RepositoryIdCache_1_3_1


1   /*
2    * @(#)RepositoryIdCache_1_3_1.java 1.5 03/12/19
3    *
4    * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
5    * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
6    */
7   
8   package com.sun.corba.se.impl.orbutil;
9   
10  import java.util.Stack  ;
11  import java.util.Hashtable  ;
12  import java.util.EmptyStackException  ;
13  import java.util.Enumeration  ;
14  
15  // Really limited pool - in this case just creating several at a time...
16  class RepositoryIdPool_1_3_1 extends Stack   {
17      
18      private static int MAX_CACHE_SIZE = 4;
19      private RepositoryIdCache_1_3_1 cache;
20      
21      public final synchronized RepositoryId_1_3_1 popId() {
22  
23          try {
24              return (RepositoryId_1_3_1)super.pop();
25          }
26          catch(EmptyStackException   e) {
27              increasePool(5);
28              return (RepositoryId_1_3_1)super.pop();
29          }
30  
31      }
32  
33      // Pool management
34      final void increasePool(int size) {
35          //if (cache.size() <= MAX_CACHE_SIZE)
36      for (int i = size; i > 0; i--)
37          push(new RepositoryId_1_3_1());
38          /*
39        // _REVISIT_ This will not work w/out either thread tracing or weak references.  I am
40        // betting that thread tracing almost completely negates benefit of reuse.  Until either
41        // 1.2 only inclusion or proof to the contrary, I'll leave it this way...
42        else {
43        int numToReclaim = cache.size() / 2;
44        Enumeration keys = cache.keys();
45        Enumeration elements = cache.elements();
46        for (int i = numToReclaim; i > 0; i--) {
47        Object key = keys.nextElement();
48        Object element = elements.nextElement();
49                  
50        push(element);
51        cache.remove(key);
52        }
53        }
54          */
55      }
56      
57      final void setCaches(RepositoryIdCache_1_3_1 cache) {
58          this.cache = cache;  
59      }
60  
61  }
62  
63  public class RepositoryIdCache_1_3_1 extends Hashtable   {
64  
65      private RepositoryIdPool_1_3_1 pool = new RepositoryIdPool_1_3_1();
66      
67      public RepositoryIdCache_1_3_1() {
68          pool.setCaches(this);    
69      }
70      
71      public final synchronized RepositoryId_1_3_1 getId(String   key) {
72          RepositoryId_1_3_1 repId = (RepositoryId_1_3_1)super.get(key);
73  
74          if (repId != null)
75              return repId;
76          else {
77              //repId = pool.popId().init(key);
78          repId = new RepositoryId_1_3_1(key);
79              put(key, repId);
80              return repId;
81          }
82  
83      }
84  }
85  
86  
87
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