Jython

Ok, so my further experiments in how to make Jython work on GAE/J have led
me to attempting the Google Web Toolkit example, and see if I can drive the
server code using Jython, and I have success. So, with GWT, I can build a UI
in Java (that compiles into JavaScript), and then I can write the
server-side components in Jython (thanks to Josh's little Object Factory
trick he helped me with earlier), so I can build the server-end with Jython
(the only limitation is dealing with the DataStore, using JDO, I still need
to build a couple Java classes to handle that gracefully, but even that
works like a charm).

JDO:

   - I don't know how to use this directly in Jython, so like I said
   earlier, I simply make a Java class with the JDO annotations, and use that
   class in Jython. Not really all that difficult.
   - There is a gotcha: The PersistenceManagerFactory, when you do the
   following in Jython:

from import javax.jdo import JDOHelper

PMF = JDOHelper.getPersistenceManagerFactory("transactions-optional")

pm = PMF.getPersistenceManager()

try:
    pm.makePersistent(Stock(user, symbol)) # Any class properly annotated
for JDO here
finally:
    pm.close()
This *will* fail. The reason is because the getPersistenceManager() method
doesn't return a PersistenceManager object, but something else from the
DataNucleus system. Building a PMF class (as outlined in the GAE/J example
for "guestbook"), and adding a method to return a PersistenceManager object
directly in Java like:
package com.google.gwt.sample.stockwatcher.server;

import javax.jdo.JDOHelper;
import javax.jdo.PersistenceManager;
import javax.jdo.PersistenceManagerFactory;

public final class PMF {
    private static final PersistenceManagerFactory pmfInstance =
        JDOHelper.getPersistenceManagerFactory("transactions-optional");

    private PMF() {}

    public static PersistenceManager getPM() {
        return (PersistenceManager) pmfInstance.getPersistenceManager();
    }
}
And then loading that into the above Python code changes it to:
from import javax.jdo import JDOHelper
from com.google.gwt.sample.stockwatcher.server import PMF

pm = PMF.getPM()

try:
    pm.makePersistent(Stock(user, symbol)) # Any class properly annotated
for JDO here
finally:
    pm.close()
This will work correctly then.

GWT:

   - Unfortunately, writing Jython and having it compile into JavaScript for
   the client side doesn't work. It would be incredible if it did, but that's
   neither here nor there right now... Where Jython comes in handy is driving
   the server side of things. GWT makes it incredibly convenient to have AJAX
   calls be handled directly inside the Jython code, without needing to
   actually *write* AJAX code. Another nice detail is that GWT conveniently
   sets up an interface for the servlet to implement... which makes building
   the Object Factory code that Josh shows in the Jython book able to
   immediately use the Jython servlet without the need of implementing another
   interface (simply have it use the one GWT requires)
   - Here is an example of a servlet changes the stock prices in the
   StockWatcher example for GWT:

from com.google.gwt.user.server.rpc import RemoteServiceServlet

from com.google.gwt.sample.stockwatcher.client import StockPrice,
StockPriceService, DelistedException

import sys

sys.path.insert(0, 'WEB-INF/python-lib/Lib.zip')

import random

MAX_PRICE = 100.0       # $100.00
MAX_PRICE_CHANGE = 0.02 # +/- 2%

class StockPriceServiceImpl(RemoteServiceServlet, StockPriceService):

    def getPrices(self, symbols):
        prices = []
        for i in range(len(symbols)):
            if symbols[i] == "ERR":
                raise DelistedException("ERR")

            price = random.random() * MAX_PRICE
            change = price * MAX_PRICE_CHANGE * (random.random() * 2.0 -
1.0)

            prices.append(StockPrice(symbols[i], price, change))

        return prices

   - Oh, and the Object Factory code in Java:

package com.google.gwt.sample.stockwatcher.server;

import com.google.gwt.user.server.rpc.RemoteServiceServlet;

import org.plyjy.factory.JythonObjectFactory;

import com.google.gwt.sample.stockwatcher.client.DelistedException;
import com.google.gwt.sample.stockwatcher.client.StockPrice;
import com.google.gwt.sample.stockwatcher.client.StockPriceService;

public class StockPriceServiceFacade extends RemoteServiceServlet implements
StockPriceService {

    private JythonObjectFactory factory = null;

