def sequence_block(self,active_event=None,context=None):
'''
The first time that this function is called, it has neither an
active_event, nor a context. We create them.
'''
# keep track of whether this is the first message sent in a
# sequence so that we know whether or not we must force
# updating all the new sequence local data.
_first_msg = False
if active_event == None:
# create active event
active_event = self._act_event_map.create_root_event()
# create context
context = waldoExecutingEvent._ExecutingEventContext(
self._global_var_store,
# not using sequence local store
waldoVariableStore._VariableStore(self._host_uuid))
_first_msg = True
# Send messages back and forth to each other to decrement
# peered local data seq_local_num. Keep doing so until
# numero is negative.
peered_var = context.global_store.get_var_if_exists(
self.peered_number_var_name)
if peered_var.get_val(active_event) > 0: # keep sending messages until less than 0.
peered_var.write_val(active_event,peered_var.get_val(active_event) - 1)
# store each value as go through in array so that can
# check at the end that did in fact get sequential
# decrement of values.
global array_of_values
array_of_values.append(peered_var.get_val(active_event))
threadsafe_queue = Queue.Queue()
active_event.issue_partner_sequence_block_call(
context,'sequence_block',threadsafe_queue,_first_msg)
seq_msg_call_res = threadsafe_queue.get()
context.set_to_reply_with(seq_msg_call_res.reply_with_msg_field)
# apply changes to sequence variables. (There shouldn't
# be any, but it's worth getting in practice.) Note: that
# the system has already applied deltas for global data.
context.sequence_local_store.incorporate_deltas(
active_event,seq_msg_call_res.sequence_local_var_store_deltas)
# send more messages
to_exec_next = seq_msg_call_res.to_exec_next_name_msg_field
to_exec = getattr(self,to_exec_next)
to_exec(active_event,context)
# so that root can commit
return active_event
def new_event_and_write(self,var_name,var_val):
active_event = self._act_event_map.create_root_event()
# create context
context = waldoExecutingEvent._ExecutingEventContext(
self._global_var_store,
# not using sequence local store
waldoVariableStore._VariableStore(self._host_uuid))
var = context.global_store.get_var_if_exists(var_name)
var.write_val(active_event,var_val)
return active_event
def evt_r1(self,endpoint_a):
active_event = self._act_event_map.create_root_event()
# create context
context = waldoExecutingEvent._ExecutingEventContext(
self._global_var_store,
# not using sequence local store
waldoVariableStore._VariableStore(self._host_uuid))
threadsafe_queue = Queue.Queue()
active_event.issue_endpoint_object_call(
endpoint_a,'update_alpha_and_send_message',
threadsafe_queue)
endpoint_call_res = threadsafe_queue.get()
return active_event
def write_numero(self):
active_event = self._act_event_map.create_root_event()
# create context
context = waldoExecutingEvent._ExecutingEventContext(
self._global_var_store,
# not using sequence local store
waldoVariableStore._VariableStore(self._host_uuid),
)
var = context.global_store.get_var_if_exists(self.peered_number_var_name)
var_value = var.get_val(active_event)
var.write_val(active_event, var_value + 1)
var_value = var.get_val(active_event)
active_event.request_commit()
queue_elem = active_event.event_complete_queue.get()
return var_value
def endpoint_func(self,active_event,context,other_endpoint):
'''
The first time that this function is called, it has neither an
active_event, nor a context. We need to explicitly pass in
None for them.
