node.js中的Cronjobs [英] Cronjobs in node.js

问题描述

是否有可能在node.js中的某一特定时间定期调用函数？我的第一个实现是

Is there a possibility to periodically call functions at a specific time of the day in node.js? My first implementation was

setInterval(functionName(),(24*60*60*1000));

这是次优的，因为它会在每次重新启动节点时重新启动。

This is suboptimal, because it will restart every time I restart node. Are there better possibilities to implement this?

推荐答案

为了防止重新启动，您需要创建一个持久性数据存储作业。

To guard against restarts you need to create a persistent data stored job.

类似：

Job = {
    _id: Number,
    job: String,
    dueDate: Date,
    completed: Boolean
}

然后有一些代码如下：

var createJob = function(url, date) {
    var j = db.create(Job, function(j) {
         j.job = url;
         j.dueDate = date;
         j.save();
    });
};

var runJob = function(j) {
    var id = j._id;
    setInterval(j.dueDate - Date.now(), function() {
         db.getOne(Job, { _id : id }, function(j) {
             require(j.job);
             j.finished = true;
             j.save();  
         });
    });
    j = null;
};

启动时，您只需执行以下操作：

On start up you just have to do something like :

db.get(Job, { finished: false }, function(jobs) {
    jobs.forEach(runJob);
});

用MongoDB，CouchDB替换通用 db ，Redis等。

Replace the generic db with MongoDB, CouchDB, Redis, etc.

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