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internal/core/cache.go
554bcfc63721b22faf8bca78d5518d76e24a4d20
· 1.2 KB · 61 lines
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| 1 | package core |
| 2 | |
| 3 | import ( |
| 4 | "container/list" |
| 5 | "sync" |
| 6 | ) |
| 7 | |
| 8 | // LRU is a bounded cache of module results keyed on immutable commit SHAs. |
| 9 | // Bounded by entry COUNT, not bytes -- a diff of a huge commit and a ref |
| 10 | // list cost the same one slot. If that bites, swap in a size-aware cache; |
| 11 | // the Store interface is the only thing that has to hold. |
| 12 | type LRU struct { |
| 13 | mu sync.Mutex |
| 14 | max int |
| 15 | ll *list.List |
| 16 | items map[string]*list.Element |
| 17 | } |
| 18 | |
| 19 | type lruEntry struct { |
| 20 | key string |
| 21 | val any |
| 22 | } |
| 23 | |
| 24 | func NewLRU(max int) *LRU { |
| 25 | if max <= 0 { |
| 26 | max = 2048 |
| 27 | } |
| 28 | return &LRU{max: max, ll: list.New(), items: map[string]*list.Element{}} |
| 29 | } |
| 30 | |
| 31 | func (c *LRU) Get(key string) (any, bool) { |
| 32 | c.mu.Lock() |
| 33 | defer c.mu.Unlock() |
| 34 | if el, ok := c.items[key]; ok { |
| 35 | c.ll.MoveToFront(el) |
| 36 | return el.Value.(*lruEntry).val, true |
| 37 | } |
| 38 | return nil, false |
| 39 | } |
| 40 | |
| 41 | func (c *LRU) Put(key string, val any) { |
| 42 | c.mu.Lock() |
| 43 | defer c.mu.Unlock() |
| 44 | if el, ok := c.items[key]; ok { |
| 45 | c.ll.MoveToFront(el) |
| 46 | el.Value.(*lruEntry).val = val |
| 47 | return |
| 48 | } |
| 49 | c.items[key] = c.ll.PushFront(&lruEntry{key, val}) |
| 50 | for c.ll.Len() > c.max { |
| 51 | old := c.ll.Back() |
| 52 | c.ll.Remove(old) |
| 53 | delete(c.items, old.Value.(*lruEntry).key) |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | func (c *LRU) Len() int { |
| 58 | c.mu.Lock() |
| 59 | defer c.mu.Unlock() |
| 60 | return c.ll.Len() |
| 61 | } |