如何在运行时更改log4perl appender的过滤器？

Question

我一直试图弄清楚我是否可以在运行时更改appender的过滤器,我已经通过配置文件定义了.

log4perl.filter.M1               = Log::Log4perl::Filter::LevelMatch
log4perl.filter.M2               = Log::Log4perl::Filter::LevelMatch
log4perl.filter.M1.LevelToMatch  = INFO
log4perl.filter.M1.AcceptOnMatch = true
log4perl.filter.M2.LevelToMatch  = WARN
log4perl.filter.M2.AcceptOnMatch = true
log4perl.filter.MyBoolean0       = Log::Log4perl::Filter::Boolean
log4perl.filter.MyBoolean0.logic = M1
log4perl.filter.MyBoolean1       = Log::Log4perl::Filter::Boolean
log4perl.filter.MyBoolean1.logic = M1 || M2

log4perl.appender.SCREEN.Filter  = MyBoolean0 

我想将此过滤器更改MyBoolean0为SCREENto MyBoolean1,但是在我的程序开始运行后执行此操作.

使用Data :: Dumper 查询APPENDER_BY_NAME哈希SCREEN显示以下内容:

$VAR1 = bless( {
     'appender' => bless( {
                            'Filter' => 'MyBoolean0',
                            'color' => {
...
...
     'filter' => bless( {·
                          'params' => {·
                                        'M3' => bless( {·
                                                         'LevelToMatch' => 'ERROR',
                                                         'name' => 'M3',
                                                         'AcceptOnMatch' => 1
                                                       }, 'Log::Log4perl::Filter::LevelMatch' ),
                                        'M1' => bless( {·
                                                         'LevelToMatch' => 'INFO',
                                                         'name' => 'M1',
                                                         'AcceptOnMatch' => 1
                                                       }, 'Log::Log4perl::Filter::LevelMatch' ),
                                        'M2' => bless( {·
                                                         'LevelToMatch' => 'WARN',
                                                         'name' => 'M2',
                                                         'AcceptOnMatch' => 1
                                                       }, 'Log::Log4perl::Filter::LevelMatch' )
                                      },
                          'name' => 'MyBoolean0',
                          'eval_func' => sub { "DUMMY" },
                          'logic' => 'M1 || M2 || M3'
                        }, 'Log::Log4perl::Filter::Boolean' ),
     'warp_message' => undef,
     'name' => 'SCREEN'
   }, 'Log::Log4perl::Appender' );

但是这个HASH的混乱对我来说似乎很骇人听闻.有没有更好的方法来更改appender的过滤器？

Answer 1

您可以使用未记录的appender属性filter:

$Log::Log4perl::Logger::APPENDER_BY_NAME{'SCREEN'}->filter(
    Log::Log4perl::Filter::by_name('MyBoolean1')
);

您也可以使用两个appender:

log4perl.appender.SCREEN0.Filter = MyBoolean0
log4perl.appender.SCREEN1.Filter = MyBoolean1

并在运行时更改它:

$logger->remove_appender('SCREEN0', 1);
$logger->add_appender(
    Log::Log4perl::Config::create_appender_instance(
        $Log::Log4perl::Config::OLD_CONFIG,
        'SCREEN1',
        \%Log::Log4perl::Logger::APPENDER_BY_NAME
    )
);