Log0


1   package com.quadcap.sql.file;
2   
3   /* Copyright 1999 - 2003 Quadcap Software.  All rights reserved.
4    *
5    * This software is distributed under the Quadcap Free Software License.
6    * This software may be used or modified for any purpose, personal or
7    * commercial.  Open Source redistributions are permitted.  Commercial
8    * redistribution of larger works derived from, or works which bundle
9    * this software requires a "Commercial Redistribution License"; see
10   * http://www.quadcap.com/purchase.
11   *
12   * Redistributions qualify as "Open Source" under  one of the following terms:
13   *   
14   *    Redistributions are made at no charge beyond the reasonable cost of
15   *    materials and delivery.
16   *
17   *    Redistributions are accompanied by a copy of the Source Code or by an
18   *    irrevocable offer to provide a copy of the Source Code for up to three
19   *    years at the cost of materials and delivery.  Such redistributions
20   *    must allow further use, modification, and redistribution of the Source
21   *    Code under substantially the same terms as this license.
22   *
23   * Redistributions of source code must retain the copyright notices as they
24   * appear in each source code file, these license terms, and the
25   * disclaimer/limitation of liability set forth as paragraph 6 below.
26   *
27   * Redistributions in binary form must reproduce this Copyright Notice,
28   * these license terms, and the disclaimer/limitation of liability set
29   * forth as paragraph 6 below, in the documentation and/or other materials
30   * provided with the distribution.
31   *
32   * The Software is provided on an "AS IS" basis.  No warranty is
33   * provided that the Software is free of defects, or fit for a
34   * particular purpose.  
35   *
36   * Limitation of Liability. Quadcap Software shall not be liable
37   * for any damages suffered by the Licensee or any third party resulting
38   * from use of the Software.
39   */
40  
41  import java.io.File  ;
42  import java.io.IOException  ;
43  
44  import java.util.Properties  ;
45  
46  import com.quadcap.sql.lock.Transaction;
47  
48  /**
49   * Interface to logging subsystem.
50   *
51   * @author Stan Bailes
52   */
53  public class Log0 implements Log {
54      Datafile                            db;
55      /**
56       * Initialize the logging subsystem
57       */
58      public void init(Datafile db, boolean create, Properties   props)
59      throws IOException  
60      {
61          this.db = db;
62      }
63  
64      /**
65       * Start the logging subsystem
66       */
67      public void start() {}
68  
69      /**
70       * Return the database that we're logging for
71       */
72      public Datafile getDatafile() { return db; }
73  
74      /**
75       * Return the database root directory
76       */
77      public File   getDbRootDir() { return db.getDbRootDir(); }
78  
79      /**
80       * Add a transaction's log record to the end of the open log file
81       */
82      public void addEntry(LogEntry entry) throws IOException   {}
83  
84      /**
85       * XXX why public?
86       */
87      public void reallyAddEntry(LogEntry entry) throws IOException   {}
88      
89      /**
90       * Flush and close the log file.
91       */
92      public void close() throws IOException   {}
93      
94      /**
95       * Flush all log records to disk. 
96       */
97      public void flushLog() throws IOException   {}
98  
99      /**
100      * Perform a checkpoint operation.
101      */
102     public void checkpoint() throws IOException   {}
103 
104     /**
105      * Wait for all queue ops to be processed by the log sync thread
106      */
107     public void sync() throws IOException   {}
108 
109     /**
110      * Transaction rollback.
111      */
112     public void rollbackTransaction(Transaction trans) throws IOException   {}
113         
114     /**
115      * Statement rollback.
116      */
117     public void rollbackStatement(Transaction trans, int stmtId)
118     throws IOException  
119     {
120     }
121 
122     /**
123      * Restart from a previous state
124      */
125     public void restart() throws Exception   {}
126 
127     /**
128      * Retrieve a row mapping.
129      */
130     public long getRowMap(long rowId) { return rowId; }
131 
132     /**
133      * Remember a row mapping {old,new}  The old row (logRow) is now stored
134      * in a new place (fileRow), so any stored log entries that refer to
135      * the old row need to be translated to use the new row.
136      *
137      * @param logRow the "old" row
138      * @param fileRow the "new" row
139      */
140     public void putRowMap(long logRow, long fileRow) {}
141 
142     /**
143      * Discard a row mapping
144      */
145     public void removeRowMap(long row) {}
146 
147     /**
148      * Are you logging?
149      *
150      * No, I am not.
151      */
152     public boolean isLogging() { return false; }
153 
154     /**
155      * Save a "before" image
156      */
157     public void saveBlock(long b) throws IOException   {
158     }
159 
160     /**
161      * Restore all the "before" images
162      */
163     public void restoreBlocks() throws IOException   {
164     }
165 
166     /**
167      * Reset the "before" list to be empty
168      */
169     public void resetBlocks() throws IOException   {
170     }
171 
172     /**
173      * Remove the log file
174      */
175     public void remove() {
176     }
177 
178     /**
179      * We don't recover because we never miss.
180      */
181     public boolean inRecovery() { return false; }
182     
183 }
184 
185
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Popular Tags