public void Creation()
{
var listener = new LocalSiteModelChangeListener(new SiteModelChangeProcessorItemHandler());
listener.Should().NotBeNull();
listener.Handler.Should().NotBeNull();
}
public void Creation_NoHandler()
{
Action act = () =>
{
var _ = new LocalSiteModelChangeListener(null);
};
act.Should().Throw <ArgumentException>().WithMessage("Listener must be supplied with a handler");
}
public void OnEvent_AcceptedEvent(CacheEntryEventType evtType, bool expectedToBeAccepted)
{
var mockEvent = new Mock <ICacheEntryEvent <ISiteModelChangeBufferQueueKey, ISiteModelChangeBufferQueueItem> >();
mockEvent.Setup(x => x.EventType).Returns(evtType);
using (var handler = new SiteModelChangeProcessorItemHandler())
{
var listener = new LocalSiteModelChangeListener(handler);
listener.OnEvent(new List <ICacheEntryEvent <ISiteModelChangeBufferQueueKey, ISiteModelChangeBufferQueueItem> > {
mockEvent.Object
});
// the listener should have placed the event in to the handler
handler.QueueCount.Should().Be(expectedToBeAccepted ? 1 : 0);
}
}
/// <summary>
/// Executes the life cycle of the service until it is aborted
/// </summary>
public void Execute(IServiceContext context)
{
try
{
if (_log == null)
{
Console.WriteLine($"Error: Null logger present in {nameof(SiteModelChangeProcessorService)}.{nameof(Execute)}");
}
_log.LogInformation($"{context.Name} starting executing");
Aborted = false;
_waitHandle = new EventWaitHandle(false, EventResetMode.AutoReset);
// Get the ignite grid and cache references
var ignite = DIContext.Obtain <ITRexGridFactory>()?.Grid(StorageMutability.Immutable) ??
Ignition.GetIgnite(TRexGrids.ImmutableGridName());
if (ignite == null)
{
_log.LogError("Ignite reference in service is null - aborting service execution");
return;
}
// Don't start operations until the local (immutable) grid is confirmed as active
DIContext.ObtainRequired <IActivatePersistentGridServer>().WaitUntilGridActive(TRexGrids.ImmutableGridName());
// Once active, delay start of operations for a time to ensure everything is up and running
var delay = DIContext.ObtainRequired <IConfigurationStore>().GetValueInt("TREX_SITE_MODEL_CHANGE_MAP_SERVICE_OPERATION_START_DELAY_SECONDS", 120);
_log.LogInformation($"Delaying start of operations for {delay} seconds");
Thread.Sleep(delay * 1000);
_log.LogInformation("Obtaining queue cache reference");
var queueCache = ignite.GetCache <ISiteModelChangeBufferQueueKey, ISiteModelChangeBufferQueueItem>(TRexCaches.SiteModelChangeBufferQueueCacheName());
_log.LogInformation($"Obtained queue cache for SiteModelChangeBufferQueueKey: {queueCache}");
var handler = new SiteModelChangeProcessorItemHandler();
var listener = new LocalSiteModelChangeListener(handler);
// Obtain the query handle for the continuous query from the DI context, or if not available create it directly
// Construct the continuous query machinery
// Set the initial query to return all elements in the cache
// Instantiate the queryHandle and start the continuous query on the remote nodes
// Note: Only cache items held on this local node will be handled here
var queryHandleFactory = DIContext.Obtain <Func <LocalSiteModelChangeListener, IContinuousQueryHandle <ICacheEntry <ISiteModelChangeBufferQueueKey, ISiteModelChangeBufferQueueItem> > > >();
if (queryHandleFactory != null)
{
_log.LogInformation("Obtaining query handle from DI factory");
_queryHandle = queryHandleFactory(listener);
}
while (_queryHandle == null && !Aborted)
{
_log.LogInformation("Obtaining query handle from QueryContinuous() API");
try
{
_queryHandle = queueCache.QueryContinuous
(qry: new ContinuousQuery <ISiteModelChangeBufferQueueKey, ISiteModelChangeBufferQueueItem>(listener)
{
Local = true
},
initialQry: new ScanQuery <ISiteModelChangeBufferQueueKey, ISiteModelChangeBufferQueueItem> {
Local = true
});
}
catch (Exception e)
{
_log.LogError(e, "Exception while constructing continuous query, will sleep and retry");
Thread.Sleep(5000);
}
}
if (_queryHandle == null || Aborted)
{
_log.LogInformation("No query handle available, or aborting");
return;
}
using (_queryHandle)
{
_log.LogInformation("Performing initial continuous query cursor scan of items to process");
// Perform the initial query to grab all existing elements and process them. Make sure to sort them in time order first
_queryHandle.GetInitialQueryCursor().OrderBy(x => x.Key.InsertUTCTicks).ForEach(handler.Add);
while (!Aborted)
{
try
{
{
// Cycle looking for new work to do as items arrive until aborted...
_log.LogInformation("Entering steady state continuous query scan of items to process");
// Activate the handler with the inject initial continuous query and move into steady state processing
InSteadyState = true;
handler.Activate();
do
{
_waitHandle.WaitOne(_serviceCheckIntervalMs);
} while (!Aborted);
}
}
catch (Exception e)
{
_log.LogError(e, "Site model change processor service unhandled exception, waiting and trying again");
// Sleep for 5 seconds to see if things come right and then try again
Thread.Sleep(5000);
}
}
}
handler.Cancel();
}
catch (Exception e)
{
_log.LogError(e, "Exception occurred performing initial set up of continuous query and scan of existing items");
}
finally
{
_log.LogInformation($"{context.Name} completed executing");
}
}
