org.apache.log4j.Appender Maven / Gradle / Ivy
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/*
* 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.
*/
package org.apache.log4j;
import org.apache.log4j.spi.Filter;
import org.apache.log4j.spi.ErrorHandler;
import org.apache.log4j.spi.LoggingEvent;
/**
Implement this interface for your own strategies for outputting log
statements.
@author Ceki Gülcü
*/
public interface Appender {
/**
Add a filter to the end of the filter list.
@since 0.9.0
*/
void addFilter(Filter newFilter);
/**
Returns the head Filter. The Filters are organized in a linked list
and so all Filters on this Appender are available through the result.
@return the head Filter or null, if no Filters are present
@since 1.1
*/
public
Filter getFilter();
/**
Clear the list of filters by removing all the filters in it.
@since 0.9.0
*/
public
void clearFilters();
/**
Release any resources allocated within the appender such as file
handles, network connections, etc.
It is a programming error to append to a closed appender.
@since 0.8.4
*/
public
void close();
/**
Log in Appender specific way. When appropriate,
Loggers will call the doAppend method of appender
implementations in order to log. */
public
void doAppend(LoggingEvent event);
/**
Get the name of this appender.
@return name, may be null.*/
public
String getName();
/**
Set the {@link ErrorHandler} for this appender.
@since 0.9.0
*/
public
void setErrorHandler(ErrorHandler errorHandler);
/**
Returns the {@link ErrorHandler} for this appender.
@since 1.1
*/
public
ErrorHandler getErrorHandler();
/**
Set the {@link Layout} for this appender.
@since 0.8.1
*/
public
void setLayout(Layout layout);
/**
Returns this appenders layout.
@since 1.1
*/
public
Layout getLayout();
/**
Set the name of this appender. The name is used by other
components to identify this appender.
@since 0.8.1
*/
public
void setName(String name);
/**
Configurators call this method to determine if the appender
requires a layout. If this method returns true,
meaning that layout is required, then the configurator will
configure an layout using the configuration information at its
disposal. If this method returns false, meaning that
a layout is not required, then layout configuration will be
skipped even if there is available layout configuration
information at the disposal of the configurator..
In the rather exceptional case, where the appender
implementation admits a layout but can also work without it, then
the appender should return true.
@since 0.8.4 */
public
boolean requiresLayout();
}