Hi,
I found that Pyjs supported only async remote call (ex:
HTTPRequest.AsyncPost(), but not HTTPRequest.Post()). It makes source code
complicated when a series of remote calls are using preceding results.
Many applications use a function call returning a value, but an async call
forces to separate the function and the return value making code
complicated. This is an example using xmlrpclib in Python:
import xmlrpclib
s = xmlrpclib.ServerProxy('http://localhost:8000')
v1=s.pow(2,3) # pow() is a remote function
v2=s.add(v1,3) # add() is a remote function
v3=s.div(v2,2) # div() is a remote function
Corresponding code for Pyjs is a lot more complicated (sudo code):
s = JSONProxy('http://localhost:8000')
class ServiceHandler:
def onRemoteResponse(self, response, sender):
if sender=='pow':
self.return_of_pow=response
s.add(self.return_of_pow, 3, self)
if sender=='add':
self.return_of_add=response
s.div(self.return_of_add, 2, self)
if sender=='div':
self.return_of_div=response
handler=ServiceHandler()
s.pow(2,3, handler)
The return values from the server are not directly passed, but
asynchronously passed to the event handler. It is nature of asynchronous
programming making code complicated. It is possible to make code simpler
using 'yield' command and generators, and this is how I am writing code in
Pyjs now. But this asynchronous programming style has a problem making
debugging more difficult because stack contents cannot be shown properly.
So, I want to use synchronous calls like xmlrpclib of Python. It can cause
GUI interface to get stuck sometimes, but it is ok in most of applications.
In order to implement it in Pyjs, inserting a code waiting server response
is enough, but the control should go to the Pyjs main loop because Pyjs
cannot updates server response while user code is running. So, I needed a
function to force Pyjs to update server response.
HTTPRequest.asyncPost('http://localhost:8000', handler)
while handler.did_server_responded!=True: #waiting server
response
force_Pyjs_to_update_events()
Is there such a function in Pyjs? If not, I'd like to try to make one.
Please let me know if you have an idea.
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