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reftable: add merged table view

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This adds an abstract, read-only interface to the ref database.

This primitive is used to construct the read view of the ref database
(the read view is constructed by merging several *.ref files). It also
provides the mechanism to provide a unified view of the refs in the main
repository and the per-worktree refs.

Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Han-Wen Nienhuys
2021-10-07 20:25:11 +00:00
committed by Junio C Hamano
parent 3b34f636df
commit 1ae2b8cda8
6 changed files with 943 additions and 0 deletions
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38
reftable/merged.h Normal file
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/*
Copyright 2020 Google LLC
Use of this source code is governed by a BSD-style
license that can be found in the LICENSE file or at
https://developers.google.com/open-source/licenses/bsd
*/
#ifndef MERGED_H
#define MERGED_H
#include "pq.h"
struct reftable_merged_table {
struct reftable_table *stack;
size_t stack_len;
uint32_t hash_id;
/* If unset, produce deletions. This is useful for compaction. For the
* full stack, deletions should be produced. */
int suppress_deletions;
uint64_t min;
uint64_t max;
};
struct merged_iter {
struct reftable_iterator *stack;
uint32_t hash_id;
size_t stack_len;
uint8_t typ;
int suppress_deletions;
struct merged_iter_pqueue pq;
};
void merged_table_release(struct reftable_merged_table *mt);
#endif