Oracle Server E10293-02 Benutzerhandbuch

Seite von 108
Programming Guidelines  4-1
4
Programming Guidelines
This chapter describes programming guidelines for SIP Servlet applications in the 
following sections:
Introduction
For an application to take full advantage of OCMS as a JSR 116 SIP Servlet Application 
platform, observe the following recommendations.
Marking Applications as Distributable
For stateful applications, that is applications that save state in SipSessions or 
SipApplicationSessions, to be highly available in a SIP Application Server cluster, the 
sip.xml as well as the web.xml file must contain the <distributable> element. Marking 
applications as distributable will make sure that the application and session state is 
replicated to cluster nodes that will be able to resume execution of the session in the 
event of a failure of a cluster node.
There are performance implications related to how session state is replicated in a 
distributable environment. Replication is triggered each time there is a setAttribute() 
call on the session object, so large numbers of such calls in a servlet may impact 
performance. 
For OC4J there are additional requirements if the application is packaged as an 
Enterprise Archive. See the Oracle Communication and Mobility Server Administration 
Guide
 for details.