    String pyServletName = null;

    @Override
    public StockPrice[] getPrices(String[] symbols) throws DelistedException
{
        factory = factory.getInstance();
        pyServletName = getInitParameter("PyServletName");
        StockPriceService jythonServlet = (StockPriceService)
factory.createObject(StockPriceService.class, pyServletName);
        return jythonServlet.getPrices(symbols);
    }

}

So, now that I have done this... my next step is to try and build something
from scratch with all of this. I'm really enjoying the ability to use Jython
on the Google Apps Engine...

-- 
"I'm not responcabel fer my computer's spleling errnors" - Xlorep DarkHelm
Website: http://darkhelm.org
Sent from Santa Maria, California, United States

Re: [Jython-users] Google Apps Engine/Java, Google Web Toolkit, & Jython (oh my!) From: Josh Juneau <juneau001@gm...> - 2009-08-11 14:19 Attachments: Message as HTML      Nice work Cliff! This is very interesting stuff...always great to see Jython used in different ways. I wonder if we should start a wiki page dedicated to posting solutions such as this? Thoughts? Josh Juneau juneau001@... http://jj-blogger.blogspot.com Twitter ID: javajuneau On Mon, Aug 10, 2009 at 4:52 PM, Cliff Hill <xlorep@...> wrote: > Ok, so my further experiments in how to make Jython work on GAE/J have led > me to attempting the Google Web Toolkit example, and see if I can drive the > server code using Jython, and I have success. So, with GWT, I can build a UI > in Java (that compiles into JavaScript), and then I can write the > server-side components in Jython (thanks to Josh's little Object Factory > trick he helped me with earlier), so I can build the server-end with Jython > (the only limitation is dealing with the DataStore, using JDO, I still need > to build a couple Java classes to handle that gracefully, but even that > works like a charm). > > JDO: > > - I don't know how to use this directly in Jython, so like I said > earlier, I simply make a Java class with the JDO annotations, and use that > class in Jython. Not really all that difficult. > - There is a gotcha: The PersistenceManagerFactory, when you do the > following in Jython: > > from import javax.jdo import JDOHelper > > PMF = JDOHelper.getPersistenceManagerFactory("transactions-optional") > > pm = PMF.getPersistenceManager() > > try: > pm.makePersistent(Stock(user, symbol)) # Any class properly annotated > for JDO here > finally: > pm.close() > This *will* fail. The reason is because the getPersistenceManager() method > doesn't return a PersistenceManager object, but something else from the > DataNucleus system. Building a PMF class (as outlined in the GAE/J example > for "guestbook"), and adding a method to return a PersistenceManager object > directly in Java like: > package com.google.gwt.sample.stockwatcher.server; > > import javax.jdo.JDOHelper; > import javax.jdo.PersistenceManager; > import javax.jdo.PersistenceManagerFactory; > > public final class PMF { > private static final PersistenceManagerFactory pmfInstance = > JDOHelper.getPersistenceManagerFactory("transactions-optional"); > > private PMF() {} > > public static PersistenceManager getPM() { > return (PersistenceManager) pmfInstance.getPersistenceManager(); > } > } > And then loading that into the above Python code changes it to: > from import javax.jdo import JDOHelper > from com.google.gwt.sample.stockwatcher.server import PMF > > pm = PMF.getPM() > > try: > pm.makePersistent(Stock(user, symbol)) # Any class properly annotated > for JDO here > finally: > pm.close() > This will work correctly then. > > GWT: > > - Unfortunately, writing Jython and having it compile into JavaScript > for the client side doesn't work. It would be incredible if it did, but > that's neither here nor there right now... Where Jython comes in handy is > driving the server side of things. GWT makes it incredibly convenient to > have AJAX calls be handled directly inside the Jython code, without needing > to actually *write* AJAX code. Another nice detail is that GWT conveniently > sets up an interface for the servlet to implement... which makes building > the Object Factory code that Josh shows in the Jython book able to > immediately use the Jython servlet without the need of implementing another > interface (simply have it use the one GWT requires) > - Here is an example of a servlet changes the stock prices in the > StockWatcher example for GWT: > > from com.google.gwt.user.server.rpc import RemoteServiceServlet > > from com.google.gwt.sample.stockwatcher.client import StockPrice, > StockPriceService, DelistedException > > import sys > > sys.path.insert(0, 'WEB-INF/python-lib/Lib.zip') > > import random > > MAX_PRICE = 100.0 # $100.00 > MAX_PRICE_CHANGE = 0.02 # +/- 2% > > class StockPriceServiceImpl(RemoteServiceServlet, StockPriceService): > > def getPrices(self, symbols): > prices = [] > for i in range(len(symbols)): > if symbols[i] == "ERR": > raise DelistedException("ERR") > > price = random.random() * MAX_PRICE > change = price * MAX_PRICE_CHANGE * (random.random() * 2.0 - > 1.0) > > prices.append(StockPrice(symbols[i], price, change)) > > return prices > > - Oh, and the Object Factory code in Java: > > package com.google.gwt.sample.stockwatcher.server; > > import com.google.gwt.user.server.rpc.RemoteServiceServlet; > > import org.plyjy.factory.JythonObjectFactory; > > import com.google.gwt.sample.stockwatcher.client.DelistedException; > import com.google.gwt.sample.stockwatcher.client.StockPrice; > import com.google.gwt.sample.stockwatcher.client.StockPriceService; > > public class StockPriceServiceFacade extends RemoteServiceServlet > implements StockPriceService { > > private JythonObjectFactory factory = null; > > String pyServletName = null; > > @Override > public StockPrice[] getPrices(String[] symbols) throws > DelistedException { > factory = factory.getInstance(); > pyServletName = getInitParameter("PyServletName"); > StockPriceService jythonServlet = (StockPriceService) > factory.createObject(StockPriceService.class, pyServletName); > return jythonServlet.getPrices(symbols); > } > > } > > So, now that I have done this... my next step is to try and build something > from scratch with all of this. I'm really enjoying the ability to use Jython > on the Google Apps Engine... > > -- > "I'm not responcabel fer my computer's spleling errnors" - Xlorep DarkHelm > Website: http://darkhelm.org > Sent from Santa Maria, California, United States > > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day > trial. Simplify your report design, integration and deployment - and focus > on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > _______________________________________________ > Jython-users mailing list > Jython-users@... > https://lists.sourceforge.net/lists/listinfo/jython-users > >

