Suspend and Resume Calls 

 

Suspend and resume calls in Web Dynpro ABAP applications are useful if you want to navigate to a second application running stand-alone, without closing the first application. To make suspend and resume calls you can select any outbound or inbound plugs from the interface view of a Web Dynpro window to use as suspend or resume plugs. The suspend plug call is similar to an exit plug call in as much as both plugs are used to exit an active Web Dynpro ABAP application. The suspend plug is different from the Exit Plug because it enables you to return to the original application after you have used a second, stand-alone application. The original application is only temporarily deactivated or suspended; it is not shut down as it would be with an exit plug, and it can be reactivated by calling the resume plug.

You can set up a suspend plug in a Web Dynpro ABAP application to call:

• Another Web Dynpro application
• A Web application using a different technology (e.g. BSP).

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 Since suspend and resume plugs are used for communicating from the active application, they have to be added to the interface view of the window.

Each suspend plug has the URL parameter, which here is mandatory, not optional as it is with the exit plug. When a suspend plug is called, a target URL must be specified.

If at least one suspend plug is created for an interface view, one resume plug must also be created too. Without a resume plug an application cannot be reactivated once it has been suspended.   Only one resume plug can be defined for each Web Dynpro window.

 

Suspend Call to a Web Dynpro ABAP Application

 

 

It is easy to set up this suspend call: First select an outbound plug as the suspend plug in the primary WDA application. Call the plug, and as the value for the URL parameter specify a string that represents the URL of the target application (see the example code below).

method ONACTIONGO_SUSPENDING . data: L_REF_MAIN_WINDOW type ref to IG_MAIN_WINDOW . L_REF_MAIN_WINDOW =   WD_THIS->GET_MAIN_WINDOW_CTR( ).   L_REF_MAIN_WINDOW->FIRE_GO_SUSPENDING_PLG(     URL =   'http://…………/webdynpro/sap/my_secondary_wda'  ). endmethod..

The Web Dynpro application URL is defined as one of the application's properties on the relevant tab page of the application,  and it can be accessed from here.

 

When an exit plug is triggered in the secondary WDA application, this application is closed and the resume plug of the primary application is called automatically. Within the Web Dynpro framework a reference to the active instance of the primary application is always transferred in the suspend call. The secondary application knows its status as the subsequent application of a suspended primary application, and returns to the resume plug of the primary application when an exit plug is called using the specified reference.

In this case no further programming steps are necessary.

 

Suspend Call to a non-Web Dynpro ABAP Application

It is more difficult to create a suspend call to a non-WDA application because modifications are also required in the secondary application. For instance, you have to implement the mechanism for returning to the primary application. As well as specifying the address of the secondary application in the mandatory URL parameter, you have to also specify the URL of your own application for the subsequent return step. This is known as the resume URL and this is also transferred as the URL parameter to the secondary application.

The resume URL must be read in the secondary application. A redirect to the resume URL is then opened in the browser window of the secondary application.

 

 

With this URL the primary application is called using the resume plug, and reactivated.

 

 Suspend and resume plugs can have user-defined parameters. For more information, see Window: Inbound and Outbound Plugs.

 

 Suspend and resume calls are not released for use in a portal environment.