public Task StartReceive(CancellationToken cancellationToken = default)
{
maximumConcurrency = limitations.MaxConcurrency;
concurrencyLimiter = new SemaphoreSlim(maximumConcurrency, maximumConcurrency);
messagePumpCancellationTokenSource = new CancellationTokenSource();
messageProcessingCancellationTokenSource = new CancellationTokenSource();
circuitBreaker = new RepeatedFailuresOverTimeCircuitBreaker("AzureStorageQueue-MessagePump", TimeToWaitBeforeTriggering, ex => criticalErrorAction("Failed to receive message from Azure Storage Queue.", ex, messageProcessingCancellationTokenSource.Token));
Logger.DebugFormat($"Starting MessageReceiver {Id} with max concurrency: {0}", maximumConcurrency);
var receiverConfigurations = MessagePumpHelpers.DetermineReceiverConfiguration(receiveBatchSize, degreeOfReceiveParallelism, maximumConcurrency);
messagePumpTasks = new Task[receiverConfigurations.Count];
for (var i = 0; i < receiverConfigurations.Count; i++)
{
var backoffStrategy = new BackoffStrategy(peekInterval, maximumWaitTime);
var batchSizeForReceive = receiverConfigurations[i].BatchSize;
// Task.Run() so the call returns immediately instead of waiting for the first await or return down the call stack
messagePumpTasks[i] = Task.Run(() => PumpMessagesAndSwallowExceptions(batchSizeForReceive, backoffStrategy, messagePumpCancellationTokenSource.Token), CancellationToken.None);
}
return(Task.CompletedTask);
}
public Task Init(Func <MessageContext, Task> onMessage, Func <ErrorContext, Task <ErrorHandleResult> > onError, CriticalError criticalError, PushSettings settings)
{
circuitBreaker = new RepeatedFailuresOverTimeCircuitBreaker("AzureStorageQueue-MessagePump", TimeToWaitBeforeTriggering, ex => criticalError.Raise("Failed to receive message from Azure Storage Queue.", ex));
messageReceiver.PurgeOnStartup = settings.PurgeOnStartup;
receiveStrategy = ReceiveStrategy.BuildReceiveStrategy(onMessage, onError, settings.RequiredTransactionMode, criticalError);
return(messageReceiver.Init(settings.InputQueue, settings.ErrorQueue));
}
