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2.8. Using Cache Loaders
Cache loaders are an important part of JBoss Cache. They allow persistence of nodes to disk or to remote cache clusters, and allow for passivation when caches run out of memory. In addition, cache loaders allow JBoss Cache to perform 'warm starts', where in-memory state can be preloaded from persistent storage. JBoss Cache ships with a number of cache loader implementations.
These cache loaders, along with advanced aspects and tuning issues, are discussed in the Chapter 9, Cache Loaders.
org.jboss.cache.loader.FileCacheLoader- a basic, filesystem based cache loader that persists data to disk. Non-transactional and not very performant, but a very simple solution. Used mainly for testing and not recommended for production use.org.jboss.cache.loader.JDBCCacheLoader- uses a JDBC connection to store data. Connections could be created and maintained in an internal pool (uses the c3p0 pooling library) or from a configured DataSource. The database this CacheLoader connects to could be local or remotely located.org.jboss.cache.loader.BdbjeCacheLoader- uses Oracle's BerkeleyDB file-based transactional database to persist data. Transactional and very performant, but potentially restrictive license.org.jboss.cache.loader.JdbmCacheLoader- an open source alternative to the BerkeleyDB.org.jboss.cache.loader.tcp.TcpCacheLoader- uses a TCP socket to "persist" data to a remote cluster, using a "far cache" pattern.org.jboss.cache.loader.ClusteredCacheLoader- used as a "read-only" cache loader, where other nodes in the cluster are queried for state. Useful when full state transfer is too expensive and it is preferred that state is lazily loaded.
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