public ReadOnlyTransaction(Spreads.LMDB.ReadOnlyTransaction tx, DatabasesHolder databasesHolder, IndexesHolder indexesHolder)
: base(databasesHolder, indexesHolder)
{
this.tx = tx;
this.databasesHolder = databasesHolder;
this.indexesHolder = indexesHolder;
}
public ReadWriteTransaction(Transaction tx, DatabasesHolder databasesHolder, IndexesHolder indexesHolder)
: base(databasesHolder, indexesHolder)
{
Monitor.Enter(locker);
this.tx = tx;
this.databasesHolder = databasesHolder;
this.indexesHolder = indexesHolder;
}
private DatabaseContext(string pathToDatabase, long mapSize, bool unsafeAsync, int hashTablesCount)
{
HashTablesCount = hashTablesCount;
// Check if current process is 64 bit one (needed for lmdb to run)
if (!Environment.Is64BitProcess)
{
throw new BadRuntimeException();
}
var lmdbOpenFlags = LMDBEnvironmentFlags.NoMemInit;
if (unsafeAsync)
{
lmdbOpenFlags = lmdbOpenFlags | LMDBEnvironmentFlags.MapAsync | LMDBEnvironmentFlags.NoLock | LMDBEnvironmentFlags.WriteMap;
}
environment = LMDBEnvironment.Create(pathToDatabase, lmdbOpenFlags, disableAsync: true);
environment.MapSize = mapSize;
environment.MaxDatabases = HashTablesCount + 5;
environment.MaxReaders = 1000;
environment.Open();
// Open all database to make sure they exists and to hold their handles
var configuration = new DatabaseConfig(DbFlags.Create | DbFlags.IntegerKey);
var tracksDatabase = environment.OpenDatabase("tracks", configuration);
var subFingerprintsDatabase = environment.OpenDatabase("subFingerprints", configuration);
var hashTables = new Database[hashTablesCount];
var hashTableConfig = new DatabaseConfig(
DbFlags.Create
| DbFlags.DuplicatesSort
| DbFlags.IntegerKey
| DbFlags.IntegerDuplicates
);
for (var i = 0; i < hashTablesCount; i++)
{
hashTables[i] = environment.OpenDatabase($"HashTable{i}", hashTableConfig);
}
databasesHolder = new DatabasesHolder(tracksDatabase, subFingerprintsDatabase, hashTables);
// Open all databases for indexes
var isrcIndex = environment.OpenDatabase("isrcIndex", new DatabaseConfig(DbFlags.Create));
var titleArtistIndex = environment.OpenDatabase("titleArtistIndex", new DatabaseConfig(DbFlags.Create | DbFlags.DuplicatesSort));
var tracksSubfingerprintsIndex = environment.OpenDatabase("tracksSubfingerprintsIndex", new DatabaseConfig(
DbFlags.Create
| DbFlags.DuplicatesSort
| DbFlags.IntegerKey
| DbFlags.IntegerDuplicates
));
indexesHolder = new IndexesHolder(isrcIndex, titleArtistIndex, tracksSubfingerprintsIndex);
}
protected BaseTransaction(DatabasesHolder databasesHolder, IndexesHolder indexesHolder)
{
this.databasesHolder = databasesHolder;
this.indexesHolder = indexesHolder;
}