/// <summary> /// Returns table for READ, WRITE FUNC /// </summary> /// <param name="userTableName"></param> /// <returns></returns> internal LTrie GetTable(string userTableName) { string tableName = GetUserTableNameAsString(userTableName); //TODO pattern based mapping If table doesn't exist we create it with properties which could be supplied after db init as regex theme. //Schema protocol: 2 bytes - protocol version, other data //For protocol 1: first 8 bytes will be TheFileName, starting from db10000-dbN (0-N ulong). up to 10000 are reserved for dbreeze. //Table names are UTF-8 based, no limits ulong fileName = 0; OpenTable otl = null; _sync_openTablesHolder.EnterUpgradeableReadLock(); try { _openTablesHolder.TryGetValue(tableName, out otl); if (otl != null) { //Try to increase usage and return LTrie otl.Add(); return otl.Trie; } //Probably table Exists in db but not in openTablesHolder _sync_openTablesHolder.EnterWriteLock(); try { //UpgradeableRead recheck _openTablesHolder.TryGetValue(tableName, out otl); if (otl != null) { //Try to increase usage and return LTrie otl.Add(); return otl.Trie; } byte[] btTableName = GetUserTableNameAsByte(userTableName); //Trying to get fileName from cache fileName = this.cachedTableNames.GetFileName(tableName); // LTrieRow row = null; bool tableExists = false; if (fileName == 0) { LTrieRow row = LTrie.GetKey(btTableName, false); if (row.Exists) { tableExists = true; byte[] fullValue = row.GetFullValue(false); //Can be parsed different. First protocol version is 1 ushort schemeProtocol = fullValue.Substring(0, 2).To_UInt16_BigEndian(); switch (schemeProtocol) { case 1: fileName = fullValue.Substring(2, 8).To_UInt64_BigEndian(); break; default: throw DBreezeException.Throw(DBreezeException.eDBreezeExceptions.SCHEME_FILE_PROTOCOL_IS_UNKNOWN); } } else { tableExists = false; //Creating new table. //Checking table name validity //this will throw exception, if not valid DbUserTables.UserTableNameIsOk(userTableName); //Creating such table and renewing LastFileNumber counter //Adding to LastFileNumber LastFileNumber++; ////Deleting physical files related to the table, if they existed - normally they should not //DeleteAllReleatedTableFiles(Path.Combine(Engine.MainFolder, LastFileNumber.ToString())); byte[] lft = LastFileNumber.To_8_bytes_array_BigEndian(); //Writing this number to Schema file LTrie.Add(Encoding.UTF8.GetBytes(LastFileNumberKeyName), lft); //Creating table self and writing to Schema file LTrie.Add(btTableName, new byte[] { 0, 1 } //Protocol version 1 .Concat(lft)); //Number of the file //Committing both records LTrie.Commit(); fileName = LastFileNumber; this.cachedTableNames.Add(tableName, fileName); } } else tableExists = true; //Creating LTrie, adding it to _openTablesHolder //Seeting up Trie TableName, OTHER SETTINGS TrieSettings ts = new TrieSettings(); IStorage storage = null; ////Checking if default Flusg Disk behaviour was overriden //ts.DiskFlushBehaviour = Engine.Configuration.DiskFlushBehaviour; ////Checking if we have alternative DiskFlush behaviour //foreach (var pattern in Engine.Configuration.AlternativeDiskFlushBehaviour) //{ // //pattern.Key // if (DbUserTables.PatternsIntersect(pattern.Key, userTableName)) // { // ts.DiskFlushBehaviour = pattern.Value; // break; // } //} string alternativeTableLocation = String.Empty; if (CheckAlternativeTableLocationsIntersections(userTableName, out alternativeTableLocation)) { ts.StorageWasOverriden = true; if (alternativeTableLocation == String.Empty) { ts.AlternativeTableStorageType = DBreezeConfiguration.eStorage.MEMORY; storage = new StorageLayer(Path.Combine(Engine.MainFolder, fileName.ToString()), ts, Engine.Configuration); } else { ts.AlternativeTableStorageType = DBreezeConfiguration.eStorage.DISK; ts.AlternativeTableStorageFolder = alternativeTableLocation; DirectoryInfo diAlt = new