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object_locks.go
48 lines (41 loc) · 903 Bytes
/
object_locks.go
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package kreconciler
import (
"errors"
"sync"
)
// used to avoid having the same object multiple times in the queue
type objectLocks struct {
m sync.Mutex
capacity int
objects map[string]bool
}
var errAlreadyPresent = errors.New("item already present")
var errQueueOverflow = errors.New("queue is at capacity")
func newObjectLocks(capacity int) objectLocks {
return objectLocks{
capacity: capacity,
objects: make(map[string]bool, capacity),
}
}
func (o *objectLocks) Take(id string) error {
o.m.Lock()
defer o.m.Unlock()
if len(o.objects) == o.capacity {
return errQueueOverflow
}
if _, ok := o.objects[id]; !ok {
o.objects[id] = true
return nil
}
return errAlreadyPresent
}
func (o *objectLocks) Free(id string) {
o.m.Lock()
defer o.m.Unlock()
delete(o.objects, id)
}
func (o *objectLocks) Size() int {
o.m.Lock()
defer o.m.Unlock()
return len(o.objects)
}