Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/arc/CacheBlockDescriptor.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
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1 package org.dancres.blitz.arc;
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2
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3 import java.util.logging.Level;
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4
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5 import java.io.Serializable;
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6
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7 import EDU.oswego.cs.dl.util.concurrent.Mutex;
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8
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9 import org.dancres.struct.LinkedInstance;
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10
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11 import org.dancres.blitz.cache.Identifiable;
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12 import org.dancres.blitz.cache.Identifier;
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13 import org.dancres.blitz.cache.CacheListenerSet;
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14
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15 /**
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16 Each object currently in cache is referenced via a CacbeBlockDescriptor
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17 */
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18 public class CacheBlockDescriptor implements LinkedInstance {
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19 private Identifier theIdentifier;
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20 private Identifiable theContent;
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21
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22 private LinkedInstance thePrev;
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23 private LinkedInstance theNext;
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24
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25 private int isWhere;
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26
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27 private Mutex theLock = new Mutex();
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28
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29 CacheBlockDescriptor() {
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30 }
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31
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32 void acquire() throws InterruptedException {
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33 theLock.acquire();
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34 }
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35
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36 public void release() {
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37 theLock.release();
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38 }
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39
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40 public void setId(Identifier anIdentifier) {
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41 theIdentifier = anIdentifier;
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42 }
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43
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44 public Identifier getId() {
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45 return theIdentifier;
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46 }
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47
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48 public Identifiable getContent() {
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49 return theContent;
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50 }
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51
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52 void setContent(Identifiable aContent) {
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53 theContent = aContent;
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54 }
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55
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56 public void setNext(LinkedInstance aLinkedInstance) {
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57 theNext = aLinkedInstance;
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58 }
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59
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60 public LinkedInstance getNext() {
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61 return theNext;
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62 }
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63
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64 public void setPrev(LinkedInstance aLinkedInstance) {
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65 thePrev = aLinkedInstance;
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66 }
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67
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68 public LinkedInstance getPrev() {
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69 return thePrev;
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70 }
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71
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72 boolean isEmpty() {
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73 return (theContent == null);
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74 }
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75
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76 /**
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77 Marks the CBD as being on a particular list, T1, T2, B1 or B2.
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78
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79 @see org.dancres.blitz.arc.Lru
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80 */
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81 void setWhere(int aWhere) {
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82 isWhere = aWhere;
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83 }
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84
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85 /**
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86 Returns an indication of which list this CBD is on, T1, T2, B1 or B2.
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87
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88 @see org.dancres.blitz.arc.Lru
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89 */
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90 int getWhere() {
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91 return isWhere;
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92 }
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93 }