Workflow features

Workflow features provide a formal mechanism to allow shared functionality to be implemented by external plugins.

use(featureName, …)

Calling use() on a Workflow Definition applies this feature to the workflow.

featureName is the name of the registered feature. The rest of the arguments are passed to the implementing plugin, and are used to configure the feature. Refer to the documentation for that feature.

For example,

EgWorkflow.use("std:notes", {
    canSeePrivateNotes: function(M, user) {
        return !M.hasRole(user, "researcher");
    }
});

P.workflow.registerWorkflowFeature(featureName, fn)

To register a workflow feature for other plugins, use P.workflow.registerWorkflowFeature().

featureName is the name of your feature, and fn is a function which will be called when another plugin calls use().

The arguments to fn are the workflow definition, and then any other arguments passed to use().

A feature which filters transitions might be implemented like this:

P.workflow.registerWorkflowFeature("example:check",
    function(workflow, config) {
        // Set up states, handlers, to implement this feature
        workflow.filterTransition(function(M, transition) {
            if(transition === config.transition) {
                if(!isTransitionAllowed()) {
                    return false;
                }
            }
        });
    }
);