public void TryChangingPositionCombinedWithWritingAndReading()
{
DataStreamReadableWritable dataStream = TestCollaboratorsFactory.CreateEmptyDataStream();
byte[] bytes = ByteBufferFactory.CreateByteBufferWithAllBytesSet(123, 123);
dataStream.Write(bytes, 0, bytes.Length);
dataStream.SetPosition(0);
byte[] bytes2 = ByteBufferFactory.CreateByteBufferWithAllBytesSet(14, 77);
dataStream.Write(bytes2, 0, bytes2.Length);
var bytesRead = new byte[dataStream.Length];
dataStream.SetPosition(0);
dataStream.Read(bytesRead, 0, dataStream.Length);
for (int i = 0; i < dataStream.Length; i++)
{
if (i <= 13)
{
Assert.AreEqual(77, bytesRead[i]);
}
else
{
Assert.AreEqual(123, bytesRead[i]);
}
}
}
public void TryExpandingTheStreamViaSetLengthAndThenWritingReadingFromIt()
{
DataStreamReadableWritable dataStream = TestCollaboratorsFactory.CreateEmptyDataStream();
const int testArrayLength = 500000;
dataStream.SetLength(testArrayLength);
Assert.AreEqual(testArrayLength, dataStream.Length);
Assert.AreEqual(0, dataStream.Position);
const int halfTestArray = testArrayLength / 2; //на половине пути запишем что-нибудь интересное.
dataStream.SetPosition(halfTestArray);
var bytesToWrite = new byte[halfTestArray];
for (int i = 0; i < bytesToWrite.Length; i++)
{
bytesToWrite[i] = 231;
}
dataStream.Write(bytesToWrite, 0, bytesToWrite.Length);
dataStream.SetPosition(halfTestArray);
var bytesRead = new byte[bytesToWrite.Length];
dataStream.Read(bytesRead, 0, bytesRead.Length);
MakeSureEachByteInArrayIsRight(bytesRead, 231); // и проверим, что записалось что нужно, - новый объем как будто проработан.
}
/// <summary>
/// Записывает в поток указанное число байт из массива. Если поток недостаточного размера, он увеличивается.
/// Запись производится, начиная с текущей позиции в потоке.
/// </summary>
/// <param name="bytesToWrite">Массив байт, данные из которого следует записать в поток.</param>
/// <param name="arrayOffset">Указывает начальную позицию в массиве (<paramref name="bytesToWrite"/>), с которой нужно брать байты для записи.</param>
/// <param name="count">Количество байт, которые, начиная с <paramref name="arrayOffset"/>, следует записать в поток.</param>
/// <exception cref="InsufficientSpaceException"></exception>
/// <exception cref="ObjectDisposedException"></exception>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="ArgumentException"></exception>
/// <exception cref="MaximumFileSizeReachedException"></exception>
public override void Write(byte[] bytesToWrite, int arrayOffset, int count)
{
var oldLength = _dataStream.Length;
_dataStream.Write(bytesToWrite, arrayOffset, count);
var newLength = _dataStream.Length;
if (newLength != oldLength)
{
this.PersistOwningNode();
}
}
public void MakeSureReadDoesNotThrowIfReadingBeyondTheStream()
{
DataStreamReadableWritable dataStream = TestCollaboratorsFactory.CreateEmptyDataStream();
byte[] bytes = ByteBufferFactory.CreateByteBufferWithAllBytesSet(55000, 123);
dataStream.Write(bytes, 0, bytes.Length);
dataStream.SetPosition(55000 - 35);
var largeArray = new byte[2000];
Assert.AreEqual(35, dataStream.Read(largeArray, 0, 2000));
}
public void TryPushingAFileToItsLimitSize()
{
var testCollaborators = TestCollaboratorsFactory.CreateCollaboratorsForTestingDataStreamsOneGigabyteDrive();
DataStreamReadableWritable stream =
testCollaborators.VirtualFileSystem.OpenFileForWriting(testCollaborators.FileInfo.FullPath);