Re: [Jython-users] Google Apps Engine/Java, Google Web Toolkit, & Jython (oh my!) From: Cliff Hill <xlorep@da...> - 2009-08-11 16:40 Attachments: Message as HTML      Might be a fun idea. There are so many weird gotchas in the Google Apps Engine/Java system (and the Google Web Toolkit), it might be good to have a place documenting them and the workarounds... something I forgot to mention was the site I have where the Jython edition of the GWT demo app is: http://primary-test.appspot.com This is the demo found here: http://code.google.com/webtoolkit/tutorials/1.6/gettingstarted.html Followed by the internationalization steps here: http://code.google.com/webtoolkit/tutorials/1.6/i18n.html and then the client-server GWT-RPC part here: http://code.google.com/webtoolkit/tutorials/1.6/RPC.html and finally the Google Apps Engine part here: http://code.google.com/webtoolkit/tutorials/1.6/appengine.html Then a rewrite of the server components into Jython, using what Josh has written up in the Jython book: http://jythonpodcast.hostjava.net/jythonbook/chapter18.html#google-app-engine Just part of me figuring out how to levy using Jython with GWT in the GAE/J environment. As I said before, my next step is to make something from scratch, which I'm currently in the middle of. Something I want to try is to have some Jython functions stored in the datastore, which then I can dynamically load into the server components and have them run the functions... which would be something a bit more dynamic than Java usually is capable of. I'm also looking at using some jython generators to drive a series of AJAX functions to process and update a UI element... really try and do some fun things with this all. On Tue, Aug 11, 2009 at 7:18 AM, Josh Juneau <juneau001@...> wrote: > Nice work Cliff! This is very interesting stuff...always great to see > Jython used in different ways. > > I wonder if we should start a wiki page dedicated to posting solutions such > as this? Thoughts? > > > Josh Juneau > juneau001@... > http://jj-blogger.blogspot.com > Twitter ID: javajuneau > > > On Mon, Aug 10, 2009 at 4:52 PM, Cliff Hill <xlorep@...> wrote: > >> Ok, so my further experiments in how to make Jython work on GAE/J have led >> me to attempting the Google Web Toolkit example, and see if I can drive the >> server code using Jython, and I have success. So, with GWT, I can build a UI >> in Java (that compiles into JavaScript), and then I can write the >> server-side components in Jython (thanks to Josh's little Object Factory >> trick he helped me with earlier), so I can build the server-end with Jython >> (the only limitation is dealing with the DataStore, using JDO, I still need >> to build a couple Java classes to handle that gracefully, but even that >> works like a charm). >> >> JDO: >> >> - I don't know how to use this directly in Jython, so like I said >> earlier, I simply make a Java class with the JDO annotations, and use that >> class in Jython. Not really all that difficult. >> - There is a gotcha: The PersistenceManagerFactory, when you do the >> following in Jython: >> >> from import javax.jdo import JDOHelper >> >> PMF = JDOHelper.getPersistenceManagerFactory("transactions-optional") >> >> pm = PMF.getPersistenceManager() >> >> try: >> pm.makePersistent(Stock(user, symbol)) # Any class properly annotated >> for JDO here >> finally: >> pm.close() >> This *will* fail. The reason is because the getPersistenceManager() method >> doesn't return a PersistenceManager object, but something else from the >> DataNucleus system. Building a PMF class (as outlined in the GAE/J example >> for "guestbook"), and adding a method to return a PersistenceManager object >> directly in Java like: >> package com.google.gwt.sample.stockwatcher.server; >> >> import javax.jdo.JDOHelper; >> import javax.jdo.PersistenceManager; >> import javax.jdo.PersistenceManagerFactory; >> >> public final class PMF { >> private static final PersistenceManagerFactory pmfInstance = >> JDOHelper.getPersistenceManagerFactory("transactions-optional"); >> >> private PMF() {} >> >> public