Hi Hans,
Sorry for late response.
Here's scenario where the same Script runs again and again with
different context. So I keep the Script object and run it with fresh new
JellyContexts which have the same parent JellyContext so that I don't
need to register all the home made tag libraries repeatedly. But
sometimes, the logic executed in MyTag doesn't depend on context at all.
Give you an example which is not the exact one that I'm working on.
<mylib:Courses var="allCourses"> <!--Create a list variable-->
<mylib:CourseOperationSystem/> <!-- Add courses to allCourse
variable one by one-->
<mylib:CourseCompilerConstruction/>
<mylib:CourseAdvancedSoftwareEngineering/>
... another 100 courses...
</mylib:Courses>
<echo>Student ${student} want to take all courses</echo>
<!--student comes from context, it could be different every time the
script runs -->
<mylib:TakeCourses student="${student}" courses="${allCourses}"/>
--------------------------
JellyContext rootContext = new JellyContext();
rootContext.registerTagLibrary("my taglib uri", new MyTagLibrary());
Script script = rootContext.compileScript(theScriptFile);
JellyContext jc = new JellyContext(rootContext);
jc.setVariable("student", "John");
script.run(jc, output);
jc = new JellyContext(rootContext);
jc.setVariable("student", "Tommy");
script.run(jc, output);
...
If I can assume that the creating each course doesn't need context, I
actually know the full course list after the first time this script
runs. If I can cache the course list somewhere in TagScript, I don't
need to create 103 courses again and again. Because <Courses> tag can be
used somewhere else in this script, I need a key to identify this guy. I
can't simply save the list in CourseTag class because tag class is
transient. Another option is forcing script writer to put an id
attribute. But internal key makes it look simpler.
So my question is can I get unique ID for TagScript where I'm in
corresponding Tag class.
Let me know if I didn't explain the question clearly. Thanks for your time.
Regards
Jiaqi
Hans Gilde wrote:
Well, this doesn't sound like a good thing to be doing. Could you describe
the purpose, maybe there is another approach?
-----Original Message-----
From: Guo, Jiaqi [mailto:[EMAIL PROTECTED]
Sent: Tuesday, August 02, 2005 2:06 PM
To: [email protected]
Subject: [jelly] Can I get the unique ID for current TagScript
When I'm in a home-made Tag class, can I get a unique identifier for the
current TagScript? So that next time the same tag in the same script is
invoked, I know it's the same thing. Therefore, if I want to cache
something I can do it.
I can't take MyTag.hashCode() because Tag is transient object in my
case. Can I do MyTag.getBody().hashCode()? It doesn't sound well for
those tags without body.
Any solution for it? Thanks.
Jiaqi
[EMAIL PROTECTED]
http://www.cyclopsgroup.com
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