hvirtual/cinelerra/cachebase.h

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#ifndef CACHEBASE_H
#define CACHEBASE_H


#include "asset.inc"
#include "linklist.h"
#include "mutex.inc"
#include <stdint.h>


// Store rendered elements from files but not the files.
// Drawing caches must be separate from file caches to avoid
// delaying other file accesses for the drawing routines.


class CacheItemBase : public ListItem<CacheItemBase>
{
public:
        CacheItemBase();
        virtual ~CacheItemBase();



        virtual int get_size();

// asset_id - supplied by user if the cache is not part of a file.
// Used for fast accesses.
        int asset_id;
// path is needed since the item may need to be deleted based on file.
// Used for deletion.
        char *path;
// Number of last get or put operation involving this object.
        int age;
// Starting point of item in asset's native rate.
        int64_t position;
};



class CacheBase : public List<CacheItemBase>
{
public:
        CacheBase();
        virtual ~CacheBase();

        int get_age();

        void remove_all();

// Remove all items with the asset id.
        void remove_asset(Asset *asset);

// Insert item in list in ascending position order.
        void put_item(CacheItemBase *item);

// Get first item from list with matching position or 0 if none found.
        CacheItemBase* get_item(int64_t position);

// Called when done with the item returned by get_.
// Ignore if item was 0.
        void unlock();

// Get ID of oldest member.
// Called by MWindow::age_caches.
        int get_oldest();

// Delete oldest item.  Return 0 if successful.  Return 1 if nothing to delete.
        int delete_oldest();

// Calculate current size of cache in bytes
        int64_t get_memory_usage();

        Mutex *lock;
// Current position of search
        CacheItemBase *current_item;
};



#endif

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