Class Factories

Purpose

This example shows how to use a Class Factory to generate three types of server:

• Singleton: all clients access a single server object.
• Single Call: server instances are created on demand and destroyed after processing the method call.
• Pooled: multiple server instances are accessible by clients. This factory works exactly the same as Singleton, unless the first server instance is busy.

Note: to test this sample properly, you need to run at least two clients.

Examine the Code

• See how the three services were defined by editing the service library. Do this by making the server the selected project and by using the menu option: RemObjects | Edit Service Library.
  Note: if you don't see this menu option but see 'Service Builder' instead, you still have the client set as the current project.
• The implementation of the three server types is held in three Impl.pas files: SingletonService_Impl, SingleCallService_Impl and PooledService_Impl.
• Examine the simple code needed to invoke the methods in ClassFactoryClientMain.pas.