def __init__(self):
""" Kernel constructor. """
Kernel.instance = self
Kernel.__agentCounter = 0
self.__wPages = WhitePages()
self.__agents = []
self.__groups = {}
self.__roles = {}
class Kernel(object):
""" The core of the multi-agent system.
@cvar instance: The last created instance, for a global access (by all agents).
@type instance: C{L{Kernel}}
@cvar __agentCounter: Used for affect a new agent IDs. In each agent creation, it increments.
@type __agentCounter: C{int}
@ivar __wPages: Agent white pages for this kernel.
@type __wPages: C{L{WhitePages}}
@ivar __agents: Collection of agents in this kernel.
@type __agents: C{list<L{Agent}>}
@ivar __groups: Collection of groups and roles to access to agent IDs in this kernel. Dictionnary of groups (type C{str}) which point to a dictionnary of roles (type C{str}) which point to a list of agent ids (type C{int}).
@type __groups: C{dict<str, dict<str, list<int>>>}
@ivar __roles: Collection of agent IDs to access to groups and roles in this kernel. Dictionnary of agent IDs (type C{int}) which point to a list of couples (type C{tuple}) which contain a group (type C{str}) and a role (type C{str}).
@type __roles: C{dict<int, list<(str, str)>>}
@group Agent Management: addAgent, removeAgent, getAgent, getAgentId, getAgentNb
@group Message Management: sendMessage, sendBroadcastMessage
@group Organization Management: requestRole, leaveRole, leaveAllRoles, getGroupsOf, getGroups, getRoles, getRolesOf, getAgentsIn, getAgentsWith
"""
instance = None
__agentCounter = 0
def __init__(self):
""" Kernel constructor. """
Kernel.instance = self
Kernel.__agentCounter = 0
self.__wPages = WhitePages()
self.__agents = []
self.__groups = {}
self.__roles = {}
def stopKernel(self):
""" Shutdowns the kernel. Stops all agents living in this kernel. """
Kernel.instance = None
for agt in self.__agents:
self.removeAgent(self.getAgentId(agt))
# AGENT MANAGEMENT
def addAgent(self, agent, name="unamed", parent=None):
""" Launchs an agent in this kernel.
@param agent: Agent to launch.
@type agent: C{L{Agent}}
@param name: Name of the agent in the white pages (Optional).
@type name: C{str}
@param parent: Parent agent of the launched agent (Optional).
@type parent: C{L{Agent}}
"""
id = Kernel.__agentCounter
Kernel.__agentCounter = id + 1
self.__wPages.register(id, agent, name, parent)
self.__agents.append(agent)
self.__roles[id] = []
self.requestRole(id)
agent.kernel = self
agent.born()
def removeAgent(self, agentId):
""" Kills an agent from this kernel.
@param agentId: ID of the killed agent.
@type agentId: C{int}
"""
agent = self.__wPages.getAgent(agentId)
if agent != None:
agent.die()
agent.kernel = None
self.__agents.remove(agent)
self.__wPages.unregister(agentId)
self.leaveAllRoles(agentId)
del self.__roles[agentId]
def getAgentId(self, agent):
""" Gets the ID of a given agent.
@param agent: Agent which ID is wanted.
@type agent: C{L{Agent}}
@return: The corresponding ID or C{None} if the given agent is not launched in this kernel.
@rtype: C{int}
"""
return self.__wPages.getId(agent)
def getAgent(self, agentId):
""" Gets the agent corresponding to the given ID.
@param agentId: ID of the wanted agent.
@type agentId: C{int}
@return: The corresponding agent or C{None} if the ID does not exist in the kernel, or if corresponding agent has been killed.
@rtype: C{L{Agent}}
"""
return self.__wPages.getAgent(agentId)
def getAgentNb(self):
""" Gets the number of agents presently living in the kernel.
@return: The number of agents.
@rtype: C{int}
"""
return len(self.__agents)
# MESSAGE MANAGEMENT
def sendMessage(self, message):
""" Sends a message from an agent to another agent.
@param message: Message to send.
