private ISimpleQueueListener AttachService(string storageAccountConnectionString, object service)
{
// Search interfaces for 'QueuedServiceAttribute' def and get name
string name = (from interfaceType in service.GetType().GetInterfaces()
let attr = interfaceType.GetCustomAttributes(typeof (QueuedServiceAttribute), false)
where attr.Any()
select ((QueuedServiceAttribute) attr[0]).Name ?? interfaceType.Name).FirstOrDefault();
if(name == null)
{
throw new InvalidOperationException("Service type '" + service.GetType().Name + "' must inherit from an interface marked with the [QueuedService] attribute");
}
var location = new CloudQueueDescription { QueueName = name, StorageAccount = storageAccountConnectionString };
var listener = new CloudQueueListenerExtension<QueueMessage>(location, _component);
return new AzureSimpleQueueListener(listener, service);
}
/// <summary>
/// Extends the OnStart phase that is called by Windows Azure runtime to initialize the role instance.
/// </summary>
/// <returns>True if initialization succeeds, otherwise false.</returns>
protected override bool OnRoleStart()
{
this.EnsureExists <WorkItemProcessorConfigurationExtension>();
this.EnsureExists <WorkQueueLocationResolverExtension>();
this.EnsureExists <ScalableTransformServiceClientExtension>();
this.EnsureExists <EndpointConfigurationDiscoveryExtension>();
this.EnsureExists <RulesEngineServiceClientExtension>();
this.EnsureExists <InterRoleEventSubscriberExtension>();
IWorkItemProcessorConfigurationExtension configSettingsExtension = Extensions.Find <IWorkItemProcessorConfigurationExtension>();
IEndpointConfigurationDiscoveryExtension discoveryExtension = Extensions.Find <IEndpointConfigurationDiscoveryExtension>();
IInterRoleCommunicationExtension interCommExtension = Extensions.Find <IInterRoleCommunicationExtension>();
IInterRoleEventSubscriberExtension interCommSubscriber = Extensions.Find <IInterRoleEventSubscriberExtension>();
CloudQueueLocation inputQueueLocation = new CloudQueueLocation()
{
StorageAccount = configSettingsExtension.Settings.CloudStorageAccount,
QueueName = configSettingsExtension.Settings.WorkItemQueue,
VisibilityTimeout = configSettingsExtension.Settings.WorkItemQueueVisibilityTimeout
};
CloudQueueLocation outputQueueLocation = new CloudQueueLocation()
{
StorageAccount = configSettingsExtension.Settings.CloudStorageAccount,
QueueName = configSettingsExtension.Settings.OutputQueue,
VisibilityTimeout = configSettingsExtension.Settings.OutputQueueVisibilityTimeout
};
// Instantiate queue listeners.
var inputQueueListener = new CloudQueueListenerExtension <XDocument>(inputQueueLocation);
var outputQueueListener = new CloudQueueListenerExtension <XDocument>(outputQueueLocation);
// Configure the input queue listener.
inputQueueListener.QueueEmpty += HandleQueueEmptyEvent;
inputQueueListener.DequeueBatchSize = configSettingsExtension.Settings.DequeueBatchSize;
inputQueueListener.DequeueInterval = configSettingsExtension.Settings.MinimumIdleInterval;
// Configure the output queue listener.
outputQueueListener.QueueEmpty += HandleQueueEmptyEvent;
outputQueueListener.DequeueBatchSize = configSettingsExtension.Settings.DequeueBatchSize;
outputQueueListener.DequeueInterval = configSettingsExtension.Settings.MinimumIdleInterval;
// Instantiate queue subscribers.
InputQueueSubscriberExtension inputQueueSubscriber = new InputQueueSubscriberExtension();
OutputQueueSubscriberExtension outputQueueSubscriber = new OutputQueueSubscriberExtension();
// Register subscribers with queue listeners.
inputQueueListener.Subscribe(inputQueueSubscriber);
outputQueueListener.Subscribe(outputQueueSubscriber);
// Register custom extensions for this worker role.
Extensions.Add(inputQueueSubscriber);
Extensions.Add(outputQueueSubscriber);
Extensions.Add(outputQueueListener);
Extensions.Add(inputQueueListener);
var contractTypeMatchCondition = ServiceEndpointDiscoveryCondition.ContractTypeExactMatch(typeof(IScalableTransformationServiceContract));
var bindingTypeMatchCondition = ServiceEndpointDiscoveryCondition.BindingTypeExactMatch(typeof(NetTcpRelayBinding));
discoveryExtension.RegisterDiscoveryAction(new[] { contractTypeMatchCondition, bindingTypeMatchCondition }, (endpoint) =>
{
NetTcpRelayBinding relayBinding = endpoint.Binding as NetTcpRelayBinding;
if (relayBinding != null)
{
relayBinding.TransferMode = TransferMode.Streamed;
}
});
// Register a subscriber for all inter-role communication events.
if (interCommExtension != null && interCommSubscriber != null)
{
this.interCommSubscription = interCommExtension.Subscribe(interCommSubscriber);
}
return(true);
}
