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Posted to user@commons.apache.org by Jiaqi Guo <ji...@evavi.com> on 2004/11/01 20:41:07 UTC
[jelly] Stateless/Stateful Tag?
Hi everyone,
I want to reuse jelly Script object since in my current project, Script
will run frequently with different given JellyContext created at runtime
and I don't want to create Script and Tag objects time and time again.
My concern is, in TagScript, Tag object is cached in ThreadLocal and
runtime JellyContext object is sitting in Tag object. So runtime context
is saved until next time the Script runs. To my understanding,
JellyContext should not be saved because it's transient. Putting it into
Tag object makes developer easy, and makes Tag object stateful.
Is there any thing I can do to clean Tag objects after the doTag method
is called without explicitely add setContext(null) in each doTag()
method, or prevent Tag from absorbing JellyContext into itself? Any
suggestions?
Thanks
Jiaqi
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Re: [jelly] Stateless/Stateful Tag?
Posted by Jiaqi <cy...@gmail.com>.
Hans,
I see. Thank you very much.
I think it solves the problem
Jiaqi
On Wed, 03 Nov 2004 18:16:17 -0500, Hans Gilde
<hg...@earthlink.net> wrote:
> Jiaqi,
>
> For option (1) you wouldn't need to modify any tags, you would override the
> runScript methods in JellyContext.
>
> For option (2), yes, you would write a "smart" jelly context that knows
> about its children.
>
> Both are fairly easy.
>
>
>
> Hans
>
> -----Original Message-----
> From: Jiaqi [mailto:cyclopsgroup@gmail.com]
> Sent: Wednesday, November 03, 2004 2:23 PM
> To: Hans Gilde; Jakarta Commons Users List
> Subject: Re: [jelly] Stateless/Stateful Tag?
>
> Hi Hans,
>
> "* Clear the variables for a tag as soon as the tag's finished
> running." Does this mean I need to write
> "context.getVariables().clear()" in EVERY doTag()? If it does, it
> would be a nightmare for me since there're hundreds of tags.
>
> clearAllVariables sounds good but I'm not sure how to do it. In
> to-level, I have a Script, one root JellyContext. How can I clear all
> variables in a hierarchy of JellyContext objects?
>
> Do you mean I should write a SmartJellyContext which knows it's children?
>
> Thanks a lot
> Jiaqi
>
> On Tue, 02 Nov 2004 23:40:51 -0500, Hans Gilde
> <hg...@earthlink.net> wrote:
> > This has been discussed recently. Some are in favor of passing the context
> > down through the execution chain, some are in favor of separating the
> > variable storage from the rest of the context.
> >
> > We may be able to solve your problem without deciding the issue now.
> >
> > JellyContext is designed to be sub classed by the end user, to provide
> > custom memory management. We can't clear out the actual context objects
> but
> > maybe we can do the next best thing by clearing out the HashMap of
> > variables.
> >
> > You could:
> >
> > * Clear the variables for a tag as soon as the tag's finished running.
> > * Provide a method on the top-level context, "clearAllVariables", to let
> you
> > programmatically clear the top-level and all child context variables
> between
> > runs.
> >
> > Would either of these work for you? If so, your problem can be solved
> pretty
> > quickly with only a custom JellyContext.
> >
> > Hans
> >
> >
> >
> > -----Original Message-----
> > From: Jiaqi [mailto:cyclopsgroup@gmail.com]
> > Sent: Tuesday, November 02, 2004 12:56 PM
> > To: Jakarta Commons Users List
> > Subject: Re: [jelly] Stateless/Stateful Tag?
> >
> > So what is the best practice for developer to frequently execute
> > predefined jelly script?
> >
> > In my project, process is defined in xml file, which will not be
> > changed logically, which could be very complicated. Logically volatile
> > stuff is variables (like current user name and form data). It's easier
> > for me to model process definition with tag/scripts and put variables
> > into JellyContext. Otherwise, I can not figure out any solution else.
> >
> > What is your suggestions? Thanks
> >
> > On Tue, 2 Nov 2004 09:37:25 +0100, Paul Libbrecht <pa...@activemath.org>
> > wrote:
> > > Mmmh,
> > >
> > > I would rather view the contrary: tag and tagscript objects are
> > > entirely volatile where the context is something that stores exactly
> > > how much you want (that is, not more than needed).
