/*
* 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.
<p>It is a programming error to append to a closed appender.
@since 0.8.4
*/
public
void close();
/**
Log in <code>Appender</code> specific way. When appropriate,
Loggers will call the <code>doAppend</code> 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 <code>true</code>,
meaning that layout is required, then the configurator will
configure an layout using the configuration information at its
disposal. If this method returns <code>false</code>, 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..
<p>In the rather exceptional case, where the appender
implementation admits a layout but can also work without it, then
the appender should return <code>true</code>.
@since 0.8.4 */
public
boolean requiresLayout();
}
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