Re: hotswap via ant

[David Kavanagh]

It's Alive! Now, I just need some help working out the file selection 
part. (which is using existing Ant constructs).
Here is a sample of my build file.

<target name="hotswap" depends="init" description="Compile and Hotswap 
changed classes">
   <taskdef name="hotswap" 
classname="org.apache.tools.ant.taskdefs.Hotswap"/>
   <mkdir dir="${build.classes.dir}"/>   
   <tstamp>
       <format property="class.stamp" pattern="MM/dd/yyyy hh:mm" />
   </tstamp>
   <echo message="timestamp = ${class.stamp}"/>
   <javac .../>
   <hotswap verbose="true" hotswap="true" hsaddress="9000">
       <fileset dir="${build.classes.dir}" includes="**/*.class">
           <date datetime="${class.stamp} AM" when="after"/>
       </fileset>
   </hotswap>
</target>

This is an example of the timestamp that is returned. Is there a way to 
get this to use seconds as well? The granularity doesn't seem good 
enough for my purpose.
    [echo] timestamp = 04/02/2004 11:07

In the <date>, it requires the AM or PM part, which I'm just putting in 
by hand (which isn't good either). Is there a better way to select files 
that have changed in the classes dir since the javac has run?

Once I get this worked out, I'll clean up the task a little and make it 
available for everyone to try. (and provide some docs as well!)

Thanks,
David
PS. I tested this by coding a specific class filename, since the date 
thing isn't working yet.

Thus Spoke Matt Benson:
http://ant.apache.org/manual/CoreTypes/selectors.html#dateselect
You would have to use a nested <format> element in
your <tstamp> to create the date in the right format
for the date selector, but aside from that I can't see
any problems...
-Matt
--- [EMAIL PROTECTED] wrote:
 

This sounds good to me! The less grunt work I have
to do in my task, the better!
I grabbed teh 1.6.1 source release and built it. If
you could point me to the
<date> file selector you mention, it would help me a
lot. I just poked around
and it didn't jump out at me. I would like it if my
task could just deal with a
list of class files provided via some built-in
filtering means.
Thanks,
David
Quoting Matt Benson <[EMAIL PROTECTED]>:
   

Basically you should make any task as atomic as
possible.  So all your task would need to know
     

about
   

is a <fileset>.  Then it becomes the user's
     

problem
   

how to select which files to include.  One way
     

might
   

be to use a <tstamp>
to set a baseline time, then compile, then use a
<date> file selector to get the updated classes. 
Another way might use ant-contrib's <outofdate> to
determine which sources should be recompiled.  You
could then compile only those sources to some
temporary build area, then hotswap only those
     

classes.
   

The point is that others have designed ways in
     

which
   

the files can be selected, so you gain maximum
flexibility (and minimum RESPONSIBILITY) the less
     

your
   

Task is expected to do.
-Matt
--- [EMAIL PROTECTED] wrote:
     

When I was toying with a separate task, I
       

wondered
   

if <uptodate> could be use
somehow to create a <fileset>. I don't see now,
       

but
   

that would sure be a nice
feature. Then, if I could assign an ID so I
       

could
   

make a <fileset> of files
that aren't uptodate, run the compile, then take
that same <fileset> as input
to the <hotswap> target.
The idea of a timestamp file could work. The
sequence might be something like.
<touch file="timestamp"/>
<javac .../>
<hotswap classesdir="foo" host="localhost"
port="9000" timefile="timestamp">
 <patternset>
    ... some pattern to apply to the classes
       

dir
   

...
 </patternset>
</hotswap>
That way, the hotswap task would check the files
       

in
   

the classes dir based on the
patternset and/or the timestamp.
Seriously, I'm open to feedback. I might as well
       

do
   

it right the first time!
David
Quoting Steve Loughran <[EMAIL PROTECTED]>:
       


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