Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/entry/ci/FifoCacheLines.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 java.util.ArrayList;
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4
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5 import com.go.trove.util.IntHashMap;
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6
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7 import org.dancres.blitz.entry.TupleLocator;
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8 import org.dancres.blitz.entry.EntrySleeve;
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9
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10 /**
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11 Maintains a set of cache lines (key'd by hashcode) for a particular
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12 field of one type of Entry.
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13 */
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14 class FifoCacheLines implements CacheLines {
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15 private IntHashMap theHashCodes = new IntHashMap();
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16 private int theOffset;
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17 private String theName;
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18
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19 FifoCacheLines(int anOffset, String aName) {
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20 theOffset = anOffset;
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21 theName = aName;
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22 }
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23
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24 public String getName() {
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25 return theName;
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26 }
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27
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28 public TupleLocator getIds(int aHashcode) {
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29 FifoCacheLine myEntries = getLine(aHashcode, false);
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30
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31 if (myEntries == null)
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32 return ArrayLocatorImpl.EMPTY_LOCATOR;
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33
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34 synchronized(myEntries) {
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35 return myEntries.getLocator();
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36 }
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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 public int getSize(int aHashcode) {
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43 FifoCacheLine 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 synchronized(myEntries) {
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49 return myEntries.getSize();
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50 }
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51 }
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52
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53 /**
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54 @return the number of different hashcodes we know about
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55 */
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56 public int getSize() {
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57 synchronized(theHashCodes) {
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58 return theHashCodes.size();
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59 }
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60 }
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61
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62 public void insert(EntrySleeve aSleeve) {
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63 int myKey = getKey(aSleeve);
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64
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65 synchronized(theHashCodes) {
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66 FifoCacheLine myEntries = getLine(myKey, true);
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67
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68 synchronized (myEntries) {
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69 myEntries.insert(aSleeve);
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70 }
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71 }
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72 }
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73
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74 public void remove(EntrySleeve aSleeve) {
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75 int myKey = getKey(aSleeve);
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76
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77 synchronized(theHashCodes) {
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78 FifoCacheLine myEntries = getLine(myKey, false);
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79
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80 synchronized(myEntries) {
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81 myEntries.remove(aSleeve);
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82 }
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83
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84 if (myEntries.getSize() == 0)
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85 theHashCodes.remove(myKey);
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86 }
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87 }
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88
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89 private int getKey(EntrySleeve aSleeve) {
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90 int myHash = aSleeve.getHashCodeForField(theOffset);
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91
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92 return myHash;
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93 }
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94
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95 private FifoCacheLine getLine(int aKey, boolean doCreate) {
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96 FifoCacheLine myEntries;
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97
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98 synchronized(theHashCodes) {
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99 myEntries = (FifoCacheLine) theHashCodes.get(aKey);
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100
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101 if ((myEntries == null) && doCreate) {
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102 myEntries = new FifoCacheLine();
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103 theHashCodes.put(aKey, myEntries);
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104 }
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105 }
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106
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107 return myEntries;
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108 }
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109 }