public IEnumerable<KeyValuePair<Key, Value>> Enumerate()
{
byte[] key = null;
byte[] value = null;
bool data = true;
while (data) {
try {
int keyLen = _reader.Read7BitEncodedInt();
if (keyLen < 0 || keyLen > Config.MaxSmallValueSize) {
throw new InvalidOperationException("Key length is out of range.");
}
key = _reader.ReadBytes(keyLen);
if (key.Length != keyLen)
throw new InvalidOperationException();
int valueLen = _reader.Read7BitEncodedInt();
if (valueLen <= 0)
throw new InvalidOperationException("Value length must be greater than 0.");
value = _reader.ReadBytes(valueLen);
if (valueLen != value.Length)
throw new InvalidOperationException("Value length does not match expected data length.");
} catch (EndOfStreamException) {
data = false;
} catch (InvalidOperationException) {
data = false;
} catch {
data = false;
}
if (data)
yield return new KeyValuePair<Key, Value>(Key.FromBytes(key), Value.FromBytes(value));
}
}
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);
}
}
