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1   /*** 
2    * 
3    * Copyright 2004 Protique Ltd
4    * 
5    * Licensed under the Apache License, Version 2.0 (the "License"); 
6    * you may not use this file except in compliance with the License. 
7    * You may 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
12   * distributed under the License is distributed on an "AS IS" BASIS, 
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
14   * See the License for the specific language governing permissions and 
15   * limitations under the License. 
16   * 
17   **/
18  package org.activecluster.group;
19  
20  import org.activecluster.Node;
21  
22  /***
23   * A kind of {@link GroupModel} in which every {@link Node} has its
24   * own {@link Group} and other nodes in the cluster act as buddies (slaves)
25   *
26   * @version $Revision: 1.1 $
27   */
28  public class BuddyGroupModel extends GroupModel {
29  
30      public synchronized void addNode(Node node) {
31          Group group = makeNewGroup(node);
32          if (group == null) {
33              if (!addToExistingGroup(node)) {
34                  addToUnusedNodes(node);
35              }
36          }
37          else {
38              // now lets try choose some existing nodes to add as buddy's
39              tryToFillGroupWithBuddies(group);
40              
41              // now that the group may well be filled, add it to the collections
42              addGroup(group);
43          }
44      }
45  
46  }