Unfortunately there's no built-in way of achieving what you want, but the shoal framework that Glassfish bases its clustering on could help you out here. You can solve the problem either by sending notifications to cluster members to update their caches or by replacing your current cache with a distributed one.
Below is an example using shoal to send notifications:
@Startup
@Singleton
public class Test {
private String groupName = "mygroup";
private String serverName = System.getProperty("HTTP_LISTENER_PORT");
private GroupManagementService gms;
@PostConstruct
public void init() {
Runnable gmsRunnable = GMSFactory.startGMSModule(serverName, groupName,
GroupManagementService.MemberType.CORE, null);
gms = (GroupManagementService) gmsRunnable;
try {
gms.join();
gms.addActionFactory(new MessageActionFactory() {
@Override
public Action produceAction() {
return new MessageAction() {
@Override
public void consumeSignal(Signal signal)
throws ActionException {
// Update your cache here
}
};
}
}, groupName);
} catch (GMSException e) {
Logger.getAnonymousLogger().severe(e.getMessage());
}
}
@PreDestroy
public void cleanup() {
gms.shutdown(GMSConstants.shutdownType.INSTANCE_SHUTDOWN);
}
/**
* Call this from your button click.
*/
public void updateCache() {
try {
byte[] message = new byte[] {};
gms.getGroupHandle().sendMessage(groupName, message);
} catch (GMSException e) {
Logger.getAnonymousLogger().severe(e.getMessage());
}
}
}
If you wanted to use a distributed cache instead:
DistributedStateCache cache = gms.getGroupHandle().getDistributedStateCache();
Items placed in the cache will be replicated to the other cluster nodes.
