/// <summary>
/// Add a subscription for a specific event
/// </summary>
/// <param name="eventType">EventType being subscribed to</param>
/// <param name="localOnly">Specifies if subscription is only for local machine or global</param>
/// <param name="methodBody">String containing the method body defining the filter</param>
/// <param name="usingLibraries">List of using libraries which the method requires, null if none required</param>
/// <param name="referencedAssemblies">List of referenced assemblies which the method requires, null if none required</param>
public void AddSubscription(Guid eventType, bool localOnly, string methodBody, List <string> usingLibraries, List <string> referencedAssemblies)
{
ReturnCode rc;
Subscription subscription = new Subscription();
subscription.SubscriptionEventType = eventType;
subscription.Subscribe = true;
subscription.LocalOnly = localOnly;
subscription.MethodBody = methodBody;
subscription.UsingLibraries = usingLibraries;
subscription.ReferencedAssemblies = referencedAssemblies;
WspEvent wspEvent = new WspEvent(Subscription.SubscriptionEvent, null, subscription.Serialize());
publishMgr.Publish(wspEvent.SerializedEvent, out rc);
Dictionary <string, Subscription> subscriptionFilter;
if (subscriptions.TryGetValue(eventType, out subscriptionFilter) == false)
{
subscriptions[eventType] = new Dictionary <string, Subscription>();
}
subscriptions[eventType][methodBody] = subscription;
}
/// <summary>
/// Remove a subscription for a specific event
/// </summary>
/// <param name="eventType">EventType being unsubscribed to</param>
/// <param name="localOnly">Specifies if subscription is only for local machine or global</param>
/// <param name="methodBody">String containing the method body defining the filter</param>
/// <param name="usingLibraries">List of using libraries which the method requires, null if none required</param>
/// <param name="referencedAssemblies">List of referenced assemblies which the method requires, null if none required</param>
/// <returns>True if successful</returns>
public bool RemoveSubscription(Guid eventType, bool localOnly, string methodBody, List <string> usingLibraries, List <string> referencedAssemblies)
{
ReturnCode rc;
Subscription subscription = null;
Dictionary <string, Subscription> subscriptionFilter;
if (subscriptions.TryGetValue(eventType, out subscriptionFilter) == true)
{
if (subscriptionFilter.TryGetValue(methodBody, out subscription) == true)
{
subscription.Subscribe = false;
WspEvent wspEvent = new WspEvent(Subscription.SubscriptionEvent, null, subscription.Serialize());
publishMgr.Publish(wspEvent.SerializedEvent, out rc);
subscriptionFilter.Remove(methodBody);
if (subscriptionFilter.Count == 0)
{
subscriptions.Remove(eventType);
}
}
}
return(true);
}
/// <summary>
/// Dequeues events from shared memory
/// </summary>
internal void Listener()
{
WspEvent wspEvent;
DateTime nextPushSubscriptions = DateTime.UtcNow.AddMinutes(subscriptionRefreshIncrement);
ReturnCode rc;
try
{
Thread.CurrentThread.Priority = ThreadPriority.Highest;
byte[] buffer = null;
while (StopListening == false)
{
try
{
buffer = eventQueue.Dequeue(Timeout);
if (buffer != null)
{
try
{
wspEvent = new WspEvent(buffer);
}
catch (Exception e)
{
EventLog.WriteEntry("WspEventRouter", "Event has invalid format: " + e.ToString(), EventLogEntryType.Error);
continue;
}
List <WspEventObservable> observables;
if (WspEventObservable.eventObservables.TryGetValue(wspEvent.EventType, out observables) == true)
{
for (int i = 0; i < observables.Count; i++)
{
observables[i].queue.Enqueue(wspEvent, wspEvent.SerializedEvent.Length);
}
}
}
if (DateTime.UtcNow > nextPushSubscriptions)
{
try
{
foreach (Guid subId in subscriptions.Keys)
{
foreach (string expression in subscriptions[subId].Keys)
{
WspEvent subEvent = new WspEvent(Subscription.SubscriptionEvent, null, subscriptions[subId][expression].Serialize());
publishMgr.Publish(subEvent.SerializedEvent, out rc);
}
}
nextPushSubscriptions = DateTime.UtcNow.AddMinutes(subscriptionRefreshIncrement);
}
catch
{
// intentionally left blank
// it will retry next time
}
}
}
catch (PubSubException e)
{
EventLog.WriteEntry("WspEventRouter", "Exception occurred processing event from shared queue: " + e.ToString(), EventLogEntryType.Error);
continue;
}
catch (Exception e)
{
EventLog.WriteEntry("WspEventRouter", "Exception occurred processing event from shared queue: " + e.ToString(), EventLogEntryType.Error);
continue;
}
}
}
catch (ThreadAbortException)
{
// Another thread has signalled that this worker
// thread must terminate. Typically, this occurs when
// the main service thread receives a service stop
// command.
