Examples of org.apache.derby.iapi.store.access.conglomerate.Conglomerate

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

Examples of org.apache.derby.iapi.store.access.conglomerate.Conglomerate

org.apache.derby.iapi.store.access.conglomerate.Conglomerate
A conglomerate is an abstract storage structure (they correspond to access methods). The Conglomerate interface corresponds to a single instance of a conglomerate. In other words, for each conglomerate in the system, there will be one object implementing Conglomerate.
The Conglomerate interface is implemented by each access method. The implementation must maintain enough information to properly open the conglomerate and scans, and to drop the conglomerate. This information typically will include the id of the container or containers in which the conglomerate is stored, and my also include property information.
Conglomerates are created by a conglomerate factory. The access manager stores them in a directory (which is why they implement Storable).

    public Conglomerate readConglomerate(
    TransactionManager  xact_manager,
    ContainerKey        container_key)
    throws StandardException
    {
        Conglomerate    btree      = null;
        ContainerHandle container  = null;
        ControlRow      root       = null;


        try
        {

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    }


  private Conglomerate findExistingConglomerate(long conglomId)
    throws StandardException
  {
    Conglomerate conglom = null;


    if (conglomId < 0)
    {
      if (tempCongloms != null)
        conglom = (Conglomerate) tempCongloms.get(new Long(conglomId));

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  }


  private Conglomerate findConglomerate(long conglomId)
    throws StandardException
  {
    Conglomerate conglom = null;


    if (conglomId >= 0)
        {
            conglom = accessmanager.conglomCacheFind(this, conglomId);
        }

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    int         collation_id)
    throws StandardException
    {
        boolean is_temporary = (conglomId < 0);


    Conglomerate conglom = findConglomerate(conglomId);
    if (conglom == null)
        {
      throw StandardException.newException(
                SQLState.AM_NO_SUCH_CONGLOMERATE_DROP, new Long(conglomId));
        }


        // Get exclusive lock on the table being altered.
    ConglomerateController cc =
            conglom.open(
                this, rawtran, false, OPENMODE_FORUPDATE,
                MODE_TABLE,
                accessmanager.table_level_policy[
                    TransactionController.ISOLATION_SERIALIZABLE],
                (StaticCompiledOpenConglomInfo) null,
                (DynamicCompiledOpenConglomInfo) null);


    conglom.addColumn(this, column_id, template_column, collation_id);


        // remove the old entry in the Conglomerate directory, and add the
        // new one.
    if (is_temporary)
    {

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                accessmanager.getNextConglomId(
                    cfactory.getConglomerateFactoryId());
        }


        // call the factory to actually create the conglomerate.
        Conglomerate conglom =
            cfactory.createConglomerate(
                this, segment, conglomid, template, 
                columnOrder, collationIds, properties, temporaryFlag);


    long conglomId;
    if ((temporaryFlag & TransactionController.IS_TEMPORARY)
        == TransactionController.IS_TEMPORARY)
    {
      conglomId = nextTempConglomId--;
      if (tempCongloms == null)
        tempCongloms = new HashMap();
      tempCongloms.put(new Long(conglomId), conglom);
    }
    else
    {
      conglomId = conglom.getContainerid();


            accessmanager.conglomCacheAddEntry(conglomId, conglom);
    }


    return conglomId;

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      {
                for (Iterator it = tempCongloms.keySet().iterator();
                     it.hasNext(); )
                {
          Long conglomId = (Long) it.next();
          Conglomerate c = (Conglomerate) tempCongloms.get(conglomId);
          str += "temp conglomerate id = " + conglomId + ": " + c;
        }
      }


        }

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    }


    public boolean conglomerateExists(long conglomId)
    throws StandardException
  {
    Conglomerate conglom = findConglomerate(conglomId);
    if (conglom == null)
      return false;
    return true;
  }

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  }


    public void dropConglomerate(long conglomId)
    throws StandardException
  {
    Conglomerate conglom = findExistingConglomerate(conglomId);


    conglom.drop(this);


    if (conglomId < 0)
    {
      if (tempCongloms != null)
        tempCongloms.remove(new Long(conglomId));

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    FormatableBitSet                 scanColumnList,
    DataValueDescriptor[]   fetchRow)
        throws StandardException
    {
    // Find the conglomerate.
    Conglomerate conglom = findExistingConglomerate(conglomId);


    // Get a scan controller.
        return(
            conglom.fetchMaxOnBTree(
                this, 
                rawtran,
                conglomId,
                open_mode,
                lock_level,

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    boolean                 createConglom,
    RowLocationRetRowSource rowSource)
    throws StandardException
  {
    // Find the conglomerate.
    Conglomerate conglom = findExistingConglomerate(conglomId);


    // Load up the conglomerate with rows from the rowSource.
    // Don't need to keep track of the conglomerate controller because load
    // automatically closes it when it finished.
    return(conglom.load(this, createConglom, rowSource));
  }

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Related Classes of org.apache.derby.iapi.store.access.conglomerate.Conglomerate

org.apache.derby.impl.store.access.btree.index.B2IFactory

org.apache.derby.impl.store.access.RAMAccessManager

org.apache.derby.impl.store.access.RAMTransaction

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