private void SubscribeToProductEntitiesUpdatedQueue(string queueName)
{
var responseType = typeof(EntitiesChangedResponse <>);
//This is where we store the handlers to pass to busManager
HandlerManager handlerManager = new HandlerManager();
//Loop through entity types and create QueueMessageHandler of type
foreach (var entityType in EntityTypes.EntityBaseTypes)
{
//Get onRequest method with appropriate request and entity type
var entityResponseType = responseType.MakeGenericType(entityType);
var onResponseMethod = GenericHelpers.GetMethodExt(this.GetType(), "OnAllEntitiesUpdatedResponse", typeof(void), new Type[] { entityResponseType, typeof(MessageReceivedInfo) });
var onResponseMethodTyped = onResponseMethod.MakeGenericMethod(entityType);
//Create action delegate from typed onRequest method
var actionType = typeof(Action <,>).MakeGenericType(entityResponseType, typeof(MessageReceivedInfo));
var action = Delegate.CreateDelegate(actionType, this, onResponseMethodTyped);
//Create QueueMessageHandler of approriate type and pass in action and queueName
var queueMessageHandlerType = typeof(QueueMessageHandler <>).MakeGenericType(entityResponseType);
var accessor = TypeAccessor.Create(queueMessageHandlerType);
var queueMessageHandler = accessor.CreateNew();
accessor[queueMessageHandler, "Handler"] = action;
accessor[queueMessageHandler, "QueueName"] = queueName;
//Get AddHandler method from handlerManager to add appropriate request type and invoke
var addHandlerMethod = GenericHelpers.GetMethodExt(handlerManager.GetType(), "AddHandler", typeof(void), new Type[] { queueMessageHandlerType });
var addHandlerMethodTyped = addHandlerMethod.MakeGenericMethod(entityResponseType);
addHandlerMethodTyped.Invoke(handlerManager, new object[] { queueMessageHandler });
}
//Subscribe with our filled up handlerManager
_busManager.Subscribe(_busManager.TopicExchange, queueName, handlerManager);
}
private void SubscribeToEntityQueues()
{
//Add message handlers for all request types and entity types
foreach (var requestType in EntityTypes.EntityRequestTypes)
{
//This is where we store the handlers to pass to busManager
HandlerManager handlerManager = new HandlerManager();
//Do one queue/request type at a time
string requestQueue = null;
foreach (var entityType in EntityTypes.EntityBaseTypes)
{
//Get onRequest method (below) with appropriate request and entity type
var entityRequestType = requestType.MakeGenericType(entityType);
var onRequestMethod = GenericHelpers.GetMethodExt(this.GetType(), "OnRequest", typeof(void), new Type[] { requestType, typeof(MessageReceivedInfo) });
var onRequestMethodTyped = onRequestMethod.MakeGenericMethod(entityType);
//Create action delegate from typed onRequest method
var actionType = typeof(Action <,>).MakeGenericType(entityRequestType, typeof(MessageReceivedInfo));
var action = Delegate.CreateDelegate(actionType, this, onRequestMethodTyped);
//Instantiate a request of appropriate type to get at its request queue
if (requestQueue == null)
{
var requestAccessor = TypeAccessor.Create(entityRequestType);
var request = requestAccessor.CreateNew();
requestQueue = (string)requestAccessor[request, "RequestQueue"];
}
//Create QueueMessageHandler of approriate type and pass in action and queueName
var queueMessageHandlerType = typeof(QueueMessageHandler <>).MakeGenericType(entityRequestType);
var accessor = TypeAccessor.Create(queueMessageHandlerType);
var queueMessageHandler = accessor.CreateNew();
accessor[queueMessageHandler, "Handler"] = action;
accessor[queueMessageHandler, "QueueName"] = requestQueue;
//Get AddHandler method from handlerManager to add appropriate request type
var addHandlerMethod = GenericHelpers.GetMethodExt(handlerManager.GetType(), "AddHandler", typeof(void), new Type[] { queueMessageHandlerType });
var addHandlerMethodTyped = addHandlerMethod.MakeGenericMethod(entityRequestType);
addHandlerMethodTyped.Invoke(handlerManager, new object[] { queueMessageHandler });
}
//Subscribe with our filled up handlerManager
_busManager.Subscribe(_busManager.TopicExchange, requestQueue, handlerManager);
}
}
private IHandlerRegistration AddHandlers(IHandlerRegistration handlerReg, IQueue queue)
{
//This is gonna be a bit NASTY
//For this queue we need to find all the types we're currently holding handlers for
//then add the internal onMessageReceived handler for each type
//The reason for all this is calling consume on a queue with existing handlers for types
//wipes them out and we have to add all type handlers again - so each time a type is added to be subscribed to
//the whole previous set need to be re-added
foreach (Type requestType in EntityTypes.EntityRequestAndResponseTypes)
{
foreach (Type entityType in EntityTypes.EntityBaseTypes)
{
var requestWithEntityType = requestType.MakeGenericType(entityType);
var queueMessageHandlerType = typeof(QueueMessageHandler <>).MakeGenericType(requestWithEntityType);
var queueMessageHandlerList = GenericHelpers.InvokeGenericMethod(_handlerManager, requestWithEntityType, typeof(IList), "GetHandlersForType", queue.Name);
var list = queueMessageHandlerList as IList;
if (list != null && list.Count > 0)
{
var messageType = typeof(IMessage <>).MakeGenericType(requestWithEntityType);
var addParamType = typeof(Action <,>).MakeGenericType(messageType, typeof(MessageReceivedInfo));
var addMethod = GenericHelpers.GetMethodExt(handlerReg.GetType(), "Add", handlerReg.GetType(), addParamType);
var addMethodTyped = addMethod.MakeGenericMethod(requestWithEntityType);
var onMessageMethod = GenericHelpers.GetMethodExt(this.GetType(), "OnMessageReceived", typeof(void), new Type[] { messageType, typeof(MessageReceivedInfo) });
var onMessageMethodTyped = onMessageMethod.MakeGenericMethod(requestWithEntityType);
var action = Delegate.CreateDelegate(addParamType, this, onMessageMethodTyped);
handlerReg = (IHandlerRegistration)addMethodTyped.Invoke(handlerReg, new object[] { action });
}
}
}
return(handlerReg);
}
