Understanding Offline Charging Events
14.4.3 Implementing Event-Based Charging
For an event-based charging request, the charging request is a one-time event and the session is automatically terminated upon receipt of the corresponding EVENT ACA message. The sendAndWaitlong timeout method can be used to synchronously send the EVENT request and block the thread until a response has been received from the CDF. Example 14–9 shows an example that uses an RfSession for sending an event-based charging request. Example 14–9 Event-Based Charging Using RfSession RfSession session = rfApp.createSession; ACR acr = session.createACRRecordType.EVENT; acr.addAvpCharging.SERVICE_INFORMATION, ...; ACA aca = acr.sendAndWait1000; if aca.getResultCode.isSuccess { ... send error response ... } For convenience, it is also possible send event-based charging requests using the RfApplication directly, as shown in Example 14–10 . Example 14–10 Event-Based Charging Using RfApplication ACR acr = rfApp.createEventACR; acr.addAvpCharging.SERVICE_INFORMATION, ...; ACA aca = acr.sendAndWait1000; Internally, the RfApplication creates an instance of RfSession associated with the ACR request, so this method is equivalent to creating the session explicitly. For both session and event based accounting, the RfSession class automatically handles creating session IDs, as well as updating the Accounting-Record-Number AVP used to sequence messages within the same accounting session. Using the Diameter Rf Interface API for Offline Charging 14-7 In the above cases the applications waits for up to 1000 ms to receive an answer from the CDF. If no answer is received within that time, the Diameter core delivers an UNABLE_TO_COMPLY error response to the application, and cancels the request. If no timeout is specified with sendAndWait, then the default request timeout of 30 seconds is used. This default value can be configured using the Diameter console extension.14.4.4 Using the Accounting Session State
The accounting session state for offline charging is serializable, so it can be stored as a SIP application session attribute. Because the client APIs are synchronous, it is not necessary to maintain any state for the accounting session once the Servlet has finished handling the call. For event-based charging events it is not necessary for the application to maintain any accounting session state because it is only used internally, and is disposed once the ACA response has been received. 14-8 Developers GuideParts
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