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//! An app demonstrating the basics of the metrics front-end.
//! Defines metrics of each kind and use them to print values to the console in multiple ways.
extern crate dipstick;
use std::thread::sleep;
use std::io;
use std::time::Duration;
use dipstick::*;
fn main() {
// for this demo, print metric values to the console
let app_metrics = Stream::write_to(io::stdout()).input();
// metrics can be predefined by type and name
let counter = app_metrics.counter("counter_a");
let level = app_metrics.level("level_a");
let timer = app_metrics.timer("timer_b");
// metrics can also be declared and used ad-hoc (use output.cache() if this happens often)
app_metrics.counter("just_once").count(4);
// metric names can be prepended with a common prefix
let prefixed_metrics = app_metrics.add_prefix("subsystem");
let event = prefixed_metrics.marker("event_c");
let gauge = prefixed_metrics.gauge("gauge_d");
// each kind of metric has a different method name to prevent errors
counter.count(11);
level.adjust(-4);
level.adjust(5);
gauge.value(22);
gauge.value(-24);
event.mark();
// time can be measured multiple equivalent ways:
// in microseconds (used internally)
timer.interval_us(35573);
// using the time! macro
time!(timer, sleep(Duration::from_millis(5)));
// using a closure
timer.time(|| sleep(Duration::from_millis(5)));
// using a "time handle"
let start_time = timer.start();
Duration::from_millis(5);
timer.stop(start_time);
}