static PersistenceManager getPM() { >> return (PersistenceManager) pmfInstance.getPersistenceManager(); >> } >> } >> And then loading that into the above Python code changes it to: >> from import javax.jdo import JDOHelper >> from com.google.gwt.sample.stockwatcher.server import PMF >> >> pm = PMF.getPM() >> >> try: >> pm.makePersistent(Stock(user, symbol)) # Any class properly annotated >> for JDO here >> finally: >> pm.close() >> This will work correctly then. >> >> GWT: >> >> - Unfortunately, writing Jython and having it compile into JavaScript >> for the client side doesn't work. It would be incredible if it did, but >> that's neither here nor there right now... Where Jython comes in handy is >> driving the server side of things. GWT makes it incredibly convenient to >> have AJAX calls be handled directly inside the Jython code, without needing >> to actually *write* AJAX code. Another nice detail is that GWT conveniently >> sets up an interface for the servlet to implement... which makes building >> the Object Factory code that Josh shows in the Jython book able to >> immediately use the Jython servlet without the need of implementing another >> interface (simply have it use the one GWT requires) >> - Here is an example of a servlet changes the stock prices in the >> StockWatcher example for GWT: >> >> from com.google.gwt.user.server.rpc import RemoteServiceServlet >> >> from com.google.gwt.sample.stockwatcher.client import StockPrice, >> StockPriceService, DelistedException >> >> import sys >> >> sys.path.insert(0, 'WEB-INF/python-lib/Lib.zip') >> >> import random >> >> MAX_PRICE = 100.0 # $100.00 >> MAX_PRICE_CHANGE = 0.02 # +/- 2% >> >> class StockPriceServiceImpl(RemoteServiceServlet, StockPriceService): >> >> def getPrices(self, symbols): >> prices = [] >> for i in range(len(symbols)): >> if symbols[i] == "ERR": >> raise DelistedException("ERR") >> >> price = random.random() * MAX_PRICE >> change = price * MAX_PRICE_CHANGE * (random.random() * 2.0 - >> 1.0) >> >> prices.append(StockPrice(symbols[i], price, change)) >> >> return prices >> >> - Oh, and the Object Factory code in Java: >> >> package com.google.gwt.sample.stockwatcher.server; >> >> import com.google.gwt.user.server.rpc.RemoteServiceServlet; >> >> import org.plyjy.factory.JythonObjectFactory; >> >> import com.google.gwt.sample.stockwatcher.client.DelistedException; >> import com.google.gwt.sample.stockwatcher.client.StockPrice; >> import com.google.gwt.sample.stockwatcher.client.StockPriceService; >> >> public class StockPriceServiceFacade extends RemoteServiceServlet >> implements StockPriceService { >> >> private JythonObjectFactory factory = null; >> >> String pyServletName = null; >> >> @Override >> public StockPrice[] getPrices(String[] symbols) throws >> DelistedException { >> factory = factory.getInstance(); >> pyServletName = getInitParameter("PyServletName"); >> StockPriceService jythonServlet = (StockPriceService) >> factory.createObject(StockPriceService.class, pyServletName); >> return jythonServlet.getPrices(symbols); >> } >> >> } >> >> So, now that I have done this... my next step is to try and build >> something from scratch with all of this. I'm really enjoying the ability to >> use Jython on the Google Apps Engine... >> >> -- >> "I'm not responcabel fer my computer's spleling errnors" - Xlorep DarkHelm >> Website: http://darkhelm.org >> Sent from Santa Maria, California, United States >> >> >> ------------------------------------------------------------------------------ >> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 >> 30-Day >> trial. Simplify your report design, integration and deployment - and focus >> on >> what you do best, core application coding. Discover what's new with >> Crystal Reports now. http://p.sf.net/sfu/bobj-july >> _______________________________________________ >> Jython-users mailing list >> Jython-users@... >> https://lists.sourceforge.net/lists/listinfo/jython-users >> >> > -- "I'm not responcabel fer my computer's spleling errnors" - Xlorep DarkHelm Website: http://darkhelm.org

