queue | 易学教程

Serialization of 'Closure' is not allowed in Laravel 5.3 Email Queue

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问题 I am willing to send email to list of email address using queue . Without using queue my code is working fine but with queue it's showing following error: Exception in Queue.php line 86: Serialization of 'Closure' is not allowed in /home/hizbul/Development/Projects/Laravel/fastskool/vendor/laravel/framework/src/Illuminate/Queue/Queue.php line 86 at serialize(object(SendMessageToStudent)) in Queue.php line 86 at Queue->createPayload(object(SendMessageToStudent), '') in DatabaseQueue.php line

Put multiple items in a python queue

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问题 Suppose you have an iterable items containing items that should be put in a queue q . Of course you can do it like this: for i in items: q.put(i) But it feels unnecessary to write this in two lines - is that supposed to be pythonic? Is there no way to do something more readable - i.e. like this q.put(*items) 回答1: Using the built-in map function : map(q.put, items) It will apply q.put to all your items in your list. Useful one-liner. For Python 3, you can use it as following : list(map(q.put,

Slow HornetQ Producer when Queue is persistent

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问题 I have tried with Persistent Queue in horntQ. I have made two separate examples (Producer, Consumer). My consumer is working well but the Producer is taking too much time to finish sending message. I have run both separately as well as together. What could be the problem? my code is: public class HornetProducer implements Runnable{ Context ic = null; ConnectionFactory cf = null; Connection connection = null; Queue queue = null; Session session = null; MessageProducer publisher = null;

Apache ActiveMQ Queue Topic 详解

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一、特性及优势 1、实现 JMS1.1 规范，支持 J2EE1.4以上 2、可运行于任何 jvm和大部分 web 容器（ActiveMQ works great in any JVM） 3、支持多种语言客户端（java, C, C++, AJAX, ACTIONSCRIPT 等等） 4、支持多种协议（stomp，openwire，REST） 5、良好的 spring 支持（ActiveMQ has great Spring Support） 6、速度很快，JBossMQ的十倍（ActiveMQ is very fast; often 10x faster than JBossMQ.） 7、与 OpenJMS、JbossMQ等开源jms provider 相比，ActiveMQ有 Apache 的支持，持续发展的优势明显。二、下载部署 1、下载 http://activemq.apache.org/activemq-510-release.html ，下载 5.1.0 Windows Distribution版本 2、安装直接解压至任意目录（如：d:\ apache-activemq-5.1.0） 3、启动 ActiveMQ服务器方法 1：直接运行 bin\activemq.bat 方法 2（在 JVM 中嵌套启动）： cd example ant embedBroker

Do Delay Queue messages count as “In Flight” in SQS?

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问题 I'm working on a project in which I intend to use an Amazon SQS Delay Queue. I'm having a bit of trouble understanding exactly what is meant by "inflight" messages. There is a note in the documentation that says: Note There is a 120,000 limit for the number of inflight messages per queue. Messages are inflight after they have been received by the queue, but have not yet been deleted from the queue. If you reach the 120,000 limit, you will receive an OverLimit error message from Amazon SQS. To

How to check whether a vector is LIFO/FIFO decreasing

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问题 Suppose I have a data.table where each row consists of two vectors: A 'pre-subtraction' vector. A 'post-subtraction' vector. The pre-subtraction is the left-half most column and the post- is the right-most columns, with the suffix "prm" at the end. For example: #Sample Data set.seed(2) fill = data.table(n=1:7) Tp=3 for(t in 1:Tp){ set(x = fill, j = paste0('v',t), value = sample(0:10,7)) } fill[1,paste0('v',3):=0] fill[5,paste0('v',2):=0] fill[5,paste0('v',3):=0] for(t in 1:Tp){ fill[,paste0(

Python utilizing multiple processors

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问题 Lets say I have a big list of music of varying length that needs to be converted or images of varying sizes that need to be resized or something like that. The order doesn't matter so it is perfect for splitting across multiple processors. If I use multiprocessing.Pool's map function it seems like all the work is divided up ahead of time and doesn't take into account the fact that some files may take longer to do that others. What happens is that if I have 12 processors... near the end of

Python multiple subprocess with a pool/queue recover output as soon as one finishes and launch next job in queue

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问题 I'm currently launching a subprocess and parsing stdout on the go without waiting for it to finish to parse stdout. for sample in all_samples: my_tool_subprocess = subprocess.Popen('mytool {}'.format(sample),shell=True, stdout=subprocess.PIPE) line = True while line: myline = my_tool_subprocess.stdout.readline() #here I parse stdout.. In my script I perform this action multiple times, indeed depending on the number of input samples. Main problem here is that every subprocess is a program/tool

When to use queue over arraylist

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问题 One basic argument to use a Queue over an ArrayList is that Queue guarantees FIFO behavior. But if I add 10 elements to an ArrayList and then iterate over the elements starting from the 0th element, then I will retrieve the elements in the same order as they were added. So essentially, that guarantees a FIFO behavior. What is so special about Queue as compared to traditional ArrayList? 回答1: If I gave you a Queue instance then you would know that by iteratively calling remove() you would

Is my RabbitMQ cluster Active Active or Active Passive?

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I have created a cluster consists of three RabbitMQ nodes using join_cluster command. i.e. rabbitmqctl –n rabbit2@MYPC1 join_cluster rabbit2@MYPC1 (currently the cluster runs on a single computer) Questions: In the documents it says there is one implemetation for active passive and one for active active. What did I configure? How do I know? How can it be changed? Is there a big performance trade off between Active Active & Active Passive? What is the best practice to interact with active/active? i.e. install a load balancer? apache that will round robin What is the best practice to interact