[Tcl Java] External classloader for JACL
Hello! I'm using JACL in web environment. I wrote engine similar to JSP, which allows to embed Tcl scripts in HTML pages. I want to make use of an advanced classloader, provided by servlet runner which has possibility to check for modification of class or source java files in web-applications, and recompile/reload them on-the-fly. I suppose one essential feature is missing in JACL: an ability to use external class loader in interp. It would be an easy change to add this feature to JACL: Interp.setClassLoader(ClassLoader loader); Interp.getClassLoader(); And TclClassLoader can use this loader (if present in Interp) to load classes. For performance reasons it would be great if this external loader has priority upon standard class loading mechanisms. I beleive that this feature will improve JACL ability to be embeded into different applications and environments. Best regards, Vladimir. The TclJava mailing list is sponsored by Scriptics Corporation. To subscribe:send mail to [EMAIL PROTECTED] with the word SUBSCRIBE as the subject. To unsubscribe: send mail to [EMAIL PROTECTED] with the word UNSUBSCRIBE as the subject. To send to the list, send email to '[EMAIL PROTECTED]'. An archive is available at http://www.mail-archive.com/tcljava@scriptics.com
[Tcl Java] Re: [Tcl Java] External classloader for JACL
Both Jacl and Tcl Blend already use a class loader called TclClassLoader. Is there a feature that you would like to add added to the TclClassLoader or are you looking to bypass it completely? I do not really see anything wrong with adding something to the TclClassLoader or replacing it completely with something better. I really do not like the current design because as a programmer, you need to use the TclClassLoader explicitly, when this type of thing really should be done behind the scenes. I was also planning on stripping out the "feature" of the Tcl Class Loader that automatically looks inside .jar and .zip files that appear on the env(TCL_CLASSPATH). This makes the "worst case" lookup time depend on the number of .zip or .jar files on the file system, which is really ugly. Perhaps we should add a env(TCL_JARPATH) var instead? Mo Dejong Red Hat Inc. On Thu, 2 Mar 2000, Vladimir Zamiatin wrote: Hello! I'm using JACL in web environment. I wrote engine similar to JSP, which allows to embed Tcl scripts in HTML pages. I want to make use of an advanced classloader, provided by servlet runner which has possibility to check for modification of class or source java files in web-applications, and recompile/reload them on-the-fly. I suppose one essential feature is missing in JACL: an ability to use external class loader in interp. It would be an easy change to add this feature to JACL: Interp.setClassLoader(ClassLoader loader); Interp.getClassLoader(); And TclClassLoader can use this loader (if present in Interp) to load classes. For performance reasons it would be great if this external loader has priority upon standard class loading mechanisms. I beleive that this feature will improve JACL ability to be embeded into different applications and environments. Best regards, Vladimir. The TclJava mailing list is sponsored by Scriptics Corporation. To subscribe:send mail to [EMAIL PROTECTED] with the word SUBSCRIBE as the subject. To unsubscribe: send mail to [EMAIL PROTECTED] with the word UNSUBSCRIBE as the subject. To send to the list, send email to '[EMAIL PROTECTED]'. An archive is available at http://www.mail-archive.com/tcljava@scriptics.com
[Tcl Java] RE: [Tcl Java] External classloader for JACL
Title: RE: [Tcl Java] External classloader for JACL
I'd like to see a kind of 'java::unknown' facility, in which if the class loader can't find a class, it calls 'java::unknown {className}', which by default returns null, but can try to find the class itself (from Tcl/Jacl) and if it finds it returns the binary data which represents the class.
I definitely think it would be good to remove the 'feature' you mention below, since it tripped me up very unexpectedly. I don't see a need for adding env(TCL_JARPATH)... The user/the code should add any needed .jar/.zip files direct to the classpath/tcl_classpath.
just my 2c...
Vince.
From: Mo DeJong [mailto:[EMAIL PROTECTED]]
Both Jacl and Tcl Blend already use a class loader called
TclClassLoader.
