def execute_old(self, variables, instances, outputqueue, p_list=None):
self.q = Queue()
# Copy the query array and obtain variables.
query = [
self.query.subject.value, self.query.predicate.value,
self.query.object.value
]
variables = list(variables)
# Instantiate variables in the query.
inst = {}
for i in variables:
inst.update({i: instances[i]})
#inst_aux = str(instances[i]).replace(" ", "%%%")
# Remove the %%% replacement as it does not work with the current LDF Server implementation
inst_aux = str(instances[i])
for j in (0, 1, 2):
if query[j] == "?" + i:
query[j] = inst_aux
tp = TriplePattern(Argument(query[0]), Argument(query[1]),
Argument(query[2]))
tp.sources = self.query.sources
# We need to handle the case that all variables are instatiated
vars = None
if tp.variable_position == 0:
vars = self.query.variables_dict
# Create process to contact sources.
aux_queue = Queue()
self.p = Process(target=contact_source,
args=(self.query.sources, tp, aux_queue, vars))
self.p.start()
sources = self.sources.keys()
if p_list:
p_list.put(self.p.pid)
# Ready and done vectors.
ready = self.sources_desc[self.sources.keys()[0]]
done = 0
# Get answers from the sources.
data = aux_queue.get(True)
while data != "EOF":
# TODO: Check why this is needed.
data.update(inst)
# Create tuple and put it in output queue.
outputqueue.put(Tuple(data, ready, done, sources))
# Get next answer.
data = aux_queue.get(True)
# Close the queue
aux_queue.close()
self.p.terminate()
outputqueue.put(Tuple("EOF", ready, done, sources))
def dict_to_logical(plan_dict, sources):
left = None
right = None
join = None
for key, value in plan_dict.items():
if key == 'right':
right = dict_to_logical(plan_dict['right'], sources)
if key == 'left':
left = dict_to_logical(plan_dict['left'], sources)
if key == 'type':
if value == 'NLJ':
join = Xnjoin
else:
join = Fjoin
if key == 'tpf':
pattern_var = re.compile(r'\?\w+')
pattern_uri = re.compile(r'\<[^<^>]+\>')
pattern_literal = re.compile(r'[\'"].*[\'"]@?\w*')
matches_var = pattern_var.finditer(value)
matches_uri = pattern_uri.finditer(value)
matches_literal = pattern_literal.finditer(value)
matches_var = [(m.start(), m.group(0)) for m in matches_var]
matches_uri = [(m.start(), m.group(0)) for m in matches_uri]
matches_literal = [(m.start(), m.group(0))
for m in matches_literal]
arguments = [matches_var, matches_uri, matches_literal]
arguments = proc_arguments(arguments)
triple_pattern = TriplePattern(Argument(arguments[0]),
Argument(arguments[1]),
Argument(arguments[2]))
cardinality = int(plan_dict.get("cardinality", 0))
triple_pattern.cardinality = cardinality
triple_pattern.sources = {sources[0]: cardinality}
print('--- Now printing Triple Pattern: ---')
print(triple_pattern)
print('------')
return LogicalPlan(triple_pattern)
print plan_dict
logical_plan = LogicalPlan(left, right, join)
logical_plan.cardinality = int(plan_dict.get("estimated_cardinality", 0))
return logical_plan
def contact_single_tpf_server_binding(server,
triple_pattern,
queue,
binding,
vars=None):
variables = vars # list(query.variables)
query = [
triple_pattern.subject.value, triple_pattern.predicate.value,
triple_pattern.object.value
]
if len(binding) > 1:
raise Exception("Too many bindings for TPF interface")
binding = binding[0]
# Instantiate variables in the query.
inst = {}
for i in variables:
inst.update({i: binding[i]})
inst_aux = str(binding[i])
if inst_aux.startswith("http://"):
inst_aux = "<{}>".format(inst_aux)
for j in (0, 1, 2):
if query[j] == "?" + i:
query[j] = inst_aux
tp = TriplePattern(Argument(query[0]), Argument(query[1]),
Argument(query[2]))
tp.sources = triple_pattern.sources
vars = None
if tp.variable_position == 0:
#vars = list(triple_pattern.get_variables())
vars = triple_pattern.variables_dict
count_requests = contact_single_tpf_server(server, tp, queue, vars,
binding)
return count_requests