}
catch (AccessViolationException)
{
// This can occur after the thread has been stopped and the runtime is doing GC.
// Just let the thread quit to end listening.
}
catch (SharedQueueException e)
{
throw new PubSubException(e.Message, e.InnerException);
}
}
/// <summary>
/// Base contructor to deserialize a byte array into a WspEvent object
/// </summary>
/// <param name="serializationData">Serialized WspEvent</param>
/// <param name="inRouterNameArray">A UTF-8 encoded byte array of the InRouterName </param>
/// <param name="inRouterName">Name of the router that the event was passed in from</param>
public static WspEvent ChangeInRouterName(byte[] serializationData, byte[] inRouterNameArray, string inRouterName)
{
WspEvent wspEvent = new WspEvent();
int position = 0;
int positionOfInRouterName = 0;
Int32 oldTotalLength;
Int32 newTotalLength;
Int32 oldHeaderLength = 0;
Int32 newHeaderLength = 0;
Int32 oldInRouterNameLength = 0;
Int32 bodyLength;
HeaderType headerType;
Int32 valueLength;
oldTotalLength = Read(serializationData, ref position);
oldHeaderLength = Read(serializationData, ref position);
Int32 headerLength = oldHeaderLength + sizeof(Int32) + sizeof(Int32);
while (position < headerLength)
{
headerType = (HeaderType)serializationData[position];
position++;
valueLength = Read(serializationData, ref position);
if (headerType == HeaderType.InRouterName)
{
oldInRouterNameLength = valueLength;
positionOfInRouterName = position;
wspEvent.Headers[(byte)headerType] = inRouterName;
Read(serializationData, ref position, valueLength);
}
else
{
wspEvent.Headers[(byte)headerType] = Read(serializationData, ref position, valueLength);
}
}
bodyLength = Read(serializationData, ref position);
wspEvent.Body = new byte[bodyLength];
Buffer.BlockCopy(serializationData, position, wspEvent.Body, 0, bodyLength);
wspEvent.EventType = new Guid(wspEvent.Headers[(byte)HeaderType.EventType]);
wspEvent.OriginatingRouterName = wspEvent.Headers[(byte)HeaderType.OriginatingRouter];
wspEvent.InRouterName = wspEvent.Headers[(byte)HeaderType.InRouterName];
wspEvent.Version = new Version(wspEvent.Headers[(byte)HeaderType.Version]);
wspEvent.TimeStamp = long.Parse(wspEvent.Headers[(byte)HeaderType.UtcTimestamp]);
newTotalLength = oldTotalLength + (inRouterNameArray.Length - oldInRouterNameLength);
newHeaderLength = oldHeaderLength + (inRouterNameArray.Length - oldInRouterNameLength);
wspEvent.SerializedEvent = new byte[newTotalLength];
int location = 0;
int copyLength;
Buffer.BlockCopy(BitConverter.GetBytes((Int32)newTotalLength), 0, wspEvent.SerializedEvent, location, sizeof(Int32));
location += sizeof(Int32);
Buffer.BlockCopy(BitConverter.GetBytes((Int32)newHeaderLength), 0, wspEvent.SerializedEvent, location, sizeof(Int32));
location += sizeof(Int32);
copyLength = positionOfInRouterName - sizeof(Int32) - location;
Buffer.BlockCopy(serializationData, location, wspEvent.SerializedEvent, location, copyLength);
location += copyLength;
Buffer.BlockCopy(BitConverter.GetBytes((Int32)inRouterNameArray.Length), 0, wspEvent.SerializedEvent, location, sizeof(Int32));
location += sizeof(Int32);
Buffer.BlockCopy(inRouterNameArray, 0, wspEvent.SerializedEvent, location, inRouterNameArray.Length);
location += inRouterNameArray.Length;
copyLength = newTotalLength - location;
Buffer.BlockCopy(serializationData, oldTotalLength - copyLength, wspEvent.SerializedEvent, location, copyLength);
location += copyLength;
return(wspEvent);
}