Is there a feature that you would like to add added to the
TclClassLoader
or are you looking to bypass it completely? I do not really
see anything
wrong with adding something to the TclClassLoader or replacing it
completely with something better. I really do not like the
current design
because as a programmer, you need to use the TclClassLoader
explicitly,
when this type of thing really should be done behind the scenes. I was
also planning on stripping out the feature of the Tcl Class
Loader that
automatically looks inside .jar and .zip files that appear on the
env(TCL_CLASSPATH). This makes the worst case lookup time depend on
the number of .zip or .jar files on the file system, which is really
ugly. Perhaps we should add a env(TCL_JARPATH) var instead?
Mo Dejong
Red Hat Inc.
On Thu, 2 Mar 2000, Vladimir Zamiatin wrote:
Hello!
I'm using JACL in web environment. I wrote engine
similar to JSP, which allows to embed Tcl scripts
in HTML pages. I want to make use of an
advanced classloader, provided by servlet runner
which has possibility to check for modification
of class or source java files in web-applications,
and recompile/reload them on-the-fly.
I suppose one essential feature is missing in JACL:
an ability to use external class loader in interp.
It would be an easy change to add this feature to
JACL:
Interp.setClassLoader(ClassLoader loader);
Interp.getClassLoader();
And TclClassLoader can use this loader (if
present in Interp) to load classes. For
performance reasons it would be great if
this external loader has priority upon standard
class loading mechanisms.
I beleive that this feature will improve
JACL ability to be embeded into different
applications and environments.
Best regards,
Vladimir.
The TclJava mailing list is sponsored by Scriptics Corporation.
To subscribe: send mail to [EMAIL PROTECTED]
with the word SUBSCRIBE as the subject.
To unsubscribe: send mail to [EMAIL PROTECTED]
with the word UNSUBSCRIBE as the subject.
To send to the list, send email to '[EMAIL PROTECTED]'.
An archive is available at
http://www.mail-archive.com/tcljava@scriptics.com
[Tcl Java] Re: [Tcl Java] External classloader for JACL
I actually like the feature of looking for and loading classes from the jar files. As long as I can still do this through an alternative method (such as TCL_CLASSPATH) it'll work. I can see the benefit of such a system. -Original Message- From: Mo DeJong [mailto:[EMAIL PROTECTED]] Sent: Thursday, March 02, 2000 4:06 PM To: [EMAIL PROTECTED] Subject: [Tcl Java] Re: [Tcl Java] External classloader for JACL Both Jacl and Tcl Blend already use a class loader called TclClassLoader. Is there a feature that you would like to add added to the TclClassLoader or are you looking to bypass it completely? I do not really see anything wrong with adding something to the TclClassLoader or replacing it completely with something better. I really do not like the current design because as a programmer, you need to use the TclClassLoader explicitly, when this type of thing really should be done behind the scenes. I was also planning on stripping out the "feature" of the Tcl Class Loader that automatically looks inside .jar and .zip files that appear on the env(TCL_CLASSPATH). This makes the "worst case" lookup time depend on the number of .zip or .jar files on the file system, which is really ugly. Perhaps we should add a env(TCL_JARPATH) var instead? Mo Dejong Red Hat Inc. On Thu, 2 Mar 2000, Vladimir Zamiatin wrote: Hello! I'm using JACL in web environment. I wrote engine similar to JSP, which allows to embed Tcl scripts in HTML pages. I want to make use of an advanced classloader, provided by servlet runner which has possibility to check for modification of class or source java files in web-applications, and recompile/reload them on-the-fly. I suppose one essential feature is missing in JACL: an ability to use external class loader in interp. It would be an easy change to add this feature to JACL: Interp.setClassLoader(ClassLoader loader); Interp.getClassLoader(); And TclClassLoader can use this loader (if present in Interp) to load classes. For performance reasons it would be great if this external loader has priority upon standard class loading mechanisms. I beleive that this feature will improve JACL ability to be embeded into different applications and environments. Best regards, Vladimir. The TclJava mailing list is sponsored by Scriptics Corporation. To subscribe:send mail to [EMAIL PROTECTED] with the word SUBSCRIBE as the subject. To unsubscribe: send mail to [EMAIL PROTECTED] with the word UNSUBSCRIBE as the subject. To send to the list, send email to '[EMAIL PROTECTED]'. An archive is available at http://www.mail-archive.com/tcljava@scriptics.com The TclJava mailing list is sponsored by Scriptics Corporation. To subscribe:send mail to [EMAIL PROTECTED] with the word SUBSCRIBE as the subject. To unsubscribe: send mail to [EMAIL PROTECTED] with the word UNSUBSCRIBE as the subject. To send to the list, send email to '[EMAIL PROTECTED]'. An archive is available at http://www.mail-archive.com/tcljava@scriptics.com
