public bool AddWrappedItem(object o, bool allowLinking = true)
{
if (o is T cast)
{
if (!_contains.Contains(cast))
{
WriterLock wl = null;
var wasEnableLinked = EnableLinking;
try
{
if (!allowLinking && EnableLinking)
{
wl = new WriterLock(_lock);
EnableLinking = false;
}
this.Add(cast);
}
finally
{
if (wl != null)
{
EnableLinking = wasEnableLinked;
wl.Dispose();
}
}
return(true);
}
}
return(false);
}
public IDisposable Write()
{
var locker = new WriterLock(this);
lock (_lockers) _lockers.Add(locker);
return(locker);
}
public void ClearListeners()
{
using (WriterLock wl = new WriterLock(listenerRWLock)) {
listenerEndPoints.Clear();
doSendDataValues = false;
}
}
public void RemoveListener(IPEndPoint ep)
{
// acquire a write lock
using (WriterLock wl = new WriterLock(listenerRWLock)) {
// add the end point if it doesn't exists already
listenerEndPoints.Remove(ep);
doSendDataValues = listenerEndPoints.Count > 0;
}
}
public void RegisterListener(IPEndPoint ep)
{
// acquire a write lock
using (WriterLock wl = new WriterLock(listenerRWLock)) {
// add the end point if it doesn't exists already
if (!listenerEndPoints.Contains(ep))
{
listenerEndPoints.Add(ep);
}
// indicate that we're now sending value
doSendDataValues = true;
}
}
public void WriterTimedOutIsSetIfTimeoutTimespan()
{
ReaderWriterLock rwLock = new ReaderWriterLock();
Thread t = new Thread(new ParameterizedThreadStart(AcquireReaderLock));
t.Start(rwLock);
Thread.Sleep(20);
using (WriterLock l = new WriterLock(rwLock, TimeSpan.FromMilliseconds(10)))
{
Assert.IsTrue(l.TimedOut);
}
Assert.IsFalse(rwLock.IsWriterLockHeld);
}
public static void Animate(Gdi::Image image, System.EventHandler onFrameChangedHandler)
{
if (image == null)
{
return;
}
ImageInfo item = null;
lock (image) item = new ImageInfo(image);
StopAnimate(image, onFrameChangedHandler);
WriterLock w_lock;
using (new WriterLockWait())
w_lock = new WriterLock(rwImgListLock);
using (w_lock){
if (!item.animated)
{
return;
}
if (imageInfoList == null)
{
imageInfoList = new Gen::List <ImageInfo>();
}
item.onFrameChangedHandler = onFrameChangedHandler;
imageInfoList.Add(item);
if (animationThread == null)
{
animationThread = new Thr::Thread(new Thr::ThreadStart(ImageAnimator.AnimateImages50ms));
animationThread.Name = typeof(ImageAnimator).Name;
animationThread.IsBackground = true;
animationThread.Start();
}
}
}
public static void StopAnimate(Gdi::Image image, System.EventHandler onFrameChangedHandler)
{
if (image == null || imageInfoList == null)
{
return;
}
WriterLock w_lock;
using (new WriterLockWait())
w_lock = new WriterLock(rwImgListLock);
using (w_lock){
ImageInfo item = imageInfoList.Find(delegate(ImageInfo info){ return(image == info.Image); });
if (item == null)
{
return;
}
if (onFrameChangedHandler == item.onFrameChangedHandler || onFrameChangedHandler != null && onFrameChangedHandler.Equals(item.onFrameChangedHandler))
{
imageInfoList.Remove(item);
}
}
}
public virtual bool SetValue(string propName, object value, Type preferredType = null, bool isRequired = false)
{
using (var wl = new WriterLock(_lock))
{
if (preferredType != null)
{
if (preferredType.IsValueType && !isRequired && !(preferredType.IsGenericType && preferredType.GetGenericTypeDefinition() == typeof(Nullable <>)))
{
preferredType = typeof(Nullable <>).MakeGenericType(preferredType);
}
_preferredType[propName] = preferredType;
}
if (_preferredType.TryGetValue(propName, out Type pt))
{
try
{
bool isnull = pt.IsGenericType && pt.GetGenericTypeDefinition() == typeof(Nullable <>);
if (value != null)
{
if (value.GetType() != pt && (!isnull || value.GetType() != Nullable.GetUnderlyingType(pt)))
{
if (value is IConvertible)
{
if (isnull)
{
value = InternalChangeType(value, Nullable.GetUnderlyingType(pt));
}
else
{
value = InternalChangeType(value, pt);
}
}
else
{
throw new InvalidCastException("Cannot coerce type.");
}
}
}
else
{
if (isnull)
{
value = pt.FastCreateNoParm();
}
}
}
catch
{
}
}
// Special case - if setting a property where there exists a shadow property already AND the new prop is NOT default - blow away the shadow property!
