73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
/*
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Copyright 2020 Google LLC
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file or at
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https://developers.google.com/open-source/licenses/bsd
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*/
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#ifndef REFTABLE_MERGED_H
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#define REFTABLE_MERGED_H
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#include "reftable-iterator.h"
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/*
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* Merged tables
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*
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* A ref database kept in a sequence of table files. The merged_table presents a
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* unified view to reading (seeking, iterating) a sequence of immutable tables.
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*
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* The merged tables are on purpose kept disconnected from their actual storage
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* (eg. files on disk), because it is useful to merge tables aren't files. For
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* example, the per-workspace and global ref namespace can be implemented as a
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* merged table of two stacks of file-backed reftables.
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*/
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/* A merged table is implements seeking/iterating over a stack of tables. */
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struct reftable_merged_table;
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/* A generic reftable; see below. */
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struct reftable_table;
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/* reftable_new_merged_table creates a new merged table. It takes ownership of
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the stack array.
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*/
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int reftable_new_merged_table(struct reftable_merged_table **dest,
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struct reftable_table *stack, size_t n,
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uint32_t hash_id);
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/* returns an iterator positioned just before 'name' */
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int reftable_merged_table_seek_ref(struct reftable_merged_table *mt,
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struct reftable_iterator *it,
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const char *name);
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/* returns an iterator for log entry, at given update_index */
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int reftable_merged_table_seek_log_at(struct reftable_merged_table *mt,
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struct reftable_iterator *it,
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const char *name, uint64_t update_index);
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/* like reftable_merged_table_seek_log_at but look for the newest entry. */
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int reftable_merged_table_seek_log(struct reftable_merged_table *mt,
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struct reftable_iterator *it,
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const char *name);
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/* returns the max update_index covered by this merged table. */
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uint64_t
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reftable_merged_table_max_update_index(struct reftable_merged_table *mt);
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/* returns the min update_index covered by this merged table. */
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uint64_t
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reftable_merged_table_min_update_index(struct reftable_merged_table *mt);
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/* releases memory for the merged_table */
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void reftable_merged_table_free(struct reftable_merged_table *m);
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/* return the hash ID of the merged table. */
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uint32_t reftable_merged_table_hash_id(struct reftable_merged_table *m);
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/* create a generic table from reftable_merged_table */
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void reftable_table_from_merged_table(struct reftable_table *tab,
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struct reftable_merged_table *table);
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#endif
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