public class RowDataTransformer extends AbstractOtterTransformer<EventData, EventData> {
private DbDialectFactory dbDialectFactory;
public EventData transform(EventData data, OtterTransformerContext context) {
EventData result = new EventData();
// 处理Table转化
DataMedia dataMedia = context.getDataMediaPair().getTarget();
result.setPairId(context.getDataMediaPair().getId());
result.setTableId(dataMedia.getId());
// 需要特殊处理下multi场景
buildName(data, result, context.getDataMediaPair());
result.setEventType(data.getEventType());
result.setExecuteTime(data.getExecuteTime());
result.setSyncConsistency(data.getSyncConsistency());
result.setRemedy(data.isRemedy());
result.setSyncMode(data.getSyncMode());
result.setSize(data.getSize());
if (data.getEventType().isDdl()) {
// ddl不需要处理字段
if (StringUtils.equalsIgnoreCase(result.getSchemaName(), data.getSchemaName())
&& StringUtils.equalsIgnoreCase(result.getTableName(), data.getTableName())) {
// 是否需要对ddl sql进行转化，暂时不支持异构，必须保证源表和目标表的名字相同
result.setDdlSchemaName(data.getDdlSchemaName());
result.setSql(data.getSql());
return result;
} else {
throw new TransformException("no support ddl for [" + data.getSchemaName() + "." + data.getTableName()
+ "] to [" + result.getSchemaName() + "." + result.getTableName()
+ "] , sql :" + data.getSql());
}
}
Multimap<String, String> translateColumnNames = HashMultimap.create();
if (context.getDataMediaPair().getColumnPairMode().isInclude()) { // 只针对正向匹配进行名字映射，exclude不做处理
List<ColumnPair> columnPairs = context.getDataMediaPair().getColumnPairs();
for (ColumnPair columnPair : columnPairs) {
translateColumnNames.put(columnPair.getSourceColumn().getName(), columnPair.getTargetColumn().getName());
}
}
// 准备一下table meta
DataMediaPair dataMediaPair = context.getDataMediaPair();
boolean useTableTransform = context.getPipeline().getParameters().getUseTableTransform();
boolean enableCompatibleMissColumn = context.getPipeline().getParameters().getEnableCompatibleMissColumn();
TableInfoHolder tableHolder = null;
if (useTableTransform || enableCompatibleMissColumn) {// 控制一下是否需要反查table meta信息，如果同构数据库，完全没必要反查
// 获取目标库的表信息
DbDialect dbDialect = dbDialectFactory.getDbDialect(dataMediaPair.getPipelineId(),
(DbMediaSource) dataMedia.getSource());
Table table = dbDialect.findTable(result.getSchemaName(), result.getTableName());
tableHolder = new TableInfoHolder(table, useTableTransform, enableCompatibleMissColumn);
}
// 处理column转化
List<EventColumn> otherColumns = translateColumns(result, data.getColumns(), context.getDataMediaPair(),
translateColumnNames, tableHolder);
translatePkColumn(result, data.getKeys(), data.getOldKeys(), otherColumns, context.getDataMediaPair(),
translateColumnNames, tableHolder);
result.setColumns(otherColumns);
return result;
}