> > > So I'd rather rely on the jelly-context to add states of the tag...
> > >
> > > paul
> > >
> > > Le 1 nov. 04, à 20:41, Jiaqi Guo a écrit :
> > >
> > >
> > >
> > > > Hi everyone,
> > > >
> > > > I want to reuse jelly Script object since in my current project,
> > > > Script will run frequently with different given JellyContext created
> > > > at runtime and I don't want to create Script and Tag objects time and
> > > > time again.
> > > >
> > > > My concern is, in TagScript, Tag object is cached in ThreadLocal and
> > > > runtime JellyContext object is sitting in Tag object. So runtime
> > > > context is saved until next time the Script runs. To my understanding,
> > > > JellyContext should not be saved because it's transient. Putting it
> > > > into Tag object makes developer easy, and makes Tag object stateful.
> > > >
> > > > Is there any thing I can do to clean Tag objects after the doTag
> > > > method is called without explicitely add setContext(null) in each
> > > > doTag() method, or prevent Tag from absorbing JellyContext into
> > > > itself? Any suggestions?
> > > >
> > > >
> > > >
> > > > Thanks
> > > > Jiaqi
> > > >
> > > >
> > > > ---------------------------------------------------------------------
> > > > To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> > > > For additional commands, e-mail: commons-user-help@jakarta.apache.org
> > > >
> > >
> > > ---------------------------------------------------------------------
> > > To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> > > For additional commands, e-mail: commons-user-help@jakarta.apache.org
> > >
> > >
> >
> > --
> > Regards
> > JIaqi
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> > For additional commands, e-mail: commons-user-help@jakarta.apache.org
> >
> >
>
> --
> Regards
> JIaqi
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: commons-user-help@jakarta.apache.org
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: commons-user-help@jakarta.apache.org
>
>
--
Regards
JIaqi
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RE: [jelly] Stateless/Stateful Tag?
Posted by Hans Gilde <hg...@earthlink.net>.
Jiaqi,
For option (1) you wouldn't need to modify any tags, you would override the
runScript methods in JellyContext.
For option (2), yes, you would write a "smart" jelly context that knows
about its children.
Both are fairly easy.
Hans
-----Original Message-----
From: Jiaqi [mailto:cyclopsgroup@gmail.com]
Sent: Wednesday, November 03, 2004 2:23 PM
To: Hans Gilde; Jakarta Commons Users List
Subject: Re: [jelly] Stateless/Stateful Tag?
Hi Hans,
"* Clear the variables for a tag as soon as the tag's finished
running." Does this mean I need to write
"context.getVariables().clear()" in EVERY doTag()? If it does, it
would be a nightmare for me since there're hundreds of tags.
clearAllVariables sounds good but I'm not sure how to do it. In
to-level, I have a Script, one root JellyContext. How can I clear all
variables in a hierarchy of JellyContext objects?
Do you mean I should write a SmartJellyContext which knows it's children?
Thanks a lot
Jiaqi
On Tue, 02 Nov 2004 23:40:51 -0500, Hans Gilde
<hg...@earthlink.net> wrote:
> This has been discussed recently. Some are in favor of passing the context
> down through the execution chain, some are in favor of separating the
> variable storage from the rest of the context.
>
> We may be able to solve your problem without deciding the issue now.
>
> JellyContext is designed to be sub classed by the end user, to provide
> custom memory management. We can't clear out the actual context objects
but
> maybe we can do the next best thing by clearing out the HashMap of
> variables.
>
> You could:
>
> * Clear the variables for a tag as soon as the tag's finished running.
> * Provide a method on the top-level context, "clearAllVariables", to let
you
> programmatically clear the top-level and all child context variables
between
> runs.
>
> Would either of these work for you? If so, your problem can be solved
pretty
> quickly with only a custom JellyContext.
>
> Hans
>
>
>
> -----Original Message-----
> From: Jiaqi [mailto:cyclopsgroup@gmail.com]
> Sent: Tuesday, November 02, 2004 12:56 PM
> To: Jakarta Commons Users List
> Subject: Re: [jelly] Stateless/Stateful Tag?
>
> So what is the best practice for developer to frequently execute
> predefined jelly script?
>
> In my project, process is defined in xml file, which will not be
> changed logically, which could be very complicated. Logically volatile
> stuff is variables (like current user name and form data). It's easier
> for me to model process definition with tag/scripts and put variables
> into JellyContext. Otherwise, I can not figure out any solution else.
>
> What is your suggestions? Thanks
>
> On Tue, 2 Nov 2004 09:37:25 +0100, Paul Libbrecht <pa...@activemath.org>
> wrote:
> > Mmmh,
> >
> > I would rather view the contrary: tag and tagscript objects are
> > entirely volatile where the context is something that stores exactly
> > how much you want (that is, not more than needed).
> > So I'd rather rely on the jelly-context to add states of the tag...
> >
> > paul
> >
> > Le 1 nov. 04, à 20:41, Jiaqi Guo a écrit :
> >
> >
> >
> > > Hi everyone,
> > >
> > > I want to reuse jelly Script object since in my current project,
> > > Script will run frequently with different given JellyContext created
> > > at runtime and I don't want to create Script and Tag objects time and
> > > time again.
> > >
> > > My concern is, in TagScript, Tag object is cached in ThreadLocal and
> > > runtime JellyContext object is sitting in Tag object. So runtime
> > > context is saved until next time the Script runs. To my understanding,
> > > JellyContext should not be saved because it's transient. Putting it
> > > into Tag object makes developer easy, and makes Tag object stateful.
> > >
> > > Is there any thing I can do to clean Tag objects after the doTag
> > > method is called without explicitely add setContext(null) in each
> > > doTag() method, or prevent Tag from absorbing JellyContext into
> > > itself? Any suggestions?
> > >
> > >
> > >
> > > Thanks
> > > Jiaqi
> > >
> > >
> > > ---------------------------------------------------------------------
> > > To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> > > For additional commands, e-mail: commons-user-help@jakarta.apache.org
> > >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> > For additional commands, e-mail: commons-user-help@jakarta.apache.org
> >
> >
>
> --
> Regards
> JIaqi
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: commons-user-help@jakarta.apache.org
>
>
--
Regards
JIaqi
---------------------------------------------------------------------
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Re: [jelly] Stateless/Stateful Tag?
Posted by Jiaqi <cy...@gmail.com>.
Hi Hans,
"* Clear the variables for a tag as soon as the tag's finished
running." Does this mean I need to write
"context.getVariables().clear()" in EVERY doTag()? If it does, it
would be a nightmare for me since there're hundreds of tags.
clearAllVariables sounds good but I'm not sure how to do it. In
to-level, I have a Script, one root JellyContext. How can I clear all
variables in a hierarchy of JellyContext objects?
Do you mean I should write a SmartJellyContext which knows it's children?
Thanks a lot
Jiaqi
On Tue, 02 Nov 2004 23:40:51 -0500, Hans Gilde
<hg...@earthlink.net> wrote:
> This has been discussed recently. Some are in favor of passing the context
> down through the execution chain, some are in favor of separating the
> variable storage from the rest of the context.
>
> We may be able to solve your problem without deciding the issue now.
>
> JellyContext is designed to be sub classed by the end user, to provide
> custom memory management. We can't clear out the actual context objects but
> maybe we can do the next best thing by clearing out the HashMap of
> variables.
>
> You could:
>
> * Clear the variables for a tag as soon as the tag's finished running.
> * Provide a method on the top-level context, "clearAllVariables", to let you
> programmatically clear the top-level and all child context variables between
> runs.
>
> Would either of these work for you? If so, your problem can be solved pretty
> quickly with only a custom JellyContext.
>
> Hans
>
>
>
> -----Original Message-----
> From: Jiaqi [mailto:cyclopsgroup@gmail.com]
> Sent: Tuesday, November 02, 2004 12:56 PM
> To: Jakarta Commons Users List
> Subject: Re: [jelly] Stateless/Stateful Tag?
>
> So what is the best practice for developer to frequently execute
> predefined jelly script?
>
> In my project, process is defined in xml file, which will not be
> changed logically, which could be very complicated. Logically volatile
> stuff is variables (like current user name and form data). It's easier
> for me to model process definition with tag/scripts and put variables
> into JellyContext. Otherwise, I can not figure out any solution else.
