pyrolite: newbie quicker-start for Java

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Hi,


Thanks, Irmen for Pyro and Pyrolite!  It saves my day.

I'm posting what I hope is useful for other newbies like me, which is an =

elaboration of the Pyro simple example greeting.py appearing in=20
http://pythonhosted.org//Pyro4/intro.html#with-a-name-server but with a=20
Java (rather than Python) client.

That is, tying together the above with an elaboration of the "small code =

example in Java" that appears in:=20
https://pythonhosted.org/Pyro4/pyrolite.html

FYI, I am running under Window 7 64-bit, WinPython-64bit-3.4.2.4 and=20
Java1.6 (forced by my using ImageJ).

Install Pyro4 onto Python side:
https://pythonhosted.org/Pyro4/install.html

Install pyrolite on Java side (stick the .jar files wherever they need=20
to be):
https://pythonhosted.org/Pyro4/pyrolite.html

Under Python, start a Pyro NameServer: python -m Pyro4.naming
refs:
      http://pythonhosted.org//Pyro4/intro.html#with-a-name-server
http://pythonhosted.org//Pyro4/nameserver.html#nameserver-nameserver

Under Python, following=20
http://pythonhosted.org//Pyro4/intro.html#with-a-name-server ,
type in the contents of greeting.py to Python interpreter (omitting the=20
print statement) or execute greeting.py.  What this does is to set up a=20
"server" class (i.e. something you want to serve up Python library=20
methods to Java client) and instantiate it, start the Pyro daemon,=20
register the server class instance to the daemon and also to the=20
(auto-found) Pyro name server (already running due to previous step above=
).

Under Java, essentially follow the "small code example in Java" that=20
appears in
  https://pythonhosted.org/Pyro4/pyrolite.html   but minding some=20
clarification comments and possibly needed adaptations, as I show=20
below.  This Java example is actually an ImageJ plugin implementation,=20
but those particulars are unimportant.  What this code does is to=20
locate|grab the NameServerProxy, construct the (java proxy|instance of=20
the) Pyro-served Python server class instance (here, the class=20
GreetingMaker), invoke its method (get_fortune), and cast the return=20
value to the appropriate Java type (see Python-Java mappings in pyrolite =

readme.txt).

//  Stuff for ImageJ -- of no interest to non-ImageJ folks!
import ij.*;
import ij.process.*;
import ij.gui.*;
import java.awt.*;
import ij.plugin.*;
import ij.plugin.frame.*;

// Needed for pyrolite
import net.razorvine.pyro.*;
import java.io.*;   // Needed (?) for IOException thrown by some=20
pyrolite methods


public class Greeting_Client implements PlugIn {

//    public void run(String arg) throws IOException {
//         The above "throws" augmentation would allow various=20
exception-throwing pyrolite methods to
//          compile, but ImageJ's plugin interface can't be overriden=20
this way.
//          So instead, required to use try-catch blocks below!
     public void run(String arg)  {

       IJ.showMessage("Here we go...");

       // NameServerProxy ns =3D NameServerProxy.locateNS(null);
       //  We have to break up the declaration and construction of the=20
ns variable as follows, or
       //    declaring and constructing it in one line (as above) within =

the try block means ns
       //     is local (only) within that try block.
       //   We follow this idiom with further instances later below.
       NameServerProxy ns =3D null;  // needs to be initialized to null o=
r=20
get
                                                         // "variable=20
might not have been initialized" compilation error
        try {
            ns =3D NameServerProxy.locateNS(null);
         } catch (IOException e) {
               IJ.showMessage("Caught LocateNS IOException: " +=20
e.getMessage());
              return;
         }


        // PyroProxy remoteobject =3D new=20
PyroProxy(ns.lookup("PYRONAME:example.greeting"));
        //   The Pyro dox for the Python side uses above argument form,=20
but the Java-side Pyrolite uses
        //      below form without the PYRONAME: prefix.
        //PyroProxy remoteobject =3D new=20
PyroProxy(ns.lookup("example.greeting"));
        PyroProxy remoteobject =3D null;
        try {
            remoteobject =3D new PyroProxy(ns.lookup("example.greeting"))=
;
         } catch (IOException e) {
                IJ.showMessage("Caught ns.lookup IOException: " +=20
e.getMessage());
               return;  // occurs AFTER the following finally block
         } finally {
             ns.close();
          }

        // Object result =3D remoteobject.call("get_fortune", "Lucifer");=

       Object result =3D null;
        try {
            result =3D remoteobject.call("get_fortune", "Lucifer");
         } catch (IOException e) {
               IJ.showMessage("Caught remoteobject.call IOException: " + =

e.getMessage());
              return;
         } finally {
               ns.close();
               remoteobject.close();
          }


        String message =3D (String)result;  // cast to the type that=20
'get_fortune' returns
         IJ.showMessage(message);
        boolean okQ =3D IJ.showMessageWithCancel("My_Plugin", "Pyrolite=20
Example");  // waits...till user action
        remoteobject.close();
        ns.close();
     }

}





--=20

Frank J. Iannarilli   franki-u9QQAxJRRC9Wk0Htik3J/[email protected]
Aerodyne Research, Inc., 45 Manning Road, Billerica, MA 01821 USA



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