2’. The factory will create exactly 2 variants per request’s resource, group1 and group2.

com.adobe.acs.commons.httpcache.config.impl.ResourceTypeHttpCacheConfigExtension-myresourceconfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<jcr:root xmlns:sling="http://sling.apache.org/jcr/sling/1.0" xmlns:cq="http://www.day.com/jcr/cq/1.0"
    xmlns:jcr="http://www.jcp.org/jcr/1.0" xmlns:nt="http://www.jcp.org/jcr/nt/1.0"
    jcr:primaryType="sling:OsgiConfig"
	configName="my-resource-config"
	httpcache.config.extension.paths.allowed="['/content/acs-commons/mycontainerpage/(.*)/jcr:content/(.*)']"
	httpcache.config.extension.resourcetypes.allowed="['/apps/acs-commons/components/my-cacheable-component']" 	
 />
 

This extension config will tell the engine only to cache a response, if the request’s resource has a resource type of /apps/acs-commons/components/my-cacheable-component, and the path matches the regex /content/acs-commons/mycontainerpage/(.*)/jcr:content/(.*). The factory will in this case create only 1 variant per request’s resource.

Added since 4.0.0:

com.adobe.acs.commons.httpcache.config.impl.RequestParameterHttpCacheConfigExtension-myrequestparameterconfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<jcr:root xmlns:sling="http://sling.apache.org/jcr/sling/1.0" xmlns:cq="http://www.day.com/jcr/cq/1.0"
    xmlns:jcr="http://www.jcp.org/jcr/1.0" xmlns:nt="http://www.jcp.org/jcr/nt/1.0"
    jcr:primaryType="sling:OsgiConfig"
    configName="my-request-parameter-config"
    allowedKeys="[pageView,page]" 
    allowedValues="[pageView=compact|medium|large]"
    emptyAllowed="{Boolean}false"
 />
 

This extension config will tell the engine only to cache a response, if the request has the request parameters pageView (must be of value compact,medium or large) and page (any value). The factory will create a variant of the request’s resource of each possible combination of pageView / page query parameters that is requested.

com.adobe.acs.commons.httpcache.config.impl.RequestCookieHttpCacheConfigExtension-myrequestcookieconfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<jcr:root xmlns:sling="http://sling.apache.org/jcr/sling/1.0" xmlns:cq="http://www.day.com/jcr/cq/1.0"
    xmlns:jcr="http://www.jcp.org/jcr/1.0" xmlns:nt="http://www.jcp.org/jcr/nt/1.0"
    jcr:primaryType="sling:OsgiConfig"
    configName="my-request-cookie-config"
    allowedKeys="[myCustomUserGroupFromMiddleware]" 
    allowedValues="[myCustomUserGroupFromMiddleware=superUser|normal|loyalUser]"
    emptyAllowed="{Boolean}true"
 />
 

This extension config will tell the engine only to cache any response, because emptyAllowed is set to true. However, the factory will create a cache variant for a non-match (standard), but also for the request’s that have the request cookie myCustomUserGroupFromMiddleware with these exact values: superUser, normal, loyalUser. This allows you to serve different cached content for these requests but also cached content for normal requests.

com.adobe.acs.commons.httpcache.config.impl.RequestHeaderHttpCacheConfigExtension-myrequestheaderconfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<jcr:root xmlns:sling="http://sling.apache.org/jcr/sling/1.0" xmlns:cq="http://www.day.com/jcr/cq/1.0"
    xmlns:jcr="http://www.jcp.org/jcr/1.0" xmlns:nt="http://www.jcp.org/jcr/nt/1.0"
    jcr:primaryType="sling:OsgiConfig"
    configName="my-request-header-config"
    allowedKeys="[my-custom-header]" 
    emptyAllowed="{Boolean}false"
 />
 

This extension config will tell the engine only to cache a response, if the request has the request header my-custom-header (any value). The factory will create a variant of the request’s resource of each my-custom-header value. Important! Use this in combination with other config restrictions when using a JCR store, otherwise, this opens up the possibility to flood the server by spamming requests with diffferent header values.

com.adobe.acs.commons.httpcache.config.impl.ValueMapValueHttpCacheConfigExtension-myvaluemapconfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<jcr:root xmlns:sling="http://sling.apache.org/jcr/sling/1.0" xmlns:cq="http://www.day.com/jcr/cq/1.0"
    xmlns:jcr="http://www.jcp.org/jcr/1.0" xmlns:nt="http://www.jcp.org/jcr/nt/1.0"
    jcr:primaryType="sling:OsgiConfig"
    configName="my-valuemap-config"
    allowedKeys="[resourceIsCacheAble]" 
    allowedValues="[resourceIsCacheAble={Boolean}true]"
    emptyAllowed="{Boolean}false"
 />
 

This extension config will tell the engine only to cache a response, if the request’s resource has a Boolean property named resourceIsCacheAble that is set to true. Useful when you want to put a flag enable or disabling caching from the author view.

com.adobe.acs.commons.httpcache.config.impl.CombinedCacheConfigExtension-combinedgroupandresourceconfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<jcr:root xmlns:sling="http://sling.apache.org/jcr/sling/1.0" xmlns:cq="http://www.day.com/jcr/cq/1.0"
    xmlns:jcr="http://www.jcp.org/jcr/1.0" xmlns:nt="http://www.jcp.org/jcr/nt/1.0"
    jcr:primaryType="sling:OsgiConfig"
    configName="combined-group-and-resource-config"
    cacheConfigExtension.target="(|(service.factoryPid=com.adobe.acs.commons.httpcache.config.impl.ValueMapValueHttpCacheConfigExtension)(configName=my-valuemap-config)(((service.factoryPid=com.adobe.acs.commons.httpcache.config.impl.RequestCookieHttpCacheConfigExtension)(configName=my-request-cookie-config)" 
    cacheKeyFactory.target="(|(service.factoryPid=com.adobe.acs.commons.httpcache.config.impl.ValueMapValueHttpCacheConfigExtension)(configName=my-valuemap-config)(((service.factoryPid=com.adobe.acs.commons.httpcache.config.impl.RequestCookieHttpCacheConfigExtension)(configName=my-request-cookie-config))" 
    emptyAllowed="{Boolean}false"
 />
 

This extension config will aggregate multiple cache configs into 1 (Using LinkedList) and apply all of these to the config. Handy if you need the functionality of multiple OOTB config extensions in your config, or if you need these and a project-specific extension as well. For instance (example above): You need the ValueMapValueHttpCacheConfigExtension because you want to check for resourceIsCacheAble equals true, and then ALSO to provide different cached entries for the request cookie value myCustomUserGroupFromMiddleware. Using the example above, this can be done without writing your own extension code, but just with 3 sling:OsgiConfig files.