public ContactWatcher(Dispatcher dispatcher, ContactLoader loader, string directory, ContactWatcherEventCallback callback)
{
// Assert here rather than dynamically generate these arrays. This class should include all the supported types.
Assert.AreEqual(Contact.GetExtensionsFromType(ContactTypes.All).Split('|').Length, _Types.Length);
var watchers = new ContactWatcherSingular[_Types.Length];
try
{
for (int i = 0; i < _Types.Length; ++i)
{
watchers[i] = new ContactWatcherSingular(dispatcher, loader, directory, _Types[i], callback);
}
_watchers = watchers;
watchers = null;
}
finally
{
if (null != watchers)
{
foreach (ContactWatcherSingular watcher in watchers)
{
if (null != watcher)
{
watcher.Dispose();
}
}
}
}
}
public ContactWatcherSingular(Dispatcher dispatcher, ContactLoader loader, string directory, ContactTypes type, ContactWatcherEventCallback callback)
{
Assert.IsNotNull(dispatcher);
// It's expected that this is created on the same thread as the manager,
// so don't need to go through the dispatcher for methods invoked in the constructor.
Assert.IsTrue(dispatcher.CheckAccess());
Assert.IsNotNull(loader);
Assert.IsFalse(string.IsNullOrEmpty(directory));
Assert.IsNotNull(callback);
Assert.IsTrue(Enum.IsDefined(typeof(ContactTypes), type));
Assert.AreNotEqual(ContactTypes.All, type);
Assert.AreNotEqual(ContactTypes.None, type);
_dispatcher = dispatcher;
_rootDirectory = directory;
_loader = loader;
_notify = callback;
_findExtension = "*" + Contact.GetExtensionsFromType(type);
// This is why creating this object is expensive:
// In order to be able to give accurate change notifications we need to know all the contacts that are present at the beginning.
_knownContacts = new Dictionary<string, ContactInfo>();
// _pushedFrames = 0;
_frame = new DispatcherFrame
{
Continue = false
};
// Create the timer, but only signal it if we're going to need to reprocess an update.
_timer = new Timer();
_timer.Tick += delegate
{
if (!_stopProcessing)
{
// Not invoked by the FileSystemWatcher, so don't push a frame here.
_dispatcher.Invoke(DispatcherPriority.Background, (ThreadStart)_ReprocessPendingUpdate);
}
};
_timer.Interval = TimeSpan.FromMilliseconds(_TimerMsDelay);
_timer.IsEnabled = false;
_PopulateKnownContacts(type);
_fileWatch = new FileSystemWatcher(_rootDirectory, _findExtension)
{
IncludeSubdirectories = true,
NotifyFilter = NotifyFilters.FileName | NotifyFilters.LastWrite | NotifyFilters.Attributes,
};
// There's some extra indirection required here because the manager requires thread affinity.
_fileWatch.Changed += FileSystemWatcher_OnChanged;
_fileWatch.Created += FileSystemWatcher_OnCreated;
_fileWatch.Deleted += FileSystemWatcher_OnDeleted;
_fileWatch.Renamed += FileSystemWatcher_OnRenamed;
_fileWatch.EnableRaisingEvents = true;
}