Fixed the new implementatoin of workflow methods. There were two issues. The...

Fixed the new implementatoin of workflow methods. There were two issues. The first one is that "once only" was method based rather than transition based. It is now transition based which is the only way which makes sense (method based in not deterministic). The second issue is that we did not call isWorkflowMethodSupported and that changed the original behaviour. We now call isWorkflowMethodSupported to stick to original behaviour and added a comment to suggest providing an option for "strict" behaviour. The code still needs to be tested and is commited now because it is already a kind of improvement.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@15973 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Base.py

@@ -124,37 +124,55 @@ class WorkflowMethod(Method):
       # should ne executed. - XXX
       return apply(self._m, (instance,) + args, kw) 
 
-    call_method = 0 # By default, this method was never called
-    if self._invoke_once:
-      # Check if this method has already been called in this transaction
-      # (only check this if we use once only workflow methods)
-      call_method_key = ('Products.ERP5Type.Base.WorkflowMethod.__call__', self._id, instance.getPhysicalPath())
+    # New implementation does not use any longer wrapWorkflowMethod
+    # but directly calls the workflow methods
+    wf = getToolByName(instance, 'portal_workflow', None)
+
+    # Build a list of transitions which may need to be invoked
+    instance_path = instance.getPhysicalPath()
+    portal_type = instance.portal_type
     transactional_variable = getTransactionalVariable(instance)
+    invoke_once_item_list = self._invoke_once.get(portal_type, {}).items()
+    valid_invoke_once_item_list = []
+    # Only keep those transitions which were never invoked
+    for wf_id, transition_list in invoke_once_item_list:
+      valid_transition_list = []
+      for transition_id in transition_list:
+        once_transition_key = ('Products.ERP5Type.Base.WorkflowMethod.__call__',
+                                wf_id, transition_id, instance_path)
         try:
-        call_method = transactional_variable[call_method_key]
+          already_called_transition = transactional_variable[once_transition_key]
         except KeyError:
-        transactional_variable[call_method_key] = 1
+          already_called_transition = 0
+          transactional_variable[once_transition_key] = 1
+        if not already_called_transition:
+          valid_transition_list.append(transition_id)
+      if valid_transition_list:
+        valid_invoke_once_item_list.append((wf_id, valid_transition_list))
+    candidate_transition_item_list = valid_invoke_once_item_list + \
+                                      self._invoke_once.get(portal_type, {}).items()
 
-    if call_method and not self._invoke_always:
-      # Try to return immediately if there are no invoke always workflow methods
+    # Try to return immediately if there are no transition to invoke
+    if not candidate_transition_item_list:
       return apply(self.__dict__['_m'], (instance,) + args, kw)
 
-    # Invoke transitions on appropriate workflow
-    portal_type = instance.portal_type # Access by attribute to prevent recursion
-    if call_method:
-      candidate_transition_item_list = self._invoke_always.get(portal_type, {}).items()
-    else:
-      candidate_transition_item_list = self._invoke_always.get(portal_type, {}).items() + \
-                                       self._invoke_once.get(portal_type, {}).items()
-
-    # New implementation does not use any longer wrapWorkflowMethod
-    wf = getToolByName(instance, 'portal_workflow', None)
+    # Prepare a list of transitions which should be invoked
+    #   this list is based on the results of isWorkflowMethodSupported
+    #   XXX - the behaviour of isWorkflowMethodSupported should be extended
+    #         some day so that a workflow method raises an exception
+    #         when it is invoked from a workflow state which does 
+    #         not support it or whenever guards reject it
+    valid_transition_item_list = []
+    for wf_id, transition_list in candidate_transition_item_list:
+      candidate_workflow = wf[wf_id]
+      valid_list = [transition_id for transition_id in transition_list
+                      if candidate_workflow.isWorkflowMethodSupported(instance, transition_id)]
+      if valid_list:
+        valid_transition_item_list.append((wf_id, valid_list))
 
     # Call whatever must be called before changing states
-    after_invoke_once = {}
     for wf_id, transition_list in candidate_transition_item_list:
-      after_invoke_once[wf_id] = wf[wf_id].notifyBefore(instance, self._id,
-                          args=args, kw=kw, transition_list=transition_list)
+       wf[wf_id].notifyBefore(instance, self._id, args=args, kw=kw, transition_list=transition_list)
 
     # Compute expected result
     result = apply(self.__dict__['_m'], (instance,) + args, kw)
@@ -184,14 +202,16 @@ class WorkflowMethod(Method):
     """
       Transitions registered as always will be invoked always
     """
-    self._invoke_always.setdefault(portal_type, {}).setdefault(workflow_id, []).append(transition_id)
+    transition_list = self._invoke_always.setdefault(portal_type, {}).setdefault(workflow_id, [])
+    if transition_id not in transition_list: transition_list.append(transition_id)
 
   def registerTransitionOncePerTransaction(self, portal_type, workflow_id, transition_id):
     """
       Transitions registered as one per transactions will be invoked 
       only once per transaction
     """
-    self._invoke_once.setdefault(portal_type, {}).setdefault(workflow_id, []).append(transition_id)
+    transition_list = self._invoke_once.setdefault(portal_type, {}).setdefault(workflow_id, [])
+    if transition_id not in transition_list: transition_list.append(transition_id)
 
 class ActionMethod(Method):
 
@@ -506,7 +526,9 @@ def initializePortalTypeDynamicWorkflowMethods(self, klass, ptype, prop_holder):
                     (method_id, str(work_method_holder)))
   # XXX This part is (more or less...) a copy and paste
   # We need to run this part twice in order to handle interactions of interactions
-  for wf in portal_workflow.getWorkflowsFor(self) * 2:
+  # ex. an interaction workflow creates a workflow method which matches
+  # the regexp of another interaction workflow
+  for wf in portal_workflow.getWorkflowsFor(self) * 2: # This is really necesary
     wf_id = wf.id
     if wf.__class__.__name__ in ('InteractionWorkflowDefinition', ):
       for tr_id in wf.interactions.objectIds():