@type message: C{L{Message}}
"""
agent = self.__wPages.getAgent(message.receiver)
if agent != None:
agent.receiveMessage(message)
def sendBroadcastMessage(self, message):
""" Sends a message from an agent to all the agents of a role.
@param message: Message to send.
@type message: C{L{Message}}
"""
group, role = message.receiver
if group in self.__groups and role in self.__groups[group]:
for id in self.__groups[group][role]:
agent = self.__wPages.getAgent(id)
msg = message.__copy__()
msg.receiver = id
agent.receiveMessage(msg)
# ORGANIZATION MANAGEMENT
def requestRole(self, agentId, role=None, group=None):
""" Adds an agent into a role. Creates the role and/or the group if not already existing.
@note: All agents are automatically added into the common role at launching.
@param agentId: ID of the agent to add.
@type agentId: C{int}
@param role: Role in which agent is added (if C{role} and C{group} equal C{None}, agent is added in the common role).
@type role: C{str}
@param group: Group in which the role belongs to (if C{None}, the common group is used.
@type group: C{str}
"""
if group in self.__groups:
if role in self.__groups[group]:
self.__groups[group][role].append(agentId)
else:
self.__groups[group][role] = [agentId,]
else:
self.__groups[group] = {role: [agentId,]}
self.__roles[agentId].append((group, role))
def leaveRole(self, agentId, role=None, group=None):
""" Removes an agent from a role.
@note: All agents are automatically added into the common role at launching.
@param agentId: ID of the agent to remove.
@type agentId: C{int}
@param role: Role from which agent is removed (if C{role} and C{group} equal C{None}, agent is removed from the common role).
@type role: C{str}
@param group: Group in which the role belongs to (if C{None}, the common group is used.
@type group: C{str}
"""
if group in self.__groups:
if role in self.__groups[group]:
self.__groups[group][role].remove(agentId)
self.__roles[agentId].remove((group, role))
def leaveAllRoles(self, agentId):
""" Removes an agent from all roles of all groups. It includes the common role.
@param agentId: ID of the agent to remove.
@type agentId: C{int}
"""
for group, role in self.__roles[agentId]:
self.__groups[group][role].remove(agentId)
self.__roles[agentId] = []
def getGroupsOf(self, agentId):
""" Gets all the groups in which the given agent has a role.
@param agentId: ID of the concerned agent.
@type agentId: C{int}
@return: A collection of groups.
@rtype: C{list<str>}
"""
groups = []
for group, role in self.__roles[agentId]:
groups.append(group)
return groups
def getGroups(self):
""" Gets the existing groups created in the kernel.
@return: A collection of groups.
@rtype: C{list<str>}
"""
return self.__groups.keys()
def getRoles(self, group=None):
""" Gets the existing roles created in the kernel of the given group.
@param group: Group in which the roles are wanted (if C{None}, the common group is used).
@type group: C{str}
@return: A collection of roles.
@rtype: C{list<str>}
"""
return self.__groups.get(group, {}).keys()
def getRolesOf(self, agentId, group=None):
""" Gets all the roles in which an agent is, in a given group.
@param agentId: ID of the concerned agent.
@type agentId: C{int}
@param group: Group in which the roles are wanted (if C{None}, the common group is used).
@type group: C{str}
@return: A collection of roles.
@rtype: C{list<str>}
"""
roles = []
for grp, rol in self.__roles.get(agentId, ()):
if grp == group:
roles.append(rol)
return roles
def getAgentsIn(self, group=None):
""" Gets all the agent having one or more roles in the given group.
@param group: Group in which the agents are wanted (if C{None}, the common group is used).
@type group: C{str}
@return: A collection of agent IDs.
@rtype: C{list<int>}
"""
agents = []
roles = self.__groups.get(group, {})
for role in roles:
agents.extend(roles[role])
return agents
def getAgentsWith(self, role=None, group=None):
""" Gets all the agent having the given role.
@param role: Role in which the agents are wanted (if C{group} and C{role} equal C{None}, the common role is used).
@type role: C{str}
@param group: Group of the concerned role (if C{None}, the common group is used).
@type group: C{str}
@return: A collection of agent IDs.
@rtype: C{list<int>}
"""
return self.__groups.get(group, {}).get(role, ())[:]
