public void SendAsync <T>(T methodObj, object methodState, Action <IMessageSentResult <T> > methodResultCallBack,
IServiceBusSerializer methodSerializer = null, IDictionary <string, object> methodMetadata = null)
{
Guard.ArgumentNotNull(methodObj, "obj");
Guard.ArgumentNotNull(methodResultCallBack, "resultCallBack");
methodSerializer = methodSerializer ?? configuration.DefaultSerializer.Create();
var sw = new Stopwatch();
sw.Start();
Action <T, object, Action <IMessageSentResult <T> >, IServiceBusSerializer, IDictionary <string, object> > sendAction = null;
sendAction = ((obj, state, resultCallBack, serializer, metadata) => {
IBrokeredMessage message = null;
Exception failureException = null;
bool resultSent = false; //I am not able to determine when the exception block is called.
// Use a retry policy to execute the Send action in an asynchronous and reliable fashion.
retryPolicy.ExecuteAction
(
(cb) => {
failureException = null; //we may retry so we must null out the error.
try {
// A new BrokeredMessage instance must be created each time we send it. Reusing the original BrokeredMessage instance may not
// work as the state of its BodyStream cannot be guaranteed to be readable from the beginning.
message = configurationFactory.MessageFactory.CreateBrokeredMessage(serializer.Serialize(obj));
message.MessageId = Guid.NewGuid().ToString();
message.Properties.Add(TYPE_HEADER_NAME, obj.GetType().FullName.Replace('.', '_'));
if (metadata != null)
{
foreach (var item in metadata)
{
message.Properties.Add(item.Key, item.Value);
}
}
logger.Debug("sendAction BeginSend Type={0} Serializer={1} MessageId={2}", obj.GetType().FullName, serializer.GetType().FullName, message.MessageId);
// Send the event asynchronously.
defaultClient.BeginSend(message, cb, null);
}
catch (Exception ex) {
failureException = ex;
throw;
}
},
(ar) => {
try {
failureException = null; //we may retry so we must null out the error.
// Complete the asynchronous operation. This may throw an exception that will be handled internally by the retry policy.
logger.Debug("sendAction EndSend Begin Type={0} Serializer={1} MessageId={2}", obj.GetType().FullName, serializer.GetType().FullName, message.MessageId);
defaultClient.EndSend(ar);
logger.Debug("sendAction EndSend End Type={0} Serializer={1} MessageId={2}", obj.GetType().FullName, serializer.GetType().FullName, message.MessageId);
}
catch (Exception ex) {
failureException = ex;
throw;
}
},
() => {
// Ensure that any resources allocated by a BrokeredMessage instance are released.
if (message != null)
{
message.Dispose();
message = null;
}
if (serializer != null)
{
serializer.Dispose();
serializer = null;
}
sw.Stop();
if (!resultSent)
{
resultSent = true;
ExtensionMethods.ExecuteAndReturn(() => resultCallBack(new MessageSentResult <T>()
{
IsSuccess = failureException == null,
State = state,
ThrownException = failureException,
TimeSpent = sw.Elapsed
}));
}
},
(ex) => {
// Always dispose the BrokeredMessage instance even if the send operation has completed unsuccessfully.
if (message != null)
{
message.Dispose();
message = null;
}
if (serializer != null)
{
serializer.Dispose();
serializer = null;
}
failureException = ex;
// Always log exceptions.
logger.Error <Exception>("Send failed {0}", ex);
sw.Stop();
//see if the reason is the topic was deleted and if it was, create the topic and set a new error since there will be no receivers.
var topicException = ex as MessagingEntityNotFoundException;
if (topicException != null && topicException.Detail != null && topicException.Detail.Message.IndexOf("40400") > -1)
{
logger.Info("Topic was deleted. Attempting to Recreate.");
EnsureTopic(this.configuration.TopicName, this.configuration.EnablePartitioning);
failureException = new TopicDeletedException();
logger.Info("Topic was deleted. Recreate Complete.");
}
if (!resultSent)
{
resultSent = true;
ExtensionMethods.ExecuteAndReturn(() => resultCallBack(new MessageSentResult <T>()
{
IsSuccess = failureException == null,
State = state,
ThrownException = failureException,
TimeSpent = sw.Elapsed
}));
}
}
); //asyc
}); //action
sendAction(methodObj, methodState, methodResultCallBack, methodSerializer, methodMetadata);
}
private void ProcessMessagesForSubscriptionLegacy()
{
try {
logger.Info("ProcessMessagesForSubscription Message Start {0} Declared {1} MessageTytpe {2}, IsReusable {3}", data.EndPointData.SubscriptionName,
data.EndPointData.DeclaredType.ToString(), data.EndPointData.MessageType.ToString(), data.EndPointData.IsReusable);
var gt = typeof(IReceivedMessage <>).MakeGenericType(data.EndPointData.MessageType);
var methodInfo = data.EndPointData.DeclaredType.GetMethod("Handle", new Type[] { gt });
var waitTimeout = TimeSpan.FromSeconds(30);
// Declare an action acting as a callback whenever a message arrives on a queue.
AsyncCallback completeReceive = null;
// Declare an action acting as a callback whenever a non-transient exception occurs while receiving or processing messages.
Action <Exception> recoverReceive = null;
// Declare an action implementing the main processing logic for received messages.
