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NAME
    AnyEvent::Monitor - Service Monitoring using AnyEvent

SYNOPSIS
      use AnyEvent::Monitor;

      my $foo = AnyEvent::Monitor->new(
          name => 'foo',
          on_softfail => sub {
              warn "==> service fail: $_[1]";
          },
          on_hardfail => sub {
              my ($resume_check);
              warn "==> service fail, should attempt to do something to fix it: $_[1]";
              $resume_check->(60); # resume checking after 60 secs
          },
          on_resume => sub {
              my ($prev, $outage) = @_;
              if ($prev) {
                  warn "service resumed from: $prev, total outage: $outage secs";
              }
          });

      $foo->install_timers( 300 ); # delay checking for 300 secs

      sub my_polling_check {
          my ($timestamp, $status) = @_;
          # $foo->heartbeat($timestamp, $status);
      }

      $foo->status; # expecting "normal"

DESCRIPTION
    AnyEvent::Monitor provides a simple way to do periodical checks on given
    services, and provides callback when the service fails that you can
    attempt to fix it programmatically.

ATTRIBUTES
    softfail_timeout
    hardfail_timeout
    on_softfail
        The callback to be called after service remains failed for
        $soft_timeout.

    on_hardfail($resume)
        The callback to be called after service remains failed for
        $hard_timeout. You should attempt to fix the service and call
        "$resume-"($delay)> after the attempt has been made. This will make
        the monitoring resume after $delay seconds.

    on_resume($previous_status, $outage)
        The callback to be called after service monitoring resumes. If it
        had failed, $previous_status and $outage seconds will be given.

METHODS
    install_timers($delay)
        Set the next checking timer according to "soft_timeout" and
        "hard_timeout", with additional $delay from now. You don't normally
        need to call this method manually, unless you want to delay the
        start of the monitoring.

    heartbeat($timestamp, $status)
        This is used to update the status of the service. only "normal" is
        meaningful to AnyEvent::Monitor. Other values are considered as the
        service failed.

AUTHOR
    Chia-liang Kao <clkao@clkao.org>

LICENSE
    This library is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself.

SEE ALSO