greenplumn CCacheFactory 源码
greenplumn CCacheFactory 代码
文件路径：/src/backend/gporca/libgpos/include/gpos/memory/CCacheFactory.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC CORP.
//
// @filename:
// CCache.h
//
// @doc:
// Definition of cache factory class.
//.
// @owner:
//
// @test:
//
//---------------------------------------------------------------------------
#ifndef CCACHEFACTORY_H_
#define CCACHEFACTORY_H_
#include "gpos/base.h"
#include "gpos/memory/CAutoMemoryPool.h"
#include "gpos/memory/CCache.h"
// default initial value of the gclock counter during insertion of an entry
#define CCACHE_GCLOCK_INIT_COUNTER 3
using namespace gpos;
namespace gpos
{
//---------------------------------------------------------------------------
// @class:
// CCacheFactory
//
// @doc:
// Definition of cache factory;
//
// This class is responsible of creating cache objects and allocating the
// memory pools they need
//
//---------------------------------------------------------------------------
class CCacheFactory
{
private:
// global instance
static CCacheFactory *m_factory;
// memory pool allocated to caches
CMemoryPool *m_mp;
// private ctor
CCacheFactory(CMemoryPool *mp);
public:
CCacheFactory(const CCacheFactory &) = delete;
// private dtor
~CCacheFactory()
{
GPOS_ASSERT(nullptr == m_factory &&
"Cache factory has not been shut down");
}
// initialize global memory pool
static GPOS_RESULT Init();
// destroy global instance
static void Shutdown();
// global accessor
inline static CCacheFactory *
GetFactory()
{
return m_factory;
}
// create a cache instance
template <class T, class K>
static CCache<T, K> *
CreateCache(BOOL unique, ULLONG cache_quota,
typename CCache<T, K>::HashFuncPtr hash_func,
typename CCache<T, K>::EqualFuncPtr equal_func)
{
GPOS_ASSERT(nullptr != GetFactory() &&
"Cache factory has not been initialized");
CMemoryPool *mp = GetFactory()->Pmp();
CCache<T, K> *cache = GPOS_NEW(mp)
CCache<T, K>(mp, unique, cache_quota, CCACHE_GCLOCK_INIT_COUNTER,
hash_func, equal_func);
return cache;
}
CMemoryPool *Pmp() const;
}; // CCacheFactory
} // namespace gpos
#endif // CCACHEFACTORY_H_
// EOF
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