Application

Applications are the top-level element of the framework architecture. They contain the executable libraries (jar files), and each application can host several modules.

Characteristics

An application has the following characteristics:

• A name and ID ^[1]
  The ID is optional
  ^[2]
  See identification
• A deployment, which defines the jar files which contain the application code^[3]
  The deployment is not necessary if the application do not contain any Java module

Note on hosting modules

All Modules of an Application:

• Are processed in the same JVM
• Share the same set of data store for each Service^[4]
  This means that for modules which are hosted in the same Application, the framework does not have to copy the datas from one Module to another when a Service is invoked

Application configuration

An application XML configuration file contains:

• The name and identification of the application: these two elements must be unique for all applications in the framework
• The deployment of the application: this declares the Jar files which contain the Java code for the application^[5]
  Note that this part can be omitted if the application does not contain any Java modules
• The declaration of each module contained in the application

Example

In the following example, the Aircraft application hosts four modules:

• The InertialNavSystem module computes the current position of the aircraft
• The FlightManagementSystem module computes the Flight plan and sends the events during the aircraft route on the Flight plan
• The GuidanceSystem module computes the aircraft trajectory
• The Cockpit module

      <application name="Aircraft" id="1">
         <deployment>
            <lib url="aircraft.jar" />
         </deployment>
         <modules>
            <module name="InertialNavSystem" id="1" >
      ...
            </module>
            <module name="FlightManagementSystem" id="2" >
      ...
            </module>
            <module name="GuidanceSystem" id="3" >
      ...
            </module>
            <module name="Cockpit" id="4" >
      ...
            </module>
         </modules>
      </application>