Examples of org.apache.derby.iapi.sql.Activation

org.apache.derby.iapi.sql.Activation
An activation contains all the local state information necessary to execute a re-entrant PreparedStatement. The way it will actually work is that a PreparedStatement will have an executable plan, which will be a generated class. All of the local state will be variables in the class. Creating a new instance of the executable plan will create the local state variables. This means that an executable plan must implement this interface, and that the PreparedStatement.getActivation() method will do a "new" operation on the executable plan.
The fixed implementations of Activation in the Execution impl package are used as skeletons for the classes generated for statements when they are compiled.
There are no fixed implementations of Activation for statements; a statement has an activation generated for it when it is compiled.


    // try to remember the SQL statement in case anybody asks for it
    SQLText = sql;    


    try {
      Activation activation;
      try {
        PreparedStatement preparedStatement = lcc.prepareInternalStatement
            (lcc.getDefaultSchema(), sql, resultSetConcurrency==
                        java.sql.ResultSet.CONCUR_READ_ONLY, false);
        activation =
          preparedStatement.getActivation(lcc, resultSetType ==
                        java.sql.ResultSet.TYPE_SCROLL_INSENSITIVE);
        checkRequiresCallableStatement(activation);
                InterruptStatus.restoreIntrFlagIfSeen(lcc);
       } catch (Throwable t) {
        throw handleException(t);
       }




      // this is for a Statement execution
      activation.setSingleExecution();


      //bug 4838 - save the auto-generated key information in activation. keeping this
      //information in lcc will not work work it can be tampered by a nested trasaction
      if (autoGeneratedKeys == Statement.RETURN_GENERATED_KEYS)
        activation.setAutoGeneratedKeysResultsetInfo(columnIndexes, columnNames);
      return executeStatement(activation, executeQuery, executeUpdate);
    } finally {
        restoreContextStack();
    }
    }

View Full Code Here

   */
  public Activation getActivation(LanguageConnectionContext lcc,
                  boolean scrollable)
    throws StandardException
  {
    Activation ac;
    synchronized (this) {
      GeneratedClass gc = getActivationClass();


      if (gc == null) {
        rePrepare(lcc);
        gc = getActivationClass();
      }


      ac = new GenericActivationHolder(lcc, gc, this, scrollable);


      inUseCount++;
    }
    // DERBY-2689. Close unused activations-- this method should be called
    // when I'm not holding a lock on a prepared statement to avoid
    // deadlock.
    lcc.closeUnusedActivations();


    Activation parentAct = null;
    StatementContext stmctx = lcc.getStatementContext();


    if (stmctx != null) {
      // If not null, parentAct represents one of 1) the activation of a
      // calling statement and this activation corresponds to a statement

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    public ResultSet executeSubStatement(LanguageConnectionContext lcc,
                     boolean rollbackParentContext,
                     long timeoutMillis)
    throws StandardException
  {
    Activation parent = lcc.getLastActivation();
    Activation a = getActivation(lcc, false);
    a.setSingleExecution();
    lcc.setupSubStatementSessionContext(parent);
    return executeStmt(a, rollbackParentContext, timeoutMillis);
  }

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        // closing one or more activation leaving our index beyond
        // the end of the array
        if (i >= acts.size())
          continue;


        Activation a1 = (Activation) acts.elementAt(i);
        if (!a1.isInUse()) {
          a1.close();
        }
      }
    }


    if (SanityManager.DEBUG) {

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    int size = acts.size();
    if (size > 0)
    {
      for (int i = 0; i < size; i++) {
         Activation a = (Activation) acts.elementAt(i);


         if (!a.isInUse())
         {
          continue;
         }






        String executingCursorName = a.getCursorName();


         if (cursorName.equals(executingCursorName)) {


          ResultSet rs = a.getResultSet();
          if (rs == null)
            continue;


           // if the result set is closed, the the cursor doesn't exist
           if (rs.isClosed()) {

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   */
  private boolean checkIfAnyActivationHasHoldCursor(String tableName)
      throws StandardException
  {
    for (int i = acts.size() - 1; i >= 0; i--) {
      Activation a = (Activation) acts.elementAt(i);
      if (a.checkIfThisActivationHasHoldCursor(tableName))
        return true;
    }
    return false;
  }

