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1 package alice.jungle.persistence;
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2
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3 import java.util.Iterator;
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4
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5 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.core.Node;
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6 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.persistent.ChangeListWriter;
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7 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.persistent.Result;
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8 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.ChangeSet;
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9 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.TreeNode;
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10 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.logger.TreeOperationLog;
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11 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.transaction.AtomicReservableReference;
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12 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.transaction.DefaultTreeContext;
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13 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.transaction.TransactionManager;
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14 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.transaction.TreeContext;
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15 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.transaction.AtomicReservableReference.Reservation;
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16 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.DefaultEither;
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17 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.DefaultError;
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18 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.Either;
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19 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.Error;
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20
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21 public class PersistentTransactionManager<T extends TreeNode<T>> implements TransactionManager<T> {
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22 private final AtomicReservableReference<TreeContext<T>> repository;
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23 private final TreeContext<T> tip;
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24 private final ChangeListWriter writer;
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25 private final String uuid;
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26 private final String treeName;
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27
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28 public PersistentTransactionManager(String _treeName, ChangeListWriter _writer,TreeContext<T> _tip,
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29 AtomicReservableReference<TreeContext<T>> _repository,String _uuid)
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30 {
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31 repository = _repository;
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32 tip = _tip;
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33 writer = _writer;
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34 uuid = _uuid;
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35 treeName = _treeName;
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36 }
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37
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38 @Override
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39 public Either<Error, TransactionManager<T>> commit(T _newRoot,final TreeOperationLog _log) {
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40 ChangeSet cs = tip.getChangeSet();
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41 long currentRevision = cs.revision();
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42 long nextRevision = currentRevision + 1;
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43
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44 PersistentChangeList list = new PersistentChangeList(uuid, treeName, _log);
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45 Node root = _newRoot.getAsNode();
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46 PersistentChangeSet newCs = new PersistentChangeSet(root, cs, list, uuid, treeName, nextRevision);
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47 DefaultTreeContext<T> newContext = new DefaultTreeContext<T>(_newRoot,newCs);
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48
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49 @SuppressWarnings("rawtypes")
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50 Reservation reservation = repository.makeReservation(tip, newContext);
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51 if(reservation == null) {
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52 return DefaultEither.newA((Error)new DefaultError());
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53 }
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54 Result r = writer.write(list);
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55 if(r != Result.SUCCESS) {
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56 return DefaultEither.newA((Error)new DefaultError());
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57 }
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58 reservation.confirm();
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59 TransactionManager<T> txManager = new PersistentTransactionManager<T>(treeName, writer, newContext, repository, uuid);
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60 return DefaultEither.newB(txManager);
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61 }
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62
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63 @Override
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64 public long getRevision()
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65 {
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66 ChangeSet cs = tip.getChangeSet();
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67 return cs.revision();
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68 }
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69
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70 @Override
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71 public String getUUID() {
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72 return uuid;
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73 }
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74
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76
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77 }
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