library/src/main/java/com/datatorrent/lib/db/jdbc/JdbcNonTransactionalStore.java

/*
 * Copyright (c) 2014 DataTorrent, Inc. ALL Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.datatorrent.lib.db.jdbc;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * A store which is used to connect to a non transactional jdbc database.
 * This class contains helper methods to keep track of which window has
 * been committed.
 *
 * @since 1.0.5
 */
public class JdbcNonTransactionalStore extends JdbcTransactionalStore
{
  @Override
  public final void beginTransaction()
  {
    throw new RuntimeException("Does not support transactions.");
  }

  @Override
  public final void commitTransaction()
  {
    throw new RuntimeException("Does not support transactions.");
  }

  @Override
  public final void rollbackTransaction()
  {
    throw new RuntimeException("Does not support transactions.");
  }

  @Override
  public final boolean isInTransaction()
  {
    throw new RuntimeException("Does not support transactions.");
  }

  @Override
  public void connect()
  {
    super.connect();

    try {
      connection.setAutoCommit(true);
    }
    catch(SQLException e) {
      throw new RuntimeException(e);
    }
  }

  @Override
  public long getCommittedWindowId(String appId, int operatorId)
  {
    Long lastWindowCommit = getCommittedWindowIdHelper(appId, operatorId);

    if(lastWindowCommit == null) {
      return -1L;
    }
    else {
      return lastWindowCommit;
    }
  }

  @Override
  public void disconnect()
  {
    try {
      super.disconnect();

      lastWindowFetchCommand.close();
      lastWindowInsertCommand.close();
    }
    catch (SQLException ex) {
      throw new RuntimeException(ex);
    }
  }
}