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#ifndef ODB_SOURCE_PACKED_H
#define ODB_SOURCE_PACKED_H
#include "odb/source.h"
#include "packfile-list.h"
#include "strmap.h"
/*
* A store that manages packfiles for a given object database.
*/
struct odb_source_packed {
struct odb_source base;
/*
* The list of packfiles in the order in which they have been most
* recently used.
*/
struct packfile_list packs;
/*
* Cache of packfiles which are marked as "kept", either because there
* is an on-disk ".keep" file or because they are marked as "kept" in
* memory.
*
* Should not be accessed directly, but via
* `packfile_store_get_kept_pack_cache()`. The list of packs gets
* invalidated when the stored flags and the flags passed to
* `packfile_store_get_kept_pack_cache()` mismatch.
*/
struct {
struct packed_git **packs;
unsigned flags;
} kept_cache;
/* The multi-pack index that belongs to this specific packfile store. */
struct multi_pack_index *midx;
/*
* A map of packfile names to packed_git structs for tracking which
* packs have been loaded already.
*/
struct strmap packs_by_path;
/*
* Whether packfiles have already been populated with this store's
* packs.
*/
bool initialized;
/*
* Usually, packfiles will be reordered to the front of the `packs`
* list whenever an object is looked up via them. This has the effect
* that packs that contain a lot of accessed objects will be located
* towards the front.
*
* This is usually desirable, but there are exceptions. One exception
* is when the looking up multiple objects in a loop for each packfile.
* In that case, we may easily end up with an infinite loop as the
* packfiles get reordered to the front repeatedly.
*
* Setting this field to `true` thus disables these reorderings.
*/
bool skip_mru_updates;
};
/*
* Allocate and initialize a new empty packfile store for the given object
* database.
*/
struct odb_source_packed *odb_source_packed_new(struct object_database *odb,
const char *path,
bool local);
/*
* Cast the given object database source to the packed backend. This will cause
* a BUG in case the source doesn't use this backend.
*/
static inline struct odb_source_packed *odb_source_packed_downcast(struct odb_source *source)
{
if (source->type != ODB_SOURCE_PACKED)
BUG("trying to downcast source of type '%s' to '%s'",
odb_source_type_to_name(source->type),
odb_source_type_to_name(ODB_SOURCE_PACKED));
return container_of(source, struct odb_source_packed, base);
}
#endif
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