* @return <code>UknownLogEvent</code> if event type is unknown or skipped.
*/
public static LogEvent decode(LogBuffer buffer, LogHeader header,
LogContext context) throws IOException
{
FormatDescriptionLogEvent descriptionEvent = context.getFormatDescription();
LogPosition logPosition = context.getLogPosition();
int checksumAlg = LogEvent.BINLOG_CHECKSUM_ALG_UNDEF;
if (header.getType() != LogEvent.FORMAT_DESCRIPTION_EVENT) {
checksumAlg = descriptionEvent.header.getChecksumAlg();
}else {
// 如果是format事件自己，也需要处理checksum
checksumAlg = header.getChecksumAlg();
}
if (checksumAlg != LogEvent.BINLOG_CHECKSUM_ALG_OFF && checksumAlg != LogEvent.BINLOG_CHECKSUM_ALG_UNDEF) {
// remove checksum bytes
buffer.limit(header.getEventLen() - LogEvent.BINLOG_CHECKSUM_LEN);
}
switch (header.getType())
{
case LogEvent.QUERY_EVENT:
{
QueryLogEvent event = new QueryLogEvent(header, buffer,
descriptionEvent);
/* updating position in context */
logPosition.position = header.getLogPos();
return event;
}
case LogEvent.XID_EVENT:
{
XidLogEvent event = new XidLogEvent(header, buffer,
descriptionEvent);
/* updating position in context */
logPosition.position = header.getLogPos();
return event;
}
case LogEvent.TABLE_MAP_EVENT:
{
TableMapLogEvent mapEvent = new TableMapLogEvent(header,
buffer, descriptionEvent);
/* updating position in context */
logPosition.position = header.getLogPos();
context.putTable(mapEvent);
return mapEvent;
}
case LogEvent.WRITE_ROWS_EVENT_V1:
{
RowsLogEvent event = new WriteRowsLogEvent(header, buffer,
descriptionEvent);
/* updating position in context */
logPosition.position = header.getLogPos();
event.fillTable(context);
return event;
}
case LogEvent.UPDATE_ROWS_EVENT_V1:
{
RowsLogEvent event = new UpdateRowsLogEvent(header, buffer,
descriptionEvent);
/* updating position in context */
logPosition.position = header.getLogPos();
event.fillTable(context);
return event;
}
case LogEvent.DELETE_ROWS_EVENT_V1:
{
RowsLogEvent event = new DeleteRowsLogEvent(header, buffer,
descriptionEvent);
/* updating position in context */
logPosition.position = header.getLogPos();
event.fillTable(context);
return event;
}
case LogEvent.ROTATE_EVENT:
{
RotateLogEvent event = new RotateLogEvent(header, buffer,
descriptionEvent);
/* updating position in context */
logPosition = new LogPosition(event.getFilename(),
event.getPosition());
context.setLogPosition(logPosition);
return event;
}
case LogEvent.LOAD_EVENT:
case LogEvent.NEW_LOAD_EVENT:
{
LoadLogEvent event = new LoadLogEvent(header, buffer,
descriptionEvent);
/* updating position in context */
logPosition.position = header.getLogPos();
return event;
}
case LogEvent.SLAVE_EVENT: /* can never happen (unused event) */
{
if (logger.isWarnEnabled())
logger.warn("Skipping unsupported SLAVE_EVENT from: "
+ context.getLogPosition());
break;
}
case LogEvent.CREATE_FILE_EVENT:
{
CreateFileLogEvent event = new CreateFileLogEvent(header,
buffer, descriptionEvent);
/* updating position in context */
logPosition.position = header.getLogPos();
return event;
}
case LogEvent.APPEND_BLOCK_EVENT:
{
AppendBlockLogEvent event = new AppendBlockLogEvent(header,
buffer, descriptionEvent);
/* updating position in context */
logPosition.position = header.getLogPos();
return event;
}
case LogEvent.DELETE_FILE_EVENT:
{
DeleteFileLogEvent event = new DeleteFileLogEvent(header,
buffer, descriptionEvent);
/* updating position in context */
logPosition.position = header.getLogPos();
return event;
}
case LogEvent.EXEC_LOAD_EVENT:
{
ExecuteLoadLogEvent event = new ExecuteLoadLogEvent(header,
buffer, descriptionEvent);
/* updating position in context */
logPosition.position = header.getLogPos();
return event;
}
case LogEvent.START_EVENT_V3:
{
/* This is sent only by MySQL <=4.x */
StartLogEventV3 event = new StartLogEventV3(header, buffer,
descriptionEvent);
/* updating position in context */
logPosition.position = header.getLogPos();
return event;
}
case LogEvent.STOP_EVENT:
{
StopLogEvent event = new StopLogEvent(header, buffer,
descriptionEvent);
/* updating position in context */
logPosition.position = header.getLogPos();
return event;
}
case LogEvent.INTVAR_EVENT:
{
IntvarLogEvent event = new IntvarLogEvent(header, buffer,
descriptionEvent);
/* updating position in context */
logPosition.position = header.getLogPos();
return event;
}
case LogEvent.RAND_EVENT:
{
RandLogEvent event = new RandLogEvent(header, buffer,
descriptionEvent);
/* updating position in context */
logPosition.position = header.getLogPos();
return event;
}
case LogEvent.USER_VAR_EVENT:
{
UserVarLogEvent event = new UserVarLogEvent(header, buffer,
descriptionEvent);
/* updating position in context */
logPosition.position = header.getLogPos();
return event;
}
case LogEvent.FORMAT_DESCRIPTION_EVENT:
{
descriptionEvent = new FormatDescriptionLogEvent(header,
buffer, descriptionEvent);
context.setFormatDescription(descriptionEvent);
return descriptionEvent;
}
case LogEvent.PRE_GA_WRITE_ROWS_EVENT: