crond

distributed cron server store task and log into mysql

mysql schema

cron tab:

field	type
uid	varchar(255)
rule	varchar(255)
next	datetime
handler	varchar(255)

cron log:

field	type
id	int(11)
uid	varchar(255)
create_time	datetime
start_time	datetime
end_time	datetime
success	tinyint(1)(default 0)
message	varchar(255)

var crond = require('crond');
var crontab = new Crond('mysql://name:password@host:port/db', 'cron_tab', 'cron_log');
crontab.add(uid, rule); //if duplicated nothing happend
crontab.job(uid, function() {}); //multiple job only tragger once