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annotate src/org/dancres/blitz/meta/Registry.java @ 35:6f68e94c1fb8 default tip

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Add CondensedStats monitoring utility, equivalent to vmstat
author Dominic Cleal <dominic-cleal@cdo2.com>
date Thu, 05 Aug 2010 11:07:25 +0100
parents 3dc0c5604566
children
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3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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1 package org.dancres.blitz.meta;
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2
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3 import java.io.IOException;
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4
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5 import org.dancres.blitz.disk.DiskTxn;
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6
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7 /**
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8 <p><code>Registry</code> is a container for a related set of meta data.</p>
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9
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10 <p>Various pieces of ad-hoc information need to be retained within Blitz.
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11 Chances are that some of this information belongs in a logical group hence
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12 we allow for creation of more than one <code>Registry</code> each of which is identified
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13 by a unique name. <P>
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15 <p>Just like all the other storage within Blitz, the content of <code>Registry</code>
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16 instances has to be kept sync'd (the user may also generate log information
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17 depending on whether they choose to in-line update or log and sync). Thus,
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18 most users of <code>Registry</code> will implement <code>Syncable</code>.
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19 </p>
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20
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21 <p>All modifications to <code>Registry</code> content are achieved through
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22 a <code>RegistryAccessor</code>.
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24 @see org.dancres.blitz.disk.Syncable
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25 @see org.dancres.blitz.meta.RegistryAccessor
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26 */
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27 public interface Registry {
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28 /**
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29 Obtain an instance of an accessor which will read or make modifications
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30 in the current context transaction.
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31 */
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32 public RegistryAccessor getAccessor() throws IOException;
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33
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34 /**
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35 Obtain an instance of an accessor which will read or make modifications
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36 in the specified transaction.context.
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37 */
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38 public RegistryAccessor getAccessor(DiskTxn aTxn) throws IOException;
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39
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40 public void close() throws IOException;
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41 }