On Oct 7, 3:20 pm, jimgardener <jimgarde...@gmail.com> wrote:
> hi
> In my django view ,I am creating a Thread subclass and adding it to a
> ThreadManager TM to keep in a dictionary with name of thread as key
> and instance as value.I have implemented TM as a singleton and
> verified that only one instance of TM exists .However,when the view
> calls tm.add_mythread() ,I find that the dictionary inside is empty
> and the currently added instance becomes the only member.
>
> I hope the code will make this clear.Please tell me what I did that
> was wrong.I unit tested the TM using Dummy thread class and found that
> the add works correctly .It is only when the view calls tm.add that
> the above behaviour occurs
>
> The view is like this,
>
> def add_new_threadobj(request,page_title,template_name):
> ....
> if request.method=='POST' and form.is_valid():
> tobj=MyThread(some_post_data..)
> tm=SingletonTM()
> print 'tm=',tm # to check if same instance
> tm.add_mythread(tobj)
> tobj.start()
> ....
>
> TM is a singleton
>
> class TM(MySingleton):
> def __init__(self):
> self.threads={}
> def add_thread(self,th):
> if th.name in self.threads.keys():
> print 'already in'
> else:
> print 'TM::before::threads:',self.threads
> self.threads[th.name]=th
> print 'TM::',self,'add_thread()::added=%s'%th.name
> print 'TM::after::threads:',self.threads
>
> def remove_thread(tname):
> if tname in self.threads.keys():
> del self.threads[tname]
>
> When the view add_new_threadobj() is executed a couple of times,this
> is the print output
> adding for the first time,
> tm= <mytm.TM object at 0x94a83ec>
> TM::before::threads: {}
> TM:: <mytm.TM object at 0x94a83ec> add_thread()::added=threadname1
> TM::after::threads: {'threadname1':<MyThread(threadname1, initial
> daemon)>}
>
> adding another,
> tm= <mytm.TM object at 0x94a83ec>
> TM::before::threads: {}
> TM::after::threads: {'threadname2':<MyThread(threadname2, initial
> daemon)>}
>
> This is what I couldn't make out, the dictionary should now contain 2
> kv pairs.Since the tm instance is the same,the self.threads should
> have printed the initially added thread's name and instance.
> Please tell me if I am missing something
>
> thanks
> jim
What is the MySingleton superclass? There's nothing in the code you've
posted that shows that TM is actually a singleton.
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