Re: [Jython-users] Google Apps Engine/Java, Google Web Toolkit, & Jython (oh my!) From: Charlie Groves <charlie.groves@gm...> - 2009-08-11 20:27 On Mon, Aug 10, 2009 at 2:52 PM, Cliff Hill<xlorep@...> wrote: > There is a gotcha: The PersistenceManagerFactory, when you do the following > in Jython: > > from import javax.jdo import JDOHelper > > PMF = JDOHelper.getPersistenceManagerFactory("transactions-optional") > > pm = PMF.getPersistenceManager() > > try: >     pm.makePersistent(Stock(user, symbol)) # Any class properly annotated > for JDO here > finally: >     pm.close() > This *will* fail. The reason is because the getPersistenceManager() method > doesn't return a PersistenceManager object, but something else from the > DataNucleus system. I don't get why this would fail in Jython. It shouldn't care about the type returned by getPersistenceManager. Would you mind filing a bug for this with the stack trace that results when this fails? Charlie

Re: [Jython-users] Google Apps Engine/Java, Google Web Toolkit, & Jython (oh my!) From: Cliff Hill <xlorep@da...> - 2009-08-11 20:31 Attachments: Message as HTML      Actually, it matters, because the object that returns when you do PMF.getPersistenceManager() doesn't have the makePersistent() method, apparently. I could file a bug report if you need it... On Tue, Aug 11, 2009 at 1:26 PM, Charlie Groves <charlie.groves@...: > On Mon, Aug 10, 2009 at 2:52 PM, Cliff Hill<xlorep@...> wrote: > > There is a gotcha: The PersistenceManagerFactory, when you do the > following > > in Jython: > > > > from import javax.jdo import JDOHelper > > > > PMF = JDOHelper.getPersistenceManagerFactory("transactions-optional") > > > > pm = PMF.getPersistenceManager() > > > > try: > > pm.makePersistent(Stock(user, symbol)) # Any class properly annotated > > for JDO here > > finally: > > pm.close() > > This *will* fail. The reason is because the getPersistenceManager() > method > > doesn't return a PersistenceManager object, but something else from the > > DataNucleus system. > > I don't get why this would fail in Jython. It shouldn't care about > the type returned by getPersistenceManager. Would you mind filing a > bug for this with the stack trace that results when this fails? > > Charlie > -- "I'm not responcabel fer my computer's spleling errnors" - Xlorep DarkHelm Website: http://darkhelm.org

