work in progress: rule handling

git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@2146 fd906abe-77d9-0310-91a1-e0d9ade77398

composer/rule/README.txt

@@ -8,6 +8,9 @@ Rule-based Execution of Actions
   >>> from cybertools.composer.rule.base import RuleManager, Rule, Action
   >>> from cybertools.composer.rule.base import EventType, Event
 
+  >>> from cybertools.composer.rule.instance import RuleInstance
+  >>> from cybertools.composer.rule.interfaces import IRuleInstance
+  >>> component.provideAdapter(RuleInstance, provides=IRuleInstance)
   >>> from cybertools.composer.rule.base import ActionHandler
   >>> component.provideAdapter(ActionHandler, name='message')
   >>> component.provideAdapter(ActionHandler, name='sendmail')
@@ -26,7 +29,8 @@ Rule-based Execution of Actions
 
   >>> manager.handleEvent(Event(loginEvent))
 
-  >>> client = object()
+  >>> from cybertools.composer.schema.client import Client
+  >>> client = Client()
 
   >>> manager.handleEvent(Event(checkoutEvent, client))
 

composer/rule/base.py

@@ -30,6 +30,7 @@ from cybertools.composer.base import Component, Element, Compound
 from cybertools.composer.base import Template
 from cybertools.composer.interfaces import IInstance
 from cybertools.composer.rule.interfaces import IRuleManager, IRule
+from cybertools.composer.rule.interfaces import IRuleInstance
 from cybertools.composer.rule.interfaces import IEvent, ICondition
 from cybertools.composer.rule.interfaces import IAction, IActionHandler
 from cybertools.util.jeep import Jeep
@@ -58,15 +59,19 @@ class RuleManager(object):
     def handleEvent(self, event):
         rules = self.getRulesForEvent(event)
         for r in rules:
-            for c in r.conditions:
-                cond = component.getAdapter(r, ICondition, name=c)
-                if not cond(event):
-                    continue
-            data = None
-            for action in r.actions:
-                handler = component.getAdapter(action, IActionHandler,
-                                               name=action.handlerName)
-                data = handler(data, event)
+            ri = IRuleInstance(event.context)
+            ri.template = r
+            ri.event = event
+            ri.applyTemplate()
+            #for c in r.conditions:
+            #    cond = component.getAdapter(r, ICondition, name=c)
+            #    if not cond(event):
+            #        continue
+            #data = None
+            #for action in r.actions:
+            #    handler = component.getAdapter(action, IActionHandler,
+            #                                   name=action.handlerName)
+            #    data = handler(data, event)
 
 
 class Rule(Template):
@@ -123,7 +128,7 @@ class Event(object):
 class Condition(object):
 
     implements(ICondition)
-    adapts(IRule)
+    adapts(IRuleInstance)
 
     def __init__(self, context):
         self.context = context
@@ -156,7 +161,7 @@ class Action(Component):
 class ActionHandler(object):
 
     implements(IActionHandler)
-    adapts(IAction)
+    adapts(IRuleInstance)
 
     def __init__(self, context):
         self.context = context

composer/rule/instance.py

@@ -22,22 +22,29 @@ Rule instance and related classes.
 $Id$
 """
 
-from string import Template
 from zope import component
-from zope.interface import implements
+from zope.component import adapts
+from zope.interface import Interface, implements
 
 from cybertools.composer.instance import Instance
-from cybertools.composer.interfaces import IInstance
+from cybertools.composer.rule.interfaces import IRuleInstance, IActionHandler
 
 
 class RuleInstance(Instance):
 
-    template = client = None
+    implements(IRuleInstance)
+    adapts(Interface)
 
-    def __init__(self, client, template):
-        self.client = client
-        self.template = template
+    event = None
 
     def applyTemplate(self, **kw):
-        pass
+        for c in self.template.conditions:
+            cond = component.getAdapter(self, ICondition, name=c)
+            if not cond():
+                continue
+        data = None
+        for action in self.template.actions:
+            handler = component.getAdapter(self, IActionHandler,
+                                           name=action.handlerName)
+            data = handler(data, self.event)
 

composer/rule/interfaces.py

@@ -26,7 +26,7 @@ from zope.interface import Interface, Attribute
 from zope.i18nmessageid import MessageFactory
 from zope import schema
 
-from cybertools.composer.interfaces import ITemplate, IComponent
+from cybertools.composer.interfaces import ITemplate, IComponent, IInstance
 
 _ = MessageFactory('zope')
 
@@ -83,6 +83,14 @@ class IRule(ITemplate):
     actions = Attribute('Sequence of actions to be carried out by this rule.')
 
 
+class IRuleInstance(IInstance):
+    """ A rule instance (typically used as an adapter) acts on some context
+        (client) object for executing the rule's actions.
+    """
+
+    event = Attribute('The event the rule instance was created for.')
+
+
 class IEvent(Interface):
 
     name = Attribute('The name by which the event will be identified.')
@@ -92,7 +100,7 @@ class IEvent(Interface):
 
 class ICondition(Interface):
 
-    def __call__(context, event, params):
+    def __call__(context, params):
         """ Should return True if the condition should be fulfilled;
             will allow the rule to call its actions.
         """