Examples of org.apache.derby.iapi.store.access.TransactionController

Package org.apache.derby.iapi.store.access

Examples of org.apache.derby.iapi.store.access.TransactionController

org.apache.derby.iapi.store.access.TransactionController
The TransactionController interface provides methods that an access client can use to control a transaction, which include the methods for gaining access to resources (conglomerates, scans, etc.) in the transaction controller's storage manager. TransactionControllers are obtained from an AccessFactory via the getTransaction method.
Each transaction controller is associated with a transaction context which provides error cleanup when standard exceptions are thrown anywhere in the system. The transaction context performs the following actions in response to cleanupOnError:
- If the error is an instance of StandardException that has a severity less than ExceptionSeverity.TRANSACTION_SEVERITY all resources remain unaffected.
- If the error is an instance of StandardException that has a severity equal to ExceptionSeverity.TRANSACTION_SEVERITY, then all resources are released. An attempt to use any resource obtained from this transaction controller after such an error will result in an error. The transaction controller itself remains valid, however.
- If the error is an instance of StandardException that has a severity greater than ExceptionSeverity.TRANSACTION_SEVERITY, then all resources are released and the context is popped from the stack. Attempting to use this controller or any resources obtained from it will result in an error.
Transactions are obtained from an AccessFactory. @see AccessFactory#getTransaction @see org.apache.derby.iapi.error.StandardException @see PersistentSet


    _uuidString = (String) key;


        if ( _sequenceGenerator == null )
        {
            TransactionController executionTC = getLCC().getTransactionExecute();
            
            //
            // We lookup information in a read-only subtransaction in order to minimize
            // contention. Since this is a read-only subtransaction, there should be
            // no conflict with the parent transaction.
            //
            TransactionController subTransaction = executionTC.startNestedUserTransaction( true );
            try {
                _sequenceGenerator = createSequenceGenerator( subTransaction );
            }
            finally
            {
                subTransaction.commit();
                subTransaction.destroy();
            }
        }


    if ( _sequenceGenerator != null ) { return this; }
    else { return null; }

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   * @return Returns true if the value was successfully updated, false if we lost a race with another session.
     *
     */
    public boolean updateCurrentValueOnDisk( Long oldValue, Long newValue ) throws StandardException
    {
        TransactionController executionTransaction = getLCC().getTransactionExecute();
        TransactionController nestedTransaction = null;


        try {
            nestedTransaction = executionTransaction.startNestedUserTransaction( false );
        } catch (StandardException se) {}
        
        // First try to do the work in the nested transaction. Fail if we can't
        // get a lock immediately.
        if ( nestedTransaction != null )
        {
            try {
                return updateCurrentValueOnDisk( nestedTransaction, oldValue, newValue, false );
            }
            catch (StandardException se)
            {
                if ( !se.getMessageId().equals( SQLState.LOCK_TIMEOUT ) ) { throw se; }
            }
            finally
            {
                nestedTransaction.commit();
                nestedTransaction.destroy();
            }
        }
        
        // If we get here, we failed to do the work in the nested transaction.
        // Fall back on the execution transaction

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  }


  public LanguageConnectionContext setupConnection(ContextManager cm, String user, String drdaID, String dbname)
    throws StandardException {


    TransactionController tc = getConnectionTransaction(cm);


    cm.setLocaleFinder(this);
    pushDbContext(cm);


    // push a database shutdown context

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  protected  UUID  makeDatabaseID(boolean create, Properties startParams)
    throws StandardException
  {
    
    TransactionController tc = af.getTransaction(
        ContextService.getFactory().getCurrentContextManager());


    String  upgradeID = null;
    UUID  databaseID;


    if ((databaseID = (UUID) tc.getProperty(DataDictionary.DATABASE_ID)) == null) {


      // no property defined in the Transaction set
      // this could be an upgrade, see if it's stored in the service set


      UUIDFactory  uuidFactory  = Monitor.getMonitor().getUUIDFactory();


      
      upgradeID = startParams.getProperty(DataDictionary.DATABASE_ID);
      if (upgradeID == null )
      {
        // just create one
        databaseID = uuidFactory.createUUID();
      } else {
        databaseID = uuidFactory.recreateUUID(upgradeID);
      }


      tc.setProperty(DataDictionary.DATABASE_ID, databaseID, true);
    }


    // Remove the database identifier from the service.properties
    // file only if we upgraded it to be stored in the transactional
    // property set.
    if (upgradeID != null)
      startParams.remove(DataDictionary.DATABASE_ID);


    tc.commit();
    tc.destroy();


    return databaseID;
  }

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     * on disk outside of service.properties.
     */
  protected Properties getAllDatabaseProperties()
    throws StandardException {


