message-queue

问题 Im using System V Message Queue, which does not have a "timed receive" function, like POSIX MQ. But now i need it (this timed receive func.). One can ask: "so why dont you use POSIX instead of Sys V?". Because in my benchmarks SysV MQ was +- 20% faster than POSIX MQ. Now the question. How to fake a "timed receive" for Sys V MQ? I wrote a piece of code that does it testing msgrcv with IPC_NOWAIT in a loop with usleep . I think its ugly, so i need ideas to write a beautiful one =] 回答1: You

问题 Im using System V Message Queue, which does not have a "timed receive" function, like POSIX MQ. But now i need it (this timed receive func.). One can ask: "so why dont you use POSIX instead of Sys V?". Because in my benchmarks SysV MQ was +- 20% faster than POSIX MQ. Now the question. How to fake a "timed receive" for Sys V MQ? I wrote a piece of code that does it testing msgrcv with IPC_NOWAIT in a loop with usleep . I think its ugly, so i need ideas to write a beautiful one =] 回答1: You

问题 Is there a way to receive multiple message using a single synchronous call using .NET? I've seen question and I've found java class com.rabbitmq.client.QueueingConsumer, but I haven't found such client class in .NET namespaces (RabbitMQ.Client, RabbitMQ.Client.Events) 回答1: You can retrieve as many messages as you want using the BasicQoS.PrefetchCount : var model = _rabbitConnection.CreateModel(); // Configure the Quality of service for the model. Below is how what each setting means. //

问题 Is it possible to send a messaging request to Amazon's SQS directly from javascript? I'm trying to create a logging system and would love to bypass sending the request to a middleman server. Also, does anybody know of any alternatives to this solution that I may leverage? 回答1: SQS(and as a matter of fact all aws services) expose REST based apis. You can directly make a http request to the SQS REST api through javascript code. The api documentation id given here. 回答2: Unless you load your

问题 I have an idea. Write a WebSocket based RPC that would process messages according to the scenario below. Client connects to a WS (web socket) server Client sends a message to the WS server WS server puts the message into the incoming queue (can be a multiprocessing.Queue or RabbitMQ queue) One of the workers in the process pool picks up the message for processing Message is being processed (can be blazingly fast or extremely slow - it is irrelevant for the WS server) After the message is

问题 This bug baffled me for hours. I am getting the NullPointerException . The problem is this error is not consistent. It happens when I launch the app, but only occasionally. So I am not sure what is causing it. I apologize for the verbose question with the error log, but I could not find another way of asking. The error log is as follows: FATAL EXCEPTION: main Process: com.myproject.android, PID: 22175 java.lang.NullPointerException at com.myproject.android.ImageDownloaderThread.queueImage

问题 This bug baffled me for hours. I am getting the NullPointerException . The problem is this error is not consistent. It happens when I launch the app, but only occasionally. So I am not sure what is causing it. I apologize for the verbose question with the error log, but I could not find another way of asking. The error log is as follows: FATAL EXCEPTION: main Process: com.myproject.android, PID: 22175 java.lang.NullPointerException at com.myproject.android.ImageDownloaderThread.queueImage

问题 I am currently struggle to find a solution for implement a specific kind of queue, which require the following traits: All queue must respect the order that job were added. The whole queue will have a concurrency of 1, which means that there will only be one job execute at a time per queue , not worker. There will be more than a few thousand queue like this. It need to be distributed and be able to scale (example if I add a worker) Basically it is a single process FIFO queue, and this is

问题 I wonder what is the difference between them. Are they describing the same thing? Is Google App Engine Service Task Queue is an implementation of Message Queue? 回答1: I asked a similar question on some Developer Community Groups on Facebook. It was not about GoogleAppEngine specifically - i asked in more of a general sense to determine use case between RabbitMQ and Celery. Here are the responses I got which I think is relevant to the topic and fairly clarifies the difference between a message

问题 What are all the differences between pipes and message queues? Please explain both from vxworks & unix perspectives. I think pipes are unidirectional but message queues aren't. But don't pipes internally use message queues, then how come pipes are unidirectional but message queues are not? What are the other differences you can think of (from design or usage or other perspectives)? 回答1: Message Queues are: UNIDIRECTIONAL Fixed number of entries Each entry has a maximum size All the queue