/*
 * Copyright (c)  2017, 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */
package jdk.incubator.sql2;

/**
 * A mutable object that controls whether a transactionCompletion Operation sends
 * a database commit or a database rollback to the server. A transactionCompletion
 * Operation is created with a TransactionCompletion. By default a transactionCompletion
 * Operation requests that the database end the transaction with a commit.
 * If {@link TransactionCompletion#setRollbackOnly} is called on the TransactionCompletion used to create
 the Operation prior to the Operation being executed, the Operation will
 request that the database end the transaction with a rollback.
 
 Example:

 <pre>
 * {@code
   TransactionCompletion t = session.transactionCompletion();
   session.countOperation(updateSql)
       .resultProcessor( count -> { if (count > 1) t.setRollbackOnly(); } )
       .submit();
   session.commitMaybeRollback(t);
 }</pre>

 A TransactionCompletion can not be used to create more than one endTransaction 
 Operation.
 
 A TransactionCompletion is thread safe.
 
 ISSUE: The name is terrible. Please suggest a better alternative, TransactionLatch?
 */
public interface TransactionCompletion {

  /**
   * Causes an endTransactionOperation created with this TransactionCompletion that is executed
   * subsequent to this call to perform a rollback. If this method is not called
   * prior to Operation execution the Operation will perform a commit.
   *
   * @return true if the call succeeded. False if the call did not succeed in
 setting the TransactionCompletion rollback only because the endTransaction
 Operation had already been executed.
   */
  public boolean setRollbackOnly();

  /**
   * Returns {@code true} iff the {@link setRollbackOnly} method has been called
 on this TransactionCompletion
   *
   * @return {@code true} if {@link setRollbackOnly} has been called.
   */
  public boolean isRollbackOnly();

}