    TransactionController tc = af.getTransaction(
                    ContextService.getFactory().getCurrentContextManager());
    Properties dbProps = tc.getProperties();
    tc.commit();
    tc.destroy();


    return dbProps;
  }

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     *  setted up by the system properties.
     */
    private long getDefaultXATransactionTimeout() throws XAException {
        try {
            LanguageConnectionContext lcc = con.getLanguageConnection();
            TransactionController tc = lcc.getTransactionExecute();


            long timeoutMillis = 1000 * (long) PropertyUtil.getServiceInt(
                tc,
                Property.PROP_XA_TRANSACTION_TIMEOUT,
                0,

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    }


    private void tempTablesXApostCommit() 
        throws StandardException
    {
        TransactionController tc = getTransactionExecute();


        // at commit time for an XA transaction drop all temporary tables.
        // A transaction context may not be maintained from one
        // XAResource.xa_commit to the next in the case of XA with
        // network server and thus there is no way to get at the temp
        // tables again.  To provide consistent behavior in embedded vs
        // network server, consistently remove temp tables at XA commit
        // transaction boundary.
        for (int i=0; i < allDeclaredGlobalTempTables.size(); i++)
        {
            // remove all temp tables from this context.
            TableDescriptor td = 
                ((TempTableInfo) 
                 (allDeclaredGlobalTempTables.get(i))).getTableDescriptor();


            //remove the conglomerate created for this temp table
            tc.dropConglomerate(td.getHeapConglomerateId()); 


            //remove it from the list of temp tables
            allDeclaredGlobalTempTables.remove(i); 
        }


        tc.commit();
    }

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                SanityManager.THROWASSERT("Nested transaction active!");
            }
        }


        // now commit the Store transaction
        TransactionController tc = getTransactionExecute();
        if ( tc != null && commitStore ) 
        { 
            if (sync)
            {
                if (commitflag == NON_XA)
                {
                    // regular commit
                    tc.commit();
                }
                else
                {
                    // This may be a xa_commit, check overloaded commitflag.


                    if (SanityManager.DEBUG)
                        SanityManager.ASSERT(commitflag == XA_ONE_PHASE ||
                                             commitflag == XA_TWO_PHASE,
                                               "invalid commit flag");


                    ((XATransactionController)tc).xa_commit(
                            commitflag == XA_ONE_PHASE);


                }
            }
            else
            {
                tc.commitNoSync(commitflag);
            }


            // reset the savepoints to the new
            // location, since any outer nesting
            // levels expect there to be a savepoint

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    private TableDescriptor cleanupTempTableOnCommitOrRollback(
    TableDescriptor         td, 
    boolean                 dropAndRedeclare)
         throws StandardException
    {
        TransactionController tc = getTransactionExecute();


        //create new conglomerate with same properties as the old conglomerate 
        //and same row template as the old conglomerate
        long conglomId = 
            tc.createConglomerate(
                "heap", // we're requesting a heap conglomerate
                td.getEmptyExecRow().getRowArray(), // row template
                null, //column sort order - not required for heap
                td.getColumnCollationIds(),  // same ids as old conglomerate
                null, // properties
                (TransactionController.IS_TEMPORARY | 
                 TransactionController.IS_KEPT));


        long cid = td.getHeapConglomerateId();


        //remove the old conglomerate descriptor from the table descriptor
        ConglomerateDescriptor cgd = td.getConglomerateDescriptor(cid);
        td.getConglomerateDescriptorList().dropConglomerateDescriptorByUUID(
            cgd.getUUID());


        //add the new conglomerate descriptor to the table descriptor
        cgd = getDataDictionary().getDataDescriptorGenerator().newConglomerateDescriptor(conglomId, null, false, null, false, null, td.getUUID(),
        td.getSchemaDescriptor().getUUID());
        ConglomerateDescriptorList conglomList = 
            td.getConglomerateDescriptorList();
        conglomList.add(cgd);


        //reset the heap conglomerate number in table descriptor to -1 so it 
        //will be refetched next time with the new value
        td.resetHeapConglomNumber();


        if (dropAndRedeclare)
        {
            //remove the old conglomerate from the system
            tc.dropConglomerate(cid); 


            replaceDeclaredGlobalTempTable(td.getName(), td);
        }


        return(td);

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    try
    {
      if (af != null)
      {
        TransactionController tc = null;
        try
        {
          tc = af.getAndNameTransaction(
                            context, AccessFactoryGlobals.SYS_TRANS_NAME);


          getLogFactoryProperties(tc);
        }
        finally
        {
          if (tc != null)
            tc.commit();
        }
      }


      // checkpoint will start its own internal transaction on the current
      // context.

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