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trigger.go
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trigger.go
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package state
import (
"context"
)
type TriggerFunc func(ctx context.Context, name string, trigger *Trigger)
type Trigger struct {
// From is the state before the transition.
From uint32
// To is the state after the transition.
To uint32
// cancelFunc is called in case the event is canceled.
cancelFunc func()
// Err is an optional error that can be returned from a callback.
Err error
}
func newTrigger(fn context.CancelFunc) *Trigger {
return &Trigger{
cancelFunc: fn,
}
}
// Cancel can be called in before_<Trigger> or leave_<Trigger> to cancel the
// current transition before it happens. It takes an optional error, which will
// overwrite e.Err if set before.
func (t *Trigger) Cancel(err ...error) {
if t.cancelFunc != nil {
t.cancelFunc()
t.cancelFunc = nil
}
if len(err) > 0 {
t.Err = err[0]
}
}
// IsCanceled can be called in before_<Trigger> or leave_<Trigger> to cancel the
// current transition before it happens. It takes an optional error, which will
// overwrite e.Err if set before.
// @receiver *Trigger
// @return bool
func (t *Trigger) IsCanceled() bool {
return t.cancelFunc == nil
}
func (t *Trigger) key(name string) string {
return triggerKey{0, name}.String()
}
func (t *Trigger) stateKey(name string) string {
return triggerKey{t.To, name}.String()
}