Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/arc/Lru.java @ 28:4b2f23b6feca
Add a schema compatibility check to indexer that parallels storage.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:11:15 +0100 |
parents | 3dc0c5604566 |
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0
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1 package org.dancres.blitz.arc; |
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2 |
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3 import java.io.IOException; |
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4 |
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5 import java.util.logging.*; |
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6 |
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7 import org.dancres.struct.LinkedInstances; |
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8 |
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9 class Lru { |
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10 static final int T1 = 0; |
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11 static final int T2 = 1; |
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12 static final int B1 = 2; |
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13 static final int B2 = 3; |
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14 |
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15 private static final String[] NAMES = {"T1", "T2", "B1", "B2"}; |
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16 |
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17 private LinkedInstances theEntries = new LinkedInstances(); |
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18 |
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19 private int theId; |
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20 |
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21 Lru(int anId) { |
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22 theId = anId; |
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23 } |
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24 |
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25 synchronized void remove(CacheBlockDescriptor aDesc) { |
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26 if (aDesc.getWhere() != theId) |
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27 throw new RuntimeException("I don't own this descriptor"); |
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28 |
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29 theEntries.remove(aDesc); |
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30 } |
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31 |
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32 synchronized void mruInsert(CacheBlockDescriptor aDesc) { |
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33 theEntries.insert(aDesc); |
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34 aDesc.setWhere(theId); |
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35 } |
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36 |
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37 synchronized void lruInsert(CacheBlockDescriptor aDesc) { |
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38 theEntries.add(aDesc); |
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39 aDesc.setWhere(theId); |
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40 } |
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41 |
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42 synchronized CacheBlockDescriptor lruRemove() { |
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43 return (CacheBlockDescriptor) theEntries.removeLast(); |
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44 } |
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45 |
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46 synchronized int length() { |
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47 return theEntries.getSize(); |
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48 } |
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49 |
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50 synchronized void dump() { |
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51 Logger myLogger = ArcCache.theLogger; |
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52 |
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53 myLogger.log(Level.FINE, "AC: " + NAMES[theId]); |
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54 |
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55 CacheBlockDescriptor myCBD = |
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56 (CacheBlockDescriptor) theEntries.getHead(); |
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57 |
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58 while (myCBD != null) { |
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59 |
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60 try { |
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61 myCBD.acquire(); |
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62 |
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63 myLogger.log(Level.FINE, myCBD.getId() + ", " + |
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64 myCBD.getId().hashCode() + ", "); |
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65 |
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66 myCBD.release(); |
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67 } catch (InterruptedException anIE) { |
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68 myLogger.log(Level.FINE, "Interrupted locking CBD"); |
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69 } |
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70 |
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71 myCBD = (CacheBlockDescriptor) myCBD.getNext(); |
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72 } |
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73 } |
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74 |
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75 synchronized void sync(BackingStore aStore) throws IOException { |
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76 CacheBlockDescriptor myCBD = |
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77 (CacheBlockDescriptor) theEntries.getHead(); |
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78 |
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79 while (myCBD != null) { |
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80 |
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81 try { |
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82 myCBD.acquire(); |
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83 |
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84 aStore.save(myCBD.getContent()); |
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85 |
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86 myCBD.release(); |
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87 } catch (InterruptedException anIE) { |
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88 throw new IOException(); |
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89 } |
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90 |
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91 myCBD = (CacheBlockDescriptor) myCBD.getNext(); |
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92 } |
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93 } |
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94 } |