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timer.go
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timer.go
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// Copyright (c) nano Authors. All Rights Reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package scheduler
import (
"math"
"runtime/debug"
"sync"
"sync/atomic"
"time"
"github.com/aura-studio/nano/log"
)
const (
infinite = -1
)
var (
// timerManager manager for all timers
timerManager = &struct {
incrementID int64 // auto increment id
timers map[int64]*Timer // all timers
muClosingTimer sync.RWMutex
closingTimer []int64
muCreatedTimer sync.RWMutex
createdTimer []*Timer
}{}
)
type (
// TimerFunc represents a function which will be called periodically in main
// logic gorontine.
TimerFunc func()
// TimerCondition represents a checker that returns true when cron job needs
// to execute
TimerCondition interface {
Check(now time.Time) bool
}
// Timer represents a cron job
Timer struct {
id int64 // timer id
fn TimerFunc // function that execute
createAt int64 // timer create time
interval time.Duration // execution interval
condition TimerCondition // condition to cron job execution
elapse int64 // total elapse time
closed int32 // is timer closed
counter int // counter
}
)
func init() {
timerManager.timers = map[int64]*Timer{}
}
// ID returns id of current timer
func (t *Timer) ID() int64 {
return t.id
}
// Stop turns off a timer. After Stop, fn will not be called forever
func (t *Timer) Stop() {
if atomic.AddInt32(&t.closed, 1) != 1 {
return
}
t.counter = 0
}
// execute job function with protection
func safecall(id int64, fn TimerFunc) {
defer func() {
if err := recover(); err != nil {
log.Errorf("Handle timer panic: %+v\n%s", err, debug.Stack())
}
}()
fn()
}
func cron() {
if len(timerManager.createdTimer) > 0 {
timerManager.muCreatedTimer.Lock()
for _, t := range timerManager.createdTimer {
timerManager.timers[t.id] = t
}
timerManager.createdTimer = timerManager.createdTimer[:0]
timerManager.muCreatedTimer.Unlock()
}
if len(timerManager.timers) < 1 {
return
}
now := time.Now()
unn := now.UnixNano()
for id, t := range timerManager.timers {
if t.counter == infinite || t.counter > 0 {
// condition timer
if t.condition != nil {
if t.condition.Check(now) {
safecall(id, t.fn)
}
continue
}
// execute job
if t.createAt+t.elapse <= unn {
safecall(id, t.fn)
t.elapse += int64(t.interval)
// update timer counter
if t.counter != infinite && t.counter > 0 {
t.counter--
}
}
}
if t.counter == 0 {
timerManager.muClosingTimer.Lock()
timerManager.closingTimer = append(timerManager.closingTimer, t.id)
timerManager.muClosingTimer.Unlock()
continue
}
}
if len(timerManager.closingTimer) > 0 {
timerManager.muClosingTimer.Lock()
for _, id := range timerManager.closingTimer {
delete(timerManager.timers, id)
}
timerManager.closingTimer = timerManager.closingTimer[:0]
timerManager.muClosingTimer.Unlock()
}
}
// NewTimer returns a new Timer containing a function that will be called
// with a period specified by the duration argument. It adjusts the intervals
// for slow receivers.
// The duration d must be greater than zero; if not, NewTimer will panic.
// Stop the timer to release associated resources.
func NewTimer(interval time.Duration, fn TimerFunc) *Timer {
return NewCountTimer(interval, infinite, fn)
}
// NewCountTimer returns a new Timer containing a function that will be called
// with a period specified by the duration argument. After count times, timer
// will be stopped automatically, It adjusts the intervals for slow receivers.
// The duration d must be greater than zero; if not, NewCountTimer will panic.
// Stop the timer to release associated resources.
func NewCountTimer(interval time.Duration, count int, fn TimerFunc) *Timer {
if fn == nil {
panic("nano/timer: nil timer function")
}
if interval <= 0 {
panic("non-positive interval for NewTimer")
}
t := &Timer{
id: atomic.AddInt64(&timerManager.incrementID, 1),
fn: fn,
createAt: time.Now().UnixNano(),
interval: interval,
elapse: int64(interval), // first execution will be after interval
counter: count,
}
timerManager.muCreatedTimer.Lock()
timerManager.createdTimer = append(timerManager.createdTimer, t)
timerManager.muCreatedTimer.Unlock()
return t
}
// NewAfterTimer returns a new Timer containing a function that will be called
// after duration that specified by the duration argument.
// The duration d must be greater than zero; if not, NewAfterTimer will panic.
// Stop the timer to release associated resources.
func NewAfterTimer(duration time.Duration, fn TimerFunc) *Timer {
return NewCountTimer(duration, 1, fn)
}
// NewCondTimer returns a new Timer containing a function that will be called
// when condition satisfied that specified by the condition argument.
// The duration d must be greater than zero; if not, NewCondTimer will panic.
// Stop the timer to release associated resources.
func NewCondTimer(condition TimerCondition, fn TimerFunc) *Timer {
if condition == nil {
panic("nano/timer: nil condition")
}
t := NewCountTimer(time.Duration(math.MaxInt64), infinite, fn)
t.condition = condition
return t
}