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MongoDbPatternLayoutAppender.java
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MongoDbPatternLayoutAppender.java
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/*
* Copyright (C) 2010 Robert Stewart (robert@wombatnation.com)
*
* Licensed 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 com.google.code.log4mongo;
import org.apache.log4j.spi.LoggingEvent;
import com.mongodb.DBObject;
import com.mongodb.util.JSON;
/**
* Log4J Appender that uses a PatternLayout to write log events into a MongoDB database.
*
* The conversion pattern specifies the format of a JSON document. The document can contain
* sub-documents and the elements can be strings or arrays.
*
* For some Log4J appenders (especially file appenders) it is common to use blank space padding to
* get fields in adjacent rows to line up. For example, %-5p is often used to make all log levels
* the same width in characters. Since each value is stored in a separate property in the document,
* it usually doesn't make sense to use blank space padding with MongoDbAppender.
*
* The appender does <u>not</u> create any indexes on the data that's stored. If query performance
* is required those must be created externally (e.g., in the mongodb shell or an external reporting
* application).
*
* @author Robert Stewart (robert@wombatnation.com)
* @see http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Appender.html
* @see http://www.mongodb.org/
* @version $Id$
*/
public class MongoDbPatternLayoutAppender extends MongoDbAppender
{
@Override
public boolean requiresLayout()
{
return (true);
}
/**
* Inserts a BSON representation of a LoggingEvent into a MongoDB collection.
* A PatternLayout is used to format the data in the LoggingEvent and, optionally,
* custom data returned by PatternConverters into a JSON document.
*
* The format of the JDSON document is specified in the .layout.ConversionPattern property.
*
* @param loggingEvent The LoggingEvent that will be formatted and stored in MongoDB
*/
@Override
protected void append(final LoggingEvent loggingEvent)
{
DBObject bson = null;
String json = layout.format(loggingEvent);
if (json.length() > 0)
{
Object obj = JSON.parse(json);
if (obj instanceof DBObject)
{
bson = (DBObject) obj;
}
}
if (bson != null)
{
getCollection().insert(bson);
}
}
}