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1   /***
2    *  Copyright 2003-2010 Terracotta, Inc.
3    *
4    *  Licensed under the Apache License, Version 2.0 (the "License");
5    *  you may not use this file except in compliance with the License.
6    *  You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   *  Unless required by applicable law or agreed to in writing, software
11   *  distributed under the License is distributed on an "AS IS" BASIS,
12   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   *  See the License for the specific language governing permissions and
14   *  limitations under the License.
15   */
16  
17  package net.sf.ehcache.hibernate.management.impl;
18  
19  /***
20   * @author gkeim
21   * 
22   */
23  public class AggregateCacheRegionStats extends CacheRegionStats {
24      private int nodeCount;
25  
26      /***
27       * @param region
28       */
29      public AggregateCacheRegionStats(String region) {
30          super(region);
31      }
32  
33      /***
34       * @param stats
35       */
36      public void aggregate(CacheRegionStats stats) {
37          nodeCount++;
38          hitCount += stats.getHitCount();
39          missCount += stats.getMissCount();
40          putCount += stats.getPutCount();
41          hitRatio = determineHitRatio();
42  
43          // just add the in memory count together, an average will be returned when the getter is used
44          elementCountInMemory += stats.getElementCountInMemory();
45  
46          // the largest element count on disk is the one that is the most correct
47          if (stats.getElementCountOnDisk() > elementCountOnDisk) {
48              elementCountOnDisk = stats.getElementCountOnDisk();
49          }
50          // elementCountTotal is the same for each node, since it's the total count in the cluster
51          // no real aggregation is needed, just use the same total count
52          elementCountTotal = stats.getElementCountTotal();
53      }
54  
55      /***
56       * @see net.sf.ehcache.hibernate.management.impl.CacheRegionStats#getElementCountInMemory()
57       */
58      @Override
59      public long getElementCountInMemory() {
60          return elementCountInMemory / nodeCount;
61      }
62  }