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cron_facade.go
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/
cron_facade.go
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package cron
import (
"fmt"
"reflect"
"sync"
"time"
"github.com/robfig/cron/v3"
)
// cronFacade allows the client to operate using key rather than cron.EntryID,
// as well as providing sync guarantees
type cronFacade struct {
mu sync.Mutex
cron *cron.Cron
entryIDs map[string]cron.EntryID
}
type ScheduledTimeFunc func() time.Time
func newCronFacade() *cronFacade {
return &cronFacade{
cron: cron.New(),
entryIDs: make(map[string]cron.EntryID),
}
}
func (f *cronFacade) Start() {
f.cron.Start()
}
func (f *cronFacade) Stop() {
f.cron.Stop()
}
func (f *cronFacade) Delete(key string) {
f.mu.Lock()
defer f.mu.Unlock()
entryID, ok := f.entryIDs[key]
if !ok {
return
}
f.cron.Remove(entryID)
delete(f.entryIDs, key)
}
func (f *cronFacade) AddJob(key, schedule string, cwoc *cronWfOperationCtx) (ScheduledTimeFunc, error) {
f.mu.Lock()
defer f.mu.Unlock()
entryID, err := f.cron.AddJob(schedule, cwoc)
if err != nil {
return nil, err
}
f.entryIDs[key] = entryID
// Return a function to return the last scheduled time
return func() time.Time {
return f.cron.Entry(entryID).Prev
}, nil
}
func (f *cronFacade) Load(key string) (*cronWfOperationCtx, error) {
f.mu.Lock()
defer f.mu.Unlock()
entryID, ok := f.entryIDs[key]
if !ok {
return nil, fmt.Errorf("entry ID for %s not found", key)
}
entry := f.cron.Entry(entryID).Job
cwoc, ok := entry.(*cronWfOperationCtx)
if !ok {
return nil, fmt.Errorf("job entry ID for %s was not a *cronWfOperationCtx, was %v", key, reflect.TypeOf(entry))
}
return cwoc, nil
}