Provides periodic tick notifications and module-defined cron job scheduling.<\/p>\n
This module both sends periodic tick<\/em> notifications (which can be observed by modules) and reads each module’s\n For periodic tasks the system has various periodic tick events. They are named after their interval s<\/em> for seconds, m<\/em>\nfor minutes, and h<\/em> for hours.<\/p>\n Check something every hour.<\/p>\n The return value is ignored.<\/p>\n The tick<\/em> observers are called one by one in a separate process. So a slow handler can delay the other handlers.<\/p>\n Modules can define periodic jobs using the module attribute Each entry is one of:<\/p>\n Where:<\/p>\n Important: -mod_cron_jobs<\/code> attribute to register scheduled jobs at specific intervals.<\/p>\ntick<\/h2>\n
Example<\/h3>\n
-include_lib("kernel\/include\/logger.hrl").\n\nobserve_tick_1h(tick_1h, Context) ->\n ?LOG_INFO("And another hour has passed..."),\n do_something(Context).\n<\/code><\/pre>\n-mod_cron_jobs<\/code> Module Attribute<\/h2>\n-mod_cron_jobs<\/code>.<\/p>\nmod_cron<\/code> reads this attribute from active modules and registers each job with erlcron<\/code>.<\/p>\n{RunWhen, {Module, Function, Args}}<\/code><\/li>{RunWhen, {Module, Function, Args}, JobOpts}<\/code><\/li><\/ul>\nRunWhen<\/code> is an erlcron<\/code> schedule tuple (daily\/weekly\/every\/etc.).<\/li>{Module, Function, Args}<\/code> is the MFA to call.<\/li>JobOpts<\/code> are optional erlcron<\/code> job options.<\/li><\/ul>\nmod_cron<\/code> appends the site Context<\/code> as the last argument when calling the MFA, so the target function must\naccept one extra argument.<\/p>\nExample<\/h3>\n
-mod_depends([cron]).\n-mod_cron_jobs([\n {{weekly, mon, {10, 0, 0}}, {?MODULE, send_weekly_reminders, []}}\n]).\n\nsend_weekly_reminders(Context) ->\n Events = get_this_weeks_events(Context),\n send_email_reminders(Events, Context).\n<\/code><\/pre>\n