Probs with property expansion in loops

["Rebhan, Gilbert" <Gi...@huk-coburg.de>]

Hi,

i have a problem with properties in <for>

scenario =

Three lists :
- list with all environments that should be served
  (loaded outside all loops)
- list with all servers of one environment
  (loaded in loop 2)
- list of files to be deleted on those servers
- list of files to be copied to those servers
  (generated in the outer loop 1 by a java class,
    loaded in loop 3 and loop 4)

Buildfile structure :

...

<!-- property = list with all environments -->
<loadfile property="Lums" srcFile="K:\r1p1l01a1\luminfo.txt" />

	<target name="main" depends="doall" />

	<target name="doall">

		<!-- // start loop 1 // -->

	<for list="${Lums}" param="Lum">
	<sequential>
	<untar src="K:\r1p1l01a1/@{Lum}/transfer/tarfile_@{Lum}.tar" 
	   dest="K:\r1p1l01a1/@{Lum}/serverdata"
	   overwrite="true" />
				
	<loadfile property="server" srcFile="K:\r1p1l01a1\server_@{Lum}"
/>

<java classname="de. ... .ParseCCLogs" failonerror="true">
	<arg value="K:\r1p1l01a1/@{Lum}/transfer" />
	<arg value="K:\r1p1l01a1/@{Lum}/temp/updated.txt" />
	<arg value="K:\r1p1l01a1/@{Lum}/temp/deleted.txt" />
...
</java>

<!-- files to be deleted on all servers-->		
<loadfile property="updatelist"
srcFile="K:\r1p1l01a1/@{Lum}/temp/updated.txt" />

<!-- files to be copied to all servers-->
<loadfile property="deletelist"
srcFile="K:\r1p1l01a1/@{Lum}/temp/deleted.txt" />


	<!-- // start loop 2 //  -->
	<for list="${server}" param="server">
	<sequential>
                       <!-- // start loop 3 // -->
		<for list="${deletelist}" param="delfile">
		<sequential>
		<echo message="Delete file -> @{delfile}" />
		</sequential>
		</for> <!-- // end loop 3 // -->
     
                         <!-- // start loop 4 // -->
		<for list="${updatelist}" param="copyfile">
		<sequential>
		<echo message="Copy file -> @{copyfile}" />
		</sequential>
		</for> <!-- // end loop 4 // -->

	</sequential>
	</for>	<!-- // end Loop 2 // -->
</sequential>
</for><!-- // end Loop 1 // -->


Problem =

Once the first time the updatelist and deletelist are loaded for the
first environment = @{Lum} it cannot be overwrited for the next
environment in the list ${Lums}.

debugmode says :
Override ignored for property updatelist
Override ignored for property deletelist
when getting into the loop for the second @{Lum}

Question =

How to make that loops work with a list of input properties,
properties expanded correct ?

If for loops are the wrong way, what should i do instead ?

I wanted to avoid several foreach loops.

Any hints ?


Regards, Gilbert

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RE: Probs with property expansion in loops

[Dominique Devienne <dd...@gmail.com>]

> From: Rebhan, Gilbert [mailto:Gilbert.Rebhan@huk-coburg.de]
> i have a problem with properties in <for>
> <snip/>
> Once the first time the updatelist and deletelist are loaded for the
> first environment = @{Lum} it cannot be overwrited for the next
> environment in the list ${Lums}.
> <snip/>
> How to make that loops work with a list of input properties,
> properties expanded correct ?
> <snip/>
> Any hints ?

This is a recognized problem Gilbert. There has been discussions on how to
address it using property scopes, temp name generator, etc...

Currently, the 'canonical' work around is to use a property name which uses
in part a macro param (a for param in your case) to make the name unique.

This translate into roughly the following code:

<for list="${Lums}" param="Lum">
<sequential>
  ..
  <loadfile property="server-@{Lum}"
            srcFile="K:\r1p1l01a1\server_@{Lum}" />

  <loadfile property="updatelist-@{Lum}"
            srcFile="K:\r1p1l01a1/@{Lum}/temp/deleted.txt" />

  ...
  <for list="${server-@{Lum}}" param="server">
    <sequential>
      <for list="${deletelist-@{Lum}}" param="delfile">
      ...

The property name is defined in terms of @{Lum} to make it unique, and
referenced as usual, even though it looks a bit weird, as ${foo-@{Lum}}.

We're hoping to have a better solution for Ant 1.7. --DD


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