78 lines
2.2 KiB
C++
78 lines
2.2 KiB
C++
/*
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*******************************************************************************
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* Copyright (C) 2013, International Business Machines Corporation and
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* others. All Rights Reserved.
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*******************************************************************************
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*
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* File LRUCACHE.H
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*******************************************************************************
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*/
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#ifndef __LRU_CACHE_H__
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#define __LRU_CACHE_H__
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#include "unicode/uobject.h"
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#include "sharedptr.h"
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struct UHashtable;
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U_NAMESPACE_BEGIN
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/**
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* LRUCache keyed by locale ID.
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*/
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class CacheEntry2;
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class U_COMMON_API LRUCache : public UObject {
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public:
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template<typename T>
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void get(const char *localeId, SharedPtr<T> &ptr, UErrorCode &status) {
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SharedPtr<UObject> p;
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_get(localeId, p, status);
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if (U_FAILURE(status)) {
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return;
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}
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ptr = p;
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}
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UBool contains(const char *localeId) const;
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virtual ~LRUCache();
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protected:
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virtual UObject *create(const char *localeId, UErrorCode &status)=0;
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LRUCache(int32_t maxSize, UErrorCode &status);
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private:
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LRUCache();
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LRUCache(const LRUCache &other);
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LRUCache &operator=(const LRUCache &other);
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UObject *safeCreate(const char *localeId, UErrorCode &status);
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CacheEntry2 *mostRecentlyUsedMarker;
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CacheEntry2 *leastRecentlyUsedMarker;
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UHashtable *localeIdToEntries;
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int32_t maxSize;
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void moveToMostRecent(CacheEntry2 *cacheEntry);
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UBool init(const char *localeId, CacheEntry2 *cacheEntry);
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void _get(const char *localeId, SharedPtr<UObject> &ptr, UErrorCode &status);
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};
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typedef UObject *(*CreateFunc)(const char *localeId, UErrorCode &status);
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class U_COMMON_API SimpleLRUCache : public LRUCache {
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public:
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SimpleLRUCache(
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int32_t maxSize,
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CreateFunc cf,
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UErrorCode &status) :
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LRUCache(maxSize, status), createFunc(cf) {
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}
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virtual ~SimpleLRUCache();
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protected:
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virtual UObject *create(const char *localeId, UErrorCode &status);
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private:
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CreateFunc createFunc;
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};
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U_NAMESPACE_END
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#endif
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