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Date: Sun, 13 Mar 2011 01:38:18 -0600
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Subject: Re: How to manage properties for identical tasks/macros run in
 parallel?
From: Matt Benson <gudnabrsam@gmail.com>
To: Ant Users List <user@ant.apache.org>
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You should see the <local> task, whereby you can set up scoped
property "shadowing."

Matt

On Sat, Mar 12, 2011 at 10:59 PM, Parag Doke
<parag.doke+techie@gmail.com> wrote:
> Any ideas anyone ?
> Thanks in advance,
> Parag Doke
> Save paper, save trees. Do not print emails/documents unless
> absolutely necessary.
>
>
>
> On Mon, Mar 7, 2011 at 12:52 PM, Parag Doke <parag.doke+techie@gmail.com>=
 wrote:
>> Hello ant users.
>> I am facing an issue with handling properties with calls to tasks/macros
>> nested within the parallel task. More of a logical/approach related issu=
e
>> rather than anything with the tool itself. Here go the details:
>> Using ant:
>> Apache Ant version 1.8.1 compiled on April 30 2010
>> With Java:
>> java version "1.6.0_22"
>> Java(TM) SE Runtime Environment (build 1.6.0_22-b04)
>> Java HotSpot(TM) Client VM (build 17.1-b03, mixed mode, sharing)
>> The most relevant part of the build.xml:
>> =A0=A0 =A0 =A0 =A0<parallel>
>> =A0=A0 =A0 =A0 =A0 =A0 =A0<mySleep seconds=3D"4"/>
>> =A0=A0 =A0 =A0 =A0 =A0 =A0<mySleep seconds=3D"3"/>
>> =A0=A0 =A0 =A0 =A0 =A0 =A0<mySleep seconds=3D"2"/>
>> =A0=A0 =A0 =A0 =A0 =A0 =A0<mySleep seconds=3D"1"/>
>> =A0=A0 =A0 =A0 =A0</parallel>
>> mySleep is my own macro with the following declaration:
>> =A0=A0 =A0<macrodef name=3D"mySleep">
>> =A0=A0 =A0 =A0 =A0<attribute name=3D"seconds"/>
>> =A0=A0 =A0 =A0 =A0<sequential>
>> =A0=A0 =A0 =A0 =A0 =A0 =A0<sleep seconds=3D"@{seconds}"/> <!-- In my act=
ual case, this is
>> exec calls with the outputproperty attribute -->
>> =A0=A0 =A0 =A0 =A0 =A0 =A0<property name=3D"myProp" value=3D"my value =
=3D @{seconds}"/>
>> =A0=A0 =A0 =A0 =A0 =A0 =A0<echo>Now working with ${myProp}</echo>
>> =A0=A0 =A0 =A0 =A0</sequential>
>> =A0=A0 =A0</macrodef>
>> Since properties are immutable, if it so happens that the 4th macro call
>> sets the property, the rest of them cannot modify it. A quick alternativ=
e to
>> this might be using the variable task (in place of property) from
>> ant-contrib.sf.net. However, the above is just an example. In reality, m=
y
>> macro does an exec call. The outputproperty attribute to the exec call w=
ill
>> be what I need to process later.
>> So I guess my questions are:
>> 1) What is the best approach to handle properties/variables for (almost)
>> identical macro calls ? I cannot modify the property name each time. I c=
ould
>> redirect stdout/stderr of the exec task to some file. But not sure how t=
o
>> guarantee that the file will be unique and not get overwritten if 2 task=
s
>> finish at the same instant of time.
>> 2) Can the outputproperty value be captured in a variable directly ? I r=
ead
>> that it is possible to use the ant-contrib propertycopy task to get one
>> property value into another. But then there is a risk that the copy migh=
t
>> not be synchronized ...
>> The last option I have is of course to get rid of the parallel task and =
let
>> the macros run one after the other. But that would be modifying the
>> requirement to suit the scripting limitation I've run into. So I thought=
 of
>> asking here before jumping on any implementation.
>> Thanks in advance for any pointers,
>> Parag Doke
>> Save paper, save trees. Do not print emails/documents unless absolutely
>> necessary.
>>
>
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