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#[cfg(feature = "statistics")]
mod inner {
use std::sync::atomic::{AtomicU64, Ordering};
use std::fmt;
static OPEN_CONNECTIONS: AtomicU64 = AtomicU64::new(0);
static QUERIES_PREPARING: AtomicU64 = AtomicU64::new(0);
static QUERIES_EXECUTING: AtomicU64 = AtomicU64::new(0);
static QUERIES_FETCHING: AtomicU64 = AtomicU64::new(0);
static QUERIES_DONE: AtomicU64 = AtomicU64::new(0);
static QUERIES_FAILED: AtomicU64 = AtomicU64::new(0);
pub(super) fn open_connections_inc () {
OPEN_CONNECTIONS.fetch_add(1, Ordering::Relaxed);
}
pub(super) fn open_connections_dec() {
assert!(OPEN_CONNECTIONS.fetch_sub(1, Ordering::Relaxed) > 0);
}
pub(super) fn queries_preparing_inc() {
QUERIES_PREPARING.fetch_add(1, Ordering::Relaxed);
}
pub(super) fn queries_preparing_dec() {
assert!(QUERIES_PREPARING.fetch_sub(1, Ordering::Relaxed) > 0);
}
pub(super) fn queries_executing_inc() {
QUERIES_EXECUTING.fetch_add(1, Ordering::Relaxed);
}
pub(super) fn queries_executing_dec() {
assert!(QUERIES_EXECUTING.fetch_sub(1, Ordering::Relaxed) > 0);
}
pub(super) fn queries_fetching_inc() {
QUERIES_FETCHING.fetch_add(1, Ordering::Relaxed);
}
pub(super) fn queries_fetching_dec() {
assert!(QUERIES_FETCHING.fetch_sub(1, Ordering::Relaxed) > 0);
}
pub(super) fn queries_done_inc() {
QUERIES_DONE.fetch_add(1, Ordering::Relaxed);
}
pub(super) fn queries_failed_inc() {
QUERIES_FAILED.fetch_add(1, Ordering::Relaxed);
}
#[derive(Debug)]
pub struct Statistics {
pub open_connections: u64,
pub queries_preparing: u64,
pub queries_executing: u64,
pub queries_fetching: u64,
pub queries_done: u64,
pub queries_failed: u64,
}
impl fmt::Display for Statistics {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "ODBC statistics: connections: open: {open_connections}, queries: preparing: {queries_preparing}, executing: {queries_executing}, fetching: {queries_fetching}, done: {queries_done}, failed: {queries_failed}",
open_connections = self.open_connections,
queries_preparing = self.queries_preparing,
queries_executing = self.queries_executing,
queries_fetching = self.queries_fetching,
queries_done = self.queries_done,
queries_failed = self.queries_failed,
)
}
}
pub fn statistics() -> Statistics {
Statistics {
open_connections: OPEN_CONNECTIONS.load(Ordering::Relaxed),
queries_preparing: QUERIES_PREPARING.load(Ordering::Relaxed),
queries_executing: QUERIES_EXECUTING.load(Ordering::Relaxed),
queries_fetching: QUERIES_FETCHING.load(Ordering::Relaxed),
queries_done: QUERIES_DONE.load(Ordering::Relaxed),
queries_failed: QUERIES_FAILED.load(Ordering::Relaxed),
}
}
}
#[cfg(feature = "statistics")]
pub use inner::statistics;
pub(crate) struct ConnectionOpenGuard;
impl ConnectionOpenGuard {
pub(crate) fn new() -> ConnectionOpenGuard {
#[cfg(feature = "statistics")]
inner::open_connections_inc();
ConnectionOpenGuard
}
}
impl Drop for ConnectionOpenGuard {
fn drop(&mut self) {
#[cfg(feature = "statistics")]
inner::open_connections_dec();
}
}
pub(crate) struct QueryPreparingGuard;
impl QueryPreparingGuard {
pub(crate) fn new() -> QueryPreparingGuard {
#[cfg(feature = "statistics")]
inner::queries_preparing_inc();
QueryPreparingGuard
}
}
impl Drop for QueryPreparingGuard {
fn drop(&mut self) {
#[cfg(feature = "statistics")]
inner::queries_preparing_dec();
}
}
struct QueryExecutingGuard;
impl QueryExecutingGuard {
fn new() -> QueryExecutingGuard {
#[cfg(feature = "statistics")]
inner::queries_executing_inc();
QueryExecutingGuard
}
fn failed(self) {
#[cfg(feature = "statistics")]
inner::queries_failed_inc();
}
fn fetching(self) -> QueryFetchingGuard {
QueryFetchingGuard::new()
}
}
#[cfg(feature = "statistics")]
impl Drop for QueryExecutingGuard {
fn drop(&mut self) {
#[cfg(feature = "statistics")]
inner::queries_executing_dec();
}
}
pub(crate) struct QueryFetchingGuard;
impl QueryFetchingGuard {
fn new() -> QueryFetchingGuard {
#[cfg(feature = "statistics")]
inner::queries_fetching_inc();
QueryFetchingGuard
}
}
#[cfg(feature = "statistics")]
impl Drop for QueryFetchingGuard {
fn drop(&mut self) {
inner::queries_fetching_dec();
inner::queries_done_inc();
}
}
pub(crate) fn query_preparing<O, F>(f: F) -> O where F: FnOnce() -> O {
let bind = QueryPreparingGuard::new();
let ret = f();
drop(bind);
ret
}
pub(crate) fn query_execution<O, E, F>(f: F) -> Result<(O, QueryFetchingGuard), E> where F: FnOnce() -> Result<O, E> {
let exec = QueryExecutingGuard::new();
match f() {
Ok(o) => {
Ok((o, exec.fetching()))
}
Err(e) => {
exec.failed();
Err(e)
}
}
}