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