Cache Macro
 | Cache the content of the macro for some time |
| Type | JAR |
| Category | |
| Developed by | |
| Active Installs | 1 |
| Rating | |
| License | GNU Lesser General Public License 2.1 |
| Bundled With | XWiki Standard |
Table of contents
Description
Renders the cache macro content as wiki syntax once, then caches the result (the Abstract Syntax Tree (a.k.a XDOM) of the content is cached, after Macros have been executed) for some time and when this time expires, the content is recomputed again and put in cache again, and the cycle repeats.
Usage
content to cache here...
{{/cache}}
| Parameter Name | Mandatory? | Default Value | Description |
|---|---|---|---|
| id |  | The macro content itself | If specified use the id as the key to the cache. If not defined then the macro uses its content as the id. However this doesn't guarantee unicity since the same content could be located on several pages with different results. Also note that the id can contain wiki syntax; this is done so that the user can use script macros to generate the id. |
| timeToLive | | 300 seconds (5 minutes) | Set the cache duration for entries, in seconds. It's the number of seconds after which the cache entry will expire (since the last time it was used in 7.4M2 and since its insertion in the cache in 7.4M2). Currently the max time to live you can specify is 2147483647 seconds which corresponds roughly to 24855 days, i.e. 68 years. See the documentation for the maxEntries below for performance considerations. |
| maxEntries | | 1000 | The maximum number of cached entries in a given cache. |
Limitations
If you use script macros in the content of the cache macro then the scripts will be executed only once (just before they are cached). Thus if those scripts do some dynamic actions they'll be executed only once (just before the content is cached).
Some examples:
- If you get the current user in a script and display it, you'll always get the same value during the caching period even if another user is logged in.
- If you call some Skin Extension APIs (JSX, SSX) from within your script, then those Skin Extensions won't be called again during the caching period and thus you won't see their effects.
Examples
Force the usage of an id:
content to cache here...
{{/cache}}
Compute the id based on some script evaluation:
#set ($myid="somecomputeduniqueid")
{{/velocity}}
{{cache id="~{~{velocity~}~}$myid~{~{/velocity~}~}"}}
content to cache here...
{{/cache}}
Compute the id based on some URL parameter:
content to cache here...
{{/cache}}
Use a different time to Live (1 hour):
content to cache here...
{{/cache}}
A cache that auto-refreshes when the document's content is changed and a timeout of 1 day:
content to cache here...
{{/cache}}
Prerequisites & Installation Instructions
We recommend using the Extension Manager to install this extension (Make sure that the text "Installable with the Extension Manager" is displayed at the top right location on this page to know if this extension can be installed with the Extension Manager).
You can also use the manual method which involves dropping the JAR file and all its dependencies into the WEB-INF/lib folder and restarting XWiki.
Dependencies
Dependencies for this extension (org.xwiki.platform:xwiki-platform-rendering-macro-cache 16.9.0):
- org.xwiki.commons:xwiki-commons-cache-api 16.9.0
- org.xwiki.platform:xwiki-platform-security-requiredrights-macro 16.9.0
- org.xwiki.rendering:xwiki-rendering-api 16.9.0
- org.xwiki.rendering:xwiki-rendering-transformation-macro 16.9.0
