RoleBasedCacheNode.java

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package org.gffs.cache;
 
/*
 * Copyright 2006 University of Virginia
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may
 * obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions
 * and limitations under the License.
 */
 
import java.util.Date;
 
class RoleBasedCacheNode<KeyType, DataType>
{
  static public final int ROLE_LRU = 0;
  static public final int ROLE_TIMEOUT = 1;
  static private final int _NUM_ROLES = 2;
 
  private Object[] _next;
  private Object[] _previous;
 
  private KeyType _key;
  private DataType _data;
 
  private Date _invalidationDate;
 
  public RoleBasedCacheNode(KeyType key, DataType data, Date invalidationDate)
  {
    _next = new Object[_NUM_ROLES];
    _previous = new Object[_NUM_ROLES];
 
    for (int lcv = 0; lcv < _NUM_ROLES; lcv++) {
      _next[lcv] = null;
      _previous[lcv] = null;
    }
 
    _key = key;
    _data = data;
    _invalidationDate = invalidationDate;
  }
 
  public KeyType getKey()
  {
    return _key;
  }
 
  public DataType getData()
  {
    return _data;
  }
 
  public Date getInvalidationDate()
  {
    return _invalidationDate;
  }
 
  public void setInvalidationDate(long millisecondsFromNow)
  {
    _invalidationDate = new Date(System.currentTimeMillis() + millisecondsFromNow);
  }
 
  @SuppressWarnings("unchecked")
  public RoleBasedCacheNode<KeyType, DataType> getPrevious(int role)
  {
    return RoleBasedCacheNode.class.cast(_previous[role]);
  }
 
  @SuppressWarnings("unchecked")
  public RoleBasedCacheNode<KeyType, DataType> getNext(int role)
  {
    return RoleBasedCacheNode.class.cast(_next[role]);
  }
 
  public void setPrevious(int role, RoleBasedCacheNode<KeyType, DataType> previous)
  {
    _previous[role] = previous;
  }
 
  public void setNext(int role, RoleBasedCacheNode<KeyType, DataType> next)
  {
    _next[role] = next;
  }
 
  public void clearLinks(int role)
  {
    _previous[role] = null;
    _next[role] = null;
  }
 
  public void clearLinks()
  {
    for (int lcv = 0; lcv < _NUM_ROLES; lcv++)
      clearLinks(lcv);
  }
}