/// <summary> /// Constructor /// </summary> /// <param name="hlog"></param> /// <param name="beginAddress"></param> /// <param name="endAddress"></param> /// <param name="scanBufferingMode"></param> public unsafe BlittableScanIterator(BlittableAllocator <Key, Value> hlog, long beginAddress, long endAddress, ScanBufferingMode scanBufferingMode) { this.hlog = hlog; this.beginAddress = beginAddress; this.endAddress = endAddress; currentAddress = beginAddress; if (scanBufferingMode == ScanBufferingMode.SinglePageBuffering) { frameSize = 1; } else { frameSize = 2; } frame = new BlittableFrame(frameSize, hlog.PageSize, hlog.GetDeviceSectorSize()); loaded = new CountdownEvent[frameSize]; var frameNumber = (currentAddress >> hlog.LogPageSizeBits) % frameSize; hlog.AsyncReadPagesFromDeviceToFrame (currentAddress >> hlog.LogPageSizeBits, 1, AsyncReadPagesCallback, Empty.Default, frame, out loaded[frameNumber]); }
/// <summary> /// Constructor /// </summary> /// <param name="hlog"></param> /// <param name="beginAddress"></param> /// <param name="endAddress"></param> /// <param name="scanBufferingMode"></param> /// <param name="epoch"></param> /// <param name="forceInMemory">Provided address range is known by caller to be in memory, even if less than HeadAddress</param> public BlittableScanIterator(BlittableAllocator <Key, Value> hlog, long beginAddress, long endAddress, ScanBufferingMode scanBufferingMode, LightEpoch epoch, bool forceInMemory = false) : base(beginAddress == 0 ? hlog.GetFirstValidLogicalAddress(0) : beginAddress, endAddress, scanBufferingMode, epoch, hlog.LogPageSizeBits) { this.hlog = hlog; this.forceInMemory = forceInMemory; if (frameSize > 0) { frame = new BlittableFrame(frameSize, hlog.PageSize, hlog.GetDeviceSectorSize()); } }
/// <summary> /// Constructor /// </summary> /// <param name="hlog"></param> /// <param name="beginAddress"></param> /// <param name="endAddress"></param> /// <param name="scanBufferingMode"></param> /// <param name="epoch"></param> /// <param name="forceInMemory">Provided address range is known by caller to be in memory, even if less than HeadAddress</param> public unsafe BlittableScanIterator(BlittableAllocator <Key, Value> hlog, long beginAddress, long endAddress, ScanBufferingMode scanBufferingMode, LightEpoch epoch, bool forceInMemory = false) { this.hlog = hlog; this.forceInMemory = forceInMemory; // If we are protected when creating the iterator, we do not need per-GetNext protection if (!epoch.ThisInstanceProtected()) { this.epoch = epoch; } if (beginAddress == 0) { beginAddress = hlog.GetFirstValidLogicalAddress(0); } this.endAddress = endAddress; currentAddress = -1; nextAddress = beginAddress; if (scanBufferingMode == ScanBufferingMode.SinglePageBuffering) { frameSize = 1; } else if (scanBufferingMode == ScanBufferingMode.DoublePageBuffering) { frameSize = 2; } else if (scanBufferingMode == ScanBufferingMode.NoBuffering) { frameSize = 0; return; } frame = new BlittableFrame(frameSize, hlog.PageSize, hlog.GetDeviceSectorSize()); loaded = new CountdownEvent[frameSize]; // Only load addresses flushed to disk if (nextAddress < hlog.HeadAddress && !forceInMemory) { var frameNumber = (nextAddress >> hlog.LogPageSizeBits) % frameSize; hlog.AsyncReadPagesFromDeviceToFrame (nextAddress >> hlog.LogPageSizeBits, 1, endAddress, AsyncReadPagesCallback, Empty.Default, frame, out loaded[frameNumber]); } }
