SPADE: Agents based on XMPP

Javier Palanca
Smart Python Agent
Development Environment

SPADE
Smart Python Agent Dev Env
based on JABBER / XMPP

3
What is Jabber / XMPP?
Jabber is an open protocol based on XML for
instant messaging and presence notiﬁcation.
Project started at 1998 by Jeremie Miller.
●
First release at 2000.
Standardized by IETF and W3C for instant
messaging over the Internet.
Now is called XMPP for eXtensible Messaging
and Presence Protocol

4
How is Jabber?
Open, public and free
Standard
Tested
Decentralized
Secure
Extensible
Flexible
romeo@montesco.comjulieta@capuleto.com
capuleto.com montesco.com

5
Jabber in FIPA
<x xmlns=”jabber:x:fipa”>
Content
<message>
</message>
<body>
</body>
Content
Envelope

6
Presence Notification
Romeo
Mercuccio
Julieta
Mercuccio
Romeo
XMPP Server
Julieta
Romeo

What is SPADE?
๏ Agent platform + agent library
๏ An evolution of FIPPER (Aranda G., Palanca J.
2004)
๏ FIPA-compliant
๏ Based on the Jabber/XMPP protocol
๏ Presence notiﬁcation
๏ Multiplataform and Multilanguage
๏ Web-based interface

Platform
XMPP Server
AMS
DF
java
agent
python
agent
Host 1
python
agent
C++
agent
Host 2
other
agent
Host 3
P2P
IQ PresenceMessage
web user interface (WUI)
WUI WUI WUI WUI WUI

The Agent
from spade.Agent import Agent
class MyAgent(Agent):
def _setup(self):
print("Hello World")
agent = MyAgent(user, passwd)
agent.start()
Hello World
agent = autonomous program
libAgent
xmpp
RPC
SL0
RDF
P2P
Org
Content
Object
Clips
Social
Network
BDI AWUI
Agent Web UI

Agent Architecture
Mailbox
Templates
B BB
XMPP
IQ
Manager
Social
Network
Manager
IQ
Presence
Message
E
Behaviors Events
tpl.setPerformative("request")
tpl.setFrom(agent_jid)
tpl.setContent("any content")
tpl.setLanguage("RDF")

Behaviors
Cyclic
OneShot Periodic FSM
TimeOut
Event
๏ Threads execute in parallel
๏ Each behavior has its own mailbox
๏ Message Templates (envelope and body)
๏ Interaction Protocols using Templates

Life Cycle
Prologue
Epilogue
Based on Behaviors
def onStart(self):
def _process(self):
msg = self._receive(block=True)
reply = msg.createReply()
self.myAgent.send(reply)
def onEnd(self):

P2P
XMPP Server
java
agent
python
agent
python
agent
P2P
IQ
P2P
negotiation
negotiation
negotiation
XML object
self.myAgent.send(message, method="p2p")

My First Agent
https://pythonhosted.org/SPADE/
import spade
import time

class MyAgent(spade.Agent.Agent):
def _setup(self):
print("MyAgent starting...")

if __name__ == "__main__":
a = MyAgent("agent@127.0.0.1", "secret")
a.start()
while True:
try:
time.sleep(1)
except KeyboardInterrupt:
break
a.stop()
$ python configure.py 127.0.0.1
$ runspade.py
SPADE 2.3 <jpalanca@gmail.com> - https://
github.com/javipalanca/SPADE
Starting SPADE...... [done]
[info] WebUserInterface serving at port 8008
$ python myagent.py
MyAgent starting...

My First Behavior
import spade
import time
class MyAgent(spade.Agent.Agent):
class MyBehav(spade.Behaviour.Behaviour):
def onStart(self):
print("Starting behaviour…")
self.counter = 0
def _process(self):
print("Counter:", self.counter)
self.counter = self.counter + 1
time.sleep(1)
def _setup(self):
print("MyAgent starting…")
b = self.MyBehav()
self.addBehaviour(b, None)
if __name__ == "__main__":
a = MyAgent("agent@127.0.0.1", "secret")
a.start()
while True:
try:
time.sleep(1)
except KeyboardInterrupt:
break
a.stop()
$ python myagent.py
MyAgent starting...
Starting behaviour...
Counter: 0
Counter: 1
Counter: 2
Counter: 3
Counter: 4
Counter: 5
Counter: 6
Counter: 7
…

Sender and Receiver
# Sender Agent
import spade
class SenderAgent(spade.Agent.Agent):
class SendBehav(spade.Behaviour.OneShotBehaviour):
def _process(self):
receiver = spade.AID.aid(name=“receiver@127.0.0.1”,
addresses=[“xmpp://127.0.0.1”])

self.msg = spade.ACLMessage.ACLMessage()
self.msg.setPerformative("inform")
self.msg.setOntology("myOntology")
self.msg.setLanguage("OWL-S")
self.msg.addReceiver(receiver)
self.msg.setContent("Hello World")

self.myAgent.send(self.msg)
def _setup(self):
print "MyAgent starting . . ."
b = self.SendBehav()
self.addBehaviour(b, None)
# Receiver Agent
import spade
import time
class RecvAgent(spade.Agent.Agent):
class ReceiveBehav(spade.Behaviour.Behaviour):
def _process(self):
self.msg = None

self.msg = self._receive(block=False)

# Check wether the message arrived
if self.msg:
print("I got a message!")
else:
print("I waited but got no message")
time.sleep(1)
def _setup(self):
rb = self.ReceiveBehav()
template = spade.Behaviour.ACLTemplate()
template.setOntology("myOntology")
mt = spade.Behaviour.MessageTemplate(template)
self.addBehaviour(rb, mt)

Periodic
Magentix
C++
Conclusions
xmpp
RDF
SL0
P2P
Orgs
Clips
Social
Network BDI
WWW
OWL
Content
Object
java
python
events
SIMBA
HTTP
IQ
TimeOut
OneShot
FSM
Cyclic
Event
behavs
RPC

Collaborate with SPADE
• Free Software project (LGPL)
• Open to collaborations (please PULL REQUEST!)
• SPADE 3.0 roadmap:
‣ from scratch, asyncio, simpler, faster…
• Contact:
• web: http://github.com/javipalanca/spade
• email: jpalanca@dsic.upv.es

SPADE: Agents based on XMPP

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