DirectoryInfo(alternativeTableLocation); if (!diAlt.Exists) diAlt.Create(); if (!tableExists) { //Deleting physical files related to the table, if they existed - normally they should not DeleteAllReleatedTableFiles(Path.Combine(ts.AlternativeTableStorageFolder, LastFileNumber.ToString())); } storage = new StorageLayer(Path.Combine(ts.AlternativeTableStorageFolder, fileName.ToString()), ts, Engine.Configuration); } } else { if (!tableExists) { //Deleting physical files related to the table, if they existed - normally they should not DeleteAllReleatedTableFiles(Path.Combine(Engine.MainFolder, LastFileNumber.ToString())); } storage = new StorageLayer(Path.Combine(Engine.MainFolder, fileName.ToString()), ts, Engine.Configuration); } //storage = new StorageLayer(Path.Combine(Engine.MainFolder, fileName.ToString()), ts, Engine.Configuration); LTrie trie = new LTrie(storage); //Setting LTrie user table name trie.TableName = userTableName; //_openTablesHolder.Add(tableName, trie); //Automatically increased usage in OpenTable constructor _openTablesHolder.Add(tableName, new OpenTable(trie)); return trie; } catch (System.Exception ex) { //CASCADE throw ex; } finally { _sync_openTablesHolder.ExitWriteLock(); } } catch (Exception ex) { throw DBreezeException.Throw(DBreezeException.eDBreezeExceptions.SCHEME_GET_TABLE_WRITE_FAILED, tableName, ex); } finally { _sync_openTablesHolder.ExitUpgradeableReadLock(); } }
private void RestoreNotFinishedTransactions() { //TODO Trie settings from the table must be taken from schema (when they will differ) //STORE FILE NAME of rollback not table name try { byte[] btCommittedTablesNames =null; List<string> committedTablesNames = new List<string>(); if (LTrie.Count(false) == 0) //All ok { LTrie.RemoveAll(true); return; } string physicalPathToTheUserTable = String.Empty; //Settigns and storage for Committed tables !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! MUST BE TAKEN FROM SCHEMA, FOR NOW DEFAULT TrieSettings ltrSet = null; IStorage storage = null; DBreeze.LianaTrie.LTrie ltrie = null; foreach (var row in LTrie.IterateForward()) { btCommittedTablesNames = row.GetFullValue(true); committedTablesNames = System.Text.Encoding.UTF8.GetString(btCommittedTablesNames).DeserializeXml<List<string>>(); foreach (var fn in committedTablesNames) { //Trying to get path from the Schema, there is universal function for getting table physical TABLE FULL PATH /NAME physicalPathToTheUserTable = Engine.DBreezeSchema.GetPhysicalPathToTheUserTable(fn); //Returned path can be empty, if no more such table if (physicalPathToTheUserTable == String.Empty) continue; //We don't restore in-memory tables if (physicalPathToTheUserTable == "MEMORY") continue; //we open ltrie, and it automatically restores rollback ltrSet = new TrieSettings(); //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! MUST BE TAKEN FROM SCHEMA, FOR NOW DEFAULT //storage = new TrieDiskStorage(physicalPathToTheUserTable, ltrSet, Engine.Configuration); storage = new StorageLayer(physicalPathToTheUserTable, ltrSet, Engine.Configuration); ltrie = new LTrie(storage); //closing trie, that Schema could open it again ltrie.Dispose(); ////Deleting rollback file for such table //physicalPathToTheUserTable += ".rol"; //System.IO.File.Delete(physicalPathToTheUserTable); } committedTablesNames.Clear(); } //If all ok, recreate file LTrie.RemoveAll(true); } catch (OperationCanceledException ex) { throw ex; } //catch (System.Threading.ThreadAbortException ex) //{ // //We don'T make DBisOperable = false; // throw ex; //} catch (Exception ex) { //BRINGS TO DB NOT OPERATABLE this.Engine.DBisOperable = false; this.Engine.DBisOperableReason = "TransactionsCoordinator.RestoreNotFinishedTransaction"; //NOT CASCADE ADD EXCEPTION throw DBreezeException.Throw(DBreezeException.eDBreezeExceptions.CLEAN_ROLLBACK_FILES_FOR_FINISHED_TRANSACTIONS_FAILED); } }