Re: [Jython-users] Google Apps Engine/Java, Google Web Toolkit, & Jython (oh my!) From: Charlie Groves <charlie.groves@gm...> - 2009-08-11 22:47 On Tue, Aug 11, 2009 at 1:31 PM, Cliff Hill<xlorep@...> wrote: > Actually, it matters, because the object that returns when you do > PMF.getPersistenceManager() doesn't have the makePersistent() method, > apparently. But the one returned from Java does have makePersistent? I feel like the Java and Jython code are equivalent, so I'd like to track down the difference as that might be a Jython bug. Is there anything the Java code is doing that isn't in the example? Charlie

Re: [Jython-users] Google Apps Engine/Java, Google Web Toolkit, & Jython (oh my!) From: Cliff Hill <xlorep@da...> - 2009-08-11 23:25 Attachments: Message as HTML      Now, maybe there is something wrong in Jython's reflection functionality, so maybe there is a need for a bug report... But I was more or less assuming it was something weird with the GAE/J DataNucleus hooks. On Tue, Aug 11, 2009 at 4:15 PM, Cliff Hill <xlorep@...> wrote: > Yes, the Java code is casting it as a different class that does have > makePersistent(), while the Jython code doesn't do that (without coersion > through the trick I showed earlier). > > I think this is a bit strange myself, but one way works, the other doesn't. > And the only thing I could find was that the DataNucleus object which is > returned doesn't actually have makePersistent... which doesn't make much > sense if it is derived from the class that does, but oh well... but a > PersistenceManager object does have the needed method. The Java code assigns > the results to a PersistenceManager object and therefore it gets recast as > one, while the Jython code doesn't do this, and it leaves it as the > DataNucleus object which is missing that method. As such, my solution is to > have the java code coerce it to the correct class, and then hand it off to > Jython as the correct one (that is, the class with makePersistent). > > > On Tue, Aug 11, 2009 at 3:46 PM, Charlie Groves <charlie.groves@...: > >> On Tue, Aug 11, 2009 at 1:31 PM, Cliff Hill<xlorep@...> wrote: >> > Actually, it matters, because the object that returns when you do >> > PMF.getPersistenceManager() doesn't have the makePersistent() method, >> > apparently. >> >> But the one returned from Java does have makePersistent? I feel like >> the Java and Jython code are equivalent, so I'd like to track down the >> difference as that might be a Jython bug. Is there anything the Java >> code is doing that isn't in the example? >> >> Charlie >> > > > > -- > "I'm not responcabel fer my computer's spleling errnors" - Xlorep DarkHelm > Website: http://darkhelm.org > Sent from Santa Maria, California, United States > -- "I'm not responcabel fer my computer's spleling errnors" - Xlorep DarkHelm Website: http://darkhelm.org Sent from Santa Maria, California, United States

