mirror of
https://github.com/Oxalide/vsphere-influxdb-go.git
synced 2023-10-10 13:36:51 +02:00
133 lines
2.9 KiB
Go
133 lines
2.9 KiB
Go
package stress
|
|
|
|
import (
|
|
"time"
|
|
)
|
|
|
|
// Timer is struct that can be used to track elaspsed time
|
|
type Timer struct {
|
|
start time.Time
|
|
end time.Time
|
|
}
|
|
|
|
// Start returns a Timers start field
|
|
func (t *Timer) Start() time.Time {
|
|
return t.start
|
|
}
|
|
|
|
// End returns a Timers end field
|
|
func (t *Timer) End() time.Time {
|
|
return t.end
|
|
}
|
|
|
|
// StartTimer sets a timers `start` field to the current time
|
|
func (t *Timer) StartTimer() {
|
|
t.start = time.Now()
|
|
}
|
|
|
|
// StopTimer sets a timers `end` field to the current time
|
|
func (t *Timer) StopTimer() {
|
|
t.end = time.Now()
|
|
}
|
|
|
|
// Elapsed returns the total elapsed time between the `start`
|
|
// and `end` fields on a timer.
|
|
func (t *Timer) Elapsed() time.Duration {
|
|
return t.end.Sub(t.start)
|
|
}
|
|
|
|
// NewTimer returns a pointer to a `Timer` struct where the
|
|
// timers `start` field has been set to `time.Now()`
|
|
func NewTimer() *Timer {
|
|
t := &Timer{}
|
|
t.StartTimer()
|
|
return t
|
|
}
|
|
|
|
// ResponseTime is a struct that contains `Value`
|
|
// `Time` pairing.
|
|
type ResponseTime struct {
|
|
Value int
|
|
Time time.Time
|
|
}
|
|
|
|
// NewResponseTime returns a new response time
|
|
// with value `v` and time `time.Now()`.
|
|
func NewResponseTime(v int) ResponseTime {
|
|
r := ResponseTime{Value: v, Time: time.Now()}
|
|
return r
|
|
}
|
|
|
|
// ResponseTimes is a slice of response times
|
|
type ResponseTimes []ResponseTime
|
|
|
|
// Implements the `Len` method for the
|
|
// sort.Interface type
|
|
func (rs ResponseTimes) Len() int {
|
|
return len(rs)
|
|
}
|
|
|
|
// Implements the `Less` method for the
|
|
// sort.Interface type
|
|
func (rs ResponseTimes) Less(i, j int) bool {
|
|
return rs[i].Value < rs[j].Value
|
|
}
|
|
|
|
// Implements the `Swap` method for the
|
|
// sort.Interface type
|
|
func (rs ResponseTimes) Swap(i, j int) {
|
|
rs[i], rs[j] = rs[j], rs[i]
|
|
}
|
|
|
|
//////////////////////////////////
|
|
|
|
// ConcurrencyLimiter is a go routine safe struct that can be used to
|
|
// ensure that no more than a specifid max number of goroutines are
|
|
// executing.
|
|
type ConcurrencyLimiter struct {
|
|
inc chan chan struct{}
|
|
dec chan struct{}
|
|
max int
|
|
count int
|
|
}
|
|
|
|
// NewConcurrencyLimiter returns a configured limiter that will
|
|
// ensure that calls to Increment will block if the max is hit.
|
|
func NewConcurrencyLimiter(max int) *ConcurrencyLimiter {
|
|
c := &ConcurrencyLimiter{
|
|
inc: make(chan chan struct{}),
|
|
dec: make(chan struct{}, max),
|
|
max: max,
|
|
}
|
|
go c.handleLimits()
|
|
return c
|
|
}
|
|
|
|
// Increment will increase the count of running goroutines by 1.
|
|
// if the number is currently at the max, the call to Increment
|
|
// will block until another goroutine decrements.
|
|
func (c *ConcurrencyLimiter) Increment() {
|
|
r := make(chan struct{})
|
|
c.inc <- r
|
|
<-r
|
|
}
|
|
|
|
// Decrement will reduce the count of running goroutines by 1
|
|
func (c *ConcurrencyLimiter) Decrement() {
|
|
c.dec <- struct{}{}
|
|
}
|
|
|
|
// handleLimits runs in a goroutine to manage the count of
|
|
// running goroutines.
|
|
func (c *ConcurrencyLimiter) handleLimits() {
|
|
for {
|
|
r := <-c.inc
|
|
if c.count >= c.max {
|
|
<-c.dec
|
|
c.count--
|
|
}
|
|
c.count++
|
|
r <- struct{}{}
|
|
}
|
|
}
|