def merge(self):
"""
Attempts to merge the packets into a single one, only if all threads had succeeded.
"""
self.exception = None
self.is_success = False
def failure():
self.is_success = False
self.exception = TransformationException()
self.exception.packet = NIL_PACKET
return NIL_PACKET
if len(self.success) == self.threads:
packet = self._custom_merge()
if packet is not None:
self.is_success = True
self.reset()
return packet
else:
packet = self._default_merge()
if packet is not None:
self.is_success = True
self.reset()
return packet
else:
return failure()
elif len(self.success) + len(self.fail) == self.threads:
self.is_success = False
return Random.choice(self.fail)
else:
return failure()
def select(self):
'''
Selects a packet randomly from the success list.
If the success list is empty, then from the fail list.
'''
self.exception = None
self.is_success = False
if len(self.success) > 0:
self.is_success = True
packet = Random.choice(self.success)
self.exclusions.append(packet.current)
return packet
elif len(self.fail) > 0:
self.is_success = False
return Random.choice(self.fail)
else:
self.is_success = False
#TODO: This should be a TransformationLanguageSpecificException
self.exception = TransformationException('No packet was received')
self.exception.packet = NIL_PACKET
return NIL_PACKET
def packet_in(self, packet):
self.exception = None
self.is_success = False
remaining_branches = range(len(self.branches))
original = packet.clone()
# Success on the first branch that is in success
while True:
if len(remaining_branches) == 0:
# They all failed
return packet
branch_no = Random.choice(remaining_branches)
branch = self.branches[branch_no]
packet = branch.packet_in(packet)
if not branch.is_success:
if branch.exception is not None:
self.exception = branch.exception
return packet
else:
# Ignore this branch for next try
remaining_branches.remove(branch_no)
packet = original
else:
self.is_success = True
return packet