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  package org.apache.cayenne.tx;
  
  import java.sql.Connection;
  
  /**
   * A callback that is notified as transaction progresses through stages. It can customize transaction isolation level,
   * etc.
   *
   * @since 4.0
   */
  public interface TransactionListener {
  
      void willCommit(Transaction tx);
  
      void willRollback(Transaction tx);
  
      void willAddConnection(Transaction tx, String connectionName, Connection connection);
  
      /**
       * This method could be used to decorate or substitute
       * new connection initiated inside a Cayenne transaction.
       * <br/>
       * The default implementation returns the same connection.
       *
       * @param tx transaction that initiated connection
       * @param connection connection (it could be decorated by other listeners)
       * @return connection
       *
       * @since 4.2
       */
      default Connection decorateConnection(Transaction tx, Connection connection){
          return connection;
      }
  }
  