Coverage Report - ca.uhn.hl7v2.util.idgenerator.HiLoGenerator
 
Classes in this File Line Coverage Branch Coverage Complexity
HiLoGenerator
100%
20/20
100%
4/4
1.286
 
 1  
 /**
 2  
 The contents of this file are subject to the Mozilla Public License Version 1.1 
 3  
 (the "License"); you may not use this file except in compliance with the License. 
 4  
 You may obtain a copy of the License at http://www.mozilla.org/MPL/ 
 5  
 Software distributed under the License is distributed on an "AS IS" basis, 
 6  
 WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the 
 7  
 specific language governing rights and limitations under the License. 
 8  
 
 9  
 The Original Code is "HiLoGenerator.java".  Description: 
 10  
 "Abstract base class for HiLo ID Generators" 
 11  
 
 12  
 The Initial Developer of the Original Code is University Health Network. Copyright (C) 
 13  
 2001.  All Rights Reserved. 
 14  
 
 15  
 Contributor(s): ______________________________________. 
 16  
 
 17  
 Alternatively, the contents of this file may be used under the terms of the 
 18  
 GNU General Public License (the  "GPL"), in which case the provisions of the GPL are 
 19  
 applicable instead of those above.  If you wish to allow use of your version of this 
 20  
 file only under the terms of the GPL and not to allow others to use your version 
 21  
 of this file under the MPL, indicate your decision by deleting  the provisions above 
 22  
 and replace  them with the notice and other provisions required by the GPL License.  
 23  
 If you do not delete the provisions above, a recipient may use your version of 
 24  
 this file under either the MPL or the GPL. 
 25  
  */
 26  
 package ca.uhn.hl7v2.util.idgenerator;
 27  
 
 28  
 import java.io.IOException;
 29  
 
 30  
 import org.slf4j.Logger;
 31  
 import org.slf4j.LoggerFactory;
 32  
 
 33  
 /**
 34  
  * Abstract base class for a HiLo-style generator that cheaply generates "lo"
 35  
  * IDs in memory but only seldomly increments (potentially more expensive) a
 36  
  * "hi" ID, e.g. in a persistent store. The combination of "lo" and "hi" ID
 37  
  * becomes the final ID returned to the caller.
 38  
  * 
 39  
  * @author Christian Ohr
 40  
  */
 41  464
 public abstract class HiLoGenerator extends IDGenerator.OrderedSupport {
 42  
 
 43  1
         private static final Logger LOG = LoggerFactory
 44  
                         .getLogger(HiLoGenerator.class.getName());
 45  
 
 46  464
         private int lo = 0;
 47  464
         private int base = -1;
 48  
 
 49  
         public synchronized String getID() throws IOException {
 50  2809
                 if (base < 0) {
 51  97
                         LOG.debug("Obtain next hi ID");
 52  97
                         base = nextBase();
 53  
                 }
 54  2809
                 if (getNextLoId() >= getMaxLo()) {
 55  26
                         LOG.debug("Obtain next hi ID");
 56  26
                         base = nextBase();
 57  
                 }
 58  2809
                 return Integer.toString(base + lo);
 59  
         }
 60  
 
 61  
         private int nextBase() throws IOException {
 62  123
                 int base = getNextHiId();
 63  123
                 lo = 0;
 64  123
                 return base;
 65  
         }
 66  
 
 67  
         protected abstract int getNextHiId() throws IOException;
 68  
 
 69  
         protected abstract void resetHiId();
 70  
 
 71  
         protected int getNextLoId() {
 72  2809
                 lo++;
 73  2809
                 return lo;
 74  
         }
 75  
 
 76  
         public void reset() {
 77  4
                 lo = 0;
 78  4
                 base = -1;
 79  4
                 resetHiId();
 80  4
         }
 81  
 
 82  
         abstract public int getMaxLo();
 83  
 
 84  
 }