public void ReturnsNullIfApplicationFolderIsNotAccessible()
{
var folder = new StubPlatformFolder { OnGetFiles = () => { throw new UnauthorizedAccessException(); } };
var provider = new StubApplicationFolderProvider { OnGetApplicationFolder = () => folder };
var storage = new TransmissionStorage(provider);
Transmission result = storage.Dequeue();
Assert.Null(result);
}
public void SkipsTransmissionFileAlreadyLoadedByAnotherThreadAndTriesLoadingNextFile()
{
var files = new List<IPlatformFile>();
StubPlatformFile loadedFile = CreateTransmissionFile();
loadedFile.OnRename = newName =>
{
files.Remove(loadedFile);
throw new FileNotFoundException();
};
StubPlatformFile nextFile = CreateTransmissionFile();
files.Add(loadedFile);
files.Add(nextFile);
var folder = new StubPlatformFolder { OnGetFiles = () => files };
var provider = new StubApplicationFolderProvider { OnGetApplicationFolder = () => folder };
var storage = new TransmissionStorage(provider);
Transmission dequeued = storage.Dequeue();
Assert.NotNull(dequeued);
}
public void SkipsTransmissionFileBeingCurrentlyLoadedByAnotherThreadAndTriesLoadingNextFile()
{
var files = new List<IPlatformFile>();
StubPlatformFile fileBeingLoadedByAnotherThread = CreateTransmissionFile();
fileBeingLoadedByAnotherThread.OnRename = newName =>
{
files.Remove(fileBeingLoadedByAnotherThread);
throw new UnauthorizedAccessException();
};
StubPlatformFile nextFile = CreateTransmissionFile();
files.Add(fileBeingLoadedByAnotherThread);
files.Add(nextFile);
var folder = new StubPlatformFolder { OnGetFiles = () => files };
var provider = new StubApplicationFolderProvider { OnGetApplicationFolder = () => folder };
var storage = new TransmissionStorage(provider);
Transmission dequeued = storage.Dequeue();
Assert.NotNull(dequeued);
}
public void GetsMultipleFilesFromFolderOnceAndCachesThemToReduceDiskAccess()
{
int numberOfGetFilesAsyncCalls = 0;
var files = new StubPlatformFile[] { CreateTransmissionFile(), CreateTransmissionFile() };
var folder = new StubPlatformFolder();
folder.OnGetFiles = () =>
{
numberOfGetFilesAsyncCalls += 1;
return files;
};
var provider = new StubApplicationFolderProvider { OnGetApplicationFolder = () => folder };
var storage = new TransmissionStorage(provider);
Assert.NotNull(storage.Dequeue());
Assert.NotNull(storage.Dequeue());
Assert.Equal(2, numberOfGetFilesAsyncCalls); // 1 for initializing size and 1 for 1 dequeue
}
public void DoesNotCacheSameFilesTwiceWhenIvokedByMultipleThreads()
{
int numberOfGetFilesAsyncCalls = 0;
var returnFiles = new ManualResetEventSlim();
var files = new StubPlatformFile[] { CreateTransmissionFile(), CreateTransmissionFile() };
var folder = new StubPlatformFolder();
folder.OnGetFiles = () =>
{
numberOfGetFilesAsyncCalls += 1;
returnFiles.Wait();
return files;
};
var provider = new StubApplicationFolderProvider { OnGetApplicationFolder = () => folder };
var storage = new TransmissionStorage(provider);
Task<Transmission> dequeue1 = TaskEx.Run(() => storage.Dequeue());
Task<Transmission> dequeue2 = TaskEx.Run(() => storage.Dequeue());
returnFiles.Set();
TaskEx.WhenAll(dequeue1, dequeue2).GetAwaiter().GetResult();
Assert.Equal(2, numberOfGetFilesAsyncCalls); // 1 for initializing size and 1 for 1 dequeue
}
public void ReturnsFalseDoesNotEnqueueIfProcessHasNoRightToListFilesInApplicationFolder()
{
var folder = new StubPlatformFolder { OnGetFiles = () => { throw new UnauthorizedAccessException(); } };
var provider = new StubApplicationFolderProvider { OnGetApplicationFolder = () => folder };
var storage = new TransmissionStorage(provider);
storage.Enqueue(() => new StubTransmission());
