Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/oid/UIDImpl.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.oid;
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2
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3 import java.io.Serializable;
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4
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5 import org.dancres.util.BytePacker;
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6
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7 /**
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8 A unique identifier which can be generated by an Allocator.
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9 */
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10 final class UIDImpl implements OID {
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11 static final int KEY_SIZE = 12;
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12
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13 private transient byte[] theKey;
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14
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15 private long theId;
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16 private int theZoneId;
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17
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18 UIDImpl(byte[] aKey) {
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19 theKey = aKey;
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20
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21 BytePacker myPacker = BytePacker.getMSBPacker(theKey);
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22 theZoneId = myPacker.getInt(0);
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23 theId = myPacker.getLong(4);
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24 }
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25
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26 UIDImpl(int aZoneId, long anId) {
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27 theId = anId;
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28 theZoneId = aZoneId;
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29 }
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30
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31 public int getZoneId() {
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32 return theZoneId;
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33 }
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34
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35 public long getId() {
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36 return theId;
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37 }
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38
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39 synchronized byte[] getKey() {
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40 if (theKey == null) {
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41 theKey = keyFor(theZoneId, theId);
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42 }
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43
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44 return theKey;
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45 }
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46
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47 public String toString() {
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48 return " " + theZoneId + "->" + theId;
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49 }
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50
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51 public int hashCode() {
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52 /*
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53 We include theZoneId to allow for the fact that all allocators for
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54 a given Entry type will be allocating id's close to each other
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55 because of the random allocator selection used when an id is
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56 generated. Because the id's are allocated evenly, there's a high
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57 chance of two UID's allocated close together in time colliding unless
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58 we also factor in theZoneId.
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59 */
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60 return theZoneId ^ ((int) (theId ^ (theId >>> 32)));
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61 }
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62
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63 public int compareTo(Object anObject) {
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64 UIDImpl myOther = (UIDImpl) anObject;
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65
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66 if (theZoneId < myOther.theZoneId)
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67 return -1;
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68 else if (theZoneId > myOther.theZoneId)
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69 return 1;
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70
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71 if (theId < myOther.theId)
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72 return -1;
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73 else if (theId > myOther.theId)
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74 return 1;
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75 else
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76 return 0;
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77 }
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78
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79 public boolean equals(Object anObject) {
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80 if (anObject instanceof UIDImpl) {
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81 UIDImpl myOther = (UIDImpl) anObject;
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82
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83 return ((theZoneId == myOther.theZoneId) &&
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84 (theId == myOther.theId));
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85 }
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86
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87 return false;
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88 }
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89
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90 private byte[] keyFor(int aZoneId, long anId) {
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91 byte[] myKey = new byte[12];
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92
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93 BytePacker myPacker = BytePacker.getMSBPacker(myKey);
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94 myPacker.putInt(aZoneId, 0);
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95 myPacker.putLong(anId, 4);
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96
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97 return myKey;
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98 }
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99 }