LRUList.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.
 */
 
 
class LRUList<KeyType, DataType> extends CacheList<KeyType, DataType>
{
  public LRUList()
  {
    super(RoleBasedCacheNode.ROLE_LRU);
  }
 
  @Override
  public void insert(RoleBasedCacheNode<KeyType, DataType> node)
  {
    // LRU inserts ALWAYS go at the tail
    if (_tail == null) {
      _head = _tail = node;
      return;
    }
 
    _tail.setNext(_myRole, node);
    node.setPrevious(_myRole, _tail);
    _tail = node;
  }
 
  public void noteUse(RoleBasedCacheNode<KeyType, DataType> node)
  {
    remove(node);
    insert(node);
  }
}