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annotate src/org/dancres/blitz/entry/ci/BitCacheLine.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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.ci;
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2
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3 import java.util.Set;
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4 import java.util.HashSet;
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5
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6 import java.util.ArrayList;
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7 import java.util.LinkedList;
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8 import java.util.List;
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9
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10 import org.dancres.blitz.entry.TupleLocator;
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11 import org.dancres.blitz.entry.EntrySleeve;
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12
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13 import org.dancres.struct.BitIndex;
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14
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15 /**
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16 Maintains a list of all entries with the same hashcode for a particular
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17 field.
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18 */
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19 class BitCacheLine {
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20 private BitIndex theIndex;
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21
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22 BitCacheLine(int aSize) {
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23 theIndex = new BitIndex(aSize);
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24 }
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25
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26 BitIndex getSlots() {
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27 // return theIndex.copy();
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28 /*
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29 We can afford to return the live reference because anything new
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30 will be considered a recent write and caught elsewhere.
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31
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32 Anything that moves out of cache and thus we miss will be moving
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33 down the cache hierarchy which we will also search. Ultimately
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34 in the worst case we'll find the match on disk. Note that
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35 WriteBuffer will not flush it's dirty cache (which we search)
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36 until the entry has been forced to disk. This ensures that we
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37 cannot chase the Entry through all the caches and ultimately miss
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38 it.
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39 */
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40 return theIndex;
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41 }
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42
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43 void insert(EntrySleeve aSleeve, int aSlot) {
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44 theIndex.set(aSlot);
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45 }
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46
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47 void remove(EntrySleeve aSleeve, int aSlot) {
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48 theIndex.clear(aSlot);
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49 }
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50
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51 int getSize() {
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52 return theIndex.count();
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53 }
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54 }