Re: [Jython-users] Google Apps Engine/Java, Google Web Toolkit, & Jython (oh my!) From: <recursive68@gm...> - 2009-08-12 19:42 Attachments: Message as HTML      I've been using this too with a combination of Java/Jython, Java for the JDO/data POJOs, Jython the rest. Jython doesn't appear to support Java decorators which JDO uses extensively in the examples and seems to be stumbling block for a pure Jython GAE solution or am I missing something ? Jynx looks like a possible solution with respect to Java decorators ? 2009/8/12 Cliff Hill <xlorep@...> > Now, maybe there is something wrong in Jython's reflection functionality, > so maybe there is a need for a bug report... But I was more or less assuming > it was something weird with the GAE/J DataNucleus hooks. > > On Tue, Aug 11, 2009 at 4:15 PM, Cliff Hill <xlorep@...> wrote: > >> Yes, the Java code is casting it as a different class that does have >> makePersistent(), while the Jython code doesn't do that (without coersion >> through the trick I showed earlier). >> >> I think this is a bit strange myself, but one way works, the other >> doesn't. And the only thing I could find was that the DataNucleus object >> which is returned doesn't actually have makePersistent... which doesn't make >> much sense if it is derived from the class that does, but oh well... but a >> PersistenceManager object does have the needed method. The Java code assigns >> the results to a PersistenceManager object and therefore it gets recast as >> one, while the Jython code doesn't do this, and it leaves it as the >> DataNucleus object which is missing that method. As such, my solution is to >> have the java code coerce it to the correct class, and then hand it off to >> Jython as the correct one (that is, the class with makePersistent). >> >> >> On Tue, Aug 11, 2009 at 3:46 PM, Charlie Groves <charlie.groves@... >> > wrote: >> >>> On Tue, Aug 11, 2009 at 1:31 PM, Cliff Hill<xlorep@...> wrote: >>> > Actually, it matters, because the object that returns when you do >>> > PMF.getPersistenceManager() doesn't have the makePersistent() method, >>> > apparently. >>> >>> But the one returned from Java does have makePersistent? I feel like >>> the Java and Jython code are equivalent, so I'd like to track down the >>> difference as that might be a Jython bug. Is there anything the Java >>> code is doing that isn't in the example? >>> >>> Charlie >>> >> >> >> >> -- >> "I'm not responcabel fer my computer's spleling errnors" - Xlorep DarkHelm >> Website: http://darkhelm.org >> Sent from Santa Maria, California, United States >> > > > > -- > "I'm not responcabel fer my computer's spleling errnors" - Xlorep DarkHelm > Website: http://darkhelm.org > Sent from Santa Maria, California, United States > > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day > trial. Simplify your report design, integration and deployment - and focus > on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > _______________________________________________ > Jython-users mailing list > Jython-users@... > https://lists.sourceforge.net/lists/listinfo/jython-users > >

