MEM_CacheLimiterC-Api.cpp

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#include <cstddef>

#include "MEM_CacheLimiter.h"
#include "MEM_CacheLimiterC-Api.h"

static intptr_t & get_max() 
{
        static intptr_t m = 32*1024*1024;
        return m;
}

void MEM_CacheLimiter_set_maximum(intptr_t m)
{
        get_max() = m;
}

intptr_t MEM_CacheLimiter_get_maximum()
{
        return get_max();
}

class MEM_CacheLimiterHandleCClass;
class MEM_CacheLimiterCClass;

typedef MEM_CacheLimiterHandle<MEM_CacheLimiterHandleCClass> handle_t;
typedef MEM_CacheLimiter<MEM_CacheLimiterHandleCClass> cache_t;
typedef std::list<MEM_CacheLimiterHandleCClass*,
                  MEM_Allocator<MEM_CacheLimiterHandleCClass* > > list_t;

class MEM_CacheLimiterCClass {
public:
        MEM_CacheLimiterCClass(MEM_CacheLimiter_Destruct_Func data_destructor_)
                : data_destructor(data_destructor_) { 
        }
        ~MEM_CacheLimiterCClass();
        
        handle_t * insert(void * data);

        void destruct(void * data,
                      list_t::iterator it);

        cache_t * get_cache() {
                return &cache;
        }
private:
        MEM_CacheLimiter_Destruct_Func data_destructor;

        MEM_CacheLimiter<MEM_CacheLimiterHandleCClass> cache;
        
        list_t cclass_list;
};

class MEM_CacheLimiterHandleCClass {
public:
        MEM_CacheLimiterHandleCClass(void * data_,
                                   MEM_CacheLimiterCClass * parent_)
                : data(data_), parent(parent_) { }
        ~MEM_CacheLimiterHandleCClass();
        void set_iter(list_t::iterator it_) {
                it = it_;
        }
        void set_data(void * data_) {
                data = data_;
        }
        void * get_data() const {
                return data;
        }
private:
        void * data;
        MEM_CacheLimiterCClass * parent;
        list_t::iterator it;
};

handle_t * MEM_CacheLimiterCClass::insert(void * data) 
{
        cclass_list.push_back(new MEM_CacheLimiterHandleCClass(data, this));
        list_t::iterator it = cclass_list.end();
        --it;
        cclass_list.back()->set_iter(it);
        
        return cache.insert(cclass_list.back());
}

void MEM_CacheLimiterCClass::destruct(void * data, list_t::iterator it) 
{
        data_destructor(data);
        cclass_list.erase(it);
}

MEM_CacheLimiterHandleCClass::~MEM_CacheLimiterHandleCClass()
{
        if (data) {
                parent->destruct(data, it);
        }
}

MEM_CacheLimiterCClass::~MEM_CacheLimiterCClass()
{
        // should not happen, but don't leak memory in this case...
        for (list_t::iterator it = cclass_list.begin();
             it != cclass_list.end(); it++) {
                (*it)->set_data(0);
                delete *it;
        }
}

// ----------------------------------------------------------------------

static inline MEM_CacheLimiterCClass* cast(MEM_CacheLimiterC * l)
{
        return (MEM_CacheLimiterCClass*) l;
}

static inline handle_t* cast(MEM_CacheLimiterHandleC * l)
{
        return (handle_t*) l;
}

MEM_CacheLimiterC * new_MEM_CacheLimiter(
        MEM_CacheLimiter_Destruct_Func data_destructor)
{
        return (MEM_CacheLimiterC*) new MEM_CacheLimiterCClass(
                data_destructor);
}

void delete_MEM_CacheLimiter(MEM_CacheLimiterC * This)
{
        delete cast(This);
}

MEM_CacheLimiterHandleC * MEM_CacheLimiter_insert(
        MEM_CacheLimiterC * This, void * data)
{
        return (MEM_CacheLimiterHandleC *) cast(This)->insert(data);
}

void MEM_CacheLimiter_enforce_limits(MEM_CacheLimiterC * This)
{
        cast(This)->get_cache()->enforce_limits();
}
        
void MEM_CacheLimiter_unmanage(MEM_CacheLimiterHandleC * handle)
{
        cast(handle)->unmanage();
}
        
void MEM_CacheLimiter_touch(MEM_CacheLimiterHandleC * handle)
{
        cast(handle)->touch();
}
        
void MEM_CacheLimiter_ref(MEM_CacheLimiterHandleC * handle)
{
        cast(handle)->ref();
}
        
void MEM_CacheLimiter_unref(MEM_CacheLimiterHandleC * handle)
{
        cast(handle)->unref();
}

int MEM_CacheLimiter_get_refcount(MEM_CacheLimiterHandleC * handle)
{
        return cast(handle)->get_refcount();
}

        
void * MEM_CacheLimiter_get(MEM_CacheLimiterHandleC * handle)
{
        return cast(handle)->get()->get_data();
}