[jira] [Assigned] (TS-3881) new TS API TSHttpTxnCacheStateGet

["Sudheer Vinukonda (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TS-3881?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sudheer Vinukonda reassigned TS-3881:
-------------------------------------

    Assignee: Sudheer Vinukonda

> new TS API TSHttpTxnCacheStateGet
> ---------------------------------
>
>                 Key: TS-3881
>                 URL: https://issues.apache.org/jira/browse/TS-3881
>             Project: Traffic Server
>          Issue Type: New Feature
>          Components: TS API
>            Reporter: Sudheer Vinukonda
>            Assignee: Sudheer Vinukonda
>
> I'd like to add a new API TSHttpTxnCacheStateGet() to be able to get more insight into cache operations (e.g read_while_write, open read tries, open write tries, cache volume used etc) on a given Txn. 
> Below's the proposal with the info I'd like the new API return along with the API signature.
> Please provide comments/suggestions.
> {code}
> +typedef enum {
> +  TS_CACHE_TXN_STATE_HIT_RAM,
> +  TS_CACHE_TXN_STATE_READ_WHILE_WRITER,
> +  TS_CACHE_TXN_STATE_OPEN_READ_TRIES,
> +  TS_CACHE_TXN_STATE_OPEN_WRITE_TRIES,
> +  TS_CACHE_TXN_STATE_CACHE_VOLUME,
> +  TS_CACHE_TXN_STATE_LAST_ENTRY
> +} TSCacheTxnStateKey;
> +
> +/* Get Cache Lookup state, useful for understanding how a lookup was performed */
> +/**
> +   Return the particular cache lookup info requested.
> +
> +   @param txnp the transaction pointer
> +   @param key the requested cache lookup info.
> +   @param TSMgmtInt a pointer to a integer where we will store the metric value
> +
> +   @return @c TS_SUCCESS if the metric is supported, TS_ERROR otherwise
> +
> +*/
> +tsapi TSReturnCode TSHttpTxnCacheStateGet(TSHttpTxn txnp, TSCacheStateKey key, TSMgmtInt *value);
> {code}
> +



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