/// <summary>
/// Initializes a COM-patible ONEVENTSTRUCT ready to be sent to subscribing clients
/// </summary>
/// <param name="oes"></param>
/// <param name="pOnEventClass"></param>
private void CopyToOnEventStruct(ref ONEVENTSTRUCT oes, OnEventClass pOnEventClass)
{
try
{
oes = pOnEventClass.InternalOES;
ReturnedAttributeList attrIds;
if (m_ReturnedAttributes.TryGetValue(oes.dwEventCategory, out attrIds) == true)
{
int retAttrCount = attrIds.Count;
int i = 0;
object[] attrVals = new object[retAttrCount];
foreach (int attrId in attrIds)
{
attrVals[i++] = pOnEventClass.EventAttributes[attrId];
}
oes.dwNumEventAttrs = retAttrCount;
oes.pEventAttributes = ComUtils.GetVARIANTs(attrVals, false);
}
}
catch (Exception e)
{
Utils.Trace(e, "Unexpected error in CopyToOnEventStruct");
}
}
/// <summary>
/// Called during incoming event processing and as a result of a client-initiated Refresh.
/// Forwards to each server instance for further processing.
/// </summary>
/// <param name="Source"></param>
/// <param name="Condition"></param>
/// <param name="cond"></param>
public void NotifyClients(string Source, string Condition, OPCCondition cond)
{
OnEventClass OEClass = new OnEventClass(Source, Condition, cond);
foreach (ComAeProxy s in m_EvServerSet)
{
s.ProcessNewEvent(OEClass);
}
}
/// <summary>
/// Determines whether the newly received event matches the filter applied to this
/// subscription.
/// </summary>
/// <param name="pOnEventClass"></param>
/// <returns></returns>
private bool MatchesFilter(OnEventClass pOnEventClass)
{
bool FilterMatches = true;
try
{
if (System.Convert.ToBoolean(m_dwEventType & pOnEventClass.InternalOES.dwEventType) == false)
{
FilterMatches = false;
}
if (m_EventCategoryVector.Count != 0)
{
if (m_EventCategoryVector.Contains(pOnEventClass.InternalOES.dwEventCategory) == false)
{
FilterMatches = false;
}
}
if (pOnEventClass.InternalOES.dwSeverity <m_dwLowSeverity | pOnEventClass.InternalOES.dwSeverity> m_dwHighSeverity)
{
FilterMatches = false;
}
if (m_AreaVector.Count != 0)
{
if (pOnEventClass.EventAttributes.Count > 0)
{
string[] areas = (string[])pOnEventClass.EventAttributes[1];
foreach (string area in areas)
{
if (m_AreaVector.Contains(area) == true)
{
FilterMatches = true;
break;
}
FilterMatches = false;
}
}
}
if (m_SourceVector.Count != 0)
{
if (m_SourceVector.Contains(pOnEventClass.InternalOES.szSource) == false)
{
FilterMatches = false;
}
}
}
catch (Exception e)
{
Utils.Trace(e, "Unexpected error in MatchesFilter");
FilterMatches = false;
}
return(FilterMatches);
}
/// <summary>
/// If the subscription filter allows the event then enqueue the event
/// and assign a threadpool worker to handle the subscription callback
/// </summary>
/// <param name="pOnEventClass"></param>
public void ProcessNewEvent(OnEventClass pOnEventClass)
{
lock (m_csData)
{
try
{
if (m_bActive == true)
{
// compare to my filter, if it matches
if (MatchesFilter(pOnEventClass))
{
m_OnEventQ.Enqueue(pOnEventClass);
}
// Just a keep-alive event?
else if ((pOnEventClass.InternalOES.szSource == null) && (pOnEventClass.InternalOES.szConditionName == null))
{
m_KeepAliveQ.EnqueueIfEmpty(pOnEventClass);
}
// Even if this event was filtered out, check to see if it
// is time to send anything that is already in my queue.
if (m_OnEventQ.Count > 0)
{
TimeSpan bufferTime = TimeSpan.FromMilliseconds(m_dwBufferTime);
DateTime lastUpdate = m_LastUpdateTime;
DateTime nextUpdate = lastUpdate + bufferTime;
if (m_OnEventQ.Count >= m_dwMaxSize || nextUpdate <= DateTime.Now)
{
ThreadPool.QueueUserWorkItem(new WaitCallback(ThreadWork), null);
}
}
// No "real events" to send ... is it time to send a keep alive (keepalive of 0 means disabled) ?
else if ((m_KeepAliveQ.Count > 0) && (m_KeepAliveTime != 0))
{
TimeSpan bufferTime = TimeSpan.FromMilliseconds(m_KeepAliveTime);
DateTime lastUpdate = m_LastUpdateTime;
if (DateTime.Now >= (lastUpdate + bufferTime))
{
ThreadPool.QueueUserWorkItem(new WaitCallback(ThreadWork), null);
}
}
}
}
catch (Exception e)
{
Utils.Trace(e, "Unexpected error in ProcessNewEvent");
}
}
}
/// <summary>
/// Force a refresh for all active conditions and inactive, unacknowledged conditions whose event notifications match the filter of the event subscription.
/// </summary>
/// <param name="dwConnection">The OLE Connection number returned from IConnectionPoint::Advise. This is passed to help the server determine which OPC event sink to call when the request completes.</param>
public void Refresh(int dwConnection)
{
try
{
if (m_RefreshID != 0 || m_RefreshQ.Count != 0)
{
throw ComUtils.CreateComException("Refresh", ResultIds.E_BUSY);
}
m_RefreshID = dwConnection;
// Foe each source walk through all associated conditions. If the condition is "refreshable", i.e. Active or
// inactive/unacknowledged, then create an event and push it on to the subscription's refresh queue
SourceMap sourceMap = SourceMap.TheSourceMap;
foreach (KeyValuePair <string, ConditionMap> kvp in sourceMap)
{
string sourceName = kvp.Key;
ConditionMap conditionMap = kvp.Value;
foreach (KeyValuePair <string, OPCCondition> kvpCond in conditionMap)
{
string conditionName = kvpCond.Key;
OPCCondition cond = kvpCond.Value;
if (cond.IsEnabled() && (cond.IsActive() || !cond.IsAcked()))
{
OnEventClass OEClass = new OnEventClass(sourceName, conditionName, cond);
if (MatchesFilter(OEClass))
{
m_RefreshQ.Enqueue(OEClass);
}
}
}
}
if (m_RefreshQ.Count > 0)
{
ThreadPool.QueueUserWorkItem(new WaitCallback(ThreadWork), null);
}
else
{
CancelRefresh(dwConnection);
}
}
catch (Exception e)
{
Utils.Trace(e, "Unexpected error in Refresh");
throw ComUtils.CreateComException(e);
}
}
