OpenSymphony Cache

CRON expressions to expire content at specific dates and/or times. Pluggable EntryRefreshPolicy. Reduced memory consumption. Faster disk persistence. DiskPersistenceListener deadlocks are avoided if a process has no rights to delete the cache file. There is a new JSP tag _addgroups_, and an interface to get a list of the cache event listeners. The commons collection dependency has been removed. Java 1.3 support has been dropped.

Preserves more HTTP headers, e.g. the expires header. Custom cache key generation by subclassing CacheFilter or by implementing a special interface. Custom cache groups generation by subclassing CacheFilter or by implementing a special interface. Support for GZip filters in the filter chain. Avoids session creation for application scope pages. Multiple matching cache filters won't dead-lock the response anymore. The cache won't be served the same response twice before the client begins to cache it anymore.

This release updates the jgroups jar and
configuration, updates the documentation, adds a
HashDiskPersistenceListner that hashes file names in order
to eliminate nasty characters and overly long names, and
adds a property, cache.persistence.overflow.only, that
allows cache entries to only be persisted when the memory
capacity has been exceeded.

Many bugfixes were made and at least one new feature was added. The cache can now be configured to persist to disk only once the memory capacity has been expended.

There are many improvements over the 1.7.5 release. Some of the key new features include support for grouping of cache entries, entries or groups can now be flushed according to cron expressions, and caches can be distributed across a cluster. The cache configuration has been improved, the documentation has been overhauled, and many bugs have been fixed.