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future.py
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88 lines (70 loc) · 2.26 KB
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from msgpackrpc import error
class Future(object):
"""
This class is used as the result of asynchronous call.
By using join(), the caller is able to wait for the completion.
"""
def __init__(self, loop, timeout, callback=None):
self._loop = loop
self._error = None
self._result = None
self._set_flag = False
self._timeout = timeout
self._callback = callback
self._error_handler = None
self._result_handler = None
def join(self):
while (not self._set_flag):
self._loop.start()
def get(self):
self.join()
assert self._set_flag == True
if not self._set_flag:
# TODO: should be designed error !!
raise error.RPCError(128)
if self._result is not None:
if self._result_handler is None:
return self._result
else:
self._result_handler(self._result)
else:
if self._error is not None:
if self._error_handler is not None:
self._error_handler(self._error)
else:
if isinstance(self._error, error.RPCError):
raise self._error
else:
raise error.RPCError(self._error)
else:
return self._result
def set(self, error=None, result=None):
self._error = error
self._result = result
if self._callback is not None:
self._callback(self)
@property
def result(self):
return self._result
def set_result(self, result):
self.set(result=result)
self._set_flag = True
@property
def error(self):
return self._error
def set_error(self, error):
self.set(error=error)
self._set_flag = True
def attach_callback(self, callback):
self._callback = callback
def attach_error_handler(self, handler):
self._error_handler = handler
def attach_result_handler(self, handler):
self._result_handler = handler
# better name?
def step_timeout(self):
if self._timeout < 1:
return True
else:
self._timeout -= 1
return False