kona/src/org/gffs/cache/RoleBasedCacheNode.java

   1 package org.gffs.cache;
   2
   3 /*
   4  * Copyright 2006 University of Virginia
   5  *
   6  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may
   7  * 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 distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions
  13  * and limitations under the License.
  14  */
  15
  16 import java.util.Date;
  17
  18 class RoleBasedCacheNode<KeyType, DataType>
  19 {
  20         static public final int ROLE_LRU = 0;
  21         static public final int ROLE_TIMEOUT = 1;
  22         static private final int _NUM_ROLES = 2;
  23
  24         private Object[] _next;
  25         private Object[] _previous;
  26
  27         private KeyType _key;
  28         private DataType _data;
  29
  30         private Date _invalidationDate;
  31
  32         public RoleBasedCacheNode(KeyType key, DataType data, Date invalidationDate)
  33         {
  34                 _next = new Object[_NUM_ROLES];
  35                 _previous = new Object[_NUM_ROLES];
  36
  37                 for (int lcv = 0; lcv < _NUM_ROLES; lcv++) {
  38                         _next[lcv] = null;
  39                         _previous[lcv] = null;
  40                 }
  41
  42                 _key = key;
  43                 _data = data;
  44                 _invalidationDate = invalidationDate;
  45         }
  46
  47         public KeyType getKey()
  48         {
  49                 return _key;
  50         }
  51
  52         public DataType getData()
  53         {
  54                 return _data;
  55         }
  56
  57         public Date getInvalidationDate()
  58         {
  59                 return _invalidationDate;
  60         }
  61
  62         public void setInvalidationDate(long millisecondsFromNow)
  63         {
  64                 _invalidationDate = new Date(System.currentTimeMillis() + millisecondsFromNow);
  65         }
  66
  67         @SuppressWarnings("unchecked")
  68         public RoleBasedCacheNode<KeyType, DataType> getPrevious(int role)
  69         {
  70                 return RoleBasedCacheNode.class.cast(_previous[role]);
  71         }
  72
  73         @SuppressWarnings("unchecked")
  74         public RoleBasedCacheNode<KeyType, DataType> getNext(int role)
  75         {
  76                 return RoleBasedCacheNode.class.cast(_next[role]);
  77         }
  78
  79         public void setPrevious(int role, RoleBasedCacheNode<KeyType, DataType> previous)
  80         {
  81                 _previous[role] = previous;
  82         }
  83
  84         public void setNext(int role, RoleBasedCacheNode<KeyType, DataType> next)
  85         {
  86                 _next[role] = next;
  87         }
  88
  89         public void clearLinks(int role)
  90         {
  91                 _previous[role] = null;
  92                 _next[role] = null;
  93         }
  94
  95         public void clearLinks()
  96         {
  97                 for (int lcv = 0; lcv < _NUM_ROLES; lcv++)
  98                         clearLinks(lcv);
  99         }
 100 }