>
> What is your suggestions? Thanks
>
> On Tue, 2 Nov 2004 09:37:25 +0100, Paul Libbrecht <pa...@activemath.org>
> wrote:
> > Mmmh,
> >
> > I would rather view the contrary: tag and tagscript objects are
> > entirely volatile where the context is something that stores exactly
> > how much you want (that is, not more than needed).
> > So I'd rather rely on the jelly-context to add states of the tag...
> >
> > paul
> >
> > Le 1 nov. 04, à 20:41, Jiaqi Guo a écrit :
> >
> >
> >
> > > Hi everyone,
> > >
> > > I want to reuse jelly Script object since in my current project,
> > > Script will run frequently with different given JellyContext created
> > > at runtime and I don't want to create Script and Tag objects time and
> > > time again.
> > >
> > > My concern is, in TagScript, Tag object is cached in ThreadLocal and
> > > runtime JellyContext object is sitting in Tag object. So runtime
> > > context is saved until next time the Script runs. To my understanding,
> > > JellyContext should not be saved because it's transient. Putting it
> > > into Tag object makes developer easy, and makes Tag object stateful.
> > >
> > > Is there any thing I can do to clean Tag objects after the doTag
> > > method is called without explicitely add setContext(null) in each
> > > doTag() method, or prevent Tag from absorbing JellyContext into
> > > itself? Any suggestions?
> > >
> > >
> > >
> > > Thanks
> > > Jiaqi
> > >
> > >
> > > ---------------------------------------------------------------------
> > > To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> > > For additional commands, e-mail: commons-user-help@jakarta.apache.org
> > >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> > For additional commands, e-mail: commons-user-help@jakarta.apache.org
> >
> >
>
> --
> Regards
> JIaqi
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: commons-user-help@jakarta.apache.org
>
>
--
Regards
JIaqi
---------------------------------------------------------------------
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Re: [jelly] Stateless/Stateful Tag?
Posted by Paul Libbrecht <pa...@activemath.org>.
Le 2 nov. 04, à 18:56, Jiaqi a écrit :
> So what is the best practice for developer to frequently execute
> predefined jelly script?
jelly define taglib ?
> In my project, process is defined in xml file, which will not be
> changed logically, which could be very complicated. Logically volatile
> stuff is variables (like current user name and form data). It's easier
> for me to model process definition with tag/scripts and put variables
> into JellyContext. Otherwise, I can not figure out any solution else.
Remember you can always make a nested context which would contain such
information...
paul
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RE: [jelly] Stateless/Stateful Tag?
Posted by Hans Gilde <hg...@earthlink.net>.
This has been discussed recently. Some are in favor of passing the context
down through the execution chain, some are in favor of separating the
variable storage from the rest of the context.
We may be able to solve your problem without deciding the issue now.
JellyContext is designed to be sub classed by the end user, to provide
custom memory management. We can't clear out the actual context objects but
maybe we can do the next best thing by clearing out the HashMap of
variables.
You could:
* Clear the variables for a tag as soon as the tag's finished running.
* Provide a method on the top-level context, "clearAllVariables", to let you
programmatically clear the top-level and all child context variables between
runs.
Would either of these work for you? If so, your problem can be solved pretty
quickly with only a custom JellyContext.
Hans
-----Original Message-----
From: Jiaqi [mailto:cyclopsgroup@gmail.com]
Sent: Tuesday, November 02, 2004 12:56 PM
To: Jakarta Commons Users List
Subject: Re: [jelly] Stateless/Stateful Tag?
So what is the best practice for developer to frequently execute
predefined jelly script?
In my project, process is defined in xml file, which will not be
changed logically, which could be very complicated. Logically volatile
stuff is variables (like current user name and form data). It's easier
for me to model process definition with tag/scripts and put variables
into JellyContext. Otherwise, I can not figure out any solution else.
What is your suggestions? Thanks
On Tue, 2 Nov 2004 09:37:25 +0100, Paul Libbrecht <pa...@activemath.org>
wrote:
> Mmmh,
>
> I would rather view the contrary: tag and tagscript objects are
> entirely volatile where the context is something that stores exactly
> how much you want (that is, not more than needed).
> So I'd rather rely on the jelly-context to add states of the tag...
