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List:       ant-user
Subject:    Re: Having problem using property to in macrodef if invoke for more than one time
From:       "CheeYang Chau" <cychau () gmail ! com>
Date:       2008-03-28 3:22:59
Message-ID: a229ac000803272022g6f0dcd2avaef66eee29e99f37 () mail ! gmail ! com
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Yes. This is what I do now. Using antcall is safe for parallel task.
I also use macrodef but only to organize tasks that don't produce
property.  In this case, my ant script is always safe to run in
parallel and invoke macrodef for more than one time in same target.

On Fri, Mar 28, 2008 at 11:09 AM, David Weintraub <qazwart@gmail.com> wrote:
> As you've discovered: Once a property is set, it is set forever. You
>  can use the "var" task, but it isn't safe for parallel use. The other
>  way is to append the module's name onto the end of the property name.
>
>  Another solution is to use <antcall> instead of macrodef. The
>  <antcall> task gives you the similar power to <macrodef> but allows
>  you to reset property values:
>
>  Example:
>  <project name="myapp" default="test" basedir=".">
>      <target name="test">
>          <!-- Call Target <foo> twice with different parameters -->
>          <antcall target="foo">
>              <param name="first" value="foo_first"/>
>              <param name="second" value="foo_second"/>
>          </antcall>
>          <antcall target="foo">
>              <param name="first" value="bar_first"/>
>              <param name="second" value="bar_second"/>
>          </antcall>
>      </target>
>
>      <target name="foo">
>          <!-- Set property "testme" and see if it changes between the
>  two <antcall> calls -->
>          <property name="testme" value="${first}"/>
>          <echo message="testme = ${testme} first = ${first} second =
>  ${second}"/>
>      </target>
>  </project>
>
>
>  Output:
>
>  test:
>
>  foo:
>      [echo] testme = foo_first first = foo_first second = foo_second
>
>  foo:
>      [echo] testme = bar_first first = bar_first second = bar_second
>
>  Note that the value of the property testme changed between the two
>  calls to <antcall>.
>
>
>
>  On Thu, Mar 27, 2008 at 1:51 AM, CheeYang Chau <cychau@gmail.com> wrote:
>  > Hi,
>  >
>  >  I love the macrodef task. However, it has a weakness.  We must be very
>  >  careful if using property within the macrodef.  I face problem with a
>  >  macrodef that is more complicated than the following example.  I have
>  >  to use dirname and condition in my macrodef, but it cause problem if I
>  >  invoke macrodef for more than one time as the property has been set
>  >  for the first time.  Here is an example that trying to replay the
>  >  situation I face:
>  >
>  >         <macrodef name="a">
>  >                 <attribute name="module"/>
>  >                 <sequential>
>  >                         <property name="myvalue" value="@{module}"/>
>  >                         <echo>${myvalue}</echo>
>  >                 </sequential>
>  >         </macrodef>
>  >
>  >         <target name="build">
>  >                 <a module="venus"/>
>  >                 <a module="mars"/>
>  >         </target>
>  >
>  >  I expect the output should be
>  >
>  >  [echo] venus
>  >  [echo] mars
>  >
>  >  but it turn out:
>  >
>  >  [echo] venus
>  >  [echo] venus
>  >
>  >  I think this is a common issue using macrodef and there are some
>  >  temporary solution to pass a temporary property name to the macrodef.
>  >  This is not feasible in my situation as I need to pass more than 5 to
>  >  10 properties to my macrodef.
>  >
>  >  Some other solution is using local property but I couldn't find this
>  >  task.  I am using ANT 1.7.0.
>  >
>  >  Any solution?  Please advice.  Thank you very much.
>  >
>  >  --
>  >  Best regards,
>  >  Chau Chee Yang
>  >
>  >  E Stream Software Sdn Bhd
>  >  URL: www.sql.com.my
>  >  SQL Financial Accounting
>  >
>
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>  >
>  >
>
>
>
>  --
>  --
>  David Weintraub
>  qazwart@gmail.com
>
>
>
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>
>



-- 
Best regards,
Chau Chee Yang

E Stream Software Sdn Bhd
URL: www.sql.com.my
SQL Financial Accounting

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