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MemoryStMan.h
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1 //# MemoryStMan.h: Storage manager for tables using memory
2 //# Copyright (C) 2003
3 //# Associated Universities, Inc. Washington DC, USA.
4 //#
5 //# This library is free software; you can redistribute it and/or modify it
6 //# under the terms of the GNU Library General Public License as published by
7 //# the Free Software Foundation; either version 2 of the License, or (at your
8 //# option) any later version.
9 //#
10 //# This library is distributed in the hope that it will be useful, but WITHOUT
11 //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 //# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
13 //# License for more details.
14 //#
15 //# You should have received a copy of the GNU Library General Public License
16 //# along with this library; if not, write to the Free Software Foundation,
17 //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
18 //#
19 //# Correspondence concerning AIPS++ should be addressed as follows:
20 //# Internet email: aips2-request@nrao.edu.
21 //# Postal address: AIPS++ Project Office
22 //# National Radio Astronomy Observatory
23 //# 520 Edgemont Road
24 //# Charlottesville, VA 22903-2475 USA
25 //#
26 //# $Id$
27 
28 #ifndef TABLES_MEMORYSTMAN_H
29 #define TABLES_MEMORYSTMAN_H
30 
31 
32 //# Includes
33 #include <casacore/casa/aips.h>
35 
36 
37 namespace casacore { //# NAMESPACE CASACORE - BEGIN
38 
39 // <summary>
40 // Memory-based table storage manager class
41 // </summary>
42 
43 // <use visibility=export>
44 
45 // <reviewed reviewer="UNKNOWN" date="before2004/08/25" tests="">
46 // </reviewed>
47 
48 // <prerequisite>
49 //# Classes you should understand before using this one.
50 // <li> <linkto class=DataManager>DataManager</linkto>
51 // <li> <linkto class=MSMColumn>MSMColumn</linkto>
52 // </prerequisite>
53 
54 // <synopsis>
55 // MemoryStMan is a table storage manager based in memory.
56 // It holds all data in the columns in memory and deletes them
57 // when the table gets closed.
58 // It contains pointers to the underlying MSMColumn objects,
59 // which do the actual data handling.
60 //
61 // The Memory storage manager does fully support addition and removal
62 // of rows and columns.
63 //
64 // The primary use of this storage manager is for a memory-based table,
65 // but it can also be used for temporary columns in disk-based tables.
66 // When reopening a disk-based table, possible columns stored with
67 // MemoryStMan will be initialized to 0.
68 // An important issue is synchronizing tables containing MemoryStMan
69 // storage managers in case of concurrent access. Because its data are
70 // not stored on disk, there is no way to synchronize the data if another
71 // process changed data or added or deleted rows. If the number or rows
72 // has changed, rows will be added or deleted as needed. Row deletion
73 // will be done at the end of the table.
74 // </synopsis>
75 
76 //# <todo asof="$DATE:$">
77 //# A List of bugs, limitations, extensions or planned refinements.
78 //# </todo>
79 
80 
81 class MemoryStMan: public MSMBase
82 {
83 public:
84  // Create an Memory storage manager.
85  // Its name will be blank.
86  MemoryStMan();
87 
88  // Create an Memory storage manager with the given name.
89  // Its name can be used later in e.g. Table::addColumn to
90  // add a column to this storage manager.
91  MemoryStMan (const String& storageManagerName);
92 
93  ~MemoryStMan();
94 };
95 
96 
97 
98 } //# NAMESPACE CASACORE - END
99 
100 #endif
MemoryStMan()
Create an Memory storage manager.
Base class for memory-based table storage manager class.
Definition: MSMBase.h:67
Memory-based table storage manager class.
Definition: MemoryStMan.h:81
String: the storage and methods of handling collections of characters.
Definition: String.h:223
#define casacore
&lt;X11/Intrinsic.h&gt; #defines true, false, casacore::Bool, and String.
Definition: X11Intrinsic.h:42