Re: Work between multiple processes

[Patrick Zhou]

Hi Irmen,

I have successfully got it to work with both side as python but so far having 
trouble with pyrolite.jar which is downloaded from 
https://mvnrepository.com/artifact/net.razorvine/pyrolite/4.4


Having simple codes as:

public static void main(String[] args) {
//System.out.println("Hello world");

try {
String uri = 
"PYRO:obj_12a65b09f95f4ee9bec5958f819ced45@localhost:64404";
PyroURI pyURI = new PyroURI(uri);
PyroProxy pyroP = new PyroProxy(pyURI);

Object result = pyroP.call("getDst");
String message = (String) result;
System.out.println("result message=" + message);
pyroP.close();
}
catch (IOException e1) {
System.out.println(e1.getMessage());
}
catch (PickleException e2)
{
System.out.println(e2.getMessage());
}
catch (PyroException e3)
{
System.out.println(e3.getMessage());
}
}

which "getDst" works on Java but hangs on handshake() in the call function. 

Any thought? Thanks. -P
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Re: Work between multiple processes

[Patrick Zhou]

On Thursday, January 5, 2017 at 5:49:46 PM UTC-5, Irmen de Jong wrote:
> On 4-1-2017 23:14, zxpat...@gmail.com wrote:
> > Hi everyone,
> > 
> > I ran into a case that I need to create a work process of an application 
> > (Jython so has to call using java.exe) which will collect the data based on 
> > what main process indicates. 
> > 
> > (1) I tried multiprocessing package, no luck. Java.exe can't be called from 
> > Process class?
> > 
> > (2) I tried subprocess. subprocess.communicate function will wait for the 
> > work process to terminate so to return.
> > 
> >  
> > either (1) or (2) doesn't work out well. Please suggest.  Global system 
> > queue?
> > 
> > Thanks,
> > Patrick.
> > 
> 
> 
> Is it a requirement that the workdf process is also Jython?
> 
> If not: you could spawn a Python subprocess that hosts a Pyro4 daemon.
> Utilizing the Pyrolite java client library you can call methods in it from the
> java/jython side.  (Unfortunately it is not yet possible (due to jython
> incompatibilities) to use the full Pyro4 library on the Jython side as well).
> Not sure if it meets your set of requirements but have a look at
> http://pythonhosted.org/Pyro4/
> http://pythonhosted.org/Pyro4/pyrolite.html
> 
> 
> Irmen


Thanks Irmen. I think that could be the solution I am looking for. The main 
process will be native python so it can be used to host a pyro daemon even with 
lock. The jython will be a subprocess that takes the daemon's uri and use the 
pyrolite library to make the communication. The only trouble is that I will 
have to involve two more java libraries but I don't think it is a big of deal. 
Will try it and post the source code if possible.
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