messaging

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 6 years ago . I am trying to figure out exactly how I can capture all window messages of a process/window, from the time it was launched in c#. The process would not be my own so I would need to use some kind of hook. My goal is to start capturing all messages in real time from before the

问题 Is there a relatively simple way that my VB.NET application can be notified of the fact that a new value has been written to a table in SQL Server Express 2008? Polling is not an option since I'd need to do that every 10 seconds nonstop. 回答1: Take a look at having your application subscribe to Query Notifications. Also Using Query Notifications in .NET 2.0 to handle ad-hoc data refreshes 来源： https://stackoverflow.com/questions/6617278/how-can-sqlserver-notify-a-vb-net-application-of-an-event

问题 I have a C# app that subscribes to a topic on our messaging system for value updates. When a new value comes in, I do some processing and then carry on. The problem is, the updates can come faster than the app can process them. What I want to do is to just hold on to the latest value, so I don't want a queue. For example, the source publishes value "1" and my app receives it; while processing, the source publishes the sequence (2, 3, 4, 5) before my app is done processing; my app then

问题 I want to use pub-sub messaging between multiple servers in a web farm to maintain their local (ASP.NET) caches in sync. Could this be easily done with SignalR? If it is possible, how can I do so? 来源： https://stackoverflow.com/questions/9449601/does-signalr-support-the-publish-subscribe-messaging-paradigm

问题 A recent presentation I saw regarding RabbitMQ mentioned the use of something called an "idempotency barrier" for message de-duplication. Is this just a fancy name for a message conflator or is it something more specific. If so, what exactly is it? A google search yielded results which are mostly related to RabbitMQ, with little explanation of what it was. 回答1: Idempotency is the behavior of a function where performing the function on the function's output n times results in the same state as

问题 I was poking around the rabbitmq documentation, and it seems that rabbitmq does not handle message redelivery count. If I were to manually ACK/NACK messages, I would need to either keep the retry count in memory (say, by using correlationId as the unique key in a map), or by setting my own header in the message, and redelivering it (thus putting it at the end of the queue) However, this is a case that spring handles. Specifically, I am referring to RetryInterceptorBuilder.stateful()

问题 Is it possible to guarantee ordered delivery when using WCF netMSMQbinding? We are putting an insert command followed by a number of update commands on the same queue, and occassionally one of the updates beats the insert. Having added extensive logging it is clear that they are being added to the queue in the correct order and being processed in a different order. I have managed to Google a couple of articles that state that this behaviour is expected, but it seems like it must be possible

问题 I am looking to be able to move messages between queues (manually) in Rabbit. For example: first-queue has messages ['a','b','c','d','e','f'] second-queue has messages ['x','y'] I want to be able to move for example message 'a' to second-queue from first-queue. This can be a manual operation. Both queues are on the same broker, and I do not want to send them through any exchange. Is there anyway to do this? I have been playing with rabbitmqctl but can't seem to get it to work. I am open to

问题 I'm trying to find a way to re-order messages within a topic partition and send ordered messages to a new topic. I have Kafka publisher that sends String messages of the following format: {system_timestamp}-{event_name}?{parameters} for example: 1494002667893-client.message?chatName=1c&messageBody=hello 1494002656558-chat.started?chatName=1c&chatPatricipants=3 Also, we add some message key for each message, to send them to the corresponding partition. What I want to do is reorder events based

问题 I'm trying to find a way to re-order messages within a topic partition and send ordered messages to a new topic. I have Kafka publisher that sends String messages of the following format: {system_timestamp}-{event_name}?{parameters} for example: 1494002667893-client.message?chatName=1c&messageBody=hello 1494002656558-chat.started?chatName=1c&chatPatricipants=3 Also, we add some message key for each message, to send them to the corresponding partition. What I want to do is reorder events based