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-rw-r--r--src/leveldb/db/version_edit.h107
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+// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#ifndef STORAGE_LEVELDB_DB_VERSION_EDIT_H_
+#define STORAGE_LEVELDB_DB_VERSION_EDIT_H_
+
+#include <set>
+#include <utility>
+#include <vector>
+#include "db/dbformat.h"
+
+namespace leveldb {
+
+class VersionSet;
+
+struct FileMetaData {
+ int refs;
+ int allowed_seeks; // Seeks allowed until compaction
+ uint64_t number;
+ uint64_t file_size; // File size in bytes
+ InternalKey smallest; // Smallest internal key served by table
+ InternalKey largest; // Largest internal key served by table
+
+ FileMetaData() : refs(0), allowed_seeks(1 << 30), file_size(0) { }
+};
+
+class VersionEdit {
+ public:
+ VersionEdit() { Clear(); }
+ ~VersionEdit() { }
+
+ void Clear();
+
+ void SetComparatorName(const Slice& name) {
+ has_comparator_ = true;
+ comparator_ = name.ToString();
+ }
+ void SetLogNumber(uint64_t num) {
+ has_log_number_ = true;
+ log_number_ = num;
+ }
+ void SetPrevLogNumber(uint64_t num) {
+ has_prev_log_number_ = true;
+ prev_log_number_ = num;
+ }
+ void SetNextFile(uint64_t num) {
+ has_next_file_number_ = true;
+ next_file_number_ = num;
+ }
+ void SetLastSequence(SequenceNumber seq) {
+ has_last_sequence_ = true;
+ last_sequence_ = seq;
+ }
+ void SetCompactPointer(int level, const InternalKey& key) {
+ compact_pointers_.push_back(std::make_pair(level, key));
+ }
+
+ // Add the specified file at the specified number.
+ // REQUIRES: This version has not been saved (see VersionSet::SaveTo)
+ // REQUIRES: "smallest" and "largest" are smallest and largest keys in file
+ void AddFile(int level, uint64_t file,
+ uint64_t file_size,
+ const InternalKey& smallest,
+ const InternalKey& largest) {
+ FileMetaData f;
+ f.number = file;
+ f.file_size = file_size;
+ f.smallest = smallest;
+ f.largest = largest;
+ new_files_.push_back(std::make_pair(level, f));
+ }
+
+ // Delete the specified "file" from the specified "level".
+ void DeleteFile(int level, uint64_t file) {
+ deleted_files_.insert(std::make_pair(level, file));
+ }
+
+ void EncodeTo(std::string* dst) const;
+ Status DecodeFrom(const Slice& src);
+
+ std::string DebugString() const;
+
+ private:
+ friend class VersionSet;
+
+ typedef std::set< std::pair<int, uint64_t> > DeletedFileSet;
+
+ std::string comparator_;
+ uint64_t log_number_;
+ uint64_t prev_log_number_;
+ uint64_t next_file_number_;
+ SequenceNumber last_sequence_;
+ bool has_comparator_;
+ bool has_log_number_;
+ bool has_prev_log_number_;
+ bool has_next_file_number_;
+ bool has_last_sequence_;
+
+ std::vector< std::pair<int, InternalKey> > compact_pointers_;
+ DeletedFileSet deleted_files_;
+ std::vector< std::pair<int, FileMetaData> > new_files_;
+};
+
+} // namespace leveldb
+
+#endif // STORAGE_LEVELDB_DB_VERSION_EDIT_H_