The workflow API to retrieve the parameters programmatically?

Under JDev 11.1.1.2.0 + and the controller of the ADF, we have a requirement regarding access or exit from any defined task flow (BTF), to save the user, the BTF name and BTF key/value parameter.

The most ideal, I identified for this seems to be via method calls to bean on the properties of initializer/finalizer BTF. For purposes of keeping this simple message, I look at the code of the initializer.

Within the initializer, I can easily access the username and the name of the workflow is only a little more complicated by using the following code:

  ADFContext adfContext = ADFContext.getCurrent();
  SecurityContext securityContext = adfContext.getSecurityContext();
  String userName = securityContext.getUserName();

  ControllerContext controllerContext = ControllerContext.getInstance();
  ViewPortContext currentViewPort = controllerContext.getCurrentViewPort();
  TaskFlowContext taskFlowContext = currentViewPort.getTaskFlowContext();
  TaskFlowId taskFlowId = taskFlowContext.getTaskFlowId();
  String taskFlowName = taskFlowId.getFullyQualifiedName();

However generically retrieving incoming parameters proves more difficult. A solution hard is for the initializer code just 'know' the incoming parameters and extract them 1 by 1 by making explicit reference to each incoming parameter. Yet this hardcoded solution will be a pain in the butt that I'll need to check that all of my programmers BTF correctly extract and log each parameter, which will become a double-pain-in-the-stock maintenance, if other parameters are added at a later stage.

Ideally I'm wanting an API which reveals the list of parameters in order to browse and extract the values. Searching through TaskFlowContext, TaskFlowId and other classes, I don't see anything to do.

Another solution is to extract all the objects of the BTF #{pageFlowScope}. Yet it is a red herring, the initializer is called after the BTF own controlled beans are instantiated, implying that the pageFlowScope will include additional objects beyond the BTF parameter set that we want. As such, we need a way to distinguish beans controlled pageFlowScope for this useful parameters BTF method solution.

What is someone is aware of an API or a solution to retrieve the settings that do not require I hardcod the names of parameters extracted please?

With our thanks,

CM.

Hi Chris and all,.

Sorry for not being very active lately as this pretty much fall in my area of expertise. Would the following works for you:

FacesContext context = FacesContext.getCurrentInstance();
Application application = context.getApplication();
TaskFlowDefinition definition = MetadataService.getInstance().getTaskFlowDefinition(taskFlowId);
Map parameters = definition.getInputParameters();
for (TaskFlowInputParameter parameter : parameters.values())
{
    String name = parameter.getName();
    String expression = parameter.getValueExpression();
    Object value = application.evaluateExpressionGet(context, expression, Object.class);
    // Do something with the parameter
}

I hope that's what you're looking for as I am scanning the thread very fast atm and speed of reading often missing some subtleties.

Tags: Java

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