LongSequenceGenerator xref

View Javadoc

    1   /***
    2    *
    3    * Copyright 2004 Hiram Chirino
    4    *
    5    * Licensed under the Apache License, Version 2.0 (the "License");
    6    * you may not use this file except in compliance with the License.
    7    * You may obtain a copy of the License at
    8    *
    9    * http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   *
    17   **/
    18  package org.codehaus.activemq.util;
    19
    20
    21  /***
    22   * Generates sequence ids used to identify messages in the SQL
    23   * tables.
    24   *
    25   * @version $Revision: 1.2 $
    26   */
    27  public class LongSequenceGenerator {
    28
    29      long lastSequenceId=0;
    30
    31      public synchronized void setLastSequenceId(long value) {
    32          this.lastSequenceId=value;
    33      }
    34
    35      public synchronized long getLastSequenceId() {
    36          return this.lastSequenceId;
    37      }
    38
    39      public synchronized long getNextSequenceId() {
    40          return ++lastSequenceId;
    41      }
    42  }