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comparison src/org/dancres/blitz/meta/Registry.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
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1 package org.dancres.blitz.meta;
2
3 import java.io.IOException;
4
5 import org.dancres.blitz.disk.DiskTxn;
6
7 /**
8 <p><code>Registry</code> is a container for a related set of meta data.</p>
9
10 <p>Various pieces of ad-hoc information need to be retained within Blitz.
11 Chances are that some of this information belongs in a logical group hence
12 we allow for creation of more than one <code>Registry</code> each of which is identified
13 by a unique name. <P>
14
15 <p>Just like all the other storage within Blitz, the content of <code>Registry</code>
16 instances has to be kept sync'd (the user may also generate log information
17 depending on whether they choose to in-line update or log and sync). Thus,
18 most users of <code>Registry</code> will implement <code>Syncable</code>.
19 </p>
20
21 <p>All modifications to <code>Registry</code> content are achieved through
22 a <code>RegistryAccessor</code>.
23
24 @see org.dancres.blitz.disk.Syncable
25 @see org.dancres.blitz.meta.RegistryAccessor
26 */
27 public interface Registry {
28 /**
29 Obtain an instance of an accessor which will read or make modifications
30 in the current context transaction.
31 */
32 public RegistryAccessor getAccessor() throws IOException;
33
34 /**
35 Obtain an instance of an accessor which will read or make modifications
36 in the specified transaction.context.
37 */
38 public RegistryAccessor getAccessor(DiskTxn aTxn) throws IOException;
39
40 public void close() throws IOException;
41 }