001    /**
002     * 
003     * Copyright 2004 Hiram Chirino
004     * 
005     * Licensed under the Apache License, Version 2.0 (the "License"); 
006     * you may not use this file except in compliance with the License. 
007     * You may obtain a copy of the License at 
008     * 
009     * http://www.apache.org/licenses/LICENSE-2.0
010     * 
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS, 
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
014     * See the License for the specific language governing permissions and 
015     * limitations under the License. 
016     * 
017     **/
018    package org.activemq.util;
019    
020    
021    /**
022     * Generates sequence ids used to identify messages in the SQL
023     * tables.
024     * 
025     * @version $Revision: 1.1.1.1 $
026     */
027    public class LongSequenceGenerator {
028    
029        long lastSequenceId=0;
030        
031        public synchronized void setLastSequenceId(long value) {
032            this.lastSequenceId=value;
033        }
034    
035        public synchronized long getLastSequenceId() {
036            return this.lastSequenceId;
037        }
038        
039        public synchronized long getNextSequenceId() {
040            return ++lastSequenceId;
041        }
042    }