>
> paul
>
> Le 1 nov. 04, à 20:41, Jiaqi Guo a écrit :
>
>
>
> > Hi everyone,
> >
> > I want to reuse jelly Script object since in my current project,
> > Script will run frequently with different given JellyContext created
> > at runtime and I don't want to create Script and Tag objects time and
> > time again.
> >
> > My concern is, in TagScript, Tag object is cached in ThreadLocal and
> > runtime JellyContext object is sitting in Tag object. So runtime
> > context is saved until next time the Script runs. To my understanding,
> > JellyContext should not be saved because it's transient. Putting it
> > into Tag object makes developer easy, and makes Tag object stateful.
> >
> > Is there any thing I can do to clean Tag objects after the doTag
> > method is called without explicitely add setContext(null) in each
> > doTag() method, or prevent Tag from absorbing JellyContext into
> > itself? Any suggestions?
> >
> >
> >
> > Thanks
> > Jiaqi
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> > For additional commands, e-mail: commons-user-help@jakarta.apache.org
> >
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: commons-user-help@jakarta.apache.org
>
>
--
Regards
JIaqi
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Re: [jelly] Stateless/Stateful Tag?
Posted by Jiaqi <cy...@gmail.com>.
So what is the best practice for developer to frequently execute
predefined jelly script?
In my project, process is defined in xml file, which will not be
changed logically, which could be very complicated. Logically volatile
stuff is variables (like current user name and form data). It's easier
for me to model process definition with tag/scripts and put variables
into JellyContext. Otherwise, I can not figure out any solution else.
What is your suggestions? Thanks
On Tue, 2 Nov 2004 09:37:25 +0100, Paul Libbrecht <pa...@activemath.org> wrote:
> Mmmh,
>
> I would rather view the contrary: tag and tagscript objects are
> entirely volatile where the context is something that stores exactly
> how much you want (that is, not more than needed).
> So I'd rather rely on the jelly-context to add states of the tag...
>
> paul
>
> Le 1 nov. 04, à 20:41, Jiaqi Guo a écrit :
>
>
>
> > Hi everyone,
> >
> > I want to reuse jelly Script object since in my current project,
> > Script will run frequently with different given JellyContext created
> > at runtime and I don't want to create Script and Tag objects time and
> > time again.
> >
> > My concern is, in TagScript, Tag object is cached in ThreadLocal and
> > runtime JellyContext object is sitting in Tag object. So runtime
> > context is saved until next time the Script runs. To my understanding,
> > JellyContext should not be saved because it's transient. Putting it
> > into Tag object makes developer easy, and makes Tag object stateful.
> >
> > Is there any thing I can do to clean Tag objects after the doTag
> > method is called without explicitely add setContext(null) in each
> > doTag() method, or prevent Tag from absorbing JellyContext into
> > itself? Any suggestions?
> >
> >
> >
> > Thanks
> > Jiaqi
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> > For additional commands, e-mail: commons-user-help@jakarta.apache.org
> >
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: commons-user-help@jakarta.apache.org
>
>
--
Regards
JIaqi
---------------------------------------------------------------------
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Re: [jelly] Stateless/Stateful Tag?
Posted by Paul Libbrecht <pa...@activemath.org>.
Mmmh,
I would rather view the contrary: tag and tagscript objects are
entirely volatile where the context is something that stores exactly
how much you want (that is, not more than needed).
So I'd rather rely on the jelly-context to add states of the tag...
paul
Le 1 nov. 04, à 20:41, Jiaqi Guo a écrit :
> Hi everyone,
>
> I want to reuse jelly Script object since in my current project,
> Script will run frequently with different given JellyContext created
> at runtime and I don't want to create Script and Tag objects time and
> time again.
>
> My concern is, in TagScript, Tag object is cached in ThreadLocal and
> runtime JellyContext object is sitting in Tag object. So runtime
> context is saved until next time the Script runs. To my understanding,
> JellyContext should not be saved because it's transient. Putting it
> into Tag object makes developer easy, and makes Tag object stateful.
>
> Is there any thing I can do to clean Tag objects after the doTag
> method is called without explicitely add setContext(null) in each
> doTag() method, or prevent Tag from absorbing JellyContext into
> itself? Any suggestions?
>
>
>
> Thanks
> Jiaqi
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: commons-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: commons-user-help@jakarta.apache.org
>
---------------------------------------------------------------------
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