| public static JournalFile ( string baseName, int version ) : string | ||
| baseName | string | |
| version | int | |
| return | string | |
public JournaledMemTable(string baseFileName, int version)
{
_baseFileName = baseFileName;
_version = version;
_memTable = new MemTable();
// If the journal exists from a previous run, then load its data into the memtable
string journalFile = Config.JournalFile(baseFileName, version);
if (File.Exists(journalFile))
{
var journalReader = new JournalReader(baseFileName, version);
try {
foreach (var pair in journalReader.Enumerate())
{
_memTable.Add(pair.Key, pair.Value);
}
} finally {
journalReader.Close();
}
_journal = new JournalWriter(baseFileName, version, true);
}
else
{
_journal = new JournalWriter(baseFileName, version, false);
}
}
public JournalWriter(string baseFileName, int version, bool append)
{
_fileName = Config.JournalFile(baseFileName, version);
FileMode fileMode = append ? FileMode.Append : FileMode.Create;
_writer = new BinaryWriter(new FileStream(_fileName, fileMode, FileAccess.Write, FileShare.None, 1024, FileOptions.SequentialScan));
}
#pragma warning restore 420
private void CheckForIncompleteJournalRotation(string baseFileName, int currentMemTableVersion)
{
int previousMemTableVersion = currentMemTableVersion - 1;
// Is there a left-over journal from a previous rotation that was aborted while in rotation.
if (File.Exists(Config.JournalFile(baseFileName, previousMemTableVersion)))
{
var memTable = new JournaledMemTable(baseFileName, previousMemTableVersion);
memTable.WriteToSortedBlockTable(_manifest);
memTable.Close();
}
}
public JournalReader(string baseFileName, int version)
{
_fileName = Config.JournalFile(baseFileName, version);
_reader = new BinaryReader(new FileStream(_fileName, FileMode.Open, FileAccess.Read, FileShare.None, 1024, false));
}