public void Run(IBackgroundTaskInstance taskInstance)
{
if (taskInstance == null)
{
Diag.DebugPrint("KATask: taskInstance was null");
return;
}
Diag.DebugPrint("KATask " + taskInstance.Task.Name + " Starting...");
// Use the ControlChannelTriggerEventDetails object to derive the context for this background task.
// The context happens to be the channelId that apps can use to differentiate between
// various instances of the channel.
var channelEventArgs = (IControlChannelTriggerEventDetails)taskInstance.TriggerDetails;
ControlChannelTrigger channel = channelEventArgs.ControlChannelTrigger;
if (channel == null)
{
Diag.DebugPrint("Channel object may have been deleted.");
return;
}
string channelId = channel.ControlChannelTriggerId;
if (((IDictionary <string, object>)CoreApplication.Properties).ContainsKey(channelId))
{
try
{
AppContext appContext = null;
lock (CoreApplication.Properties)
{
appContext = ((IDictionary <string, object>)CoreApplication.Properties)[channelId] as AppContext;
}
if (appContext != null && appContext.CommunicationInstance != null)
{
CommunicationModule communicationModule = appContext.CommunicationInstance;
Task <bool> result;
lock (communicationModule)
{
result = communicationModule.SendKAMessage(GetType().Name);
}
if (result != null && result.Result == true)
{
// Call FlushTransport on the channel object to ensure
// the packet is out of the process and on the wire before
// exiting the keepalive task.
communicationModule.channel.FlushTransport();
}
else
{
// Socket has not been set up. reconnect the transport and plug in to the ControlChannelTrigger object.
communicationModule.Reset();
// Create CCT enabled transport.
communicationModule.SetUpTransport(communicationModule.serverUri, GetType().Name);
}
}
}
catch (Exception ex)
{
Diag.DebugPrint("KA Task failed with: " + ex.ToString());
}
}
else
{
Diag.DebugPrint("Cannot find AppContext key channelOne");
}
Diag.DebugPrint("KATask " + taskInstance.Task.Name + " finished.");
}