108 lines
2.3 KiB
Go
108 lines
2.3 KiB
Go
package jobmgr
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import (
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"context"
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"errors"
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"gitlink.org.cn/cloudream/common/pkgs/logger"
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"sync"
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"gitlink.org.cn/cloudream/common/pkgs/future"
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"gitlink.org.cn/cloudream/common/utils/lo2"
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)
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type EventWaitCondition func(evt Event) bool
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var ErrJobCancelled = errors.New("job cancelled")
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type Event interface {
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Noop()
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}
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type EventWaiter struct {
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condition EventWaitCondition
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future *future.SetValueFuture[Event]
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}
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type EventSet struct {
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events []Event
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waiters []EventWaiter
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lock sync.Mutex
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}
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func NewEventSet() EventSet {
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return EventSet{}
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}
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func (s *EventSet) Post(evt Event) {
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s.lock.Lock() // 加锁保护事件集合
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defer s.lock.Unlock() // 确保在函数结束时释放锁
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// 遍历等待者列表，查找匹配的等待者。如果找到，从列表中移除，并设置其future的值。
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used := false // 标记当前事件是否已被使用（即是否唤醒了某个等待者）
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for i, waiter := range s.waiters {
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if waiter.condition(evt) { // 检查当前事件是否满足等待条件
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s.waiters = lo2.RemoveAt(s.waiters, i) // 从等待者列表中移除当前等待者
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waiter.future.SetValue(evt) // 设置等待者的future值为当前事件
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used = true // 标记事件已被使用
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}
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}
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// 如果没有匹配的等待者，则将事件添加到事件列表中。
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if !used {
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s.events = append(s.events, evt)
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}
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}
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func (s *EventSet) Wait(ctx context.Context, cond EventWaitCondition) (Event, bool) {
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s.lock.Lock()
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for i, evt := range s.events {
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if cond(evt) {
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s.events = lo2.RemoveAt(s.events, i)
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s.lock.Unlock()
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return evt, true
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}
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}
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fut := future.NewSetValue[Event]()
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waiter := EventWaiter{
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condition: cond,
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future: fut,
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}
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s.waiters = append(s.waiters, waiter)
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logger.Info("append waiter: %p", &waiter)
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s.lock.Unlock()
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val, err := fut.Wait(ctx)
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if err != nil {
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return nil, false
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}
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return val, true
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}
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func (s *EventSet) BeginWait(cond EventWaitCondition) future.Future1[Event] {
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s.lock.Lock()
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for i, evt := range s.events {
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if cond(evt) {
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s.events = lo2.RemoveAt(s.events, i)
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s.lock.Unlock()
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return future.NewReadyValue1(evt)
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}
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}
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fut := future.NewSetValue[Event]()
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waiter := EventWaiter{
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condition: cond,
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future: fut,
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}
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s.waiters = append(s.waiters, waiter)
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s.lock.Unlock()
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return fut
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}
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