package io.ebeaninternal.server.transaction;

import javax.persistence.PersistenceException;
import java.sql.Connection;

/**
 * Transaction based on a java.sql.Connection supplied by an external
 * transaction manager such as Spring.
 * <p>
 * This means that the transaction demarcation [commit(), rollback(), end()]
 * must be controlled externally (by Spring etc) and so these methods [commit(),
 * rollback(), end()] can not be called on this ExternalJdbcTransaction.
 * </p>
 * <p>
 * That is, a transaction started externally (by Spring etc) must be committed
 * or rolled back externally as well.
 * </p>
 */
public class ExternalJdbcTransaction extends JdbcTransaction {

  /**
   * Create a Transaction that will have no transaction logging support.
   * <p>
   * You need to create with a TransactionManager to have transaction logging.
   * </p>
   */
  public ExternalJdbcTransaction(Connection connection) {
    super(null, true, connection, null);
  }

  /**
   * Construct will all explicit parameters.
   */
  public ExternalJdbcTransaction(String id, boolean explicit, Connection connection, TransactionManager manager) {
    super(id, explicit, connection, manager);
  }

  /**
   * This will always throw a PersistenceException.
   * <p>
   * Externally created connections should be committed or rolled back externally.
   * </p>
   */
  @Override
  public void commit() {
    throw new PersistenceException("This is an external transaction so must be committed externally");
  }

  /**
   * This will always throw a PersistenceException.
   * <p>
   * Externally created connections should be committed or rolled back externally.
   * </p>
   */
  @Override
  public void end() throws PersistenceException {
    throw new PersistenceException("This is an external transaction so must be committed externally");
  }

  /**
   * This will always throw a PersistenceException.
   * <p>
   * Externally created connections should be committed or rolled back externally.
   * </p>
   */
  @Override
  public void rollback() throws PersistenceException {
    throw new PersistenceException("This is an external transaction so must be rolled back externally");
  }

  /**
   * This will always throw a PersistenceException.
   * <p>
   * Externally created connections should be committed or rolled back externally.
   * </p>
   */
  @Override
  public void rollback(Throwable e) throws PersistenceException {
    throw new PersistenceException("This is an external transaction so must be rolled back externally");
  }

}