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Re: Task Optimization

by hdockter :: Rate this Message:

On Jun 24, 2009, at 10:42 PM, Steve Appling wrote:

>
>
> Hans Dockter wrote:
>> <snip>
>>> 4) I would like to be able to specify that a chain of dependent
>>> tasks only execute a task if Task.didWork is true for all of its
>>> dependents.
>> I don't fully understand this. Could you explain this a bit more?
>> <snip>
>> - Hans
>
> Sure - I did not express that very well at all. I also wrote it
> before I attempted an implementation, so I think I have a better
> idea of what might be needed now.
>
> In the syntax that I implemented, you could say:
> test.onlyIf { isNeeded() }
>
> I wanted this to be able to look at the TaskDependencies for the
> test task and only execute if Task.didWork was true for one of them.
> I was not able to figure out how to use TaskDependencies to
> accomplish this. task.getTaskDependencies(task) only returns the
> tasks that are explicitly added using dependsOn and doesn't seem to
> take into account the tasks needed to build the artifacts in the
> configurations that are contained in the TaskDependencies object.

At the moment our task execution graph does not provide this
information nor does it have a data model for this. What should be
straight forward to do is to add a method to the execution graph that
computes this on the fly for a certain task.

>
> In this case (a Test task), I would like the isNeeded method to
> return true if either compile or compileTests didWork() is true or
> if any of the tasks needed to build artifacts in the testRuntime
> configuration didWork() was true. Currently it does not check the
> tasks that might be derived from the configuration.

It is similar to the idea of smart exclusion except that this needs to
be done at execution time.

>
> I was hoping that a general purpose isNeeded helper could do this
> for all tasks in the same way, but it is possible that certain
> subclasses of Task just need their own specific implementations.

Right.

- Hans

--
Hans Dockter
Gradle Project Manager
http://www.gradle.org

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