if (value != null && _shadowPropCount > 0 && propName[0] != KeyService.SHADOW_PROP_PREFIX && _valueBag.ContainsKey(KeyService.SHADOW_PROP_PREFIX + propName))
{
var defVal = WrappingHelper.GetDefaultForType(value.GetType());
if (!defVal.IsSame(value))
{
var k = KeyService.SHADOW_PROP_PREFIX + propName;
if (_valueBag.ContainsKey(k))
{
_valueBag.Remove(k);
_shadowPropCount--;
}
}
}
wl.Release();
if (_source != null)
{
var info = _source.FastGetAllProperties(true, true, propName);
if (info.Any())
{
wl.Reacquire();
var oldVal = _source.FastGetValue(propName);
if (!oldVal.IsSame(value))
{
_source.FastSetValue(propName, InternalChangeType(value, info.First().type));
wl.Release();
OnPropertyChanged(propName, oldVal, value, false);
return(true);
}
return(false);
}
}
wl.Reacquire();
if (_valueBag.ContainsKey(propName))
{
if (propName[0] != KeyService.SHADOW_PROP_PREFIX)
{
var oldVal = _valueBag[propName];
if (!oldVal.IsSame(value))
{
_isBagChanged = true;
_valueBag[propName] = value;
wl.Release();
OnPropertyChanged(propName, oldVal, value, true);
return(true);
}
}
return(false);
}
_valueBag[propName] = value;
if (propName[0] == KeyService.SHADOW_PROP_PREFIX)
{
_shadowPropCount++;
return(false);
}
_isBagChanged = true;
wl.Release();
OnPropertyChanged(propName, null, value, true);
return(true);
}
}
private void SenderThread()
{
// mark this thread as a background thread
Thread.CurrentThread.IsBackground = true;
Thread.CurrentThread.Name = "Dataset sender thread";
// keep track of client to remove
List <IPEndPoint> removeList = new List <IPEndPoint>();
// enter the send queue lock
Monitor.Enter(sendQueue);
while (true)
{
if (sendQueue.Count == 0)
{
Monitor.Wait(sendQueue);
}
// assume that now there is an entry in the queue
if (sendQueue.Count > 0)
{
// dequeue the entry
SendQueueEntry entry = sendQueue.Dequeue();
// fill up the buffer until we're at our target size
while (sendQueue.Count > 0)
{
SendQueueEntry nextEntry = sendQueue.Peek();
if (entry.length + nextEntry.length <= target_packet_size)
{
// add in this entry
// actually dequeue the entry
sendQueue.Dequeue();
// copy the next entry into our working buffer
Buffer.BlockCopy(nextEntry.buffer, 0, entry.buffer, entry.length, nextEntry.length);
// update the entry length
entry.length += nextEntry.length;
// free the next entry buffer
FreeBuffer(nextEntry.buffer);
}
else
{
// leave the loop, adding the next packet would go over the target size
break;
}
}
// increment the packet count and byte count
packetCount++;
// release the lock
Monitor.Exit(sendQueue);
try {
// acquire a reader lock
using (ReaderLock rl = new ReaderLock(listenerRWLock)) {
// clear the remove list
removeList.Clear();
// iterate through the listeners and send to each of them
foreach (IPEndPoint listener in listenerEndPoints)
{
try {
sender.SendTo(entry.buffer, entry.length, SocketFlags.None, listener);
byteCount += entry.length;
}
catch (Exception) {
// for any client error, add to the remove list
removeList.Add(listener);
}
}
// if there are listeners to remove, acquire a writer lock and remove them
// only wait for 20 milliseconds to get the writer lock to avoid blocking
using (WriterLock wl = rl.UpgradeToWriter(20)) {
foreach (IPEndPoint ep in removeList)
{
listenerEndPoints.Remove(ep);
}
}
doSendDataValues = listenerEndPoints.Count > 0;
}
}
catch (Exception) {
// ignore any exceptions
}
finally {
// re-enter the send queue lock
Monitor.Enter(sendQueue);
}
// free the buffer entry
FreeBuffer(entry.buffer);
}
}
}
public ReadWriteLock(LockRecursionPolicy policy = LockRecursionPolicy.SupportsRecursion)
{
_lock = new ReaderWriterLockSlim(policy);
_rlock = new ReaderLock(this);
_wlock = new WriterLock(this);
}
public void ClearListeners() {
using (WriterLock wl = new WriterLock(listenerRWLock)) {
listenerEndPoints.Clear();
doSendDataValues = false;
}
}
public void RemoveListener(IPEndPoint ep) {
// acquire a write lock
using (WriterLock wl = new WriterLock(listenerRWLock)) {
// add the end point if it doesn't exists already
listenerEndPoints.Remove(ep);
doSendDataValues = listenerEndPoints.Count > 0;
}
}
public void RegisterListener(IPEndPoint ep) {
// acquire a write lock
using (WriterLock wl = new WriterLock(listenerRWLock)) {
// add the end point if it doesn't exists already
if (!listenerEndPoints.Contains(ep)) {
listenerEndPoints.Add(ep);
}
// indicate that we're now sending value
doSendDataValues = true;
}
}
private void ReleaseWriterLock(WriterLock locker)
{
_lock.ReleaseWriterLock();
lock (_lockers) _lockers.Remove(locker);
}
