1 /*
2    Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
3 
4    This program is free software; you can redistribute it and/or modify
5    it under the terms of the GNU General Public License, version 2.0,
6    as published by the Free Software Foundation.
7 
8    This program is also distributed with certain software (including
9    but not limited to OpenSSL) that is licensed under separate terms,
10    as designated in a particular file or component or in included license
11    documentation.  The authors of MySQL hereby grant you an additional
12    permission to link the program and your derivative works with the
13    separately licensed software that they have included with MySQL.
14 
15    This program is distributed in the hope that it will be useful,
16    but WITHOUT ANY WARRANTY; without even the implied warranty of
17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18    GNU General Public License, version 2.0, for more details.
19 
20    You should have received a copy of the GNU General Public License
21    along with this program; if not, write to the Free Software
22    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
23 */
24 
25 #ifndef LOGHANDLERLIST_H
26 #define LOGHANDLERLIST_H
27 
28 class LogHandler;
29 #include <ndb_global.h>
30 
31 /**
32  * Provides a simple linked list of log handlers.
33  *
34  * @see LogHandler
35  * @version #@ $Id: LogHandlerList.hpp,v 1.2 2002/03/14 13:07:21 eyualex Exp $
36  */
37 class LogHandlerList
38 {
39 public:
40   /**
41    * Default Constructor.
42    */
43   LogHandlerList();
44 
45   /**
46    * Destructor.
47    */
48   ~LogHandlerList();
49 
50   /**
51    * Adds a new log handler.
52    *
53    * @param pNewHandler log handler.
54    */
55   bool add(LogHandler* pNewHandler);
56 
57   /**
58    * Removes a log handler from the list and call its destructor.
59    *
60    * @param pRemoveHandler the handler to remove
61    */
62   bool remove(LogHandler* pRemoveHandler);
63 
64   /**
65    * Removes all log handlers.
66    */
67   void removeAll();
68 
69   /**
70    * Returns the next log handler in the list.
71    * returns a log handler or NULL.
72    */
73   LogHandler* next();
74 
75   /**
76    * Returns the size of the list.
77    */
78   int size() const;
79 private:
80   /** List node */
81   struct LogHandlerNode
82   {
83     LogHandlerNode* pPrev;
84     LogHandlerNode* pNext;
85     LogHandler* pHandler;
86   };
87 
88   LogHandlerNode* next(LogHandlerNode* pNode);
89   LogHandlerNode* prev(LogHandlerNode* pNode);
90 
91   void removeNode(LogHandlerNode* pNode);
92 
93   int m_size;
94 
95   LogHandlerNode* m_pHeadNode;
96   LogHandlerNode* m_pTailNode;
97   LogHandlerNode* m_pCurrNode;
98 };
99 
100 #endif
101 
102 
103