package Book::StartupLog;

use strict;
use warnings;

use Apache::Log ( );
use Apache::ServerUtil ( );

use File::Spec::Functions;

use Apache::Const -compile => 'OK';

my $log_file = catfile "logs", "startup_log";
my $log_fh;

sub open_logs {
    my($conf_pool, $log_pool, $temp_pool, $s) = @_;
    my $log_path = Apache::server_root_relative($conf_pool, $log_file);

    $s->warn("opening the log file: $log_path");
    open $log_fh, ">>$log_path" or die "can't open $log_path: $!";
    my $oldfh = select($log_fh); $| = 1; select($oldfh);

    say("process $$ is born to reproduce");
    return Apache::OK;
}

sub post_config {
    my($conf_pool, $log_pool, $temp_pool, $s) = @_;
    say("configuration is completed");
    return Apache::OK;
}

sub child_exit {
    my($child_pool, $s) = @_;
    say("process $$ now exits");
    return Apache::OK;
}

sub child_init {
    my($child_pool, $s) = @_;
    say("process $$ is born to serve");
    return Apache::OK;
}

sub say {
    my($caller) = (caller(1))[3] =~ /([^:]+)$/;
    if (defined $log_fh) {
        printf $log_fh "[%s] - %-11s: %s\n", 
            scalar(localtime), $caller, $_[0];
    }
    else {
        # when the log file is not open
        warn __PACKAGE__ . " says: $_[0]\n";
    }
}

END {
    say("process $$ is shutdown\n");
}

1;