Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/entry/ci/FifoCacheLines.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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0
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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 } |