log4cplus_spi_Filter(3)
| log4cplus::spi::Filter(3) | log4cplus | log4cplus::spi::Filter(3) |
NAME
log4cplus::spi::Filter - Users should extend this class to implement customized logging event filtering.
SYNOPSIS
#include <filter.h>
Inherits log4cplus::helpers::SharedObject.
Inherited by log4cplus::spi::DenyAllFilter, log4cplus::spi::FunctionFilter, log4cplus::spi::LogLevelMatchFilter, log4cplus::spi::LogLevelRangeFilter, log4cplus::spi::MDCMatchFilter, log4cplus::spi::NDCMatchFilter, and log4cplus::spi::StringMatchFilter.
Public Member Functions
Filter ()
virtual ~Filter ()
void appendFilter (FilterPtr filter)
Appends filter to the end of this filter chain. virtual
FilterResult decide (const InternalLoggingEvent
&event) const =0
If the decision is DENY, then the event will be dropped.
Public Attributes
FilterPtr next
Points to the next filter in the filter chain.
Additional Inherited Members
Detailed Description
Users should extend this class to implement customized logging event filtering.
Note that the Logger and {} classes have built-in filtering rules. It is suggested that you first use and understand the built-in rules before rushing to write your own custom filters. This abstract class assumes and also imposes that filters be organized in a linear chain. The #decide decide(LoggingEvent)} method of each filter is called sequentially, in the order of their addition to the chain. If the value #DENY} is returned, then the log event is dropped immediately without consulting with the remaining filters. If the value #NEUTRAL} is returned, then the next filter in the chain is consulted. If there are no more filters in the chain, then the log event is logged. Thus, in the presence of no filters, the default behaviour is to log all logging events. If the value #ACCEPT} is returned, then the log event is logged without consulting the remaining filters. The philosophy of log4cplus filters is largely inspired from the Linux ipchains.
Definition at line 107 of file filter.h.
Constructor & Destructor Documentation
log4cplus::spi::Filter::Filter ()
virtual log4cplus::spi::Filter::~Filter () [virtual]
Member Function Documentation
void log4cplus::spi::Filter::appendFilter (FilterPtr filter)
Appends filter to the end of this filter chain.
virtual FilterResult log4cplus::spi::Filter::decide (const InternalLoggingEvent & event) const [pure virtual]
If the decision is DENY, then the event will be dropped. If the decision is NEUTRAL, then the next filter, if any, will be invoked. If the decision is ACCEPT then the event will be logged without consulting with other filters in the chain.
Parameters
Returns
Implemented in log4cplus::spi::MDCMatchFilter, log4cplus::spi::NDCMatchFilter, log4cplus::spi::StringMatchFilter, log4cplus::spi::LogLevelRangeFilter, log4cplus::spi::LogLevelMatchFilter, log4cplus::spi::DenyAllFilter, and log4cplus::spi::FunctionFilter.
Member Data Documentation
FilterPtr log4cplus::spi::Filter::next
Points to the next filter in the filter chain.
Definition at line 137 of file filter.h.
Author
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| Fri Jun 18 2021 | Version 2.0.6 |