/*
* 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.qpid.server.logging;
import java.util.Iterator;
import org.apache.log4j.Appender;
import org.apache.log4j.Layout;
import org.apache.log4j.Logger;
import org.apache.log4j.spi.ErrorHandler;
import org.apache.log4j.spi.Filter;
import org.apache.log4j.spi.LoggingEvent;
import org.apache.log4j.spi.ThrowableInformation;
public class LogRecorder implements Appender, Iterable<LogRecorder.Record>
{
private ErrorHandler _errorHandler;
private Filter _filter;
private String _name;
private long _recordId;
private final int _bufferSize = 4096;
private final int _mask = _bufferSize - 1;
private Record[] _records = new Record[_bufferSize];
public static class Record
{
private final long _id;
private final String _logger;
private final long _timestamp;
private final String _threadName;
private final String _level;
private final String _message;
public Record(long id, LoggingEvent event)
{
_id = id;
_logger = event.getLoggerName();
_timestamp = event.timeStamp;
_threadName = event.getThreadName();
_level = event.getLevel().toString();
StringBuilder message = new StringBuilder();
String renderedMessage = event.getRenderedMessage();
if (renderedMessage != null)
{
message.append(renderedMessage);
}
ThrowableInformation ti = event.getThrowableInformation();
if (ti != null)
{
Throwable t = ti.getThrowable();
if (t != null)
{
if (message.length() > 0)
{
message.append(":");
}
String exceptionMessage = t.getMessage();
if (exceptionMessage != null && !"".equals(exceptionMessage))
{
message.append(t.getMessage());
}
else
{
message.append(t.getClass().getName());
}
}
}
_message = message.toString();
}
public long getId()
{
return _id;
}
public long getTimestamp()
{
return _timestamp;
}
public String getThreadName()
{
return _threadName;
}
public String getLevel()
{
return _level;
}
public String getMessage()
{
return _message;
}
public String getLogger()
{
return _logger;
}
}
public LogRecorder()
{
Logger.getRootLogger().addAppender(this);
}
@Override
public void addFilter(Filter filter)
{
_filter = filter;
}
@Override
public void clearFilters()
{
_filter = null;
}
@Override
public void close()
{
}
public void closeLogRecorder()
{
Logger.getRootLogger().removeAppender(this);
}
@Override
public synchronized void doAppend(LoggingEvent loggingEvent)
{
_records[((int) (_recordId & _mask))] = new Record(_recordId, loggingEvent);
_recordId++;
}
@Override
public ErrorHandler getErrorHandler()
{
return _errorHandler;
}
@Override
public Filter getFilter()
{
return _filter;
}
@Override
public Layout getLayout()
{
return null;
}
@Override
public String getName()
{
return _name;
}
@Override
public boolean requiresLayout()
{
return false;
}
@Override
public void setErrorHandler(ErrorHandler errorHandler)
{
_errorHandler = errorHandler;
}
@Override
public void setLayout(Layout layout)
{
}
@Override
public void setName(String name)
{
_name = name;
}
@Override
public Iterator<Record> iterator()
{
return new RecordIterator(Math.max(_recordId-_bufferSize, 0l));
}
private class RecordIterator implements Iterator<Record>
{
private long _id;
public RecordIterator(long currentRecordId)
{
_id = currentRecordId;
}
@Override
public boolean hasNext()
{
return _id < _recordId;
}
@Override
public Record next()
{
Record record = _records[((int) (_id & _mask))];
while(_id < _recordId-_bufferSize)
{
_id = _recordId-_bufferSize;
record = _records[((int) (_id & _mask))];
}
_id++;
return record;
}
@Override
public void remove()
{
throw new UnsupportedOperationException();
}
}
}