var zeroes = new byte[testCollaborators.Disk.BlockSizeInBytes * 1000];
ExceptionAssert.MakeSureExceptionIsRaisedBy <MaximumFileSizeReachedException>(
delegate
{
while (stream.Length != Int32.MaxValue)
{
stream.Write(zeroes, 0, zeroes.Length);
}
});
}
public void MakeSureShrinkingFreesDiskSpace()
{
var testCollaborators = TestCollaboratorsFactory.CreateCollaboratorsForTestingDataStreams();
DataStreamReadableWritable dataStream =
testCollaborators.VirtualFileSystem.OpenFileForWriting(testCollaborators.FileInfo.FullPath);
int valueCloseToDiskSize = (int)testCollaborators.Disk.DiskSizeInBytes - 25 * testCollaborators.Disk.BlockSizeInBytes;
dataStream.SetLength(valueCloseToDiskSize);
var fileSystem = testCollaborators.VirtualFileSystem;
FileInfo newFileNode = fileSystem.CreateFile(@"\testFile2");
DataStreamReadableWritable newFileNodeStream = fileSystem.OpenFileForWriting(newFileNode.FullPath);
ExceptionAssert.MakeSureExceptionIsRaisedBy <InsufficientSpaceException>(
delegate
{
newFileNodeStream.SetLength(valueCloseToDiskSize);
});
dataStream.SetLength(0);
newFileNodeStream.SetLength(valueCloseToDiskSize);
dataStream.SetPosition(0);
const int answeringToAllQuestionsByte = 42;
byte[] bytesToWrite = ByteBufferFactory.CreateByteBufferWithAllBytesSet(valueCloseToDiskSize, answeringToAllQuestionsByte);
newFileNodeStream.Write(bytesToWrite, 0, bytesToWrite.Length);
newFileNodeStream.SetPosition(0);
var buffer = new byte[valueCloseToDiskSize];
newFileNodeStream.Read(buffer, 0, buffer.Length);
MakeSureEachByteInArrayIsRight(buffer, answeringToAllQuestionsByte);
}
private void TryWritingAndReadingBackSpecifiedByteArrays(byte[] testArray)
{
DataStreamReadableWritable dataStream = TestCollaboratorsFactory.CreateEmptyDataStream();
Assert.AreEqual(0, dataStream.Position);
Assert.AreEqual(0, dataStream.Length);
dataStream.Write(testArray, 0, testArray.Length);
Assert.AreEqual(testArray.Length, dataStream.Position);
Assert.AreEqual(testArray.Length, dataStream.Length);
var bytesRead = new byte[testArray.Length];
Assert.AreEqual(0, dataStream.Read(bytesRead, 0, testArray.Length)); // позиция в DataStream = testArray.Length; Прочитать ничего не получится.
dataStream.SetPosition(0);
dataStream.Read(bytesRead, 0, testArray.Length);
CollectionAssert.AreEqual(testArray, bytesRead);
}
public void TryReadingAndWritingPortionsOfDataByteByByte()
{
DataStreamReadableWritable dataStream = TestCollaboratorsFactory.CreateEmptyDataStream();
var stream = new MemoryStream();
var binaryWriter = new BinaryWriter(stream);
const int numberOfIntegersToTest = 2561;
for (int i = 0; i < numberOfIntegersToTest; i++)
{
binaryWriter.Write(i);
}
byte[] bytes = stream.ToArray();
for (int i = 0; i < bytes.Length; i++)
{
dataStream.Write(new byte[] { bytes[i] }, 0, 1);
}
dataStream.SetPosition(0);
var bytesRead = new byte[dataStream.Length];
dataStream.Read(bytesRead, 0, dataStream.Length);
var readingStream = new MemoryStream(bytesRead, false);
var reader = new BinaryReader(readingStream);
for (int i = 0; i < numberOfIntegersToTest; i++)
{
int number = reader.ReadInt32();
Assert.AreEqual(i, number);
}
}
public void TryWritingABigFileReadingItAfterSystemReload()
{
var testCollaborators = TestCollaboratorsFactory.CreateAllCollaborators(50000, false);
byte[] interestingBytes = ByteBufferFactory.BuildSomeGuidsIntoByteArray(5000);
int streamLength;
