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 service(self):
act_evt_map = self.local_endpoint._act_event_map
try:
act_event = act_evt_map.get_or_create_endpoint_called_event(
self.endpoint_making_call,self.event_uuid,
self.priority,self.result_queue)
except util.StoppedException:
self.result_queue.put(
waldoCallResults._StopAlreadyCalledEndpointCallResult())
return
import waldo.lib.waldoVariableStore
evt_ctx = waldoExecutingEvent._ExecutingEventContext(
self.local_endpoint._global_var_store,
# should not have any sequence local data from an endpoint
# call.
waldo.lib.waldoVariableStore._VariableStore(
self.local_endpoint._host_uuid) )
# receiving endpoint must know that this call was an endpoint
# call. This is so that it can ensure to make deep copies of
# all non-external arguments (including lists,maps, and user
# structs).
evt_ctx.set_from_endpoint_true()
exec_event = waldo.lib.waldoExecutingEvent._ExecutingEvent(
self.to_exec,act_event,evt_ctx,self.result_queue,
*self.args)
# don't start as separte thread
try:
exec_event.run()
except Exception as ex:
# if hasattr(ex,'waldo_handled'):
# # Already processed exception in put exception
# return
raise
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 handle_first_sequence_msg_from_partner(
self,msg,name_of_block_to_exec_next):
'''
ASSUMES ALREADY WITHIN LOCK
@param {PartnerMessageRequestSequenceBlock.proto} msg ---
@param {string} name_of_block_to_exec_next --- the name of the
sequence block to execute next.
@returns {Executing event}
means that the other side has generated a first message create
a new context to execute that message and do so in a new
thread.
'''
### FIGURE OUT WHAT TO EXECUTE NEXT
#### DEBUG
if name_of_block_to_exec_next == None:
util.logger_assert(
'Error in _ActiveEvent. Should not receive the ' +
'beginning of a sequence message without some ' +
'instruction for what to do next.')
#### END DEBUG
block_to_exec_internal_name = util.partner_endpoint_msg_call_func_name(
name_of_block_to_exec_next)
#### MAYBE DEBUG
# ("maybe" because we also may want to throw a Waldo error
# for this instead of just asserting out.)
if not hasattr(
self.event_parent.local_endpoint,block_to_exec_internal_name):
util.logger_assert(
'Error in _ActiveEvent. Received a request to ' +
'perform an unknown sequence step.')
#### END MAYBE DEBUG
to_exec = getattr(self.event_parent.local_endpoint,block_to_exec_internal_name)
### SET UP CONTEXT FOR EXECUTING
seq_local_var_store = waldoVariableStore._VariableStore(
self.event_parent.local_endpoint._host_uuid)
# FIXME: eventually, want to remove pickle-ing here
seq_local_var_store.incorporate_deltas(
self,msg.sequence_local_var_store_deltas)
evt_ctx = _ExecutingEventContext(
# already incorporated deltas for global_var_store
# above.
self.event_parent.local_endpoint._global_var_store,
seq_local_var_store)
evt_ctx.set_to_reply_with(msg.reply_with_uuid.data)
# used to actually start execution of context thread at end
# of loop. must start event outside of locks. That way,
# if the exec event leads to and endpoint call, etc., we
# don't block waiting on its return.
exec_event = _ExecutingEvent(
to_exec,self,evt_ctx,
None # using None here means that we do not need to
# bother with waiting for modified peered-s to
# update.
)
return exec_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
def create_context(endpoint):
seq_local_store = _VariableStore(endpoint._host_uuid)
return _ExecutingEventContext(
endpoint._global_var_store,
seq_local_store)
