/// <summary>
/// Gets the SeeingSharpMessenger by the given name.
/// </summary>
/// <param name="messengerName">The name of the messenger.</param>
public static SeeingSharpMessenger TryGetByName(string messengerName)
{
messengerName.EnsureNotNullOrEmpty(nameof(messengerName));
SeeingSharpMessenger result = null;
s_messengersByName.TryGetValue(messengerName, out result);
return(result);
}
/// <summary>
/// Clears all synchronization options.
/// </summary>
public void DiscardGlobalSynchronization()
{
if (string.IsNullOrEmpty(m_messengerName))
{
return;
}
SeeingSharpMessenger dummyResult = null;
s_messengersByName.TryRemove(m_messengerName, out dummyResult);
m_checkBehavior = SeeingSharpMessageThreadingBehavior.Ignore;
m_messengerName = string.Empty;
m_syncContext = null;
}
/// <summary>
/// Sends the given message to all subscribers (synchonous processing).
/// </summary>
/// <typeparam name="MessageType">Type of the message.</typeparam>
/// <param name="message">The message to send.</param>
/// <param name="isInitialCall">Is this one the initial call to publish? (false if we are coming from async routing)</param>
private void PublishInternal <MessageType>(
MessageType message, bool isInitialCall)
where MessageType : SeeingSharpMessage
{
message.EnsureNotNull(nameof(message));
try
{
// Check whether publich is possible
if (m_checkBehavior == SeeingSharpMessageThreadingBehavior.EnsureMainSyncContextOnSyncCalls)
{
if (!CompareSynchronizationContexts())
{
throw new SeeingSharpException(
"Unable to perform a synchronous publish call because current " +
"SynchronizationContext is set wrong. This indicates that the call " +
"comes from a wrong thread!");
}
}
// Notify all subscribed targets
Type currentType = typeof(MessageType);
// Check for correct message sources
if (isInitialCall)
{
string[] possibleSources = s_messageSources.GetOrAdd(currentType, (inputType) => message.GetPossibleSourceThreads());
if (possibleSources.Length > 0)
{
string mainThreadName = m_messengerName;
if (string.IsNullOrEmpty(mainThreadName) ||
(Array.IndexOf(possibleSources, mainThreadName) < 0))
{
throw new InvalidOperationException(string.Format(
"The message of type {0} can only be sent by the threads {1}. This Messenger belongs to the thread {2}, so no publish possible!",
currentType.FullName,
possibleSources.ToCommaSeparatedString(),
!string.IsNullOrEmpty(mainThreadName) ? mainThreadName as string : "(empty)"));
}
}
}
// Perform synchronous message handling
List <MessageSubscription> subscriptionsToTrigger = new List <MessageSubscription>(20);
lock (m_messageSubscriptionsLock)
{
if (m_messageSubscriptions.ContainsKey(currentType))
{
// Need to copy the list to avoid problems, when the list is changed during the loop and cross thread accesses
subscriptionsToTrigger = new List <MessageSubscription>(m_messageSubscriptions[currentType]);
}
}
// Trigger all found subscriptions
List <Exception> occurredExceptions = null;
for (int loop = 0; loop < subscriptionsToTrigger.Count; loop++)
{
try
{
subscriptionsToTrigger[loop].Publish(message);
}
catch (Exception ex)
{
if (occurredExceptions == null)
{
occurredExceptions = new List <Exception>();
}
occurredExceptions.Add(ex);
}
}
// Perform further message routing if enabled
if (isInitialCall)
{
// Get information about message routing
string[] asyncTargets = s_messagesAsyncTargets.GetOrAdd(currentType, (inputType) => message.GetAsyncRoutingTargetThreads());
string mainThreadName = m_messengerName;
for (int loop = 0; loop < asyncTargets.Length; loop++)
{
string actAsyncTargetName = asyncTargets[loop];
if (mainThreadName == actAsyncTargetName)
{
continue;
}
SeeingSharpMessenger actAsyncTargetHandler = null;
if (s_messengersByName.TryGetValue(actAsyncTargetName, out actAsyncTargetHandler))
{
SynchronizationContext actSyncContext = actAsyncTargetHandler.m_syncContext;
if (actSyncContext == null)
{
continue;
}
SeeingSharpMessenger innerHandlerForAsyncCall = actAsyncTargetHandler;
actSyncContext.PostAlsoIfNull(() =>
{
innerHandlerForAsyncCall.PublishInternal(message, false);
});
}
}
}
// Notify all exceptions occurred during publish progress
if (isInitialCall)
{
if ((occurredExceptions != null) &&
(occurredExceptions.Count > 0))
{
throw new MessagePublishException(typeof(MessageType), occurredExceptions);
}
}
}
catch (Exception ex)
{
// Check whether we have to throw the exception globally
var globalExceptionHandler = SeeingSharpMessenger.CustomPublishExceptionHandler;
bool doRaise = true;
if (globalExceptionHandler != null)
{
try
{
doRaise = !globalExceptionHandler(this, ex);
}
catch
{
doRaise = true;
}
}
// Raise the exception to inform caller about it
if (doRaise)
{
throw;
}
}
}
/// <summary>
/// Clears this message.
