third_party/src/tmb/src/java/CancelMessages.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 tmb.voltdb;

import org.voltdb.*;

public class CancelMessages extends VoltProcedure {
  public final SQLStmt getCancellableMessagesSQL = new SQLStmt(
      "SELECT message_id FROM cancellable_message WHERE message_id IN ?;");
  public final SQLStmt deleteCancellableMessageSQL = new SQLStmt(
      "DELETE FROM cancellable_message WHERE message_id = ?;");
  public final SQLStmt deleteQueuedMessagesSQL = new SQLStmt(
      "DELETE FROM queued_message WHERE message_id = ?;");

  public long run(long[] message_ids) throws VoltAbortException {
    voltQueueSQL(getCancellableMessagesSQL, (Object)message_ids);
    VoltTable[] cancellable_result = voltExecuteSQL();
    if (cancellable_result[0].getRowCount() == 0) {
      return 0;
    }

    VoltTableRow receiver_row = cancellable_result[0].fetchRow(0);
    receiver_row.resetRowPosition();
    while (receiver_row.advanceRow()) {
      voltQueueSQL(deleteCancellableMessageSQL, receiver_row.getLong(0));
      voltQueueSQL(deleteQueuedMessagesSQL, receiver_row.getLong(0));
    }

    voltExecuteSQL();
    return 0;
  }
}