queue

问题 What is the easiest way to create a delay (or parking) queue with Python, Pika and RabbitMQ? I have seen an similar questions, but none for Python. I find this an useful idea when designing applications, as it allows us to throttle messages that needs to be re-queued again. There are always the possibility that you will receive more messages than you can handle, maybe the HTTP server is slow, or the database is under too much stress. I also found it very useful when something went wrong in

问题 I'm trying to put std::string s into boost::lockfree::queue s so that my threads can update each other with new data. When I try to use boost::lockfree::queue<std::string> updated_data; , g++ says : In instantiation of 'class boost::lockfree::queue >': error: static assertion failed: (boost::has_trivial_destructor::value) error: static assertion failed: (boost::has_trivial_assign::value) I've been shown generally what these errors mean, but I have no hope of ever fixing this myself, as I'm

问题 I need to send information to every thread that's running in my program, and every thread has to process that information. I can't do it using a regular queue, because that way once one thread removes the data from the queue all the other threads won't be able to see it anymore. What's the best way of achieving this? 回答1: One way is to have a queue for each thread, and the function that broadcasts the information is responsible for inserting the message into the queue of every thread. This is

问题 I'm trying to create a simple queue with Java Thread that would allow a loop, say a for loop with 10 iterations, to iterate n (< 10) threads at a time and wait until those threads are finished before continuing to iterate. Here's a better way to illustrate my problem: for (int i = 1; i <= 10; i++) { new Thread ( do_some_work() ); if ( no_available_threads ) { wait_until_available_threads(); } } do_some_work() { // do something that takes a long time } Basically what I want to do is a copy of

问题 This sample code works (I can write something in the file): from multiprocessing import Process, Queue queue = Queue() def _printer(self, queue): queue.put("hello world!!") def _cmdDisp(self, queue): f = file("Cmd.log", "w") print >> f, queue.get() f.close() instead this other sample not: (errormsg: 'module' object is not callable) import Queue queue = Queue() def _printer(self, queue): queue.put("hello world!!") def _cmdDisp(self, queue): f = file("Cmd.log", "w") print >> f, queue.get() f

问题 So in an embedded systems unit, that i'm taking at uni next year, we will learn that dynamic data structures are a bad thing to have in an embedded system program. but the lecture notes don't go into why. Now i'm working on a moderate scale, embedded systems\ 'LURC' controller, mostly just takes advantages of the peripheral of the "Butterfly" demo board for the AVR169MEGA. produced 4 PWM signals to contol servo's and ESC. and also to provide an 9 seg LCD screen. Now I can't think of anybetter

问题 I need to use a priority queue in my Python code, and: am looking for any fast implementations for priority queues optimally, I'd like the queue to be generic (i.e. work well for any object with a specified comparison operator). Looking around for something efficient, I came upon heapq, but: I'm looking for something faster than heapq , which is implemented in native Python, so it's not fast. It looks good, but seems to be specified only for integers. I suppose it works with any objects that

问题 I am using std::queue for implementing JobQueue class. ( Basically this class process each job in FIFO manner). In one scenario, I want to clear the queue in one shot( delete all jobs from the queue). I don't see any clear method available in std::queue class. How do I efficiently implement the clear method for JobQueue class ? I have one simple solution of popping in a loop but I am looking for better ways. //Clears the job queue void JobQueue ::clearJobs() { // I want to avoid pop in a loop

问题 Im wondering if its possible to have an animated gif play, then fire off an event through jquery once the gif has reached the end of its animation. Once it does that, then it loops back to the beginning of the queue, and plays the gif then event again. If you take a look at my jfiddle, i made a little gif of a guy typing. and then when he looks up and gets an idea, i want that "thought" div to change to something else. I pretty much want that word above his head to be in synch and change

问题 I am working on an app that requires fetching data from a third-party server and that server allows max 1 request per seconds. Now, all request send as job and I am trying to implement Laravel "Rate Limiting" to release 1 job per second but unable to figure out why it should be implemented and there is no real-life example in the web. Did anyone implement it? Any hint of this? 回答1: I'm the author of mxl/laravel-queue-rate-limit Composer package. It allows you to rate limit jobs on specific