You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
86 lines
2.0 KiB
86 lines
2.0 KiB
6 years ago
|
var events = require('events'),
|
||
|
|
util = require('util'),
|
||
|
|
winston = require('winston');
|
||
|
|
|
||
|
|
var JOB_LIMIT = 1;
|
||
|
|
var JOB_TIMEOUT = 30 * 1000;
|
||
|
|
|
||
|
|
var JOB_QUEUE = [];
|
||
|
|
var JOBS_RUNNING = 0;
|
||
|
|
|
||
|
|
function schedule(job, cb) {
|
||
|
|
if (job && job.jobRunning)
|
||
|
|
winston.warn("Job "+job.describe_job()+" already running!");
|
||
|
|
else if (job && JOB_QUEUE.indexOf(job) >= 0)
|
||
|
|
winston.warn("Job "+job.describe_job()+" already scheduled!");
|
||
|
|
else if (job) {
|
||
|
|
JOB_QUEUE.push(job);
|
||
|
|
if (cb) {
|
||
|
|
/* Sucks */
|
||
|
|
job.once('finish', cb);
|
||
|
|
job.once('timeout', cb.bind(null, "Timed out."));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
while (JOB_QUEUE.length && JOBS_RUNNING < JOB_LIMIT)
|
||
|
|
JOB_QUEUE.shift().start_job();
|
||
|
|
}
|
||
|
|
exports.schedule = schedule;
|
||
|
|
|
||
|
|
function Job() {
|
||
|
|
events.EventEmitter.call(this);
|
||
|
|
}
|
||
|
|
util.inherits(Job, events.EventEmitter);
|
||
|
|
exports.Job = Job;
|
||
|
|
|
||
|
|
Job.prototype.start_job = function () {
|
||
|
|
if (this.jobRunning) {
|
||
|
|
winston.warn(this.describe_job() + " already started!");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
JOBS_RUNNING++;
|
||
|
|
this.jobRunning = true;
|
||
|
|
this.jobTimeout = setTimeout(this.timeout_job.bind(this), JOB_TIMEOUT);
|
||
|
|
setTimeout(this.perform_job.bind(this), 0);
|
||
|
|
};
|
||
|
|
|
||
|
|
Job.prototype.finish_job = function (p1, p2) {
|
||
|
|
if (!this.jobRunning) {
|
||
|
|
winston.warn("Attempted to finish stopped job: "
|
||
|
|
+ this.describe_job());
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
clearTimeout(this.jobTimeout);
|
||
|
|
this.jobTimeout = 0;
|
||
|
|
this.jobRunning = false;
|
||
|
|
JOBS_RUNNING--;
|
||
|
|
if (JOBS_RUNNING < 0)
|
||
|
|
winston.warn("Negative job count: " + JOBS_RUNNING);
|
||
|
|
/* use `arguments` later */
|
||
|
|
this.emit('finish', p1, p2);
|
||
|
|
schedule(null);
|
||
|
|
};
|
||
|
|
|
||
|
|
Job.prototype.timeout_job = function () {
|
||
|
|
var desc = this.describe_job();
|
||
|
|
if (!this.jobRunning) {
|
||
|
|
winston.warn("Job " + desc + " timed out though finished?!");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
winston.error(desc + " timed out.");
|
||
|
|
|
||
|
|
this.jobTimeout = 0;
|
||
|
|
this.jobRunning = false;
|
||
|
|
JOBS_RUNNING--;
|
||
|
|
if (JOBS_RUNNING < 0)
|
||
|
|
winston.warn("Negative job count: " + JOBS_RUNNING);
|
||
|
|
|
||
|
|
this.emit('timeout');
|
||
|
|
schedule(null);
|
||
|
|
};
|
||
|
|
|
||
|
|
Job.prototype.describe_job = function () {
|
||
|
|
return "<anonymous job>";
|
||
|
|
};
|