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I recently had to sit down and figure out exactly how it works, and thought I’d take a moment to write it up. Because open source development is more about individuals than organisations, Wotif staff members don’t really have much to do with ehcache development. You can monitor cache hits and misses in detail by turning the logging for the up. it was initially written at Wotif, to overcome problems with the Jakarta JCS project. Since it was originally released, ehcache has grown somewhat and has a modest direct following. If you regularly see the same set of objects going in and out of the cache, you know you need a larger cache to be truly effective. In this part of the article about caching we’ll discuss using Eh Cache for a different purpose other than as Hibernate second level cache.Before working with Eh Cahe, I used a static variable for a cache.I use EHCache to maintain a mostly read-only cache of results from database queries. However, there is one table which needs an odd access method that is causing me grief.I hope someone with a knowledgeable eye could see what I am doing wrong, if anything.The write-through pattern mimics the structure of the cache-aside pattern when writing data.The difference is that you must implement the interface and configure the cache for write-through or write-behind.

The other thing to keep an eye on is how much the cache has no size limit – in theory, it could fill up your entire file system, particularly if you have your objects marked as eternal (which means they will never expire). Let’s go for a simple example: I have an Order object, which contains 3 Order Items.

This special table can be updated by other parties so customer needs a regular full refresh of the cache.

To achieve this I use a method that always checks to see if the cache has expired and if it has, rebuilds it.

Since it would be an Eh Cache type of cache, it would have the properties of the cache configured in the file, and we are especially interested in the expiration property if we want to refresh this cache at some interval.

The cache knows how to populate itself, after expiration it would again use the method to retrieve the new values, so the second problem of expiration would be solved.