| -rw-r--r-- | shared-code/LRUCache.h | 113 |
1 files changed, 0 insertions, 113 deletions
diff --git a/shared-code/LRUCache.h b/shared-code/LRUCache.h deleted file mode 100644 index 569e829..0000000 --- a/shared-code/LRUCache.h +++ b/dev/null @@ -1,113 +0,0 @@ -#ifndef __LRUCACHE_H
-#define __LRUCACHE_H
-
-namespace Klever {
-
-template<class IDX,class ARGIDX,class DATA>
-class CLRUCache : public CObject {
-public:
- struct CacheEntry {
- enum cacheState {
- cacheClean, cacheDirty, cacheEmpty
- };
- cacheState m_State;
- UINT m_hits;
-
- IDX m_idx;
- DATA* m_pData;
-
- CacheEntry() { m_State=cacheEmpty; VERIFY(m_pData=new DATA); m_hits=0; }
- virtual ~CacheEntry() { delete m_pData; }
- };
- typedef CMap<IDX,ARGIDX,CacheEntry*,CacheEntry*> CCacheMap;
- typedef CList<CacheEntry*,CacheEntry*> CCacheList;
-
- CCacheList m_Cache;
- CCacheMap m_Map;
-
- CLRUCache(UINT cacheSize) {
- for(int tmp=0;tmp<cacheSize;tmp++){
- CacheEntry* p = new CacheEntry;
- m_Cache.AddTail(p);
- }
- }
- virtual ~CLRUCache() {
- Flush();
- POSITION p = m_Cache.GetHeadPosition();
- while(p){
- CacheEntry* c = m_Cache.GetNext(p);
- delete c;
- }
- }
-
- DATA* GetCached(ARGIDX idx,BOOL bLoad=TRUE) {
- CacheEntry* rv;
- if(m_Map.Lookup(idx,rv)){
- rv->m_hits++;
- PopUp(rv);
- return rv->m_pData;
- }
- if(!bLoad)
- return NULL;
- rv = m_Cache.GetTail();
- ASSERT(rv);
- switch(rv->m_State){
- case CacheEntry::cacheDirty:
- FlushEntry(rv);
- case CacheEntry::cacheClean:
- m_Map.RemoveKey(rv->m_idx);
- rv->m_State=CacheEntry::cacheEmpty;
- case CacheEntry::cacheEmpty:
- break;
- default:
- ASSERT(FALSE);
- }
- if(!_ReadIn(idx,rv->m_pData))
- return NULL;
- rv->m_hits=1;
- rv->m_State=CacheEntry::cacheClean;
- rv->m_idx=idx;
- m_Map[idx]=rv;
- PopUp(rv);
- return rv->m_pData;
- }
- BOOL MakeDirty(ARGIDX idx) {
- CacheEntry* pEntry;
- if(m_Map.Lookup(idx,pEntry)){
- ASSERT(pEntry->m_State==CacheEntry::cacheClean || pEntry->m_State==CacheEntry::cacheDirty);
- pEntry->m_State=CacheEntry::cacheDirty;
- return TRUE;
- }
- return FALSE;
- }
- BOOL Flush() {
- POSITION p = m_Cache.GetHeadPosition();
- while(p){
- CacheEntry* pEntry = m_Cache.GetNext(p);
- ASSERT(pEntry);
- FlushEntry(pEntry);
- }
- return TRUE;
- }
- BOOL FlushEntry(CacheEntry* pEntry) {
- if(pEntry->m_State==CacheEntry::cacheDirty){
- BOOL rv = _WriteOut(pEntry->m_idx,pEntry->m_pData);
- if(rv)
- pEntry->m_State=CacheEntry::cacheClean;
- }
- return FALSE;
- }
- void PopUp(CacheEntry* pEntry) {
- POSITION p = m_Cache.Find(pEntry);
- ASSERT(p);
- m_Cache.RemoveAt(p);
- VERIFY(m_Cache.AddHead(pEntry));
- }
-
- virtual BOOL _ReadIn(ARGIDX idx,DATA* data) = 0;
- virtual BOOL _WriteOut(ARGIDX idx,DATA* data) = 0;
-};
-
-};
-
-#endif // __LRUCACHE_H
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