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    boolean seenOpenResultSets = false;


    /* For every activation */
    for (int i = acts.size() - 1; i >= 0; i--) {


      Activation a = (Activation) acts.elementAt(i);


      if (SanityManager.DEBUG)
      {
        SanityManager.ASSERT(a instanceof CursorActivation, "a is not a CursorActivation");
      }


      if (!a.isInUse())
      {
        continue;
      }


      if (!a.getResultSetHoldability())
      {
        continue;
      }


      ResultSet rs = ((CursorActivation) a).getResultSet();


      /* is there an open result set? */
      if ((rs != null) && !rs.isClosed() && rs.returnsRows())
      {
        seenOpenResultSets = true;
        break;
      }
    }


    if (!seenOpenResultSets)
      return(true);


    // There may be open ResultSet's that are yet to be garbage collected
    // let's try and force these out rather than throw an error
    System.gc();
    System.runFinalization();




    /* For every activation */
    for (int i = acts.size() - 1; i >= 0; i--) {
        
      Activation a = (Activation) acts.elementAt(i);


      if (SanityManager.DEBUG)
      {
        SanityManager.ASSERT(a instanceof CursorActivation, "a is not a CursorActivation");
      }


      if (!a.isInUse())
      {
        continue;
      }


      if (!a.getResultSetHoldability())
      {
        continue;
      }


      ResultSet rs = ((CursorActivation) a).getResultSet();

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    // synchronize on acts as other threads may be closing activations
    // in this list, thus invalidating the Enumeration
    for (int i = acts.size() - 1; i >= 0; i--) {
        
      Activation a = (Activation) acts.elementAt(i);


      if (!a.isInUse())
      {
        continue;
      }
      
      /* for this prepared statement */
      if (pStmt == a.getPreparedStatement()) {
        ResultSet rs = a.getResultSet();


        /* is there an open result set? */
        if (rs != null && ! rs.isClosed())
        {
          if (!rs.returnsRows())
            continue;
          seenOpenResultSets = true;
          break;
        }
        
      }
    }


    if (!seenOpenResultSets)
      return false;


    // There may be open ResultSet's that are yet to be garbage collected
    // let's try and force these out rather than throw an error
    System.gc();
    System.runFinalization();




    /* For every activation */
    // synchronize on acts as other threads may be closing activations
    // in this list, thus invalidating the Enumeration
    for (int i = acts.size() - 1; i >= 0; i--) {
        
      Activation a = (Activation) acts.elementAt(i);


      if (!a.isInUse())
      {
        continue;
      }


      /* for this prepared statement */
      if (pStmt == a.getPreparedStatement()) {
        ResultSet rs = a.getResultSet();


        /* is there an open result set? */
        if (rs != null && ! rs.isClosed())
        {
          if ((provider != null) && rs.returnsRows()) {

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        // it maybe the case that a reset()/close() ends up closing
        // one or more activation leaving our index beyond
        // the end of the array
        if (i >= acts.size())
          continue;
        Activation a = (Activation) acts.elementAt(i);
        a.reset();
        a.close();
      }
                       
      popMe();
    }

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      // one or more activation leaving our index beyond
      // the end of the array
      if (i >= acts.size())
        continue;


      Activation a = (Activation) acts.elementAt(i);
      /*
      ** andClose true means we are here for rollback.
      ** In case of rollback, we don't care for holding
      ** cursors and that's why I am resetting holdability
      ** to false for all activations just before rollback
      */  
      if (andClose)
        a.setResultSetHoldability(false);


      /*
      ** Look for stale activations.  Activations are
      ** marked as unused during statement finalization.
      ** Here, we sweep and remove this inactive ones.
      */  
      if (!a.isInUse())
      {
        a.close();
        continue;
      }


      a.reset();


      // Only invalidate statements if we performed DDL.
      if (andClose && dataDictionaryInWriteMode()) {
        ExecPreparedStatement ps = a.getPreparedStatement();
        if (ps != null) {
          ps.makeInvalid(DependencyManager.ROLLBACK, this);
        }
      }
    }

View Full Code Here

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