Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/entry/ci/BitCacheLines.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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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 } |