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package mix
import objectstore "codeberg.org/lindenii/furgit/object/store"
type backendNode struct {
backend objectstore.Reader
prev *backendNode
next *backendNode
}
//nolint:ireturn
func (mix *Mix) firstBackend() objectstore.Reader {
mix.mu.RLock()
defer mix.mu.RUnlock()
if mix.backendHead == nil {
return nil
}
return mix.backendHead.backend
}
//nolint:ireturn
func (mix *Mix) nextBackend(current objectstore.Reader) objectstore.Reader {
mix.mu.RLock()
defer mix.mu.RUnlock()
node := mix.backendNodeByStore[current]
if node == nil || node.next == nil {
return nil
}
return node.next.backend
}
func (mix *Mix) touchBackend(backend objectstore.Reader) {
if backend == nil {
return
}
if !mix.mu.TryLock() {
return
}
defer mix.mu.Unlock()
node := mix.backendNodeByStore[backend]
if node == nil || node == mix.backendHead {
return
}
if node.prev != nil {
node.prev.next = node.next
}
if node.next != nil {
node.next.prev = node.prev
}
if mix.backendTail == node {
mix.backendTail = node.prev
}
node.prev = nil
node.next = mix.backendHead
if mix.backendHead != nil {
mix.backendHead.prev = node
}
mix.backendHead = node
if mix.backendTail == nil {
mix.backendTail = node
}
}
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