1. Developer Guide
  2. SIP Servlet Concurrency
  3. Specifying Concurrency Mode

Specifying Concurrency Mode

A SIP Servlet application can specify the required level of concurrency control Converged Application Server should apply while executing applications with the @SipApplication annotation or in the deployment descriptor. Converged Application Server supports two values for the ConcurrencyMode enum: VENDORSPECIFIC and APPLICATIONSESSION.

The following shows an example of a servlet specifying the concurrency mode.

Example 7-1 Setting the Concurrency Mode

package com.example;
import javax.servlet.sip.SipServlet;
@SipApplication (name = “SampleApplication", concurrencyMode = 
       ConcurrencyMode.APPLICATIONSESSION)

Table 7-1 lists the available concurrency modes.

Table 7-1 Concurrency Modes

Mode Description

VENDORSPECIFIC

Indicates that Converged Application Server can choose any concurrency level it deems appropriate. The level of guarantee of thread safety is determined by Converged Application Server. This is the default.

APPLICATIONSESSION

Indicates that Converged Application Server performs concurrency control at the level of the application session. It ensures that two messages belonging to the same application session are never processed simultaneously. It also ensures that various timer tasks or internal threads managed by Converged Application Server that access the application session are not executed at the same time.