/// </summary>
internal void Clear()
{
m_Messenger = null;
m_messageType = null;
m_targetHandler = null;
}
/// <summary>
/// Initializes a new instance of the <see cref="MessageSubscription"/> class.
/// </summary>
/// <param name="Messenger">The messenger.</param>
/// <param name="messageType">Type of the message.</param>
/// <param name="targetHandler">The target handler.</param>
internal MessageSubscription(SeeingSharpMessenger Messenger, Type messageType, Delegate targetHandler)
{
m_Messenger = Messenger;
m_messageType = messageType;
m_targetHandler = targetHandler;
}
private async void ObjectThreadMainMethod()
#endif
{
try
{
Stopwatch stopWatch = new Stopwatch();
stopWatch.Start();
//Set synchronization context for this thread
m_syncContext = new ObjectThreadSynchronizationContext(this);
#if DESKTOP
SynchronizationContext.SetSynchronizationContext(m_syncContext);
#endif
// Do create the messenger if configured
if (m_createMessenger)
{
m_Messenger = new SeeingSharpMessenger();
m_Messenger.ApplyForGlobalSynchronization(this);
}
//Notify start process
try { OnStarting(EventArgs.Empty); }
catch (Exception ex)
{
OnThreadException(new ObjectThreadExceptionEventArgs(m_currentState, ex));
m_currentState = ObjectThreadState.None;
return;
}
//Run main-thread
if (m_currentState != ObjectThreadState.None)
{
m_currentState = ObjectThreadState.Running;
while (m_currentState == ObjectThreadState.Running)
{
try
{
//Wait for next action to perform
#if DESKTOP
m_mainLoopSynchronizeObject.Wait(m_heartBeat);
#else
await m_mainLoopSynchronizeObject.WaitAsync(m_heartBeat);
#endif
//Measure current time
stopWatch.Stop();
m_timer.Add(stopWatch.Elapsed);
stopWatch.Reset();
stopWatch.Start();
//Get current taskqueue
List <Action> localTaskQueue = new List <Action>();
Action dummyAction = null;
while (m_taskQueue.TryDequeue(out dummyAction))
{
localTaskQueue.Add(dummyAction);
}
//Execute all tasks
foreach (Action actTask in localTaskQueue)
{
try { actTask(); }
catch (Exception ex)
{
OnThreadException(new ObjectThreadExceptionEventArgs(m_currentState, ex));
}
}
//Perfoms a tick
OnTick(EventArgs.Empty);
}
catch (Exception ex)
{
OnThreadException(new ObjectThreadExceptionEventArgs(m_currentState, ex));
}
}
//Notify stop process
try { OnStopping(EventArgs.Empty); }
catch (Exception ex)
{
OnThreadException(new ObjectThreadExceptionEventArgs(m_currentState, ex));
}
}
//Reset state to none
m_currentState = ObjectThreadState.None;
stopWatch.Stop();
stopWatch = null;
}
catch (Exception ex)
{
OnThreadException(new ObjectThreadExceptionEventArgs(m_currentState, ex));
m_currentState = ObjectThreadState.None;
}
// Notify thread stop event
try { m_threadStopSynchronizeObject.Release(); }
catch (Exception) { }
}