'''
if active_event == None:
# create active event
active_event = self._act_event_map.create_root_event()
# create context
context = waldoExecutingEvent._ExecutingEventContext(
self._global_var_store,
# not using sequence local store
waldoVariableStore._VariableStore(self._host_uuid))
# Execute endpoint call back and forth. Keep doing so until
# numero is negative.
endpoint_var = context.global_store.get_var_if_exists(
self.endpoint_number_var_name)
if endpoint_var.get_val(active_event) > 0: # keep sending messages until less than 0.
endpoint_var.write_val(active_event,endpoint_var.get_val(active_event) - 1)
# store each value as go through in array so that can
# check at the end that did in fact get sequential
# decrement of values.
global array_of_values
array_of_values.append(endpoint_var.get_val(active_event))
threadsafe_queue = Queue.Queue()
active_event.issue_endpoint_object_call(
other_endpoint,'endpoint_func',
threadsafe_queue,self)
endpoint_call_res = threadsafe_queue.get()
# so that root can commit
return active_event
def new_event_and_read_numero(self):
'''
Create a new event that reads the value of the peered number
'numero.'
'''
active_event = self._act_event_map.create_root_event()
# create context
context = waldoExecutingEvent._ExecutingEventContext(
self._global_var_store,
# not using sequence local store
waldoVariableStore._VariableStore(self._host_uuid))
peered_var = context.global_store.get_var_if_exists(
self.peered_number_var_name)
var_value = peered_var.get_val(active_event)
# warning just assuming that commit goes through instead of
# retrying the event.
active_event.request_commit()
queue_elem = active_event.event_complete_queue.get()
return var_value
def evt_r2(self,endpoint_b):
active_event = self._act_event_map.create_root_event()
# create context
context = waldoExecutingEvent._ExecutingEventContext(
self._global_var_store,
# not using sequence local store
waldoVariableStore._VariableStore(self._host_uuid))
# first, call method on b
threadsafe_queue = Queue.Queue()
active_event.issue_endpoint_object_call(
endpoint_b,'update_beta',
threadsafe_queue)
endpoint_call_res = threadsafe_queue.get()
# call method on c, which calls method on a
threadsafe_queue = Queue.Queue()
active_event.issue_partner_sequence_block_call(
context,'receive_message_for_a',threadsafe_queue,True)
msg_call_res = threadsafe_queue.get()
return active_event
def sequence_block(self,active_event=None,context=None):
'''
The first time that this function is called, it has neither an
active_event, nor a context. We create them.
'''
seq_local_num_name = 'seq_local_num'
# keep track of whether this is the first message sent in a
# sequence so that we know whether or not we must force
# updating all the new sequence local data.
_first_msg = False
if active_event == None:
# create active event
active_event = self._act_event_map.create_root_event()
# create context
seq_local_store = waldoVariableStore._VariableStore(self._host_uuid)
seq_local_store.add_var(
seq_local_num_name,
wVariables.WaldoNumVariable(
seq_local_num_name,self._host_uuid,True,100))
context = waldoExecutingEvent._ExecutingEventContext(
self._global_var_store,seq_local_store)
_first_msg = True
# Send messages back and forth to each other to decrement
# sequence local data seq_local_num. Keep doing so until
# seq_local_num is negative.
local_var = context.sequence_local_store.get_var_if_exists(seq_local_num_name)
if local_var.get_val(active_event) > 0: # keep sending messages until less than 0.
local_var.write_val(active_event,local_var.get_val(active_event) - 1)
# store each value as go through in array so that can
# check at the end that did in fact get sequential
# decrement of values.
global array_of_values
array_of_values.append(local_var.get_val(active_event))
threadsafe_queue = Queue.Queue()
active_event.issue_partner_sequence_block_call(
context,'sequence_block',threadsafe_queue,_first_msg)
seq_msg_call_res = threadsafe_queue.get()
context.set_to_reply_with(seq_msg_call_res.reply_with_msg_field)
# apply changes to sequence local data. (global changes,
# which aren't applicable in this example, have already
# been applied.)
context.sequence_local_store.incorporate_deltas(
active_event,seq_msg_call_res.sequence_local_var_store_deltas)
# send more messages
to_exec_next = seq_msg_call_res.to_exec_next_name_msg_field
to_exec = getattr(self,to_exec_next)
to_exec(active_event,context)
else:
# at this point, should initiate the commit of data.
# print '\nComplete!!!\n'
pass