By William Green, John D. Olson
Model nine of PowerBuilder introduces many gains designed particularly to combination the normal power of PowerBuilder as a swift Client/Server software improvement device with the hot and rising versions for disbursed program improvement. PowerBuilder builders desire PowerBuilder-specific details on interacting with Java software servers, comparable to WebSphere, WebLogic, and Sybase's company software Server (EAServer) and net provider improvement. This e-book provides the recent features of PowerBuilder nine besides the structure and styles required to create dispensed structures in PowerBuilder.
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Extra resources for PowerBuilder 9: Internet and Distributed Application Development
For example, when an Internet request comes through port 80, it notifies the socket, which in turn determines that it's connected to a Web server on that port, and then allows the communication to occur between the Web server and the communication initiator. The socket/port combination allows a socket to connect one application to many ports, but there can only be one connection on any given port. The port can also be told which communication protocol it will support; for example, TCP/IP, HTTP, and so forth.
When another call is made to the component, the server first checks to see if there is a pooled instance of the component available. The pooled component is reinstated rather than a new Create being executed. Any instance data that was previously set will still be set at this point. However, the component is handled as if it were destroyed and re-created, so if you are working with pooled component instances, you should take care to perform some cleanup in the component deactivate event to clean up any instance variable settings.
More plans were in the works though to make PowerBuilder a more mainstream development language for distributed components within more commercially available application servers. Additionally, the DPB application server components had to manage things such as transactions and security by developer-written code while the more commercial application servers featured these capabilities built into the server; in fact, EAServer has these features built-in and accessible by PowerBuilder components. Ultimately, the DPB Server was made obsolete so that the product focus could be maintained on EAServer.