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https://issues.apache.org/jira/browse/TS-2712?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan M. Carroll closed TS-2712.
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Resolution: Not a Problem
> Add registration for transaction user args
> ------------------------------------------
>
> Key: TS-2712
> URL: https://issues.apache.org/jira/browse/TS-2712
> Project: Traffic Server
> Issue Type: Improvement
> Components: TS API
> Reporter: Alan M. Carroll
> Labels: spring-2014-summit, summit
> Fix For: 5.0.0
>
>
> Currently transaction args indices are used blindly because there is no way
> to coordinate between plugins on such use. We should add an API that
> allocates the transaction user arg indices for plugins.
> {code}
> int TSHttpTxnUserArgAllocate(char const* tag);
> {code}
> This would convert a string in to an index for the user args. If the string
> is already registered the same value would be returned as for previous calls
> with that string. If the string is not already registered a different value
> would be returned. If there are no more values available (i.e. the next value
> would be larger than the maximum user arg index) an error message would be
> generated and then the process terminated via ink_release_assert.
> As an implementation note we will use a global table of strings of the same
> length as the user args. The call would simply search the list and if it
> finds the tag, that index is returned, otherwise when it reaches an empty
> entry that is used for the tag and that index returned. If the search falls
> off the end that is the failure condition.
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