public PersistedStream(ulong startFileSize, string fileName, bool createNew, InstrumentationInterface logger) { this.logger = logger; string shadowFileName = fileName + ".shadow"; if (File.Exists(fileName) && !createNew) { this.fileStream = new FileStream(fileName, FileMode.Open, FileAccess.ReadWrite); this.fileStreamShadow = new FileStream(shadowFileName, FileMode.Open, FileAccess.ReadWrite); isInitialized = true; } else { if (File.Exists(fileName)) { File.Delete(fileName); File.Delete(shadowFileName); } this.fileStream = new FileStream(fileName, FileMode.CreateNew, FileAccess.ReadWrite); this.fileStream.SetLength((long)startFileSize); this.fileStreamShadow = new FileStream(shadowFileName, FileMode.CreateNew, FileAccess.ReadWrite); isInitialized = false; } this.binaryWriter = new BinaryWriter(this.fileStream); this.binaryReader = new BinaryReader(this.fileStream); this.binaryReaderShadow = new BinaryReader(this.fileStreamShadow); this.binaryWriterShadow = new BinaryWriter(this.fileStreamShadow); this.fileName = fileName; }
public PageManager(uint defaultPageSize, IPersistedStream persistedStream, IBufferPool bufferPool, ILockManager lockManager, InstrumentationInterface logger) { this.pageSize = defaultPageSize; this.persistedStream = persistedStream; this.lockManager = lockManager; this.logger = logger; this.bufferPool = bufferPool; this.AllocatationMapPages = new List <BitTrackingPage>(); if (!this.persistedStream.IsInitialized()) { logger.LogInfo("Initializing the persisted stream."); using (ITransaction tran = new NotLoggedTransaction()) { MixedPage allocationMapFirstPage = new MixedPage(pageSize, (ulong)AllocationMapPageId, new [] { new ColumnInfo(ColumnType.Int) }, PageManagerConstants.NullPageId, PageManagerConstants.NullPageId, new byte[4096], 0, tran); BitTrackingPage.NullifyMixedPage(allocationMapFirstPage, tran); this.AllocatationMapPages.Add(new BitTrackingPage(allocationMapFirstPage)); this.persistedStream.MarkInitialized(); } } else { // TODO: Read boot page. logger.LogInfo("Using already initialized stream."); ulong position = AllocationMapPageId * this.pageSize; MixedPage allocationMapFirstPage = (MixedPage)this.persistedStream.SeekAndRead(position, PageType.MixedPage, this.bufferPool, new ColumnInfo[] { new ColumnInfo(ColumnType.Int) }).Result; this.AllocatationMapPages.Add(new BitTrackingPage(allocationMapFirstPage)); using (ITransaction tran = new NotLoggedTransaction()) { // TODO: Here we only iterate the first page. // These pages need to be linked... foreach (int _ in this.AllocatationMapPages.First().FindAllSet(tran)) { this.pageCount++; } } } }