public void WriteSnapshot(LogWriter logWriter, VersionSet versionSet)
{
var edit = new VersionEdit();
AddMetadata(edit, storageContext.Options);
AddCompactionPointers(edit, versionSet);
AddFiles(edit, versionSet);
edit.EncodeTo(logWriter);
}
private static void AddCompactionPointers(VersionEdit edit, VersionSet versionSet)
{
for (int level = 0; level < Config.NumberOfLevels; level++)
{
var compactionPointer = versionSet.CompactionPointers[level];
if (!compactionPointer.IsEmpty())
{
edit.SetCompactionPointer(level, new InternalKey(compactionPointer));
}
}
}
private static void AddFiles(VersionEdit edit, VersionSet versionSet)
{
for (int level = 0; level < Config.NumberOfLevels; level++)
{
var files = versionSet.Current.Files[level];
foreach (var file in files)
{
edit.AddFile(level, file);
}
}
}
public Snapshot CreateNewSnapshot(VersionSet versionSet)
{
var snapshot = new Snapshot
{
Sequence = versionSet.LastSequence
};
snapshots.TryAdd(snapshot, null);
return snapshot;
}
public StorageState(string name, StorageOptions options)
{
_perfCounters = new PerfCounters(name);
_cancellationTokenSource = new CancellationTokenSource();
CancellationToken = _cancellationTokenSource.Token;
Options = options;
InternalKeyComparator = new InternalKeyComparator(options.Comparator);
DatabaseName = name;
Lock = new AsyncLock();
FileSystem = new FileSystem(DatabaseName);
MemTable = new MemTable(this);
TableCache = new TableCache(this);
VersionSet = new VersionSet(this);
Compactor = new BackgroundCompactor(this);
Snapshooter = new Snapshooter(this);
}
public Version(StorageState storageContext, VersionSet versionSet)
: this(storageContext)
{
VersionSet = versionSet;
}
