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42
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1 package treecms.proto.simple;
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2
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3 import java.util.UUID;
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4 import java.util.concurrent.atomic.AtomicLong;
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5
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6 import treecms.proto.api.NodeID;
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7 import treecms.proto.id.DecrementalNodeID;
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8
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9 public class SimpleDecNodeID extends DecrementalNodeID
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10 {
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11 private String m_uuid;
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12 private AtomicLong m_tip;
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13 private long m_version;
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14
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15 public SimpleDecNodeID()
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16 {
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17 m_uuid = UUID.randomUUID().toString();
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18 m_tip = new AtomicLong();
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45
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19 m_tip.set(START_VALUE);
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42
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20
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21 m_version = START_VALUE;
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22 }
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23
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24 private SimpleDecNodeID(String _uuid,AtomicLong _tip,boolean _doUpdate)
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25 {
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26 m_uuid = _uuid;
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27 m_tip = _tip;
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28
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29 if(_doUpdate){
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47
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30 m_version = m_tip.decrementAndGet();
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31 return;
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32 }
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33
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34 m_version = m_tip.get();
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35 }
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36
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37 @Override
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38 public NodeID create()
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39 {
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40 return new SimpleDecNodeID();
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41 }
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42
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43 @Override
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44 public NodeID getTip()
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45 {
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46 return new SimpleDecNodeID(m_uuid,m_tip,false);
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47 }
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48
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49 @Override
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50 public String getUUID()
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51 {
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52 return m_uuid;
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53 }
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54
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55 @Override
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56 public String getVersion()
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57 {
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58 return Long.toString(m_version);
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59 }
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60
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61 @Override
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62 public NodeID update()
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63 {
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47
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64 return new SimpleDecNodeID(m_uuid,m_tip,true);
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42
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65 }
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66 }
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