# --
# Copyright (C) 2001-2019 OTRS AG, https://otrs.com/
# --
# This software comes with ABSOLUTELY NO WARRANTY. For details, see
# the enclosed file COPYING for license information (GPL). If you
# did not receive this file, see https://www.gnu.org/licenses/gpl-3.0.txt.
# --

package Kernel::System::Daemon::DaemonModules::SchedulerFutureTaskManager;

use strict;
use warnings;
use utf8;

use parent qw(Kernel::System::Daemon::BaseDaemon);

our @ObjectDependencies = (
    'Kernel::Config',
    'Kernel::System::DB',
    'Kernel::System::Daemon::SchedulerDB',
    'Kernel::System::Cache',
    'Kernel::System::Log',
);

=head1 NAME

Kernel::System::Daemon::DaemonModules::SchedulerFutureTaskManager - daemon to manage scheduler future tasks

=head1 DESCRIPTION

Scheduler future task daemon

=head1 PUBLIC INTERFACE

=head2 new()

Create scheduler future task manager object.

=cut

sub new {
    my ( $Type, %Param ) = @_;

    # Allocate new hash for object.
    my $Self = {};
    bless $Self, $Type;

    # Get objects in constructor to save performance.
    $Self->{ConfigObject}      = $Kernel::OM->Get('Kernel::Config');
    $Self->{CacheObject}       = $Kernel::OM->Get('Kernel::System::Cache');
    $Self->{DBObject}          = $Kernel::OM->Get('Kernel::System::DB');
    $Self->{SchedulerDBObject} = $Kernel::OM->Get('Kernel::System::Daemon::SchedulerDB');

    # Disable in memory cache to be clusterable.
    $Self->{CacheObject}->Configure(
        CacheInMemory  => 0,
        CacheInBackend => 1,
    );

    # Get the NodeID from the SysConfig settings, this is used on High Availability systems.
    $Self->{NodeID} = $Self->{ConfigObject}->Get('NodeID') || 1;

    # Check NodeID, if does not match is impossible to continue.
    if ( $Self->{NodeID} !~ m{ \A \d+ \z }xms && $Self->{NodeID} > 0 && $Self->{NodeID} < 1000 ) {
        $Kernel::OM->Get('Kernel::System::Log')->Log(
            Priority => 'error',
            Message  => "NodeID '$Self->{NodeID}' is invalid!",
        );
        return;
    }

    # Do not change the following values!
    # Modulo in PreRun() can be damaged after a change.
    $Self->{SleepPost} = 1;          # sleep 1 second after each loop
    $Self->{Discard}   = 60 * 60;    # discard every hour

    $Self->{DiscardCount} = $Self->{Discard} / $Self->{SleepPost};

    $Self->{Debug}      = $Param{Debug};
    $Self->{DaemonName} = 'Daemon: SchedulerFutureTaskManager';

    return $Self;
}

sub PreRun {
    my ( $Self, %Param ) = @_;

    # Check the database connection each 10 seconds.
    return 1 if $Self->{DiscardCount} % ( 10 / $Self->{SleepPost} );

    # Check if database is on-line.
    return 1 if $Self->{DBObject}->Ping();

    sleep 10;

    return;
}

sub Run {
    my ( $Self, %Param ) = @_;

    return if !$Self->{SchedulerDBObject}->FutureTaskToExecute(
        NodeID => $Self->{NodeID},
        PID    => $$,
    );

    return 1;
}

sub PostRun {
    my ( $Self, %Param ) = @_;

    sleep $Self->{SleepPost};

    $Self->{DiscardCount}--;

    if ( $Self->{Debug} && $Self->{DiscardCount} == 0 ) {
        print "  $Self->{DaemonName} will be stopped and set for restart!\n";
    }

    return if $Self->{DiscardCount} <= 0;
    return 1;
}

sub Summary {
    my ( $Self, %Param ) = @_;

    return $Self->{SchedulerDBObject}->FutureTaskSummary();
}

sub DESTROY {
    my $Self = shift;

    return 1;
}

1;

=head1 TERMS AND CONDITIONS

This software is part of the OTRS project (L<https://otrs.org/>).

This software comes with ABSOLUTELY NO WARRANTY. For details, see
the enclosed file COPYING for license information (GPL). If you
did not receive this file, see L<https://www.gnu.org/licenses/gpl-3.0.txt>.

=cut