Refactor the original db code.

object/syncer_cron.go

@@ -0,0 +1,40 @@
+// Copyright 2021 The casbin Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package object
+
+import "github.com/mileusna/crontab"
+
+var cronMap map[string]*crontab.Crontab
+
+func init() {
+	cronMap = map[string]*crontab.Crontab{}
+}
+
+func getCrontab(name string) *crontab.Crontab {
+	ctab, ok := cronMap[name]
+	if !ok {
+		ctab = crontab.New()
+		cronMap[name] = ctab
+	}
+	return ctab
+}
+
+func clearCrontab(name string) {
+	ctab, ok := cronMap[name]
+	if ok {
+		ctab.Clear()
+		delete(cronMap, name)
+	}
+}