#include <filter.h>
Inheritance diagram for log4cplus::spi::Filter:
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 |
Public Attributes | |
FilterPtr | next |
Points to the next filter in the filter chain. |
Note that the Logger and Appender 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(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 84 of file filter.h.
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Appends
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If the decision is
Implemented in log4cplus::spi::DenyAllFilter, log4cplus::spi::LogLevelMatchFilter, log4cplus::spi::LogLevelRangeFilter, and log4cplus::spi::StringMatchFilter. |
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Points to the next filter in the filter chain.
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