bool result = storage.Enqueue(() => new StubTransmission());
Assert.False(result);
}
public void ReturnsFalseIfProcessHasNoRightToWriteToFilesInApplicationFolder()
{
var file = new StubPlatformFile { OnOpen = () => { throw new UnauthorizedAccessException(); } };
var folder = new StubPlatformFolder { OnCreateFile = name => file };
var provider = new StubApplicationFolderProvider { OnGetApplicationFolder = () => folder };
var storage = new TransmissionStorage(provider);
bool result = storage.Enqueue(() => new StubTransmission());
Assert.False(result);
}
public void ChangesTemporaryExtensionToPermanentToMakeFileAvailableForDequeueAsync()
{
string permanentFileName = null;
StubPlatformFile file = CreateFile("TemporaryFile");
file.OnRename = desiredName => permanentFileName = desiredName;
var folder = new StubPlatformFolder { OnCreateFile = fileName => file };
var provider = new StubApplicationFolderProvider { OnGetApplicationFolder = () => folder };
var storage = new TransmissionStorage(provider);
storage.Enqueue(() => new StubTransmission());
Assert.True(permanentFileName.EndsWith(TransmissionStorage.TransmissionFileExtension, StringComparison.OrdinalIgnoreCase));
}
public void ClosesFileStreamToEnsureChangesAreCommittedToDisk()
{
bool fileStreamDisposed = false;
var fileStream = new StubStream { OnDispose = disposing => fileStreamDisposed = true };
var file = new StubPlatformFile { OnOpen = () => fileStream };
var folder = new StubPlatformFolder { OnCreateFile = fileName => file };
var provider = new StubApplicationFolderProvider { OnGetApplicationFolder = () => folder };
var storage = new TransmissionStorage(provider);
storage.Enqueue(() => new StubTransmission());
Assert.True(fileStreamDisposed);
}
public void SavesTransmissionToTheNewlyCreatedFile()
{
string writtenContents = null;
StubStream fileStream = new StubStream();
fileStream.OnDispose = disposing =>
{
writtenContents = Encoding.UTF8.GetString(fileStream.ToArray());
};
var file = new StubPlatformFile { OnOpen = () => fileStream };
var folder = new StubPlatformFolder { OnCreateFile = fileName => file };
var provider = new StubApplicationFolderProvider { OnGetApplicationFolder = () => folder };
var storage = new TransmissionStorage(provider);
byte[] contents = Encoding.UTF8.GetBytes(Path.GetRandomFileName());
var transmission = new StubTransmission(contents);
storage.Enqueue(() => transmission);
string encodedContent = writtenContents.Split(Environment.NewLine.ToCharArray()).Last();
Assert.Equal(contents, Convert.FromBase64String(encodedContent));
}
public void CreatesFilesWithUniqueNamesToPreventConflictsWithOtherThreads()
{
var actualFileNames = new List<string>();
var folder = new StubPlatformFolder
{
OnCreateFile = fileName =>
{
actualFileNames.Add(fileName);
return new StubPlatformFile();
}
};
var provider = new StubApplicationFolderProvider { OnGetApplicationFolder = () => folder };
var storage = new TransmissionStorage(provider);
storage.Enqueue(() => new StubTransmission());
storage.Enqueue(() => new StubTransmission());
Assert.NotEqual(actualFileNames[0], actualFileNames[1]);
}
public void CreatesNewFileWithTemporaryExtensionToPreventConflictsWithDequeueAsync()
{
string temporaryFileName = null;
var folder = new StubPlatformFolder
{
OnCreateFile = fileName =>
{
temporaryFileName = fileName;
return new StubPlatformFile();
}
};
var provider = new StubApplicationFolderProvider { OnGetApplicationFolder = () => folder };
var storage = new TransmissionStorage(provider);
storage.Enqueue(() => new StubTransmission());
Assert.True(temporaryFileName.EndsWith(TransmissionStorage.TemporaryFileExtension, StringComparison.OrdinalIgnoreCase));
}
