PageManager


1   package com.quadcap.sql.file;
2   
3   /* Copyright 1997 - 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.IOException  ;
42  import java.io.InputStream  ;
43  import java.io.OutputStream  ;
44  
45  /**
46   * Interface to be implemented by page (and sub-page) allocators.
47   *
48   * @author Stan Bailes
49   */
50  public interface PageManager {
51      /**
52       * Allocate a new page.
53       */
54      public long newPage() throws IOException  ;
55  
56      /**
57       * Free a page.
58       *
59       * @param page a previously allocated page
60       */
61      public void freePage(long page) throws IOException  ;
62  
63      /**
64       * Return this manager's page size
65       */
66      public int getPageSize();
67  
68      /**
69       * Return the specified page
70       */
71      public Page getPage(long page) throws IOException  ;
72  
73      /**
74       * Return the file lock
75       */
76      public Object   getLock();
77  }
78
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