Trait QueryStatsProvider 

pub trait QueryStatsProvider: Send + Sync {
    // Required methods
    fn before_query(&self, sql: &str) -> Box<dyn Any + Send>;
    fn after_query(
        &self,
        token: Box<dyn Any + Send>,
        sql: &str,
    ) -> Option<QueryStats>;
}

Trait for collecting query statistics from a Hyper server.

Implementations capture stats using different mechanisms (log file parsing, future native protocol support, etc.). The trait uses an opaque token pattern: before_query is called before execution and returns a token (e.g., a file offset), which is passed to after_query after execution to extract the stats.

Thread Safety

Providers must be Send + Sync since they may be shared across connections.

Required Methods

fn before_query(&self, sql: &str) -> Box<dyn Any + Send>

Called before a query is executed.

Returns an opaque token that will be passed to after_query. For the log-based provider, this is the current file offset.

fn after_query( &self, token: Box<dyn Any + Send>, sql: &str, ) -> Option<QueryStats>

Called after a query completes.

Uses the token from before_query to locate and extract the query statistics. Returns None if stats could not be found.

Trait Implementations

impl Debug for dyn QueryStatsProvider

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl QueryStatsProvider for LogFileStatsProvider