def __init__(self, period):
Behaviour.PeriodicBehaviour.__init__(self, period)
self.goals = [] # active goals
self.plans = PlanList() # plan library
self.intentions = [] # selected plans for execution
#self.services = [] # services offered by the agent
self.TBCBP = tbcbp.TBCBP()
self.active_goals = FlexQueue()
self.prepared_goals = FlexQueue()
self.scheduler = Queue()
self._needDeliberate = True
class BDIBehaviour(Behaviour.PeriodicBehaviour):
#def __init__(self,agentjid, password, port=5222, debug=[], p2p=False):
# Agent.Agent.__init__(self,agentjid, password, port=port, debug=debug, p2p=p2p)
def __init__(self, period):
Behaviour.PeriodicBehaviour.__init__(self, period)
self.goals = [] # active goals
self.plans = PlanList() # plan library
self.intentions = [] # selected plans for execution
#self.services = [] # services offered by the agent
self.TBCBP = tbcbp.TBCBP()
self.active_goals = FlexQueue()
self.prepared_goals = FlexQueue()
self.scheduler = Queue()
self._needDeliberate = True
def configureKB(self, typ, sentence=None, path=None):
self.myAgent.kb.configure(typ, sentence, path)
def addBelieve(self, sentence, type="insert"):
self.myAgent.addBelieve(sentence, type)
self._needDeliberate = True
def removeBelieve(self, sentence, type="delete"):
self.myAgent.removeBelieve(sentence, type)
def askBelieve(self, sentence):
return self.myAgent.askBelieve(sentence)
def saveFact(self, name, sentence):
self.myAgent.kb.set(name, sentence)
self._needDeliberate = True
def getFact(self, name):
return self.myAgent.kb.get(name)
def addPlan(self, P, Q, inputs, outputs, services):
'''Adds a new plan to the Planner (TBCBP)
Usage: addPlan (P, Q, services)
P - precondition of the plan
Q - postcondition of the plan
services - list of services names (strings)
Return: None'''
cases = []
for s in services:
c = self.TBCBP.getCaseOfService(str(s))
if c is None:
self.myAgent.DEBUG("Plan was not added. Service " + str(s) + " does not exist.", "err", 'bdi')
return False
cases.append(c)
plan = tbcbp.Plan(cases)
self.TBCBP.addPlan(plan)
self.myAgent.DEBUG("Plan added: " + str(plan), "ok", 'bdi')
self._needDeliberate = True
return True
def addGoal(self, goal):
#First add the goal if no conflicts
if goal not in self.goals:
conflict = False
for g in self.goals:
if g.testConflict(goal):
conflict = True
break
if not conflict and self.askBelieve(goal.expression) is False:
self.myAgent.DEBUG("Goal added: " + str(goal), "ok", 'bdi')
self.goals.append(goal)
self._needDeliberate = True
def registerServiceInTBCBP(self, service, time=1):
'''Registers new service in the Planner (TBCBP)
Usage: registerService(service, time)
service - A DF.Service class
time - the estimated execution time of the service (optional)
Returns: None'''
self.TBCBP.registerService(service=service, time=time)
self._needDeliberate = True
def unregisterServiceInTBCBP(self, name=None, service=None):
if not name:
name = service.getName()
self.TBCBP.delService(name)
self._needDeliberate = True
def getPlan(self, goal):
'''Finds a plan for a specified goal.
If there is not an existing plan, it composes a new one (when possible)
Usage getPlan( goal )
goal - a Goal object to be achieved
Returns: TBCBP.Plan object or None is there is no available plan'''
self.myAgent.DEBUG("Composing a plan for goal " + str(goal), 'info', 'bdi')
plan = self.composePlan(goal)
if plan is None:
#goal is unreachable
self.myAgent.DEBUG("No plan found for Goal " + str(goal), 'warn', 'bdi')
return None
plan['index'] = 0
plan['goal'] = goal
plan.agent_owner = self.myAgent
return plan
def composePlan(self, goal, tout=-1):
'''
calls the Temporal-Bounded Case Based Planner
'''
return self.TBCBP.composePlan(goal, self.myAgent.kb, tout=20)
def selectIntentions(self):
'''
Prepares new plan for active goals
Looks for all prepared goals and selects a new plan for it.
then the goal is archived in prepared_goals
and the plan is stored in self.plans
'''
#while not self.prepared_goals.empty(): #return
goal = self.prepared_goals.get()
self.myAgent.DEBUG("Got goal " + str(goal), 'info', 'bdi')
if goal is not None:
if self.askBelieve(goal.expression) is True:
goal.done = True
return None # continue
if goal in self.active_goals:
return None # continue
self.myAgent.DEBUG("Activate Goal: " + str(goal), 'info', 'bdi')
plan = self.getPlan(goal)
if plan is not None:
#activate plan
self.myAgent.DEBUG("Got a plan for goal " + str(goal), 'info', 'bdi')
goal.selected = True
self.active_goals.put(goal)
plan.agent = self
#init plan
pid = self.plans.add(plan)
#activate first service
self.insertNextService(plan, pid)
self.planSelectedCB(plan)
else:
goal.unreachable = True
self.myAgent.DEBUG("Goal is Unreachable: " + str(goal), 'warn', 'bdi')
return None
def insertNextService(self, plan, pid):
'''Selects the next service of a plan to be executed
Usage: insertNextService( plan, pid)
plan - the running plan (TBCBP.Plan)
pid - the plan identifier'''
service_name = plan.getNextService()
self.myAgent.DEBUG("next service is " + str(service_name), 'info', 'bdi')
if service_name is None:
self.EndPlan(pid, plan)
return
service = self.TBCBP.getService(service_name)
if service:
service.pid = pid
service.agent_owner = self
self.scheduler.put(service)
else: # plan has finished
self.EndPlan(pid, plan)
def EndPlan(self, pid, plan):
'''Finishes the execution of a plan.
