Re: Deserializing specific objects from a file
That's exactly what I needed. Thank you. Aaron J. M. -- http://mail.python.org/mailman/listinfo/python-list
Deserializing specific objects from a file
I'm building a game and am starting to seriously think about serialization, though I haven't done much serialization before except for a few experiments with the pickle module. There are many objects that I want be able to move in and out of memory at runtime; namely the game levels. I only want one level in memory at a time, so I want to be able to unpickle specific Level objects as the player moves between levels. I would prefer my serialized objects to reside in one file. I haven't come across references that say how to do something like what I'm describing. Does anyone here know what techniques I have to employ here? Thank you, Aaron J. M. P.S. Is it *deserialize* or *unserialize*? -- http://mail.python.org/mailman/listinfo/python-list
Re: Pausing and Unpausing Threads
On Aug 13, 2:31 am, "Gabriel Genellina" <[EMAIL PROTECTED]> wrote: > Use the same Queue; put a special kind of Action, or just a None object, > to tell the thread that there are no more things to process. > From the main thread, you can join() the others, waiting for them to > finish. Ah, thank you very much. :) - Aaron J. M. -- http://mail.python.org/mailman/listinfo/python-list
Re: Pausing and Unpausing Threads
Uhg, I thought of something I didn't consider before: how to cleanly end the Server/DirectedControl(l)er process. Assuming that the Client only sends Actions to the DirectedController while the DirectedController is in its turn() method (which I would probably regulate using some flag in DirectedController) the Client will eventually need a way to order the Server to stop its processing. Stopping the Server also has to make the DirectedController break out of its turn method without letting it execute an Action. I don't want to just kill the Server thread because I may want to do serialization or other kinds of cleanup. Have people encountered something like this before? Thank you, Aaron J. M. -- http://mail.python.org/mailman/listinfo/python-list
Re: Pausing and Unpausing Threads
On Aug 12, 3:55 pm, Dennis Lee Bieber <[EMAIL PROTECTED]> wrote: > By this definition, if there is no "action" supplied, a > "DirectedControler" will result in blocking ALL others (directed or not) > in this "server" (as it blocks the entire server thread). > > Is that really the behavior you want? For my particular application, yes. This is exactly what I want. > I'd suggest using a Queue PER directed controller. Initialize > > self._actions = Queue.Queue() > > -=-=-=-=-=- > > def turn(self): > while True: > atn = self._actions.get() #blocks until at > least one entry > if atn and atn.execute(): #should be in a > try/except if > > # action has NO execute method > break #did > something, so exit while > > -=-=-=-=-=- > > def setAction(self, action): > self._actions.put(action) #could add code to ensure > #an > execute attribute Thank you very much for your help. :) I'll get to work on this now. Cheers, Aaron J. M. -- http://mail.python.org/mailman/listinfo/python-list
Pausing and Unpausing Threads
Hello, This is a question about how to pause and unpause threads (as the title suggests). I've created an extension of threading.Thread which I'll call Server. Server has a collection of Controlers. A Controler has a method turn(), which lets it do various interesting things. While the Server is running, it loops through each of its Controlers and calls their turn() method. One of these Controlers is a subclass called DirectedControler. What a DirectedControler is meant to do is wait until it is given an Action object it can invoke. Actions are basically an implementation of the Command pattern. Actions are also invalid in certain circumstances; they return False when executed if they didn't do anything. Therefore, when a DirectedControler is given a turn, it waits while: - It has no Action - The last Action it was given didn't do anything Actions are sent to the DirectedControler by a Client that exists in the main thread. What I'm trying to figure out is how to make the DirectedControler pause while it is waiting for a valid Action. So far I just put it into a loop like this: def turn(self): while self.__action is None or not self.__action.execute(): self.__action = None # Throw away invalid actions pass self.__action = None # Action was valid. Clear the way for the # next turn's Action. Where the Action is set like this (by the Client): def setAction(self, action): if self.__action is None: self.__action = action I'm worried that this loop may wast some CPU cycles, and wonder if there's a better way through thread synchronization using such things as Events or Conditions. Thank you, Aaron J. M. -- http://mail.python.org/mailman/listinfo/python-list
