third_party/tmb/src/java/DisconnectClient.java

//   Copyright 2014-2015 Quickstep Technologies LLC.
//
//   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 tmb.voltdb;

import org.voltdb.*;

public class DisconnectClient extends VoltProcedure {
  public final SQLStmt checkConnectedSQL = new SQLStmt(
      "SELECT client_id FROM client WHERE client_id = ? "
                                 + "AND disconnect_time IS NULL");
  public final SQLStmt disconnectClientSQL = new SQLStmt(
      "UPDATE client SET disconnect_time = NOW WHERE client_id = ?;");
  public final SQLStmt removeSenderEntriesSQL = new SQLStmt(
      "DELETE FROM sendable WHERE client_id = ?;");
  public final SQLStmt removeReceiverEntriesSQL = new SQLStmt(
      "DELETE FROM receivable WHERE client_id = ?;");
  public final SQLStmt removeQueuedMessagesSQL = new SQLStmt(
      "DELETE FROM queued_message WHERE receiver_id = ?;");

  public long run(int client_id) throws VoltAbortException {
    voltQueueSQL(checkConnectedSQL, EXPECT_ONE_ROW, client_id);
    voltQueueSQL(disconnectClientSQL, client_id);
    voltQueueSQL(removeSenderEntriesSQL, client_id);
    voltQueueSQL(removeReceiverEntriesSQL, client_id);
    voltQueueSQL(removeQueuedMessagesSQL, client_id);
    voltExecuteSQL();

    return 0;
  }
}