[Tcl Java] Re: [Tcl Java] External classloader for JACL
Perhaps I was not being clear. I am proposing two changes. 1. Remove the "search for .zip and .jar files" on env(TCL_CLASSPATH) feature. The fact that a use might accidently get .class files from a .jar or .zip file is just plain wrong. 2. Make a new env var called env(TCL_JARPATH) which is a list of directories that will be searched for jar and zip files. So to sum up, env(TCL_CLASSPATH) would no longer be searched for jars and only the directories listed in env(TCL_JARPATH) would be searched. Of course, if you wanted to put the full path name of a .jar file on the env(TCL_CLASSPATH) that would still be supported. Does anyone see a problem with that? This would be going into 1.3 so backward compatibility is not a valid objection. Mo Dejong Red Hat Inc. On Thu, 2 Mar 2000, Thomas McKay wrote: I actually like the feature of looking for and loading classes from the jar files. As long as I can still do this through an alternative method (such as TCL_CLASSPATH) it'll work. I can see the benefit of such a system. -Original Message- From: Mo DeJong [mailto:[EMAIL PROTECTED]] Sent: Thursday, March 02, 2000 4:06 PM To: [EMAIL PROTECTED] Subject: [Tcl Java] Re: [Tcl Java] External classloader for JACL Both Jacl and Tcl Blend already use a class loader called TclClassLoader. Is there a feature that you would like to add added to the TclClassLoader or are you looking to bypass it completely? I do not really see anything wrong with adding something to the TclClassLoader or replacing it completely with something better. I really do not like the current design because as a programmer, you need to use the TclClassLoader explicitly, when this type of thing really should be done behind the scenes. I was also planning on stripping out the "feature" of the Tcl Class Loader that automatically looks inside .jar and .zip files that appear on the env(TCL_CLASSPATH). This makes the "worst case" lookup time depend on the number of .zip or .jar files on the file system, which is really ugly. Perhaps we should add a env(TCL_JARPATH) var instead? Mo Dejong Red Hat Inc. On Thu, 2 Mar 2000, Vladimir Zamiatin wrote: Hello! I'm using JACL in web environment. I wrote engine similar to JSP, which allows to embed Tcl scripts in HTML pages. I want to make use of an advanced classloader, provided by servlet runner which has possibility to check for modification of class or source java files in web-applications, and recompile/reload them on-the-fly. I suppose one essential feature is missing in JACL: an ability to use external class loader in interp. It would be an easy change to add this feature to JACL: Interp.setClassLoader(ClassLoader loader); Interp.getClassLoader(); And TclClassLoader can use this loader (if present in Interp) to load classes. For performance reasons it would be great if this external loader has priority upon standard class loading mechanisms. I beleive that this feature will improve JACL ability to be embeded into different applications and environments. Best regards, Vladimir. The TclJava mailing list is sponsored by Scriptics Corporation. To subscribe:send mail to [EMAIL PROTECTED] with the word SUBSCRIBE as the subject. To unsubscribe: send mail to [EMAIL PROTECTED] with the word UNSUBSCRIBE as the subject. To send to the list, send email to '[EMAIL PROTECTED]'. An archive is available at http://www.mail-archive.com/tcljava@scriptics.com The TclJava mailing list is sponsored by Scriptics Corporation. To subscribe:send mail to [EMAIL PROTECTED] with the word SUBSCRIBE as the subject. To unsubscribe: send mail to [EMAIL PROTECTED] with the word UNSUBSCRIBE as the subject. To send to the list, send email to '[EMAIL PROTECTED]'. An archive is available at http://www.mail-archive.com/tcljava@scriptics.com
