Crontab for Erlang, a simple scheduling application.
This is suitable for long-running applications that needs to run periodic jobs. It's similar to the cron utility but in Erlang.
Start with compiling and opening a shell rebar3 compile && rebar3 shell:
ok = application:start(crontab).
MFA = {io, format, ["hello from crontab\n"]}.
MFA2 = {lists, map, [bad_args]}.
%% every minute
ok = crontab:add(job1, ['*', '*', '*', '*', '*'], MFA1).
ok = crontab:remove(job1).
%% once/week, monday 8.30
ok = crontab:add(job2, ['*', '*', monday, 8, 30], MFA1).
%% first day of month, 00.00
ok = crontab:add(job3, ['*', '*', 1, 0, 0], MFA1).
%% 29th of february, 20.00
ok = crontab:add(job4, ['*', 2, 29, 20, 0], MFA1).
%% every 15 minute on mondays and fridays
ok = crontab:add(job5, ['*', '*', [monday, friday], '*', [0, 15, 30, 45]], MFA1).
%% failing job every minute
ok = crontab:add(job6, ['*', '*', '*', '*', '*'], MFA2).Each execution of a job will have it's own process and success/failure is logged.
API consists of crontab:add/3, crontab:remove/1 and crontab:remove/2.
crontab:add(Name::atom(), Spec::list(), MFA::mfa()) -> ok | {error, task_exists} | {error, no_next_found}.
crontab:remove(Name::atom()) -> ok | {error, no_such_task}.
crontab:remove(atom(), list()) -> ok | {error, no_such_task}.Spec = [year(), month(), day(), hour(), min()]
year() :: 0..N | '*' | [2013, 2015, ..]
month() :: 1..12 | '*' | [1, 2, 3, ..]
day() :: 1..31 | monday | tuesday | wednesday | thursday | friday |
saturday | sunday | [monday, 21, friday, ..]
hour() :: 0..23 | '*' | [12, 22, ..]
min() :: 0..59 | '*' | [0, 15, 30, 45, ..]- Make testcases run faster
- Ensure all parts are tested