Adding upstream version 1:10.11.6.upstream/1%10.11.6upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 108 insertions, 0 deletions

diff --git a/storage/rocksdb/rdb_cf_manager.h b/storage/rocksdb/rdb_cf_manager.h
new file mode 100644
index 00000000..cf7b3d6c
--- /dev/null
+++ b/storage/rocksdb/rdb_cf_manager.h
@@ -0,0 +1,108 @@
+/*
+   Copyright (c) 2014, SkySQL Ab
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA */
+
+#pragma once
+
+/* C++ system header files */
+#include <map>
+#include <string>
+#include <vector>
+
+/* MySQL header files */
+#include "./sql_class.h"
+
+/* RocksDB header files */
+#include "rocksdb/db.h"
+
+/* MyRocks header files */
+#include "./rdb_cf_options.h"
+
+namespace myrocks {
+
+/*
+  We need a Column Family (CF) manager. Its functions:
+  - create column families (synchronized, don't create the same twice)
+  - keep count in each column family.
+     = the count is kept on-disk.
+     = there are no empty CFs. initially count=1.
+     = then, when doing DDL, we increase or decrease it.
+       (atomicity is maintained by being in the same WriteBatch with DDLs)
+     = if DROP discovers that now count=0, it removes the CF.
+
+  Current state is:
+  - CFs are created in a synchronized way. We can't remove them, yet.
+*/
+
+class Rdb_cf_manager {
+  std::map<std::string, rocksdb::ColumnFamilyHandle *> m_cf_name_map;
+  std::map<uint32_t, rocksdb::ColumnFamilyHandle *> m_cf_id_map;
+
+  mutable mysql_mutex_t m_mutex;
+
+  std::unique_ptr<Rdb_cf_options> m_cf_options = nullptr;
+
+ public:
+  Rdb_cf_manager(const Rdb_cf_manager &) = delete;
+  Rdb_cf_manager &operator=(const Rdb_cf_manager &) = delete;
+  Rdb_cf_manager() = default;
+
+  static bool is_cf_name_reverse(const char *const name);
+
+  /*
+    This is called right after the DB::Open() call. The parameters describe
+    column
+    families that are present in the database. The first CF is the default CF.
+  */
+  void init(std::unique_ptr<Rdb_cf_options> &&cf_options,
+            std::vector<rocksdb::ColumnFamilyHandle *> *const handles);
+  void cleanup();
+
+  /*
+    Used by CREATE TABLE.
+    - cf_name=nullptr means use default column family
+  */
+  rocksdb::ColumnFamilyHandle *get_or_create_cf(rocksdb::DB *const rdb,
+                                                const std::string &cf_name);
+
+  /* Used by table open */
+  rocksdb::ColumnFamilyHandle *get_cf(
+      const std::string &cf_name, const bool lock_held_by_caller = false) const;
+
+  /* Look up cf by id; used by datadic */
+  rocksdb::ColumnFamilyHandle *get_cf(const uint32_t id) const;
+
+  /* Used to iterate over column families for show status */
+  std::vector<std::string> get_cf_names(void) const;
+
+  /* Used to iterate over column families */
+  std::vector<rocksdb::ColumnFamilyHandle *> get_all_cf(void) const;
+
+  /* Used to delete cf by name */
+  int drop_cf(const std::string &cf_name);
+
+  void get_cf_options(const std::string &cf_name,
+                      rocksdb::ColumnFamilyOptions *const opts)
+      MY_ATTRIBUTE((__nonnull__)) {
+    m_cf_options->get_cf_options(cf_name, opts);
+  }
+
+  void update_options_map(const std::string &cf_name,
+                          const std::string &updated_options) {
+    m_cf_options->update(cf_name, updated_options);
+  }
+};
+
+}  // namespace myrocks