On 29 September 2012 21:21, <exar...@twistedmatrix.com> wrote: > On 07:44 pm, poal...@gmail.com wrote: > > > >Thank you. I've made quite a bit of progress and now have my own > >Portal, > >CredentialsChecker, Realm, Shell, and FilePath object. > > > >One thing I haven't been able to work out is, when I override, lets say > >listdir for example in FilePath, I need to make a webcall to find out > >the > >folder contents, how can I make this call asynchronously? > > > >I'm guessing I need to used deferred in someway, but seeing as listdir > >doesn't return deferred objects I'm not sure how to make it work. > > > >As listdir gets called from the Shell I guess I could change how > >blocking > >calls in my FilePath object get called? > > The place to customize listing the contents of a directory is in the > shell. More specifically, in an implementation of IFTPShell.list. It's > almost certainly the case that you should *not* have a FilePath subclass > with overridden methods. Instead, you should have a `list` > implementation on your shell that returns the desired results. And > since `IFTPShell.list` is allowed to return a Deferred, you no longer > have a problem performing asynchronous operations. > > Jean-Paul > > That is likely a much better idea! Will I need to use some threading if I'm making web calls then from list? Presumably if I don't the whole process will block while it's waiting for web responses?
I've seen there is a deferToThread but I'm not too sure how to use it, do I just need to return it?
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