Relay Caches

The Relay cache acts as a middleman between the client application and the Relay system. The cache is a Java object that must be instantiated by client applications. When instantiated, the Relay cache object connects to a Relay server, starts a Listener thread, and registers the client application as an observer of the cache's data.

A major advantage to having the Relay cache as part of the client-side application is that it brings caching policies and behavior to the client machine. The Relay cache is downloaded with the client application, allowing a developer to change its implementation once for all clients.

The responsibilities of the Relay cache include:

1. storing shared state,
2. providing a view of shared state,
3. forwarding client-side updates to the Relay server,
4. processing received updates, and
5. notifying client applications when cached data has changed.

• Storing Shared State
• Providing A View of Shared State
• Forwarding Client-Side Updates
• Processing Received Updates
• Notification of Changes to Cached Data