Progress Report April 18th

Workflow portlet

Workflow portlet application that utilizes extended GTLAB features to submit Scufl workflows. This portlet loads a Scufl workflow file, collects input values from end users, submits the workflow on Taverna, and monitors the results inside the GTLAB session framework.

Figure 1 illustrates the handling of Taverna tags within GTLAB. In this case, Taverna tags are embedded into JSF portlet page integrated with a Web form. End users only see the Web form with a few text fields and submit button. They never see the Grid tags and JSF tags that build the portlet page. This is common for all web applications. When the end user submits a web form through the portlet page, JSF intercepts this request and calls the associated action methods of Grid beans. Next, Grid beans load the appropriate Scufl document and input parameters to Taverna bean. Finally, the bean method starts execution of the workflow on Taverna enactor.

GTLAB assigns job handlers to each submitted workflow within the user session so that keeping track of the progression. In case of Taverna, the handlers synchronize with Taverna monitoring services to follow the workflow states.