If the plan run well, its case is rewarded. Otherwise, it is punished.
Finally goal is setted as done and not active.
Usage: EndPlan ( pid, plan)
pid - Plan identifier
plan - TBCBP.Plan object
'''
del self.plans[pid]
#check its postcondition
if len(plan.getQ()) > 0 and self.askBelieve(plan.getQ()[0]) is False:
#logging.error(color_red+"PLAN FAILED "+str(plan)+color_none)
self.TBCBP.punish(plan.getCase())
for goal in self.goals: # deselect the goal that raised the plan
if goal.expression == plan.getQ():
goal.selected = False
goal.done = False
self.active_goals.remove(goal)
else:
self.TBCBP.reward(plan.getCase())
self.myAgent.DEBUG("Rewarding Plan", 'ok', 'bdi')
for goal in self.goals: # delete the goal that raised the intention
if goal.expression in plan.getQ():
if goal.persistent: # if goal is persistent, deselect it
self.prepared_goals.put(goal)
self.active_goals.remove(goal)
goal.done = True
goal.selected = False
self.myAgent.DEBUG("Goal " + str(goal.expression) + " was completed!", 'ok', 'bdi')
self.myAgent.DEBUG("Calling goal completed CB: " + str(self.goalCompletedCB), 'info', 'bdi')
self.goalCompletedCB(goal)
def EndService(self, service, plan):
'''Finishes the execution of a service.
If the service failed, it is punished and the plan is finished.
Otherwise, the next service of the plan is selected.
Usage: EndService ( service, plan)
service - the current running DF.Service
plan - the TBCBP.Plan where the service belongs
'''
agent = self
pid = plan.pid
#service has been executed
if len(service.getQ()) > 0 and self.askBelieve(service.getQ()[0]) is False:
#service failed
self.myAgent.DEBUG("Service execution failed: " + str(service.getQ()))
self.punishService(service)
#cancel plan and reactivate goal
self.EndPlan(pid, plan)
return
#5.2.1 select next service
self.insertNextService(plan, pid)
self.serviceCompletedCB(service)
def deliberate(self):
self.myAgent.DEBUG("deliberate about current goals: " + str(self.goals), 'info', 'bdi')
for goal in self.goals:
if (goal.unreachable is False) and (goal.done is False): # or ((goal.done==True) and (goal.persistent==True))):
if self.askBelieve(goal.expression) is False:
self.myAgent.DEBUG("Deliberate about " + str(goal), 'info', 'bdi')
if goal not in self.active_goals:
self.prepared_goals.put(goal)
else:
self.myAgent.DEBUG("Goal " + str(goal) + "is already in the KB: " + str(self.askBelieve(goal.expression)), 'warn', 'bdi')
goal.done = True
def discover(self):
#TODO: use PubSub features
s = DF.Service()
results = self.myAgent.searchService(s)
if results is not None:
self.myAgent.DEBUG("Discovered " + str(len(results)) + " services.", 'info', 'bdi')
for service in results:
if self.TBCBP.getService(service.getName()) is None:
self.registerServiceInTBCBP(service)
def punishService(self, service):
P = service.getP()
Q = service.getQ()
I = service.getInputs()
O = service.getOutputs()
self.TBCBP.punish(tbcbp.Case(P=P, Q=Q, inputs=I, outputs=O, services=[service.getName()]))
return
####Init The agent
###self._setup()
###self.behavioursGo.acquire()
###self._running = True
###self.behavioursGo.notifyAll()
###self.behavioursGo.release()
#############
# Main Loop #
#############
###while not self.forceKill():
### try:
### #get and process all messages
### self.getMessages()
def _onTick(self):
"""
periodic behaviour execution
"""
#discover new services
self.myAgent.DEBUG("Discover new services...", 'info', 'bdi')
self.discover()
#deliberate about current goals
#if self._needDeliberate:
self.myAgent.DEBUG("Deliberating...", 'info', 'bdi')
self.deliberate()
#self._needDeliberate = False
#select intentions
self.DEBUG("select intentions", 'info', 'bdi')
self.selectIntentions()
self.myAgent.DEBUG("Init scheduler", 'info', 'bdi')
#run a service each iteration
if not self.scheduler.empty():
service = self.scheduler.get()
self.myAgent.DEBUG("Got service for execution: " + str(service), 'info', 'bdi')
#if service!=None:
pid = service.pid
plan = self.plans[pid]
try:
result = self.myAgent.invokeService(service)
except:
self.myAgent.DEBUG("Service failed!", 'warn', 'bdi')
self.EndService(service, plan)
else:
self.myAgent.DEBUG("NOP", 'info', 'bdi')
self.myAgent.DEBUG("Restarting BDI cycle", 'info', 'bdi')
def planSelectedCB(self, plan):
#callback executed when a new plan is selected for execution
#must be overloaded
pass
def goalCompletedCB(self, goal):
#callback executed when a goal is completed succesfully
#must be overloaded
pass
def serviceCompletedCB(self, service):
#callback executed when a service is completed succesfully
#must be overloaded
pass
