Re: hotswap via ant

[David Kavanagh]

Matt,
Have you used the <outofdate> target from ant-contrib? I'm not having 
any luck. I have 0.6 (and even tried building it myself from the sources).
I have run the <stopwatch> task, so I know the library is being picked 
up. I get this error when it hits my <outofdate> target.

BUILD FAILED
C:\view\dkavanag\1411_view\payx\inc\inc_comm.xml:115: 
C:\view\dkavanag\1411_view
\payx\payentry\dev\1.4 not found.

Here is what my build.xml looks like (part of it anyway)
   <outofdate verbose="true" property="doswap" 
outputtargets="swap.classes">
       <sourcefiles>
           <fileset dir="${build.source}" includes="**/*.java"/>
       </sourcefiles>
       <mapper type="regexp" from="^(.*)\.java$$" 
to="../${build.classes.dir}/\1.class"/>
   </outofdate>

Line 115 is that first line in the <outofdate> task.
Any pointers would be great. I think I'm done with the <hotswap> task 
itself... just like to test with the supporting cast...

David
Thus Spoke Matt Benson:
You should be able to use the date pattern "MM/dd/yyyy
hh:mm a" to add the AM/PM to your date.  That's wild
that the date selector doesn't use seconds.  Two
possibilities come to mind:
-sleep for a minute after generating the timestamp. :(
-use ant-contrib's <outofdate> task to set a
comma-delimited list of out-of-date target files into
a property, to be used as the includes attribute of a
<fileset>.
In Ant, two things that would also make sense:
-Add a format attribute to the date selector,
defaulting to the current one.
-Add a millis attribute to <tstamp>, incompatible with
its pattern attribute.
-Matt
--- David Kavanagh <[EMAIL PROTECTED]> wrote:
 

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!
           

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