/// <summary>
/// Attempts to find an agent available to serve a customer. The operation may time out if no agent
/// is available within a configurable max duration.
/// </summary>
internal IAsyncResult BeginFindAgent(AcdCustomerSession owner, List <Agent> exclusionList, List <AgentSkill> requestedSkills, AsyncCallback callback, object state)
{
var result = new FindAgentAsyncResult(callback, state, owner, this, exclusionList, requestedSkills);
ThreadPool.QueueUserWorkItem((waitState) =>
{
var tempAr = waitState as FindAgentAsyncResult;
tempAr.Process();
}, result);
return(result);
}
private void CleanupPendingRequests()
{
lock (_syncRoot)
{
//flush the queue of pending requests
foreach (PendingAgentMatchRequestQueueItem queueItem in _pendingAgentRequestQueueItems)
{
queueItem.StopTimer();
FindAgentAsyncResult asyncResult = queueItem.FindAgentAsyncResult;
if (null != asyncResult)
{
//Complete the async operation with failure
asyncResult.SetAsCompleted(new OperationFailureException("Acd Agent Match Maker is shutting down"), false);
}
}
}
}
internal PendingAgentMatchRequestQueueItem(AcdCustomerSession requestor, FindAgentAsyncResult findAgentAsyncResult, TimerItem tmrItem)
{
_Requestor = requestor;
this.FindAgentAsyncResult = findAgentAsyncResult;
_TmrItem = tmrItem;
}
/// <summary>
/// Determines whether an agent who becomes available has the correct skillset to be connected
/// to a customer who is waiting. If it does, the agent is allocated.
/// </summary>
internal void HandleNewAvailableAgent(Agent agent)
{
PendingAgentMatchRequestQueueItem pendingRequestToBeRemoved = null;
lock (_syncRoot)
{
foreach (PendingAgentMatchRequestQueueItem pendingRequestQueueItem in _pendingAgentRequestQueueItems)
{
// Retrieve the associated asyncResult from the item in the queue
FindAgentAsyncResult asyncResult = pendingRequestQueueItem.FindAgentAsyncResult;
if (null == asyncResult)
{
continue;
}
//Check if the agent is a match for the current pending request
if (asyncResult.IsAgentMatch(agent))
{
//It is a match, allocate the Agent
_logger.Log("Allocating Agent " + agent.SignInAddress);
try
{
//It is a match, allocate the Agent
agent.Allocate(pendingRequestQueueItem._Requestor);
_logger.Log("Agent " + agent.SignInAddress + " is allocated to :" + agent.Owner.ToString());
}
catch (InvalidOperationException ex)
{
//this is a race condition where an agent got allocated while the pending
// request was still in the queue
_logger.Log("AcdAgentMatchMaker failed allocation of Agent " + agent.SignInAddress, ex);
return;
}
// if we allocate the agent, we need to remove the pending request from the queue
pendingRequestToBeRemoved = pendingRequestQueueItem;
//Stop the timer
TimerItem tmrItem = pendingRequestQueueItem._TmrItem;
if (null != tmrItem)
{
tmrItem.Stop();
}
break;
}
}
//Attempt to remove the pending operation from the queue
//If it fails removing the pending request, the match maker is probably in terminating state
//in which case, shut down will take care of the clean up.
if (null != pendingRequestToBeRemoved)
{
//let's remove the pend operation first to ensure that the async result does not
//get executed twice in a row.
this.RemoveFromQueue(pendingRequestToBeRemoved);
//Complete the async operation with success
pendingRequestToBeRemoved.FindAgentAsyncResult.SetAsCompleted(agent, false);
}
}
}
/// <summary>
/// Completes the FindAgent Operation.
/// </summary>
internal Agent EndFindAgent(IAsyncResult result)
{
FindAgentAsyncResult asyncResult = result as FindAgentAsyncResult;
return(asyncResult.EndInvoke());
}
