open-consul/agent/consul/session_timers.go

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package consul
import (
"sync"
"time"
)
// SessionTimers provides a map of named timers which
// is safe for concurrent use.
type SessionTimers struct {
sync.RWMutex
m map[string]*time.Timer
}
func NewSessionTimers() *SessionTimers {
return &SessionTimers{m: make(map[string]*time.Timer)}
}
// Get returns the timer with the given id or nil.
func (t *SessionTimers) Get(id string) *time.Timer {
t.RLock()
defer t.RUnlock()
return t.m[id]
}
// Set stores the timer under given id. If tm is nil the timer
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// with the given id is removed.
func (t *SessionTimers) Set(id string, tm *time.Timer) {
t.Lock()
defer t.Unlock()
if tm == nil {
delete(t.m, id)
} else {
t.m[id] = tm
}
}
// Del removes the timer with the given id.
func (t *SessionTimers) Del(id string) {
t.Set(id, nil)
}
// Len returns the number of registered timers.
func (t *SessionTimers) Len() int {
t.RLock()
defer t.RUnlock()
return len(t.m)
}
// ResetOrCreate sets the ttl of the timer with the given id or creates a new
// one if it does not exist.
func (t *SessionTimers) ResetOrCreate(id string, ttl time.Duration, afterFunc func()) {
t.Lock()
defer t.Unlock()
if tm := t.m[id]; tm != nil {
tm.Reset(ttl)
return
}
t.m[id] = time.AfterFunc(ttl, afterFunc)
}
// Stop stops the timer with the given id and removes it.
func (t *SessionTimers) Stop(id string) {
t.Lock()
defer t.Unlock()
if tm := t.m[id]; tm != nil {
tm.Stop()
delete(t.m, id)
}
}
// StopAll stops and removes all registered timers.
func (t *SessionTimers) StopAll() {
t.Lock()
defer t.Unlock()
for _, tm := range t.m {
tm.Stop()
}
t.m = make(map[string]*time.Timer)
}