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 void ReadAndWriteJournalFile()
{
string path = Path.GetFullPath ("TestData\\RWJournal");
if (!Directory.Exists (path)) Directory.CreateDirectory (path);
JournalWriter jw = new JournalWriter (path, 324, false);
List<KeyValuePair<Key, Value>> items = new List<KeyValuePair<Key, Value>> ();
for (int i = 0; i < 10000; i++) {
Key randKey = Key.Random (20);
Value randValue = Value.Random (100);
jw.Add (randKey, randValue);
items.Add (new KeyValuePair<Key, Value> (randKey, randValue));
}
jw.Close ();
JournalReader jr = new JournalReader (path, 324);
int j = 0;
foreach (var pair in jr.Enumerate()) {
Assert.AreEqual (items [j].Key, pair.Key);
Assert.AreEqual (items [j].Value, pair.Value);
j++;
}
jr.Close ();
}
public void ReadFromJournal(string fileName, int version) // Reads from the journal.
{
lock (_tableLock) {
JournalReader jr = new JournalReader(fileName, version);
try {
foreach (var pair in jr.Enumerate())
{
Add(pair.Key, pair.Value);
}
} finally {
jr.Close();
}
}
}
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);
}
// Reads from the journal.
public void ReadFromJournal(string fileName, int version)
{
lock (_tableLock) {
JournalReader jr = new JournalReader (fileName, version);
try {
foreach (var pair in jr.Enumerate())
Add (pair.Key, pair.Value);
} finally {
jr.Close ();
}
}
}
public void ReadCorruptedJournalFile()
{
string path = Path.GetFullPath ("TestData\\ReadCorruptedJournal");
if (!Directory.Exists (path)) Directory.CreateDirectory (path);
JournalWriter jw = new JournalWriter (path, 324, false);
List<KeyValuePair<Key, Value>> items = new List<KeyValuePair<Key, Value>> ();
for (int i = 0; i < 10; i++) {
Key randKey = Key.Random (20);
Value randValue = Value.Random (100);
jw.Add (randKey, randValue);
items.Add (new KeyValuePair<Key, Value> (randKey, randValue));
}
jw.Close ();
// Reopen the file and add a partial record
var fileName = Config.JournalFile (path, 324);
var writer = new BinaryWriter (new FileStream (fileName, FileMode.Append, FileAccess.Write, FileShare.None, 1024, false));
Key key = Key.Random (20);
writer.Write7BitEncodedInt (key.Length);
writer.Write (key.InternalBytes);
writer.Write7BitEncodedInt (0);
writer.Flush ();
writer.Close ();
JournalReader jr = new JournalReader (path, 324);
int j = 0;
foreach (var pair in jr.Enumerate()) {
Assert.AreEqual (items [j].Key, pair.Key);
Assert.AreEqual (items [j].Value, pair.Value);
j++;
}
jr.Close ();
}