com.knowgate.cache

Distributed Cache Peer

The distributed cache is used for keeping a local copy of frecuently accesed data at the web or apllication server reducing database accesses.

The cache coordinator is not necessary if you only have one client peer, or if different peers do not share any data that may be changed at runtime.

If there are multiple cache clients concurrently caching and updating the same data, for example in a web server farm where all web server use the same centralized database, then it will be necessary to install the cache coordinator in an application server such as JBoss or another EJB container accesible throught RMI.
The cache coordinator is supplied in a different package from cache client as both components are to be installed on different machines.

UML

Distributed Cache Local Peer

Each distributed cache peer holds its own local copy of cached data.

On the simplest scenenario there is only one client cache peer witch stores data localy for faster access and reduce network bandwitch consumption.

As data is kept localy at each peer, when more than one client peer concurrently access the same data, a cache coordinator becomes necessary.

The cache coordinator is an EJB that must be installed at an application server such as JBoss or BEA Weblogic.