messaging

问题 How does AMQP overcome the difficulties of using TCP directly when sending messages? Or more specifically in a pub/sub scenario? 回答1: In AMQP there is a broker, that broker receives the messages and then does the hard part about routing them to exchanges and queues. You can also setup durable queues which save the messages for clients even when they are disconnected. You could certainly do all this yourself, but it's a tremendous amount of work to do correctly. RabbitMQ in particular has been

问题 Hey! I'd like to know which is the intent android sends when it sends a message. And how can I listen for this intent in my application. I wanted that, when I send a message in native android messaging, my application listen this intent, so it will know a new message has been sent. So, which one is it, and how to listen for this intent? Thanks. 回答1: I believe the Intent is: public static final String SMS_RECEIVED_ACTION = "android.provider.Telephony.SMS_SENT"; This guy had an article about

问题 I'm working on a Chrome extension to (among other things) support a page with multiple iframes, each of which loads a page from some other domain. I need to send a msg to the page loaded a specific one of those iframes. The top-level page and the pages in the iframe each have their own content scripts, so the full messaging API is available. From the top page, when I do chrome.runtime.sendMessage(), all the iframes get it (as does the top window, but it's easy for its content script to know

问题 I'm using this tutorial to get internal messages working on my site: http://www.novawave.net/public/rails_messaging_tutorial.html But, since my latest upgrade to Rails 3, I'm getting this error: NoMethodError in MsgController#sendmsg undefined method `each' for #<String:0xcc8acc0> Application trace: app/models/message.rb:16:in `prepare_copies' app/controllers/msg_controller.rb:140:in `sendmsg' The Message model: class Message < ActiveRecord::Base belongs_to :author, :class_name => "User" has

问题 I'm replacing some homegrown code with Celery, but having a hard time replicating the current behaviour. My desired behaviour is as follows: When creating a new user, a message should be published to the tasks exchange with the user.created routing key. Two Celery tasks should be trigged by this message, namely send_user_activate_email and check_spam . I tried implementing this by defining a user_created task with a ignore_result=True argument, plus a task for send_user_activate_email and

问题 I'm hoping that Ruby's message-passing infrastructure means there might be some clever trick for this. How do I determine the calling object -- which object called the method I'm currently in? 回答1: As an option, there is a binding_of_caller gem that allows you to execute code in context of any caller on the call stack (caller, caller's caller and so on). It's useful for inspecting (read do anything at any position on the call stack ) call stack in development, as used in better_errors.

问题 What exactly is going on inside this Win32 messaging loop? I understand that TranslateMessage is converting keycodes to UTF char codes and sending the WM_CHAR event, but what is the call to PeekMessage doing exactly? Is it filtering out a certain type of message and only translating those? // Application / Player message loop. MSG msg; ZeroMemory(&msg, sizeof(msg)); while(msg.message != WM_QUIT) { if (PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE)) { TranslateMessage(&msg); DispatchMessage(&msg);

问题 I have created a Microsoft Edge Extension with native messaging but I cannot make it work with non-persistent connections. The example given here is not useful in my particular case: The example (Random Number Generator) shows how two UWP applications can communicate where the client communicates with the server when the server is already running. In Edge Extensions with Native Messaging (and mine is based on the Digital Signing and Secure Input examples), I have a W32 applications where the

问题 In my extension, different content scripts connect to background.js to communicate with each other. The problem I'm having, is that when I receive a message on one port, I am not able to forward this information to the other port. The error I'm getting is: Error: Attempting to use a disconnected port object My code in background.js chrome.runtime.onConnect.addListener(function(port) { if(port.name === "menuport") { port.onMessage.addListener(function(msg) { console.log('BGJS from menuport')

问题 I have some problem with signalR, I can not send message to specific User From Hub. I want to do like this: public void Send(string userToId, string userForId, string message) { IHubContext context = GlobalHost.ConnectionManager.GetHubContext<ChatHubs>(); //userForId - it is Session["UserId"] context.Clients.User(userForId).updateMessages(message); } I have already read this topic: http://www.asp.net/signalr/overview/guide-to-the-api/mapping-users-to-connections , but It's not clear for me,