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From cestella <>
Subject [GitHub] metron pull request #606: METRON-980: Short circuit operations for Stellar
Date Fri, 02 Jun 2017 04:39:59 GMT
GitHub user cestella opened a pull request:

    METRON-980: Short circuit operations for Stellar

    ## Contributor Comments
    Stellar does not currently contain short circuit operations. In most languages, this is
an important optimization, but for Stellar on Metron, this is a requirement due to the fact
that some variables may be null legitimately and we cannot create multi-line conditionals
or temporary variables at the moment.
    The short circuit operations supported:
    * short circuited `or` (e.g. `true or FUNC(...)` would never execute `FUNC`)
    * short circuited `and` (e.g. `false and FUNC(...)` would never execute `FUNC`)
    * short circuited if/then/else (e.g. `if true then FUNC(...) else FUNC2(...)` will never
call `FUNC2`)
    This should be tested entirely via the unit tests for Stellar.  Please review the tests
and ensure I've not missed a test case, reviewers.
    ## Pull Request Checklist
    Thank you for submitting a contribution to Apache Metron.  
    Please refer to our [Development Guidelines](
for the complete guide to follow for contributions.  
    Please refer also to our [Build Verification Guidelines](
for complete smoke testing guides.  
    In order to streamline the review of the contribution we ask you follow these guidelines
and ask you to double check the following:
    ### For all changes:
    - [x] Is there a JIRA ticket associated with this PR? If not one needs to be created at
[Metron Jira](

    - [x] Does your PR title start with METRON-XXXX where XXXX is the JIRA number you are
trying to resolve? Pay particular attention to the hyphen "-" character.
    - [x] Has your PR been rebased against the latest commit within the target branch (typically
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    - [x] Have you included steps or a guide to how the change may be verified and tested
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      mvn -q clean integration-test install && build_utils/ 
    - [x] Have you written or updated unit tests and or integration tests to verify your changes?
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that is compatible for inclusion under [ASF 2.0](

    - [x] Have you verified the basic functionality of the build by building and running locally
with Vagrant full-dev environment or the equivalent?
    ### For documentation related changes:
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by building and verifying the site-book? If not then run the following commands and the verify
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    #### Note:
    Please ensure that once the PR is submitted, you check travis-ci for build issues and
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    It is also recommended that [travis-ci]( is set up for your personal
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You can merge this pull request into a Git repository by running:

    $ git pull short_circuit_stellar

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #606
commit c2a65b200c49a0ab748edf116f23a51b4811e66f
Author: cstella <>
Date:   2017-05-15T16:18:07Z

    Added test to verify shortcutting works.

commit 0c86c2a93216b9f0418e22b78de56c0facb6f55a
Author: cstella <>
Date:   2017-05-23T17:59:41Z

    Merge branch 'master' into short_circuit_stellar

commit d038f5c8738b11bba61d3f6cf07abf78b434f883
Author: cstella <>
Date:   2017-06-02T04:21:30Z

    Short circuit operations.

commit ac9ee328ba56296621a982d279a7c356d8a6d82c
Author: cstella <>
Date:   2017-06-02T04:21:54Z

    Merge branch 'master' into short_circuit_stellar

commit 7fe0e9b636e3fc6e7642af36de5d57261f6f3b78
Author: cstella <>
Date:   2017-06-02T04:31:46Z

    Updating some docs.


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