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From: Otto Fowler <ottobackwards@gmail.com>
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Date: Wed, 3 Jan 2018 21:10:52 +0100
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Subject: Re: Hello and possible addition
To: Benedikt Ritter <britter@apache.org>, Commons Developers List <dev@commons.apache.org>
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archived-at: Wed, 03 Jan 2018 20:10:59 -0000

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https://github.com/apache/commons-lang/pull/311


On January 3, 2018 at 09:05:37, Benedikt Ritter (britter@apache.org) wrote:


> Am 03.01.2018 um 15:02 schrieb Otto Fowler <ottobackwards@gmail.com>:
>
> Just to check, Java 7 is the required language level?

Yes

>
>
> On January 3, 2018 at 07:12:03, Otto Fowler (ottobackwards@gmail.com)
wrote:
>
> While working on adding some timing functionality to a Metron feature, I
> came across the
> Stopwatch
> <
https://commons.apache.org/proper/commons-lang/javadocs/api-release/org/apa=
che/commons/lang3/time/StopWatch.html>

> class, but found that it didn=E2=80=99t suite my needs.
>
> What I wanted to do was to create a timing from a top level function in
our
> Stellar
> <
https://github.com/apache/metron/tree/master/metron-stellar/stellar-common>
> dsl, and have have a group of related timings, such that the end result
> was the overall time of the call, and nested timings of other calls
> executed during the dsl execution of that function. These timings would
all
> be named, and have a path for identification and include timing the
> language compiler/execution as well as the function execution itself. It
> would be helpful if they were tagged in some way as well, such that the
> consumer could filter during visitation.
>
> So I have written StackWatch <https://github.com/ottobackwards/StackWatch=
>
to
> provide this functionality, and submitted it in a Metron PR
> <https://github.com/apache/metron/pull/873>.
>
> From the PR description:
> StackWatch
>
> A set of utility classes under the new package stellar.common.timing have
> been added. These provide the StackWatch functionality.
>
> StackWatch provides an abstraction over the Apache Commons StopWatch
class
> that allows callers to create multiple named and possibly nested timing
> operations.
>
> <=E2=80=A6>
>
> This class may be more generally useful to this and other projects, but I
> am not sure where it would live since we wouldn=E2=80=99t want it in comm=
on.
>
> StackWatch uses a combination of Deque and a custom Tree implementation
to
> create, start and end timing operations.
>
> A Visitor pattern is also implemented to allow for retrieving the results
> after the completion of the operation.
>
> See the StackWatch tests for examples of nested function timings.
> ------------------------------
>
> A quick look at the PR and it=E2=80=99s test or the github project ( they=
 are in
> sync ) should show the idea.
>
> I am sending this to see if this functionality would be appropriate for
> commons in some way. If so, the I can create the jira and submit the pr.
> Even if it is not appropriate, any feedback or pr=E2=80=99s on the github=
 project
> would still be most welcome.
>
> Thanks for all the work that has made commons so valuable to other Apache
> projects and java developers in general!


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