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Cache (expiration) (gallery-expiration-cache) on cdn

Last Updated: 04/17/13

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John Lindal

YUI Contributor

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Created: 03/8/12
Last CDN Push: 05/23/12
Build Tag: gallery-2012.05.23-19-56
Project: YUI 3
License: YUI BSD
YUI Version: 3.5.1
Free for use.

Cache which drops items based on a user-defined expiration criterion, e.g., age. The data store is configurable, so you can layer this on top of an MRU cache (http://yuilibrary.com/gallery/show/mru-cache) to limit both key lifetime and total memory.

Example of creating different types of expiration caches.

Code Sample

<script src="http://yui.yahooapis.com/3.5.1/build/yui/yui-min.js"></script>

YUI({
    //Last Gallery Build of this module
    gallery: 'gallery-2012.05.23-19-56'
}).use('gallery-expiration-cache', function(Y)
{
	// create a cache where all items expire after 1 hour (milliseconds)
	var time_cache = new Y.ExpirationCache({ expire: 3600000 });
 
	time_cache.put('foo', 'bar');
	var data = time_cache.get('foo');
 
	// create a cache where all items expire after 10 reads
	var usage_cache = new Y.ExpirationCache(
	{
		meta: function(value)
		{
			return {counter:0};
		},
		expire: function(meta, value)
		{
			meta.counter++;
			return (meta.counter > 10);
		}
	});
 
});