private void When_changing_InternalBufferSize_on_running_watcher_it_must_discard_old_notifications_and_restart()
{
// Arrange
const string directoryToWatch = @"c:\some";
string pathToFileToUpdate1 = Path.Combine(directoryToWatch, "file1.txt");
string pathToFileToUpdate2 = Path.Combine(directoryToWatch, "file2.txt");
FakeFileSystem fileSystem = new FakeFileSystemBuilder()
.IncludingEmptyFile(pathToFileToUpdate1)
.IncludingEmptyFile(pathToFileToUpdate2)
.Build();
var lockObject = new object();
bool isFirstEventInvocation = true;
FileSystemEventArgs argsAfterRestart = null;
var resumeEventHandlerWaitHandle = new ManualResetEventSlim(false);
var testCompletionWaitHandle = new ManualResetEventSlim(false);
using (FakeFileSystemWatcher watcher = fileSystem.ConstructFileSystemWatcher(directoryToWatch))
{
watcher.NotifyFilter = TestNotifyFilters.All;
watcher.Changed += (sender, args) =>
{
lock (lockObject)
{
if (isFirstEventInvocation)
{
// Wait for all change notifications on file1.txt and file2.txt to queue up.
resumeEventHandlerWaitHandle.Wait(MaxTestDurationInMilliseconds);
isFirstEventInvocation = false;
}
else
{
// After event handler for first change on file1 has completed, no additional
// changes on file1.txt should be raised because they have become outdated.
argsAfterRestart = args;
testCompletionWaitHandle.Set();
}
}
};
watcher.EnableRaisingEvents = true;
fileSystem.File.SetAttributes(pathToFileToUpdate1, FileAttributes.Hidden);
fileSystem.File.SetAttributes(pathToFileToUpdate1, FileAttributes.ReadOnly);
fileSystem.File.SetAttributes(pathToFileToUpdate1, FileAttributes.System);
Thread.Sleep(SleepTimeToEnsureOperationHasArrivedAtWatcherConsumerLoop);
// Act
watcher.InternalBufferSize = watcher.InternalBufferSize * 2;
fileSystem.File.SetAttributes(pathToFileToUpdate2, FileAttributes.Hidden);
resumeEventHandlerWaitHandle.Set();
bool signaled = testCompletionWaitHandle.Wait(MaxTestDurationInMilliseconds);
signaled.Should().BeTrue();
lock (lockObject)
{
// Assert
FileSystemEventArgs argsAfterRestartNotNull = argsAfterRestart.ShouldNotBeNull();
argsAfterRestartNotNull.Name.Should().Be("file2.txt");
}
}
}
private void When_changing_notify_filter_on_running_watcher_it_must_discard_old_notifications_and_restart()
{
// Arrange
const string directoryToWatch = @"c:\some";
string pathToFileToDelete1 = Path.Combine(directoryToWatch, "file1.txt");
string pathToFileToDelete2 = Path.Combine(directoryToWatch, "file2.txt");
string pathToFileToDelete3 = Path.Combine(directoryToWatch, "file3.txt");
FakeFileSystem fileSystem = new FakeFileSystemBuilder()
.IncludingEmptyFile(pathToFileToDelete1)
.IncludingEmptyFile(pathToFileToDelete2)
.IncludingEmptyFile(pathToFileToDelete3)
.Build();
var lockObject = new object();
bool isFirstEventInvocation = true;
FileSystemEventArgs argsAfterRestart = null;
var resumeEventHandlerWaitHandle = new ManualResetEventSlim(false);
var testCompletionWaitHandle = new ManualResetEventSlim(false);
using (FakeFileSystemWatcher watcher = fileSystem.ConstructFileSystemWatcher(directoryToWatch))
{
watcher.NotifyFilter = NotifyFilters.FileName | NotifyFilters.Attributes;
watcher.Deleted += (sender, args) =>
{
lock (lockObject)
{
if (isFirstEventInvocation)
{
// Wait for delete notifications on all files to queue up.
resumeEventHandlerWaitHandle.Wait(MaxTestDurationInMilliseconds);
isFirstEventInvocation = false;
}
else
{
// After event handler for file1 has completed, no event for
// file2 should be raised because it has become outdated.
argsAfterRestart = args;
testCompletionWaitHandle.Set();
}
}
};
watcher.EnableRaisingEvents = true;
fileSystem.File.Delete(pathToFileToDelete1);
fileSystem.File.Delete(pathToFileToDelete2);
Thread.Sleep(SleepTimeToEnsureOperationHasArrivedAtWatcherConsumerLoop);
// Act
watcher.NotifyFilter = NotifyFilters.FileName | NotifyFilters.DirectoryName;
fileSystem.File.Delete(pathToFileToDelete3);
resumeEventHandlerWaitHandle.Set();
testCompletionWaitHandle.Wait(MaxTestDurationInMilliseconds);
lock (lockObject)
{
// Assert
FileSystemEventArgs argsAfterRestartNotNull = argsAfterRestart.ShouldNotBeNull();
argsAfterRestartNotNull.Name.Should().Be("file3.txt");
}
}
}