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annotate src/org/dancres/blitz/entry/LeaseTracker.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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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.entry;
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2
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Dan Creswell <dan.creswell@gmail.com>
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3 import java.io.IOException;
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4
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5 import org.dancres.blitz.lease.ReapFilter;
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6
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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7 /**
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Dan Creswell <dan.creswell@gmail.com>
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8 <p>
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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9 Tracks the lease expiries for all EntrySleeves of a particular type.
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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10 </p>
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Dan Creswell <dan.creswell@gmail.com>
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11
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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12 <p>
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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13 When you are ready to process expired leases, invoke
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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14 <code>bringOutTheDead</code> which will cause the <code>LeaseTracker</code>
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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15 to pass one or more <code>TupleLocator<code> instances to the passed
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Dan Creswell <dan.creswell@gmail.com>
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16 <code>EntryReaper</code>. The <code>EntryReaper</code> should iterate
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17 through each Locator instance and do the following:
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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18 </p>
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19
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Dan Creswell <dan.creswell@gmail.com>
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20 <ol>
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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21 <li>Load the <code>EntrySleeve</code> associated with the UID</li>
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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22 <li>Check it has actually expired. Note that, due to caching, the version
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23 of the sleeve in cache may contain an updated expiry time which hasn't yet
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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24 been communicated to the <code>LeaseTracker</code>.</li>
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25 <li>If the <code>EntrySleeve</code> has expired, filter using appropriate
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26 <code>ReapFilter</code>s and mark the <code>EntrySleeve</code> for deletion
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27 assuming the filters don't boycott.</li>
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28 </ol>
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29
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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30 @see org.dancres.blitz.entry.TupleLocator
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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31 @see org.dancres.blitz.entry.EntryReaper
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Dan Creswell <dan.creswell@gmail.com>
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32 */
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33 public interface LeaseTracker {
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Dan Creswell <dan.creswell@gmail.com>
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34 /**
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Dan Creswell <dan.creswell@gmail.com>
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35 Locate expired entries and pass their UIDs to the specified filter.
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36 */
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Dan Creswell <dan.creswell@gmail.com>
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37 public void bringOutTheDead(EntryReaper aReaper) throws IOException;
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38
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39 public void delete(PersistentEntry anEntry) throws IOException;
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40
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41 public void update(PersistentEntry anEntry) throws IOException;
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Dan Creswell <dan.creswell@gmail.com>
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42
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Dan Creswell <dan.creswell@gmail.com>
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43 public void write(PersistentEntry anEntry) throws IOException;
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Dan Creswell <dan.creswell@gmail.com>
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44
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Dan Creswell <dan.creswell@gmail.com>
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45 public void close() throws IOException;
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Dan Creswell <dan.creswell@gmail.com>
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46
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Dan Creswell <dan.creswell@gmail.com>
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47 public void delete() throws IOException;
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48 }