message-queue | 易学教程

RabbitMQ - Message order of delivery

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I need to choose a new Queue broker for my new project. This time I need a scalable queue that supports pub/sub, and keeping message ordering is a must. I read Alexis comment: He writes: "Indeed, we think RabbitMQ provides stronger ordering than Kafka" I read the message ordering section in rabbitmq docs: "Messages can be returned to the queue using AMQP methods that feature a requeue parameter (basic.recover, basic.reject and basic.nack), or due to a channel closing while holding unacknowledged messages...With release 2.7.0 and later it is still possible for individual consumers to observe

Why must SetWindowsHookEx be used with a windows message queue

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问题 I\'ve been trying some things with hooks, and I don\'t understand why hooks must be used with a message queue hook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardProc, NULL, 0); MSG msg; while(GetMessage(&msg, NULL, 0, 0) > 0) { TranslateMessage(&msg); DispatchMessage(&msg); } UnhookWindowsHookEx(hook); Why doesn\'t something like this work ? hook = SetWindowsHookEx(WH_KEYBOARD, KeyboardProc, NULL, 0); cin >> aKey; UnhookWindowsHookEx(hook); Using boost threads, and a barrier doesn\'t work either

What is the relationship between Looper, Handler and MessageQueue in Android?

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问题 I have checked the official Android documentation/guide for Looper , Handler and MessageQueue . But I couldn\'t get it. I am new to android, and got very confused with these concepts. 回答1: A Looper is a message handling loop: it reads and processes items from a MessageQueue. The Looper class is usually used in conjunction with a HandlerThread (a subclass of Thread ). A Handler is a utility class that facilitates interacting with a Looper —mainly by posting messages and Runnable objects to the

What exactly is a Node.js event loop tick?

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问题 I\'ve been getting more into the internals of the Node.js architecture, and a term I see coming up a lot is \"tick\" as in \"next tick of the event loop\" or the function nextTick(). What I haven\'t seen is a solid definition of what exactly a \"tick\" is. Based on various articles (such as this one), I\'ve been able to piece a concept together in my head, but I\'m not sure how accurate it is. Can I get a precise and detailed description of a Node.js event loop tick? 回答1: Remember that while

RabbitMQ - Message order of delivery

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问题 I need to choose a new Queue broker for my new project. This time I need a scalable queue that supports pub/sub, and keeping message ordering is a must. I read Alexis comment: He writes: \"Indeed, we think RabbitMQ provides stronger ordering than Kafka\" I read the message ordering section in rabbitmq docs: \"Messages can be returned to the queue using AMQP methods that feature a requeue parameter (basic.recover, basic.reject and basic.nack), or due to a channel closing while holding

ActiveMQ or RabbitMQ or ZeroMQ or [closed]

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We'd be interested to hear any experiences with the pros and cons of ActiveMQ vs RabbitMQ vs ZeroMQ. Information about any other interesting message queues is also welcome. Julien Edit: My initial answer had a strong focus on AMQP. I decided to rewrite it to offer a wider view on the topic. These 3 messaging technologies have different approaches on building distributed systems : RabbitMQ is one of the leading implementation of the AMQP protocol (along with Apache Qpid). Therefore, it implements a broker architecture, meaning that messages are queued on a central node before being sent to

ActiveMQ or RabbitMQ or ZeroMQ or [closed]

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问题 We\'d be interested to hear any experiences with the pros and cons of ActiveMQ vs RabbitMQ vs ZeroMQ. Information about any other interesting message queues is also welcome. 回答1: Edit: My initial answer had a strong focus on AMQP. I decided to rewrite it to offer a wider view on the topic. These 3 messaging technologies have different approaches on building distributed systems : RabbitMQ is one of the leading implementation of the AMQP protocol (along with Apache Qpid). Therefore, it

How to post messages to an STA thread running a message pump?

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问题 So, following this, I decided to explicitly instantiate a COM object on a dedicated STA thread. Experiments showed that the COM object needed a message pump, which I created by calling Application.Run() : private MyComObj _myComObj; // Called from Main(): Thread myStaThread = new Thread(() => { _myComObj = new MyComObj(); _myComObj.SomethingHappenedEvent += OnSomthingHappened; Application.Run(); }); myStaThread.SetApartmentState(ApartmentState.STA); myStaThread.Start(); How do I post messages