Node.js工作者/后台进程 [英] Node.js workers/background processes

问题描述

如何在node.js中创建和使用后台作业?

How can I create and use background jobs in node.js?

我遇到了两个库(node-resque和node-worker)，但是想知道是否还有更多使用的库.

I've come across two libs (node-resque and node-worker) but would like to know if there's something more used.

推荐答案

我对此做了一些研究，我会这样做.

I did some research on this and I would do it like this.

1. 安装 beanstalkd .另一个消息队列，但，该消息队列支持 DELAYED PUTS .如果您从源代码进行编译，它将变得更加困难，因为它取决于 libevent (例如memcached ).但是话又说回来，我认为您不必从源代码进行编译，因为有很多二进制包可用.例如，在Ubuntu上，您可以通过发出以下命令来安装beanstalkd:

1. Install beanstalkd. Another message queue, BUT this one supports DELAYED PUTS. If you compile from source it is going to be a little harder because it depends on libevent(like memcached). But then again, I don't think you have to compile it from source, because there are a lot of binary packages available. For example on Ubuntu you can install beanstalkd by issuing the command:

sudo apt-get install beanstalkd

node-beanstalk-client

1. 安装beantalkd客户端库.我发现的最好的是 node-beanstalk-client .因为在beantalkd客户端库列表中没有/没有提到该库(然后再次将条目添加到列表中，所以我将添加该条目).与其他库相比，我更喜欢此库的原因是:

1. Install a beanstalkd client library. The best one I found was node-beanstalk-client. Because on the beanstalkd client library list this library isn't/wasn't mentioned(Then again I can add entries to the list, so I will add this one). The reasons I prefer this library over the others are:

1. Npm软件包:我喜欢使用npm软件包来安装客户端库.其他都没有.
2. 主动开发:我更喜欢具有更高/更高提交次数的库.

1. Npm package: I liked to use a npm package to install client library. The others did not have any.
2. Active development: I prefer libraries which have later/more commits.

因此，在安装 npm (

So to install it, after you have installed npm(the write way) you would just issue the following command:

npm install beanstalk_client

代码

consumer.js

var client = require('beanstalk_client').Client;

client.connect('127.0.0.1:11300', function(err, conn) {
    var reserve = function() {
        conn.reserve(function(err, job_id, job_json) {
            console.log('got job: ' + job_id);
            console.log('got job data: ' + job_json);
            console.log('module name is ' + JSON.parse(job_json).data.name);
            conn.destroy(job_id, function(err) {
                console.log('destroyed job');
                reserve();
            });
        });
    }

    reserve();
});

首先启动使用者:

node consumer.js 

下一次启动producer.js.执行producer.js后五秒钟(我指定的延迟)，consumer.js将处理该消息.

Next start producer.js. Five seconds(delay I specified) after you execute producer.js, consumer.js will process the message.

var client = require('beanstalk_client').Client;
client.connect('127.0.0.1:11300', function(err, conn) {
    var job_data = {"data": {"name": "node-beanstalk-client"}};
    var priority = 0;
    var delay = 5;
    var timeToRun = 1;
    conn.put(priority, delay, timeToRun, JSON.stringify(job_data), function(err, job_id) {
        console.log('put job: ' + job_id);
        process.exit();
    });
});

开始发布:

node producer.js

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