def __init__(self, identifier, source, destination, amount, start_time,
controller):
self.identifier = identifier
self.source = source
self.destination = destination
self.amount = amount
self.total = amount
self.done = False
self.start_time = start_time
self.event_scheduler = None
self.logger = None
self.ack_tracker = PacketTracker()
assert isinstance(controller, CongestionController)
self.controller = controller
def __init__(self, identifier, source, destination, amount, start_time, controller):
self.identifier = identifier
self.source = source
self.destination = destination
self.amount = amount
self.total = amount
self.done = False
self.start_time = start_time
self.event_scheduler = None
self.logger = None
self.ack_tracker = PacketTracker()
assert isinstance(controller, CongestionController)
self.controller = controller
class Flow:
"""A flow to be simulated on the network
Attributes:
identifier: The unique identification of the flow
source: The source host
destination: The destination host
amount: The amount of data to be transmitted, in bytes
start_time: The time at which the flow simulation begins, in milliseconds
event_scheduler: A reference to the global event scheduler
complete: This flow has successfully transmitted all its data
controller: Instance of Congestion Controller.
"""
def __init__(self, identifier, source, destination, amount, start_time, controller):
self.identifier = identifier
self.source = source
self.destination = destination
self.amount = amount
self.total = amount
self.done = False
self.start_time = start_time
self.event_scheduler = None
self.logger = None
self.ack_tracker = PacketTracker()
assert isinstance(controller, CongestionController)
self.controller = controller
def __str__(self):
return ("Flow ID " + self.identifier + "\n"
"source: " + self.source.identifier + "\n"
"destination: " + self.destination.identifier + "\n"
"amount: " + str(self.amount) + " bytes\n"
"start_time: " + str(self.start_time) + " ms\n")
def set_logger(self, logger):
self.logger = logger
# Called by the FlowWakeEvent to allow the flow to continue sending packets
def wake(self):
if self.logger.clock.current_time == self.start_time:
self.logger.log_flow_started(self.identifier)
self.controller.wake()
def send_a_packet(self, packet_id, duplicate_num):
assert(self.amount > 0)
# numbers the packets in ascending order
# packet is uniquely identified by flow, packet number, and which
# duplicate of the packet it is
packet = PayloadPacket(packet_id, duplicate_num, self.identifier, self.source, self.destination, 1024, 64)
self.logger.log_flow_send_packet(self.identifier, packet)
self.source.send_packet(packet)
# Called by a link's host whenever an acknowledgement is received
def acknowledgement_received(self, packet):
assert isinstance(packet, AcknowledgementPacket)
assert packet.source == self.destination
assert packet.destination == self.source
self.ack_tracker.account_for_packet(packet.identifier)
self.amount = self.total - self.ack_tracker.total_count_received() * packet.payload_size
self.logger.log_flow_received_acknowledgement(self.identifier, packet, self.amount)
self.controller.acknowledgement_received(packet)
if (len(self.controller.not_acknowledged) == 0) and (not self.done):
self.logger.log_flow_completed(self.identifier)
self.done = True
def completed(self):
return self.done
class Flow:
"""A flow to be simulated on the network
Attributes:
identifier: The unique identification of the flow
source: The source host
destination: The destination host
amount: The amount of data to be transmitted, in bytes
start_time: The time at which the flow simulation begins, in milliseconds
event_scheduler: A reference to the global event scheduler
complete: This flow has successfully transmitted all its data
controller: Instance of Congestion Controller.
"""
def __init__(self, identifier, source, destination, amount, start_time,
controller):
self.identifier = identifier
self.source = source
self.destination = destination
self.amount = amount
self.total = amount
self.done = False
self.start_time = start_time
self.event_scheduler = None
self.logger = None
self.ack_tracker = PacketTracker()
assert isinstance(controller, CongestionController)
self.controller = controller
def __str__(self):
return ("Flow ID " + self.identifier + "\n"
"source: " + self.source.identifier + "\n"
"destination: " + self.destination.identifier + "\n"
"amount: " + str(self.amount) + " bytes\n"
"start_time: " + str(self.start_time) + " ms\n")
def set_logger(self, logger):
self.logger = logger
# Called by the FlowWakeEvent to allow the flow to continue sending packets
def wake(self):
if self.logger.clock.current_time == self.start_time:
self.logger.log_flow_started(self.identifier)
self.controller.wake()
def send_a_packet(self, packet_id, duplicate_num):
assert (self.amount > 0)
# numbers the packets in ascending order
# packet is uniquely identified by flow, packet number, and which
# duplicate of the packet it is
packet = PayloadPacket(packet_id, duplicate_num, self.identifier,
self.source, self.destination, 1024, 64)
self.logger.log_flow_send_packet(self.identifier, packet)
self.source.send_packet(packet)
# Called by a link's host whenever an acknowledgement is received
def acknowledgement_received(self, packet):
assert isinstance(packet, AcknowledgementPacket)
assert packet.source == self.destination
assert packet.destination == self.source
self.ack_tracker.account_for_packet(packet.identifier)
self.amount = self.total - self.ack_tracker.total_count_received(
) * packet.payload_size
self.logger.log_flow_received_acknowledgement(self.identifier, packet,
self.amount)
self.controller.acknowledgement_received(packet)
if (len(self.controller.not_acknowledged) == 0) and (not self.done):
self.logger.log_flow_completed(self.identifier)
self.done = True
def completed(self):
return self.done