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performance for get shards index #150

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performance for get shards index #150

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12 changes: 7 additions & 5 deletions store.go
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Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,7 @@ const numShards uint64 = 256
type shardedMap struct {
shards []*lockedMap
expiryMap *expirationMap
mask uint64
}

func newShardedMap() *shardedMap {
Expand All @@ -74,15 +75,16 @@ func newShardedMap() *shardedMap {
for i := range sm.shards {
sm.shards[i] = newLockedMap(sm.expiryMap)
}
sm.mask = numShards - 1
return sm
}

func (sm *shardedMap) Get(key, conflict uint64) (interface{}, bool) {
return sm.shards[key%numShards].get(key, conflict)
return sm.shards[key&sm.mask].get(key, conflict)
}

func (sm *shardedMap) Expiration(key uint64) time.Time {
return sm.shards[key%numShards].Expiration(key)
return sm.shards[key&sm.mask].Expiration(key)
}

func (sm *shardedMap) Set(i *item) {
Expand All @@ -91,15 +93,15 @@ func (sm *shardedMap) Set(i *item) {
return
}

sm.shards[i.key%numShards].Set(i)
sm.shards[i.key&sm.mask].Set(i)
}

func (sm *shardedMap) Del(key, conflict uint64) (uint64, interface{}) {
return sm.shards[key%numShards].Del(key, conflict)
return sm.shards[key&sm.mask].Del(key, conflict)
}

func (sm *shardedMap) Update(newItem *item) bool {
return sm.shards[newItem.key%numShards].Update(newItem)
return sm.shards[newItem.key&sm.mask].Update(newItem)
}

func (sm *shardedMap) Cleanup(policy policy, onEvict onEvictFunc) {
Expand Down