const int numberOfGuidPortionsToReadAndWrite = 500;
using (DataStreamReadableWritable stream = testCollaborators.VirtualFileSystem.CreateAndOpenFileForWriting(@"\hey"))
{
for (int i = 0; i < numberOfGuidPortionsToReadAndWrite; i++)
{
stream.Write(interestingBytes, 0, interestingBytes.Length);
}
streamLength = stream.Length;
}
VirtualFileSystem fileSystemReloaded =
TestCollaboratorsFactory.CreateFileSystemFromExistingStream(testCollaborators.Stream);
using (DataStreamReadable stream = fileSystemReloaded.OpenFileForReading(@"\hey"))
{
Assert.AreEqual(streamLength, stream.Length);
var bytesRead = new byte[interestingBytes.Length];
for (int i = 0; i < numberOfGuidPortionsToReadAndWrite; i++)
{
int numberOfBytesRead = stream.Read(bytesRead, 0, interestingBytes.Length);
CollectionAssert.AreEqual(interestingBytes, bytesRead);
}
}
}
public void TryShrinkingTheStreamAndThenWritingReadingFromIt()
{
DataStreamReadableWritable dataStream = TestCollaboratorsFactory.CreateEmptyDataStream();
const int testArrayLength = 50000;
dataStream.SetLength(testArrayLength);
byte[] bytesToWrite = new byte[testArrayLength];
for (int i = 0; i < bytesToWrite.Length; i++)
{
bytesToWrite[i] = (byte)(i / 10000);
}
dataStream.Write(bytesToWrite, 0, bytesToWrite.Length);
ShrinkAndMakeSureDataIsIntact(dataStream, 40000);
ShrinkAndMakeSureDataIsIntact(dataStream, 34567);
ShrinkAndMakeSureDataIsIntact(dataStream, 25000);
ShrinkAndMakeSureDataIsIntact(dataStream, 9999);
ShrinkAndMakeSureDataIsIntact(dataStream, 24);
ShrinkAndMakeSureDataIsIntact(dataStream, 1);
}
public void MakeSureYouReadSameStuffFromTwoStreamsLinkingToTheSameFile()
{
VirtualFileSystem fileSystem = VirtualFileSystemFactory.CreateDefaultFileSystem();
FolderInfo folder1Node = fileSystem.CreateFolder(@"\folder1");
FileInfo newFile = fileSystem.CreateFile(@"\folder1\file1");
var relativelyInterestingData = new List <byte>();
for (int i = 0; i < 1000; i++)
{
relativelyInterestingData.AddRange(Guid.NewGuid().ToByteArray());
}
using (DataStreamReadableWritable dataStream = fileSystem.OpenFileForWriting(newFile.FullPath))
{
dataStream.Write(relativelyInterestingData.ToArray(), 0, relativelyInterestingData.Count);
}
DataStreamReadable dataStream1 = fileSystem.OpenFileForReading(newFile.FullPath);
DataStreamReadable dataStream2 = fileSystem.OpenFileForReading(newFile.FullPath);
Exception anyThreadException = null;
var bytesReadByThreadOne = new List <byte>();
var thread1 = new Thread(delegate()
{
try
{
var buffer = new byte[1];
while (dataStream1.Read(buffer, 0, 1) == 1)
{
bytesReadByThreadOne.Add(buffer[0]);
}
}
catch (Exception exception)
{
anyThreadException = new InvalidOperationException("", exception);
}
});
var bytesReadByThreadTwo = new List <byte>();
var thread2 = new Thread(delegate()
{
try
{
while (dataStream2.Position != dataStream2.Length)
{
var buffer = new byte[1];
dataStream2.Read(buffer, 0, 1);
bytesReadByThreadTwo.Add(buffer[0]);
}
}
catch (Exception exception)
{
anyThreadException = new InvalidOperationException("Возникло исключение в одном из тестовых потоков. Детали и стэк вызова - в обернутом исключении.", exception);
}
});
thread1.Start();
thread2.Start();
thread2.Join();
thread1.Join();
if (anyThreadException != null)
{
throw anyThreadException;
}
CollectionAssert.AreEqual(relativelyInterestingData, bytesReadByThreadOne);
CollectionAssert.AreEqual(relativelyInterestingData, bytesReadByThreadTwo);
}