Question

Conditional Ant Task

Asked by: ECWeb

Hello,

I have an ant task that does an scp to a couple places:

<target name="copy-lib-jars">
        <!-- copy the share jars -->
        <scp todir="${user.name}@${hostname.1}:${server.location}/${wldomain}/lib"
             keyfile="${user.home}/.ssh/id_rsa"
             passphrase="">
              <fileset dir="${share.dir}" includes="*.jar" />
        </scp>
        <scp todir="${user.name}@${hostname.2}:${server.location}/${wldomain}/lib"
             keyfile="${user.home}/.ssh/id_rsa"
             passphrase="">
              <fileset dir="${share.dir}" includes="*.jar" />
        </scp>
            
            <!-- copy the third party jars -->
        <scp todir="${user.name}@${hostname.1}:${server.location}/${wldomain}/lib"
             keyfile="${user.home}/.ssh/id_rsa"
             passphrase="">
              <fileset dir="${third-party.dir}" includes="*.jar" />
        </scp>
        <scp todir="${user.name}@${hostname.2}:${server.location}/${wldomain}/lib"
             keyfile="${user.home}/.ssh/id_rsa"
             passphrase="">
              <fileset dir="${third-party.dir}" includes="*.jar" />
        </scp>
</target>

It could be that in share.dir and third-party.dir there are no files to copy.  I would like to run a seperate target which will restart a Weblogic server only if there are files to copy in those directories.  If no files were are present to copy, the target that restarts the Weblogic server doesn't get executed.  Is there any way to do this?   Perhaps a third party package?

Here's the task that restarts the weblogic server:

    <target name="restart.clusters">
          <echo message="Shutting down ${domain.folder} on ${domain.server.1}"/>
          <sshexec host="${domain.server.1}"
                username="${domain.username}"
                keyfile="${user.home}/.ssh/id_rsa"
                passphrase=""
                command="cd ${domain.location}/${domain.folder}; ./stop81.sh cluster1.conf"
              failonerror="false"/>
      <!-- three more like this one -->
     </target>

Thanks,
Tim

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Asked On
2005-08-10 at 11:23:58ID21522631
Tags

ant

,

conditional

,

task

Topics

Java Programming Language

,

J2EE

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: gadioPosted on 2005-08-10 at 14:12:13ID: 14646543

Please look at
http://ant.apache.org/manual/CoreTasks/condition.html
and the supported conditions at http://ant.apache.org/manual/CoreTasks/conditions.html
You can set a property based on the existance of files and then use that in the task and an execution condition.

G

 

by: gadioPosted on 2005-08-10 at 14:14:39ID: 14646574

Setting a condition on a target:

<target name="build-module-A" if="my-condition">
....
</target>

See: http://ant.apache.org/manual/using.html#targets

 

by: grim_toasterPosted on 2005-08-11 at 02:06:26ID: 14649840

If the built in support for conditionals in Ant doesn't meet your requirements, you could try antcontrib:

http://ant-contrib.sourceforge.net

The task definitions are at:
http://ant-contrib.sourceforge.net/tasks/tasks/index.html

Not only does this provide if/else constructs but it can also provide you with a forEach statement which would mean your code above need only to provide a list of machine to iterate over to copy the files to, avoiding the large amount of duplicate code (especially if you add additional nodes to your cluster).

 

by: ECWebPosted on 2005-08-11 at 08:28:57ID: 14652417

Thanks for your responses, turns out it wasn't as hard as I thought it would be.

20120131-EE-VQP-002

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