[jira] [Updated] (TS-4523) Add the ability to pause/resume data consumption in the CPP API

["Alan M. Carroll (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TS-4523?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alan M. Carroll updated TS-4523:
--------------------------------
    Fix Version/s:     (was: 7.0.0)
                   7.1.0

> Add the ability to pause/resume data consumption in the CPP API
> ---------------------------------------------------------------
>
>                 Key: TS-4523
>                 URL: https://issues.apache.org/jira/browse/TS-4523
>             Project: Traffic Server
>          Issue Type: Improvement
>          Components: Plugins
>            Reporter: David Ben Zakai
>            Assignee: Uri Shachar
>             Fix For: 7.1.0
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> I'd like to suggest an API change in the CPP API Transformation interface.
> My own use case is that I'd like to be able to pause the transformation, handle what I can from the file and release the buffered content before resuming and releasing the rest of the data.
> Basically what I'm trying to achieve:
> Write data to file (up to a certain amount)
> File analysis
> Produce file data (and any leftovers) downstream
> When the file size reaches a certain size limit I'd like to be able to pause the transformation and produce all of its content downstream and then resume the transformation.
> API Changes:
> TransformationPlugin.h:
> /**
> * Call this method if you wish to pause the transformation.
> * Schedule the return value continuation to resume the transforamtion.
> * If the continuation is scheduled and called after the transform is destroyed it will 
> * won't do anything beyond cleanups.
> * Note: You must schedule the continuation or destroy it (using TSContDestroy) yourself, 
> * otherwise it will leak.
> */
> TSCont pause();
> Internally, the continuation wraps the "resumeCallback" static function:
> static int resumeCallback(TSCont cont, TSEvent event, void *edata); /** Resume callback*/
> Thank you!



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