code: public void init(final DatabaseType databaseType, final Map<String, DataSource> dataSourceMap) {
          for (Entry<TransactionType, ShardingTransactionManager> entry : transactionManagerMap.entrySet()) {
              entry.getValue().init(databaseType, getResourceDataSources(dataSourceMap));
          }
      }
docs: Initialize sharding transaction managers.
  
  @param databaseType database type
  @param dataSourceMap data source map