public ArrivalMessageQuery(WaitForMessageArrivalContext context)
{
sequenceSet = (!context.MessageArrived || context.Mailbox.ExistsMessage <= context.CurrentMessageCount)
? ImapSequenceSet.CreateSet(new long[0])
: ImapSequenceSet.CreateRangeSet(context.CurrentMessageCount + 1, context.Mailbox.ExistsMessage);
}
private bool WaitForMessageArrivalIdle(WaitForMessageArrivalContext context)
{
var waitHandles = new WaitHandle[] {context.AbortEvent, null};
for (;;) {
if (context.AbortEvent.WaitOne(0, false))
return false; // aborted
var idleAsyncResult = Client.Session.BeginIdle(context, delegate(object idleState, ImapUpdatedStatus updatedStatus) {
var ctx = idleState as WaitForMessageArrivalAsyncResult;
if (updatedStatus.Expunge.HasValue)
ctx.CurrentMessageCount--;
else if (updatedStatus.Exists.HasValue && ctx.CurrentMessageCount < updatedStatus.Exists.Value)
return false; // DONE
return true; // keep IDLEing
});
waitHandles[1] = idleAsyncResult.AsyncWaitHandle;
var index = WaitHandle.WaitAny(waitHandles, 180 * 1000, false); // send DONE 3 minute after IDLE started
ProcessResult(Client.Session.EndIdle(idleAsyncResult));
switch (index) {
case 0: // aborted
return false;
case 1: // IDLE completed
return true;
case WaitHandle.WaitTimeout:
default:
continue; // re-IDLE
}
}
}
private bool WaitForMessageArrivalNoOp(WaitForMessageArrivalContext context)
{
for (;;) {
if (context.AbortEvent.WaitOne(context.PollingInterval, false))
return false; // aborted
var result = ProcessResult(Client.Session.NoOp());
foreach (var response in result.ReceivedResponses) {
var dataResponse = response as ImapDataResponse;
if (dataResponse == null)
continue;
if (dataResponse.Type == ImapDataResponseType.Expunge)
context.CurrentMessageCount--;
}
if (context.CurrentMessageCount < context.Mailbox.ExistsMessage)
return true; // new message arrival
}
}
private ImapMessageInfoList GetArrivalMessages(WaitForMessageArrivalContext context)
{
try {
return new ImapMessageInfoList(this, context.FetchOptions, new ArrivalMessageQuery(context));
}
finally {
context.Dispose();
}
}
