As installed, the Oracle Commerce Platform default configuration enables event messaging for distributed TCP caching mode; you only need to ensure that the das_gsa_subscriber
table is properly created in your database.
Event server
All SQL repositories in a given Oracle Commerce Platform instance set their eventServer
property to the same event server component. The default component path is:
/atg/dynamo/server/SQLRepositoryEventServer
Event server ports
By default, each event server listens for cache invalidation events on a port that is randomly assigned by the operating system. Alternatively, you can set an event server component’s port
property to a permanent port number—for example, in order to bypass a firewall.
Event server connection timeout
Occasionally, an Oracle Commerce Platform instance’s event server is inaccessible—for example, the host machine has gone down. You can control the length of time allowed to establish a socket connection to an event server through its connectTimeout
property—by default, set to 60000 milliseconds.
If a connection attempt times out, the event server attempting to connect prints a warning message. Also, the routing information for the item descriptor on the unresponsive Oracle Commerce Platform instance is removed from das_gsa_subscriber
. The event server starts a new connection attempt after the time span specified in its connectRetryTimeout
property, initially set to 120000 milliseconds.
GSAEvent timeout
An event server determines whether other event servers are alive by their responses to the GSAEvents
that it sends. If an event server does not respond within the time span specified by its sendRemoteEventTimeout
property—by default, 60000 milliseconds—the sending event server assumes an invalid socket connection to the non-responding event server and drops the corresponding GSAConnection
from its connection table. It then attempts to reconnect within the time span specified by its connectTimeout
property.
An event server uses its sendRemoteEventTimeout
property only if its enableSendRemoteEventTimeout
property is set to true
(the default setting).