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Java Forum / General / April 2005cached backed or self-emptying map
I'm trying to cache objects that are expensive to load from the database, but I need the 'visible' object to be a Map so I can use it with JSTL. I set about extending AbstractMap and the 'get' method was easy, but I got stuck on the 'entrySet' method. The cache I'm using does not expose its underlying Map, which I understand... but I need that entrySet! The developers seem interested in working on it, so maybe they'll come up with a solution. Meanwhile, does anyone know of a good Java-based object cache that can answer the question "What's in the cache" at any point in time? Alternately, I could live with a Map that empties itself at midnight. Or something that I could schedule in Tomcat to replace a couple of context attributes with empty maps. I'm open to suggestions... Some code and notes as I work through this are posted here: http://wiki.wendysmoak.com/cgi-bin/wiki.pl?WhirlyCache  SignatureWendy Smoak Maybe I don't understand your problem but why won't a wrapped HashMap work? You just write the class to do the timing clean out at midnight. I've used a Map of Maps at several companies I've worked for. Also you may check out EHCache we use that here for our hibernate objects. > Maybe I don't understand your problem but why won't a wrapped HashMap > work? You just write the class to do the timing clean out at midnight. > I've used a Map of Maps at several companies I've worked for. It probably would for the self-cleaning Map, that was a recent idea, and I don't [yet] know how to write the timing part. I'm under the impression that starting new threads in a Servlet Container environment is frowned upon, so I want to make sure I don't break anything. I would rather leave the cache size and expiration up to someone who knows what they're doing... I'll check out EHCache, a quick look shows that it has several 'getKeys' methods. Thanks! SignatureWendy Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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