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How to call the tornado.queues message externally


How to call the tornado.queues message externally

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How to call the tornado.queues message externally
Tag : python , By : vbanos
Date : November 27 2020, 03:01 PM

hop of those help? tornado.queue.Queue is not thread-safe and is intended for use within Tornado applications which are generally single-threaded and event-driven. You need to do one of two things:
# b.py
import a
@gen.coroutine
def f():
    while True:
        print((yield a.que.get())
# a.py
que = queue.Queue()
executor = concurrent.futures.ThreadPoolExecutor()
@gen.coroutine
def connect(self):
    ws = yield websocket_connect(...)
    while True:
        msg = yield ws.read_message()
        que.put_nowait(msg)
        print((yield executor.submit(que.get)))

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What distributed message queues support millions of queues?


Tag : development , By : Rb.Ridge
Date : March 29 2020, 07:55 AM
around this issue From your description, it looks like OMG's Data Distribution Service could be a good fit. It is related to message queueing technologies, but I would rather call it a distributed data management infrastructure. It is completely distributed and supports advanced features that give you a lot of control over how the data is distributed, by means of a rich set of Quality of Service settings.
Not knowing much about your problem, I could guess what an approach might be. DDS is about distributing the state of strongly-typed data-items, as structures with typed attributes. You could create a data-type describing the state of an automaton. One of its attributes could be an ID uniquely identifying the automaton in the system. If possible, that would be assigned according to a scheme such that every automaton knows what the ID's of its neighbors are (if they are present). Each automaton would publish its state as needed, resulting in a distributed data-space containing the current state of all automatons. DDS supports so-called partitioning of that data-space. If you took advantage of that, then each of the nodes in your machine would be responsible for a well-defined subset of all automatons. Communication over the wire would only happen for those automatons neighboring a different partition. Since automatons know the ID's of their neighbors, they would be able to query the data-space for the states of the automatons it's interested in.

Are single producer/consumer Tornado queues thread-safe?


Tag : python , By : vferman
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , No, Tornado queues are not thread safe by any definition of the term. Consider scheduling the "put_nowait" call on the main thread from your "Thread 2":
IOLoop.current().add_callback(queue.put_nowait, msg)

Unblock tornado.queues.Queue.get() coroutine when on_connection_close()?


Tag : python , By : Funkwarrior
Date : March 29 2020, 07:55 AM
this will help Use chain_future. Chain queue.get's future with some other future that is in your control (some kind of indicator/flag), then simply resolve flag future on close:
from tornado.concurrent import Future, chain_future

class MyHandler(tornado.web.RequestHandler):

    def initialize(self):
        # of course you can create that in get as well
        self.close_indicator = Future()

    @tornado.gen.coroutine
    def get(self):
        queue = self.getQueue() # returns a tornado.queues.Queue
        qget_future = queue.get()
        chain_future(self.close_indicator, qget_future) 
        _ = yield qget_future
        self.write("whatever")

    def on_connection_close(self):
        super().on_connection_close()
        # set close indicator by resolving future
        # result will be copied to chained future (qget_future)
        self.close_indicator.set_result(None)

Creation of Multiple Message Queues, with Unique Keys for the queues


Tag : c , By : Martin
Date : March 29 2020, 07:55 AM
it should still fix some issue We create multiple queues for message passing from one process to other. But sometimes the keys of the message queues get overlapped ( same keys for separate queues). In order to avoid this I thought of using IPC_PRIVATE with the function msgget() which is used in the creation of Message queues. ,
Please tell me the syntax for msgget with IPC_PRIVATE
int flags = /* ... permission bits ... */;
int my_mq = msgget(IPC_PRIVATE, flags);

WebSphere MQ/MQSeries - Possible to send a message to multiple queues with single call?


Tag : oracle , By : Lex Viatkine
Date : March 29 2020, 07:55 AM
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