counters
A GoLang implementation of counters.
It provides an object: counters.CounterBox and Counter, Min and Max implementation.
Installation:
$ go get -u github.com/orian/counters
The example usages:
import "github.com/orian/counters"
//... some code
cb := counters.NewCounterBox()
c := cb.GetCounter("ex")
c.Increment()
c.IncrementBy(6)
c.Value() // returns 7
cb.GetCounter("ex").Value() // Returns 7
For convenience there is also an http.HandleFunc provided which prints values of counters.
One may use subpackage globals if want to use a global counters.
import "github.com/orian/counters/global"
//... some code
c := global.GetCounter("ex")
c.Increment()
c.IncrementBy(6)
c.Value() // returns 7
global.GetCounter("ex").Value() // Returns 7
The library and all objects are thread safe.
Print into log or stdout on SIGINT
Please check the example/example.go to see how the interrupt can be handled in a nice way.
Performance and benchmarks
The library has two benchmarks. It's blazingly fast. One should cache counters which are used often. Every time the counter is requested, it's necessary to look up in map for a counter, this slows down the lib by a factor of 4.
$ go test --bench=. .
PASS
BenchmarkCounters 1000000 1287 ns/op
BenchmarkCountersCached 5000000 252 ns/op
ok github.com/orian/counters 2.822s