I was wondering if you can help me with my question, very much the same as
from this thread:
http://www.ant-tasks.com/msg/11730.html
I wasn't sure how one would create the custom datatype that shares a
dbConnection. I have not found any info on the web that describes this
fully.
For instance you say dataref attribute but i wasn't sure how to write that
in a custom datatype, and have it shared.
------Bertrand Fontaine wrote:
I have a set of Tasks all requiring access to the very same class
instance (a db connection in practice). How can I implement that with
ANT?
So far, I have tried to implement this behaviour via a TaskContainer
but I can't get back the TaskContainer instance from a Task, and hence
the reference to the object I would like to share via the
TaskContainer, as far as the TaskContainer and the Tasks are loaded in
separate class loaders.
Thank you,
Bertrand Fontaine
Hi Bertrand,
what I would do would be the following :
- create a custom ant datatype encapsulating the object(s) that you want
to share between tasks,
- use <typedef/> to declare your datatype (or put all your typedefs and
taskdefs into an antlib descriptor)
- then you can declare one or several instance(s) of your custom
datatype(s) with the id attribute set; in your custom tasks, add a an
attribute which would be a reference to your custom datatype
something like this :
<typedef name="mydata" class="com.foo.mydata"/>
<taskdef name="mytask" class="com.foo.mytask"/>
<taskdef name="mytask2" class="com.foo.mytask2"/>
<mydata property1="some.value" property2="some.othervalue" id="myid"/>
<mytask dataref="myid"/>
<mytask2 dataref="myid"/>
in the source code of ant, this type of mechanisms is used a lot; for
instance the javac task can accept a reference to the path datatype in
the attribute classpathref, ...
I have the impression that there are no explanations about custom
datatypes in the ant manual, this should exist.
Most of what has been written about custom tasks also is true of custom
datatypes, the only difference is that an execute() method is not needed
for a datatype.
Your custom datatypes may extend org.apache.tools.ant.types.DataType Source
code of org.apache.tools.ant.types.DataType
which probably makes coding more easy. It is probably also not an
absolute requirement.
Hopes this helps,
Antoine
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