/// <summary> /// Constructor /// </summary> /// <param name="fasterLog"></param> /// <param name="hlog"></param> /// <param name="beginAddress"></param> /// <param name="endAddress"></param> /// <param name="scanBufferingMode"></param> /// <param name="epoch"></param> /// <param name="headerSize"></param> /// <param name="name"></param> /// <param name="getMemory"></param> /// <param name="scanUncommitted"></param> internal unsafe FasterLogScanIterator(FasterLog fasterLog, BlittableAllocator <Empty, byte> hlog, long beginAddress, long endAddress, GetMemory getMemory, ScanBufferingMode scanBufferingMode, LightEpoch epoch, int headerSize, string name, bool scanUncommitted = false) : base(beginAddress == 0 ? hlog.GetFirstValidLogicalAddress(0) : beginAddress, endAddress, scanBufferingMode, epoch, hlog.LogPageSizeBits) { this.fasterLog = fasterLog; this.allocator = hlog; this.getMemory = getMemory; this.headerSize = headerSize; this.scanUncommitted = scanUncommitted; this.name = name; CompletedUntilAddress = beginAddress; if (frameSize > 0) { frame = new BlittableFrame(frameSize, hlog.PageSize, hlog.GetDeviceSectorSize()); } }
/// <summary> /// Constructor /// </summary> /// <param name="fasterLog"></param> /// <param name="hlog"></param> /// <param name="beginAddress"></param> /// <param name="endAddress"></param> /// <param name="scanBufferingMode"></param> /// <param name="epoch"></param> /// <param name="headerSize"></param> /// <param name="name"></param> /// <param name="getMemory"></param> /// <param name="scanUncommitted"></param> internal unsafe FasterLogScanIterator(FasterLog fasterLog, BlittableAllocator <Empty, byte> hlog, long beginAddress, long endAddress, GetMemory getMemory, ScanBufferingMode scanBufferingMode, LightEpoch epoch, int headerSize, string name, bool scanUncommitted = false) { this.fasterLog = fasterLog; this.allocator = hlog; this.getMemory = getMemory; this.epoch = epoch; this.headerSize = headerSize; this.scanUncommitted = scanUncommitted; if (beginAddress == 0) { beginAddress = hlog.GetFirstValidLogicalAddress(0); } this.name = name; this.endAddress = endAddress; NextAddress = CompletedUntilAddress = beginAddress; if (scanBufferingMode == ScanBufferingMode.SinglePageBuffering) { frameSize = 1; } else if (scanBufferingMode == ScanBufferingMode.DoublePageBuffering) { frameSize = 2; } else if (scanBufferingMode == ScanBufferingMode.NoBuffering) { frameSize = 0; return; } frame = new BlittableFrame(frameSize, hlog.PageSize, hlog.GetDeviceSectorSize()); loaded = new CountdownEvent[frameSize]; loadedCancel = new CancellationTokenSource[frameSize]; loadedPage = new long[frameSize]; nextLoadedPage = new long[frameSize]; for (int i = 0; i < frameSize; i++) { loadedPage[i] = -1; nextLoadedPage[i] = -1; loadedCancel[i] = new CancellationTokenSource(); } }
/// <summary> /// Constructor /// </summary> /// <param name="hlog"></param> /// <param name="beginAddress"></param> /// <param name="endAddress"></param> /// <param name="scanBufferingMode"></param> public unsafe BlittableScanIterator(BlittableAllocator <Key, Value> hlog, long beginAddress, long endAddress, ScanBufferingMode scanBufferingMode) { this.hlog = hlog; if (beginAddress == 0) { beginAddress = hlog.GetFirstValidLogicalAddress(0); } this.beginAddress = beginAddress; this.endAddress = endAddress; currentAddress = -1; nextAddress = beginAddress; if (scanBufferingMode == ScanBufferingMode.SinglePageBuffering) { frameSize = 1; } else if (scanBufferingMode == ScanBufferingMode.DoublePageBuffering) { frameSize = 2; } else if (scanBufferingMode == ScanBufferingMode.NoBuffering) { frameSize = 0; return; } frame = new BlittableFrame(frameSize, hlog.PageSize, hlog.GetDeviceSectorSize()); loaded = new CountdownEvent[frameSize]; // Only load addresses flushed to disk if (nextAddress < hlog.HeadAddress) { var frameNumber = (nextAddress >> hlog.LogPageSizeBits) % frameSize; hlog.AsyncReadPagesFromDeviceToFrame (nextAddress >> hlog.LogPageSizeBits, 1, endAddress, AsyncReadPagesCallback, Empty.Default, frame, out loaded[frameNumber]); } }