Re: [Jython-users] Google Apps Engine/Java, Google Web Toolkit, & Jython (oh my!) From: Cliff Hill <xlorep@da...> - 2009-08-18 23:45 Attachments: Message as HTML      Well, continuing on with my efforts, I've gotten the basics set up for an old standard program I'd write to learn a new language... Simple program (and right now, not completely functioning) that merely creates an array of sequential integers (array = range(100)), shuffles the array, and sorts it. All in a graphical representation. Nothing too fancy... but I'm playing around with GAE/J, GWT, and Jython... so this now is written using those three technologies together. The UI is written using GWT, the display is a table with dimensions 100x100. The individual cells are then used as pixels, and I use CSS styles to turn the pixels on or off. The Start button currently simply runs a bubble sort routine. I'll be adding to this later. Upon pressing Start: - a GWT-RPC async call is submitted to the Jython servlet that does the actual processing. - The servlet returns an array of updates for the GWT display to work with. These are objects I made that handle inserting, removing, swapping, or moving an element. - The update objects are created through the use of Jython generators which loads up the Jython list which is returned (and received as an array in GWT). - The actual sorting function is stored in the datastore, as source code, which Jython compiles and uses to sort the array. My thought here is to have a way for people to be able to see the actual sorting code in the UI, I want to minimize the ShowSort specific code and be able to have a text-parser remove it so the end result is a clean, crisp, and reusable code for those who desire it... - The status line updates whenever the actual Update object is processed. The name of the function in Jython which is running when the Update object was created will show in the status line. The result is I have a clear separation of processing (Jython) from user interface (GWT). I even have a separation between data & style by using XHTML 1.1 strict and a CSS stylesheet. Getting all of this to work has been educational, to be sure. I'm rather impressed with how Jython gracefully interacts with Java, even in a web application environment. The demo app is at: http://showsort.appspot.com I still have a number of "to do" bits in the code to finish up, like getting the system working with multiple sorting algorithms, loading them into the datastore, and building an admin interface for managing the sorting algorithms. I might even try and make the CSS be generated dynamically so I can hand-configure the settings of the application to suit my needs, without needing to recompile the system. Oh, some caveats: Currently, this seems to run fastest on Firefox, Safari, and Opera. It runs slower on Chrome, and I pity the person who dares to run this in Internet Explorer (eye-bleedingly slow!). Both Internet Explorer and Opera don't quite create the display's table properly... so I'd recommend skipping those two browsers... IE more than Opera though because it takes *forever* to run there (actually, it takes almost as long to run it in the hosted browser as well, which makes development a little annoying). Chrome is also slower, and not recommended (yes, I've tried Chrome 2 and 3 with the same result -- so much for Chrome being superior in speed to the others...) Your best bet, if you want to see this run, is to use Firefox or Safari. -- "I'm not responcabel fer my computer's spleling errnors" - Xlorep DarkHelm Website: http://darkhelm.org Sent from Santa Maria, California, United States

Re: [Jython-users] Google Apps Engine/Java, Google Web Toolkit, & Jython (oh my!) From: Leo Soto M. <leo.soto@gm...> - 2009-08-23 19:08 On Tue, Aug 18, 2009 at 7:44 PM, Cliff Hill<xlorep@...> wrote: > Well, continuing on with my efforts, I've gotten the basics set up for an > old standard program I'd write to learn a new language... Simple program > (and right now, not completely functioning) that merely creates an array of > sequential integers (array = range(100)), shuffles the array, and sorts it. > All in a graphical representation. [...] Hey, it is a very nice, simple enough example which shows Jython/GWT/GAE-J integration from end-to-end! I wonder if you are interested on posting it to our community wiki at <http://wiki.python.org/jython/DocumentationAndEducation>. I also think that this may be a good example to include on the upcoming Jython book, if you agree (with due credit, of course). Regards, -- Leo Soto M. http://blog.leosoto.com

Re: [Jython-users] Google Apps Engine/Java, Google Web Toolkit, & Jython (oh my!) From: Cliff Hill <xlorep@da...> - 2009-08-24 14:03 Attachments: Message as HTML      Once I have it completed, I might do that. Right now, it isn't working at all because I'm working out the details of logging. On Sun, Aug 23, 2009 at 12:08 PM, Leo Soto M. <leo.soto@...> wrote: > On Tue, Aug 18, 2009 at 7:44 PM, Cliff Hill<xlorep@...> wrote: > > Well, continuing on with my efforts, I've gotten the basics set up for an > > old standard program I'd write to learn a new language... Simple program > > (and right now, not completely functioning) that merely creates an array > of > > sequential integers (array = range(100)), shuffles the array, and sorts > it. > > All in a graphical representation. [...] > > Hey, it is a very nice, simple enough example which shows > Jython/GWT/GAE-J integration from end-to-end! > > I wonder if you are interested on posting it to our community wiki at > <http://wiki.python.org/jython/DocumentationAndEducation>. I also > think that this may be a good example to include on the upcoming > Jython book, if you agree (with due credit, of course). > > Regards, > -- > Leo Soto M. > http://blog.leosoto.com > -- "I'm not responcabel fer my computer's spleling errnors" - Xlorep DarkHelm Website: http://darkhelm.org

1 message has been excluded from this view by a project administrator.