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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_DB_IMPL_H_
-#define STORAGE_LEVELDB_DB_DB_IMPL_H_
-
-#include <set>
-#include "db/dbformat.h"
-#include "db/log_writer.h"
-#include "db/snapshot.h"
-#include "leveldb/db.h"
-#include "leveldb/env.h"
-#include "port/port.h"
-
-namespace leveldb {
-
-class MemTable;
-class TableCache;
-class Version;
-class VersionEdit;
-class VersionSet;
-
-class DBImpl : public DB {
- public:
-  DBImpl(const Options& options, const std::string& dbname);
-  virtual ~DBImpl();
-
-  // Implementations of the DB interface
-  virtual Status Put(const WriteOptions&, const Slice& key, const Slice& value);
-  virtual Status Delete(const WriteOptions&, const Slice& key);
-  virtual Status Write(const WriteOptions& options, WriteBatch* updates);
-  virtual Status Get(const ReadOptions& options,
-                     const Slice& key,
-                     std::string* value);
-  virtual Iterator* NewIterator(const ReadOptions&);
-  virtual const Snapshot* GetSnapshot();
-  virtual void ReleaseSnapshot(const Snapshot* snapshot);
-  virtual bool GetProperty(const Slice& property, std::string* value);
-  virtual void GetApproximateSizes(const Range* range, int n, uint64_t* sizes);
-
-  // Extra methods (for testing) that are not in the public DB interface
-
-  // Compact any files in the named level that overlap [begin,end]
-  void TEST_CompactRange(
-      int level,
-      const std::string& begin,
-      const std::string& end);
-
-  // Force current memtable contents to be compacted.
-  Status TEST_CompactMemTable();
-
-  // Return an internal iterator over the current state of the database.
-  // The keys of this iterator are internal keys (see format.h).
-  // The returned iterator should be deleted when no longer needed.
-  Iterator* TEST_NewInternalIterator();
-
-  // Return the maximum overlapping data (in bytes) at next level for any
-  // file at a level >= 1.
-  int64_t TEST_MaxNextLevelOverlappingBytes();
-
- private:
-  friend class DB;
-
-  Iterator* NewInternalIterator(const ReadOptions&,
-                                SequenceNumber* latest_snapshot);
-
-  Status NewDB();
-
-  // Recover the descriptor from persistent storage.  May do a significant
-  // amount of work to recover recently logged updates.  Any changes to
-  // be made to the descriptor are added to *edit.
-  Status Recover(VersionEdit* edit);
-
-  void MaybeIgnoreError(Status* s) const;
-
-  // Delete any unneeded files and stale in-memory entries.
-  void DeleteObsoleteFiles();
-
-  // Called when an iterator over a particular version of the
-  // descriptor goes away.
-  static void Unref(void* arg1, void* arg2);
-
-  // Compact the in-memory write buffer to disk.  Switches to a new
-  // log-file/memtable and writes a new descriptor iff successful.
-  Status CompactMemTable();
-
-  Status RecoverLogFile(uint64_t log_number,
-                        VersionEdit* edit,
-                        SequenceNumber* max_sequence);
-
-  Status WriteLevel0Table(MemTable* mem, VersionEdit* edit);
-
-  Status MakeRoomForWrite(bool force /* compact even if there is room? */);
-  bool HasLargeValues(const WriteBatch& batch) const;
-
-  // Process data in "*updates" and return a status.  "assigned_seq"
-  // is the sequence number assigned to the first mod in "*updates".
-  // If no large values are encountered, "*final" is set to "updates".
-  // If large values were encountered, registers the references of the
-  // large values with the VersionSet, writes the large values to
-  // files (if appropriate), and allocates a new WriteBatch with the
-  // large values replaced with indirect references and stores a
-  // pointer to the new WriteBatch in *final.  If *final != updates on
-  // return, then the client should delete *final when no longer
-  // needed.  Returns OK on success, and an appropriate error
-  // otherwise.
-  Status HandleLargeValues(SequenceNumber assigned_seq,
-                           WriteBatch* updates,
-                           WriteBatch** final);
-
-  // Helper routine for HandleLargeValues
-  void MaybeCompressLargeValue(
-      const Slice& raw_value,
-      Slice* file_bytes,
-      std::string* scratch,
-      LargeValueRef* ref);
-
-  struct CompactionState;
-
-  void MaybeScheduleCompaction();
-  static void BGWork(void* db);
-  void BackgroundCall();
-  void BackgroundCompaction();
-  void CleanupCompaction(CompactionState* compact);
-  Status DoCompactionWork(CompactionState* compact);
-
-  Status OpenCompactionOutputFile(CompactionState* compact);
-  Status FinishCompactionOutputFile(CompactionState* compact, Iterator* input);
-  Status InstallCompactionResults(CompactionState* compact);
-
-  // Constant after construction
-  Env* const env_;
-  const InternalKeyComparator internal_comparator_;
-  const Options options_;  // options_.comparator == &internal_comparator_
-  bool owns_info_log_;
-  bool owns_cache_;
-  const std::string dbname_;
-
-  // table_cache_ provides its own synchronization
-  TableCache* table_cache_;
-
-  // Lock over the persistent DB state.  Non-NULL iff successfully acquired.
-  FileLock* db_lock_;
-
-  // State below is protected by mutex_
-  port::Mutex mutex_;
-  port::AtomicPointer shutting_down_;
-  port::CondVar bg_cv_;          // Signalled when !bg_compaction_scheduled_
-  port::CondVar compacting_cv_;  // Signalled when !compacting_
-  MemTable* mem_;
-  MemTable* imm_;                // Memtable being compacted
-  port::AtomicPointer has_imm_;  // So bg thread can detect non-NULL imm_
-  WritableFile* logfile_;
-  log::Writer* log_;
-  SnapshotList snapshots_;
-
-  // Set of table files to protect from deletion because they are
-  // part of ongoing compactions.
-  std::set<uint64_t> pending_outputs_;
-
-  // Has a background compaction been scheduled or is running?
-  bool bg_compaction_scheduled_;
-
-  // Is there a compaction running?
-  bool compacting_;
-
-  VersionSet* versions_;
-
-  // Have we encountered a background error in paranoid mode?
-  Status bg_error_;
-
-  // Per level compaction stats.  stats_[level] stores the stats for
-  // compactions that produced data for the specified "level".
-  struct CompactionStats {
-    int64_t micros;
-    int64_t bytes_read;
-    int64_t bytes_written;
-
-    CompactionStats() : micros(0), bytes_read(0), bytes_written(0) { }
-
-    void Add(const CompactionStats& c) {
-      this->micros += c.micros;
-      this->bytes_read += c.bytes_read;
-      this->bytes_written += c.bytes_written;
-    }
-  };
-  CompactionStats stats_[config::kNumLevels];
-
-  // No copying allowed
-  DBImpl(const DBImpl&);
-  void operator=(const DBImpl&);
-
-  const Comparator* user_comparator() const {
-    return internal_comparator_.user_comparator();
-  }
-};
-
-// Sanitize db options.  The caller should delete result.info_log if
-// it is not equal to src.info_log.
-extern Options SanitizeOptions(const std::string& db,
-                               const InternalKeyComparator* icmp,
-                               const Options& src);
-
-}
-
-#endif  // STORAGE_LEVELDB_DB_DB_IMPL_H_