/*
 * ROX-Filer, filer for the ROX desktop project
 * Thomas Leonard, <tal197@users.sourceforge.net>
 */


#ifndef _FSCACHE_H
#define _FSCACHE_H

#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
#include <glib.h>
#include <glib-object.h>

typedef GObject *(*GFSLoadFunc)(const char *pathname, gpointer user_data);
typedef void (*GFSUpdateFunc)(gpointer object,
			      const char *pathname,
			      gpointer user_data);
typedef enum {
	FSCACHE_LOOKUP_CREATE,	/* Load if missing. Update as needed. */
	FSCACHE_LOOKUP_ONLY_NEW,/* Return NULL if not present AND uptodate */
	FSCACHE_LOOKUP_PEEK,	/* Lookup; don't load or update */
	FSCACHE_LOOKUP_INIT,	/* Internal use */
	FSCACHE_LOOKUP_INSERT,	/* Internal use */
} FSCacheLookup;

struct _GFSCache
{
	GHashTable    *inode_to_stats;
	GMutex        mutex;
	GFSLoadFunc   load;
	GFSUpdateFunc update;
	gpointer      user_data;
};
typedef struct _GFSCacheKey GFSCacheKey;
typedef struct _GFSCacheData GFSCacheData;

struct _GFSCacheKey
{
	dev_t device;
	ino_t inode;
};

struct _GFSCacheData
{
	GObject *data;		/* The object from the file */
	time_t  last_lookup;

	/* Details of the file last time we checked it */
	time_t  m_time, c_time;
	off_t   length;
	mode_t  mode;
};

GFSCache *g_fscache_new(GFSLoadFunc load,
			GFSUpdateFunc update,
			gpointer user_data);
void g_fscache_destroy(GFSCache *cache);
gpointer g_fscache_lookup(GFSCache *cache, const char *pathname);
gpointer g_fscache_lookup_full(GFSCache *cache, const char *pathname,
				FSCacheLookup lookup_type,
				gboolean *found);
void g_fscache_may_update(GFSCache *cache, const char *pathname);
void g_fscache_update(GFSCache *cache, const char *pathname);
void g_fscache_remove(GFSCache *cache, const char *pathname);
void g_fscache_purge(GFSCache *cache, gint age);

void g_fscache_insert(GFSCache *cache, const char *pathname, gpointer obj,
		      gboolean update_details);

#endif /* _FSCACHE_H */