Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/arc/Lru.java @ 32:243c74d599bf

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author Dan Creswell <dan.creswell@gmail.com>
date Sat, 12 Jun 2010 10:41:47 +0100
parents 3dc0c5604566
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 }