Python tornado.concurrent() Examples

The following are 2 code examples of tornado.concurrent(). You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may also want to check out all available functions/classes of the module tornado , or try the search function .
Example #1
Source File: stream.py    From tchannel-python with MIT License 5 votes vote down vote up 
def read(self):

        def read_chunk(future):
            if self.exception:
                if self.exc_info:
                    future.set_exc_info(self.exc_info)
                else:
                    future.set_exception(self.exception)
                return future

            chunk = b""

            while len(self._stream) and len(chunk) < common.MAX_PAYLOAD_SIZE:
                new_chunk = self._stream.popleft()
                if six.PY3 and isinstance(new_chunk, str):
                    new_chunk = new_chunk.encode('utf8')
                chunk += new_chunk

            future.set_result(chunk)
            return future

        read_future = tornado.concurrent.Future()

        # We're not ready yet
        if self.state != StreamState.completed and not len(self._stream):
            wait_future = self._condition.wait()
            tornado.ioloop.IOLoop.current().add_future(
                wait_future,
                lambda f: f.exception() or read_chunk(read_future)
            )
            return read_future

        return read_chunk(read_future)
Example #2
Source File: stream.py    From tchannel-python with MIT License 5 votes vote down vote up 
def write(self, chunk):
        if self.exception:
            raise self.exception

        if self.state == StreamState.completed:
            raise UnexpectedError("Stream has been closed.")

        if chunk:
            self._stream.append(chunk)
            self._condition.notify()

        # This needs to return a future to match the async interface.
        r = tornado.concurrent.Future()
        r.set_result(None)
        return r