Action <AzureReceiveState> processMessage = ((receiveState) => {
// Put your custom processing logic here. DO NOT swallow any exceptions.
ProcessMessageCallBack(receiveState);
});
bool messageReceived = false;
bool lastAttemptWasError = false;
// Declare an action responsible for the core operations in the message receive loop.
Action receiveMessage = (() => {
// Use a retry policy to execute the Receive action in an asynchronous and reliable fashion.
retryPolicy.ExecuteAction
(
(cb) => {
if (lastAttemptWasError)
{
if (data.EndPointData.AttributeData.PauseTimeIfErrorWasThrown > 0)
{
Thread.Sleep(data.EndPointData.AttributeData.PauseTimeIfErrorWasThrown);
}
else
{
Thread.Sleep(1000);
}
}
// Start receiving a new message asynchronously.
data.Client.BeginReceive(waitTimeout, cb, null);
},
(ar) => {
messageReceived = false;
// Make sure we are not told to stop receiving while we were waiting for a new message.
if (!data.CancelToken.IsCancellationRequested)
{
IBrokeredMessage msg = null;
bool isError = false;
try {
// Complete the asynchronous operation. This may throw an exception that will be handled internally by retry policy.
msg = data.Client.EndReceive(ar);
// Check if we actually received any messages.
if (msg != null)
{
// Make sure we are not told to stop receiving while we were waiting for a new message.
if (!data.CancelToken.IsCancellationRequested)
{
// Process the received message.
messageReceived = true;
logger.Debug("ProcessMessagesForSubscription Start received new message: {0}", data.EndPointData.SubscriptionNameDebug);
var receiveState = new AzureReceiveState(data, methodInfo, serializer, msg);
processMessage(receiveState);
logger.Debug("ProcessMessagesForSubscription End received new message: {0}", data.EndPointData.SubscriptionNameDebug);
}
}
}
catch (Exception) {
isError = true;
throw;
}
finally {
// With PeekLock mode, we should mark the failed message as abandoned.
if (msg != null)
{
if (data.Client.Mode == ReceiveMode.PeekLock)
{
if (isError)
{
// Abandons a brokered message. This will cause Service Bus to unlock the message and make it available
// to be received again, either by the same consumer or by another completing consumer.
SafeAbandon(msg);
}
else
{
// Mark brokered message as completed at which point it's removed from the queue.
SafeComplete(msg);
}
}
msg.Dispose();
}
}
}
// Invoke a custom callback method to indicate that we have completed an iteration in the message receive loop.
completeReceive(ar);
},
() => {
//do nothing, we completed.
},
(ex) => {
// Invoke a custom action to indicate that we have encountered an exception and
// need further decision as to whether to continue receiving messages.
recoverReceive(ex);
});
});
// Initialize a custom action acting as a callback whenever a message arrives on a queue.
completeReceive = ((ar) => {
lastAttemptWasError = false;
if (!data.CancelToken.IsCancellationRequested)
{
// Continue receiving and processing new messages until we are told to stop.
receiveMessage();
}
else
{
data.SetMessageLoopCompleted();
}
if (messageReceived)
{
logger.Debug("ProcessMessagesForSubscription Message Complete={0} Declared={1} MessageTytpe={2} IsReusable={3}", data.EndPointData.SubscriptionName,
data.EndPointData.DeclaredType.ToString(), data.EndPointData.MessageType.ToString(), data.EndPointData.IsReusable);
}
});
// Initialize a custom action acting as a callback whenever a non-transient exception occurs while receiving or processing messages.
recoverReceive = ((ex) => {
// Just log an exception. Do not allow an unhandled exception to terminate the message receive loop abnormally.
lastAttemptWasError = true;
if (!data.CancelToken.IsCancellationRequested && typeof(ThreadAbortException) != ex.GetType())
{
//The subscription may have been deleted. If it was, then we want to recreate it.
var subException = ex as MessagingEntityNotFoundException;
if (subException != null && subException.Detail != null && subException.Detail.Message.IndexOf("40400") > -1)
{
logger.Info("Subscription was deleted. Attempting to Recreate.");
Configure(endpoint);
logger.Info("Subscription was deleted. Recreated.");
}
else
{
logger.Error(string.Format("ProcessMessagesForSubscription Message Error={0} Declared={1} MessageTytpe={2} IsReusable={3} Error={4}",
data.EndPointData.SubscriptionName,
data.EndPointData.DeclaredType.ToString(),
data.EndPointData.MessageType.ToString(),
data.EndPointData.IsReusable,
ex.ToString()));
}
// Continue receiving and processing new messages until we are told to stop regardless of any exceptions.
receiveMessage();
}
else
{
data.SetMessageLoopCompleted();
}
if (messageReceived)
{
logger.Debug("ProcessMessagesForSubscription Message Complete={0} Declared={1} MessageTytpe={2} IsReusable={3}", data.EndPointData.SubscriptionName,
data.EndPointData.DeclaredType.ToString(), data.EndPointData.MessageType.ToString(), data.EndPointData.IsReusable);
}
});
// Start receiving messages asynchronously.
receiveMessage();
}
catch (ThreadAbortException) {
//do nothing, let it exit
}
catch (Exception ex) {
failCounter++;
logger.Error("ProcessMessagesForSubscription: Error during receive during loop. See details and fix: {0}", ex);
if (failCounter < 100)
{
//try again
ProcessMessagesForSubscription();
}
}
}