56 lines
1.8 KiB
Go
56 lines
1.8 KiB
Go
// Copyright 2024 PingCAP, Inc.
|
|
//
|
|
// 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 task
|
|
|
|
var _ Scheduler = &SimpleTaskScheduler{}
|
|
|
|
// Scheduler is a scheduling interface defined for serializing(single thread)/concurrent(multi thread) running.
|
|
type Scheduler interface {
|
|
ExecuteTasks()
|
|
}
|
|
|
|
// SimpleTaskScheduler is defined for serializing scheduling of memo tasks.
|
|
type SimpleTaskScheduler struct {
|
|
Err error
|
|
SchedulerCtx SchedulerContext
|
|
}
|
|
|
|
// ExecuteTasks implements the interface of TaskScheduler.
|
|
func (s *SimpleTaskScheduler) ExecuteTasks() {
|
|
stack := s.SchedulerCtx.getStack()
|
|
defer func() {
|
|
// when step out of the scheduler, if the stack is empty, clean and release it.
|
|
if !stack.Empty() {
|
|
stack.Destroy()
|
|
}
|
|
}()
|
|
for !stack.Empty() {
|
|
// when use customized stack to drive the tasks, the call-chain state is dived in the stack.
|
|
task := stack.Pop()
|
|
if err := task.execute(); err != nil {
|
|
s.Err = err
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// SchedulerContext is defined for scheduling logic calling, also facilitate interface-oriented coding and testing.
|
|
type SchedulerContext interface {
|
|
// we exported the Stack interface here rather than the basic stack implementation.
|
|
getStack() Stack
|
|
// we exported the only one push action to user, Task is an interface definition.
|
|
pushTask(task Task)
|
|
}
|