Get the App
SLTechnology News&Howtos  ›  Database  › 

How to operate CQS in node.js

Shulou Source: shulou.com Published: 2022-05-31 21:07:32 09月12日 Update

本篇文章为大家展示了node.js中怎么对CQS进行操作,内容简明扼要并且容易理解,绝对能使你眼前一亮,通过这篇文章的详细介绍希望你能有所收获。

怎样使用node.js来操作CQS

安装:

$npminstallcqs

初始化你的CQS模块:

//Anormalimport.

varcqs=require('cqs');

//Pre-applymycouchanddbname.

cqs=cqs.defaults({"couch":"https://user:password@example.iriscouch.com"

,"db":"cqs_queue"

});

列出所有的队列:

cqs.ListQueues(function(error,queues){

console.log("Found"+queues.length+"queues:");

queues.forEach(function(queue){

console.log("*"+queue.name);

})

//Output:

//Found2queues:

//*a_queue

//*another_queue

})

创建一个队列:

//Justcreatewithaname.

cqs.CreateQueue("important_stuff",function(error,queue){

if(!error)

console.log("Importantstuffqueueisready");

})

//Createwithanoptionsobject.

varopts={QueueName:"unimportant_stuff"

,DefaultVisibilityTimeout:3600//1hour

};

cqs.CreateQueue(opts,function(error,queue){

if(!error)

console.log("Created"+queue.name+"withtimeout+"queue.VisibilityTimeout);

//Output

//Createdunimportant_stuffwithtimeout3600

})

怎样使用node.js来操作CQS

添加一个队列消息:

//TheconvenientobjectAPI:

important_stuff.send(["keepthese","things","inorder"],function(error,message){

if(!error)

console.log('Sent:'+JSON.stringify(message.Body));

//Output:

//Sent:["keepthese","things","inorder"]

})

cqs.SendMessage(important_stuff,"Thismessageisimportant!",function(error,message){

if(!error)

console.log('Sentmessage:'+message.Body);

//Output:

//Sentmessage:Thismessageisimportant!

})

//Or,justusethequeuename.

cqs.SendMessage('some_other_queue',{going_to:"theotherqueue"},function(error,message){

if(!error)

console.log('Message'+message.MessageId+'isgoingto'+message.Body.going_to);

//Output:

//Messagea9b1c48bd6ae433eb7879013332cd3cdisgoingtotheotherqueue

})

接收并处理一条队列消息:

//TheconvenientobjectAPI:

my_queue.receive(function(error,messages){

if(!error)

console.log('Receivedmessage:'+JSON.stringify(messages[0].Body));

//Output:

//Receivedmessage:

})

//ThestandardAPI,receivingmultiplemessages

cqs.ReceiveMessage(some_queue,5,function(er,messages){

if(!error)

console.log('Received'+messages.length+'messages');

//Output:

//Receivedmessages

})

删除一条队列消息:

//TheconvenientobjectAPI:

message.del(function(error){

//Messagedeletionneverresultsinanerror.Ifamessageissuccessfully

//deleted,itwillsimplyneverappearinthequeueagain.

console.log('Messagedeleted!');

})

//ThestandardAPI:

cqs.DeleteMessage(my_message,function(error){

console.log('Messagedeleted');

})

上述内容就是node.js中怎么对CQS进行操作,你们学到知识或技能了吗?如果还想学到更多技能或者丰富自己的知识储备,欢迎关注行业资讯频道。

Tags: Queues messages content skills knowledge conciseness brevity that is articles more modules articles industry information information channels channels one light storage processing Apple Docker Huawei Linux macOS MariaDB Microsoft MySQL NVidia OPPO Reno Docker vpn MariaDB Shulou Technology Apple