Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/entry/ci/BitCacheLines.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.
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1 package org.dancres.blitz.entry.ci;
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2
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3 import com.go.trove.util.IntHashMap;
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4
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5 import org.dancres.blitz.entry.EntrySleeve;
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6
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7 import org.dancres.struct.BitIndex;
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8
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9 /**
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10 Maintains a set of cache lines (key'd by hashcode) for a particular
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11 field of one type of Entry.
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12 */
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13 class BitCacheLines {
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14 private IntHashMap theHashCodes = new IntHashMap();
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15 private int theOffset;
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16 private String theName;
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17
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18 private int theSize;
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19
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20 BitCacheLines(int anOffset, String aName, int aSize) {
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21 theOffset = anOffset;
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22 theName = aName;
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23 theSize = aSize;
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24 }
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25
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26 String getName() {
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27 return theName;
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28 }
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29
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30 BitIndex getHits(int aHashcode) {
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31 BitCacheLine myEntries = getLine(aHashcode, false);
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32
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33 if (myEntries == null)
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34 return null;
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35
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36 return myEntries.getSlots();
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37 }
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38
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39 /**
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40 @return the number of entries under a particular hashcode
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41 */
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42 int getSize(int aHashcode) {
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43 BitCacheLine myEntries = getLine(aHashcode, false);
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44
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45 if (myEntries == null)
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46 return 0;
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47
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48 return myEntries.getSize();
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49 }
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50
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51 /**
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52 @return the number of different hashcodes we know about
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53 */
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54 int getSize() {
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55 synchronized(theHashCodes) {
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56 return theHashCodes.size();
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57 }
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58 }
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59
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60 void insert(EntrySleeve aSleeve, int aSlot) {
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61 int myKey = getKey(aSleeve);
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62
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63 synchronized(theHashCodes) {
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64 BitCacheLine myEntries = getLine(myKey, true);
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65 myEntries.insert(aSleeve, aSlot);
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66 }
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67 }
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68
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69 void remove(EntrySleeve aSleeve, int aSlot) {
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70 int myKey = getKey(aSleeve);
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71
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72 synchronized (theHashCodes) {
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73 BitCacheLine myEntries = getLine(myKey, false);
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74
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75 myEntries.remove(aSleeve, aSlot);
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76
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77 if (myEntries.getSize() == 0)
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78 theHashCodes.remove(myKey);
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79 }
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80 }
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81
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82 private int getKey(EntrySleeve aSleeve) {
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83 int myHash = aSleeve.getHashCodeForField(theOffset);
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84
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85 return myHash;
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86 }
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87
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88 private synchronized BitCacheLine getLine(int aKey, boolean doCreate) {
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89 BitCacheLine myEntries;
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90
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91 myEntries = (BitCacheLine) theHashCodes.get(aKey);
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92
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93 if ((myEntries == null) && doCreate) {
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94 myEntries = new BitCacheLine(theSize);
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95 theHashCodes.put(aKey, myEntries);
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96 }
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97
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98 return myEntries;
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99 }
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100 }