Re: [Jython-users] Module reloading

[dperez <cra...@ya...>]

Confirmed that Jython 2.2 doesn't work always, like in 2.1.

Maybe something more than reload(module) is needed.


dperez wrote:
> 
> Thanks for your suggestions.
> 
> I'm using a standard Java servlet, with mixed Java and Python code.
> I have developed a mechanism to force a reload from an URL:
> 
> http://myserver/reload/module does this:
> 
> import module
> reload(module)
> 
> and this doesn't work always :-(
> 
> 
> dimitri van der veken wrote:
>> 
>> 
>> Hi,
>> 
>> I asume you are using PyServlet (or a similar construct).
>> As far as I could see (in jython 2.2a1) PyServlet keeps a cache of
>> underlying 'python servlet' files.
>> As long as you change something in these 'python servlet' files, this
>> should be detected by PyServlet, and the file is automatically refreshed.
>> 
>> This mechanism does NOT detect changes to python code further away from
>> your entry 'python servlet'.
>> Due to the fact that 'PyServlet' itself is not changed , the instance of
>> Pyservlet stays in cache, an nothing changes. 
>> This seemed to prohibit a dynamic development cycle.
>> 
>> I have solved this for me by forcing the reload myself in a
>> 'baseServlet.py'.
>> Here follows a code snippet:
>> 
>> ---------------------------------------------------------------------------------------
>> 
>>  from javax.servlet.http import HttpServlet
>> import gf.Config as config
>> import time
>> import synchronize
>> 
>> 
>> class baseServlet (HttpServlet):
>> 	
>> 	lastRemoveTime = 0
>> 	
>> 	def doGet(self,request,response):
>> 		self.doPost (request,response)
>> 	
>> 	def doPost(self,request,response):
>> 		response.setContentType ("text/html")
>> 		
>> 		# only force reload during development
>> 		if config.developping:
>> 			self._forceReloadModules()
>> 		
>> 		# execute action in descendant
>> 		self.doProcess(request, response)
>> 		
>> 	def _forceReloadModules(self):
>> 		now = time.time()
>> 		if ((now - baseServlet.lastRemoveTime) > 1):
>> 			baseServlet.lastRemoveTime = time.time()
>> 			import sys
>> 			for modname in sys.modules.keys():
>> 				if modname.startswith("gf.") and modname != 'gf.application':
>> 					del(sys.modules[modname])
>> 		else:
>> 			#print " no reloading, seconds since last remove " + str(time.time() -
>> baseServlet.lastRemoveTime)
>> 			pass
>> 
>> baseServlet._forceReloadModules =
>> synchronize.make_synchronized(baseServlet._forceReloadModules)		
>> ------------------------------------------------------------------------------------------
>> 
>> I only reload when developping ( a parameter config.developping)
>> One action in an ajax app can give several request at almost the same
>> time,
>> so I only force the reload if the last reload is more than 1 one second
>> in the past.
>> I only reload my own application modules (modname.startswith("gf.")).
>> 
>> (I also use a modified version of 'Pyservlet' to use this baseServlet,
>> but that
>>  does not change the concept)
>> 
>> This setup works for me.
>> 
>> greetings,
>> Dimitri
>> 
>> 
>> 
> 
> 

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