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Feat: Started implementing cached ads map #2524
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| package ads | ||
|
|
||
| import ( | ||
| "sync" | ||
|
|
||
| lru "github.com/hashicorp/golang-lru/v2" | ||
| "github.com/iotaledger/hive.go/core/generics/constraints" | ||
| "github.com/iotaledger/hive.go/core/generics/lo" | ||
| "github.com/iotaledger/hive.go/core/generics/shrinkingmap" | ||
| "github.com/iotaledger/hive.go/core/kvstore" | ||
| "github.com/iotaledger/hive.go/core/typeutils" | ||
| ) | ||
|
|
||
| type CachedMap[K, V constraints.Serializable, KPtr constraints.MarshalablePtr[K], VPtr constraints.MarshalablePtr[V]] struct { | ||
| storedMap *Map[K, V, KPtr, VPtr] | ||
|
|
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| writeCache *shrinkingmap.ShrinkingMap[string, VPtr] | ||
| readCache *lru.Cache[string, VPtr] | ||
|
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| mutex sync.Mutex | ||
| newElements *sync.Cond | ||
| writeCacheEmpty *sync.Cond | ||
| } | ||
|
|
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| func NewCachedMap[K, V constraints.Serializable, KPtr constraints.MarshalablePtr[K], VPtr constraints.MarshalablePtr[V]](store kvstore.KVStore, cacheSize int) (newMap *CachedMap[K, V, KPtr, VPtr]) { | ||
| newMap = &CachedMap[K, V, KPtr, VPtr]{ | ||
| storedMap: NewMap[K, V, KPtr, VPtr](store), | ||
| writeCache: shrinkingmap.New[string, VPtr](), | ||
| readCache: lo.PanicOnErr(lru.New[string, VPtr](cacheSize)), | ||
| } | ||
|
|
||
| newMap.newElements = &sync.Cond{ | ||
| L: &newMap.mutex, | ||
| } | ||
|
|
||
| newMap.writeCacheEmpty = &sync.Cond{ | ||
| L: &newMap.mutex, | ||
| } | ||
|
|
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| go newMap.writeLoop() | ||
|
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| return | ||
| } | ||
|
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| func (c *CachedMap[K, V, KPtr, VPtr]) Set(key K, value VPtr) { | ||
| keyString := typeutils.BytesToString(lo.PanicOnErr(key.Bytes())) | ||
|
|
||
| c.mutex.Lock() | ||
| defer c.mutex.Unlock() | ||
|
|
||
| if c.writeCache.Set(keyString, value) && c.writeCache.Size() == 1 { | ||
| c.newElements.Signal() | ||
| } | ||
|
|
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| c.readCache.Remove(keyString) | ||
| } | ||
|
|
||
| func (c *CachedMap[K, V, KPtr, VPtr]) Delete(key K) { | ||
| keyString := typeutils.BytesToString(lo.PanicOnErr(key.Bytes())) | ||
|
|
||
| c.mutex.Lock() | ||
| defer c.mutex.Unlock() | ||
|
|
||
| c.writeCache.Set(keyString, nil) | ||
| c.readCache.Remove(keyString) | ||
| } | ||
|
|
||
| func (c *CachedMap[K, V, KPtr, VPtr]) Has(key K) (has bool) { | ||
| return lo.Return1(c.Get(key)) != nil | ||
| } | ||
|
|
||
| func (c *CachedMap[K, V, KPtr, VPtr]) Get(key K) (value VPtr, exists bool) { | ||
| keyBytes := lo.PanicOnErr(key.Bytes()) | ||
| keyString := typeutils.BytesToString(keyBytes) | ||
|
|
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| c.mutex.Lock() | ||
| defer c.mutex.Unlock() | ||
|
|
||
| if writtenValue, writtenValueExists := c.writeCache.Get(keyString); writtenValueExists { | ||
| return writtenValue, writtenValue != nil | ||
| } | ||
|
|
||
| if readValue, readValueExists := c.readCache.Get(keyString); readValueExists { | ||
| return readValue, readValue != nil | ||
| } | ||
|
|
||
| value, exists = c.storedMap.Get(key) | ||
| c.readCache.Add(keyString, value) | ||
|
|
||
| return | ||
| } | ||
|
|
||
| func (c *CachedMap[K, V, KPtr, VPtr]) writeLoop() { | ||
| for { | ||
| c.mutex.Lock() | ||
| for c.writeCache.Size() == 0 { | ||
| c.writeCacheEmpty.Broadcast() | ||
|
|
||
| c.newElements.Wait() | ||
| } | ||
|
|
||
| keyToWrite, valueToWrite, exists := c.writeCache.Pop() | ||
| if !exists { | ||
| panic("writeCache should not be empty") | ||
| } | ||
|
|
||
| c.readCache.Add(keyToWrite, valueToWrite) | ||
| c.mutex.Unlock() | ||
|
|
||
| if valueToWrite == nil { | ||
| c.storedMap.delete(typeutils.StringToBytes(keyToWrite)) | ||
| } else { | ||
| c.storedMap.set(typeutils.StringToBytes(keyToWrite), lo.PanicOnErr(valueToWrite.Bytes())) | ||
| } | ||
| } | ||
| } | ||
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This loop needs a way to be exited for cleanup