Apache Log4cxx  Version 1.3.0
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custom-appender.cpp

This example shows how to extend Log4cxx with a new appender.

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using namespace LOG4CXX_NS;
namespace com::foo {
class NullWriterAppender : public AppenderSkeleton {
public:
DECLARE_LOG4CXX_OBJECT(NullWriterAppender)
LOG4CXX_CAST_ENTRY(NullWriterAppender)
LOG4CXX_CAST_ENTRY_CHAIN(AppenderSkeleton)
NullWriterAppender(){}
void close() override{}
bool requiresLayout() const override {
return false;
}
void append(const spi::LoggingEventPtr& event, helpers::Pool& p) override {
// This gets called whenever there is a valid event for our appender.
}
void activateOptions(helpers::Pool& /* pool */) override {
// Given all of our options, do something useful(e.g. open a file)
}
void setOption(const LogString& option, const LogString& value) override {
if (helpers::StringHelper::equalsIgnoreCase
( option
, LOG4CXX_STR("SOMEVALUE")
, LOG4CXX_STR("somevalue")
))
{
// Do something with the 'value' here.
}
}
};
IMPLEMENT_LOG4CXX_OBJECT(NullWriterAppender)
}
int main( int argc, char** argv )
{
xml::DOMConfigurator::configure( "custom-appender.xml" );
LoggerPtr rootLogger = Logger::getRootLogger();
LoggerPtr nullLogger = Logger::getLogger( "NullLogger" );
LOG4CXX_INFO( rootLogger, "This is some root message" );
LOG4CXX_INFO( nullLogger, "This message will be discarded" );
}
#define LOG4CXX_INFO(logger, message)
Add a new logging event containing message to attached appender(s) if logger is enabled for INFO even...
Definition: log4cxx/logger.h:2307
#define LOG4CXX_NS
Definition: log4cxx.h:104
#define LOG4CXX_CAST_ENTRY(Interface)
Definition: object.h:158
#define IMPLEMENT_LOG4CXX_OBJECT(object)
Definition: object.h:66
#define END_LOG4CXX_CAST_MAP()
Definition: object.h:152
#define DECLARE_LOG4CXX_OBJECT(object)
Definition: object.h:43
#define LOG4CXX_CAST_ENTRY_CHAIN(Interface)
Definition: object.h:164
#define BEGIN_LOG4CXX_CAST_MAP()
Definition: object.h:146