org.openspaces.persistency.hibernate.iterator

Class AbstractScrollableDataIterator

java.lang.Object

org.openspaces.persistency.hibernate.iterator.AbstractScrollableDataIterator

All Implemented Interfaces:

DataIterator, Iterator

Direct Known Subclasses:

DefaultScrollableDataIterator, StatelessScrollableDataIterator

public abstract class AbstractScrollableDataIterator
extends Object
implements DataIterator

A base class for scrollable result set (ScrollableResults created based on either an entity name or a SQLQuery. Also allows for a "from" and "size" to be provided, in this case, it will iterate from the given index till "size" results.

Author:

kimchy

Field Summary

Fields

Modifier and Type	Field and Description
protected String	entityName
protected int	fetchSize
protected int	from
protected String	hQuery
protected boolean	perfromOrderById
protected org.hibernate.SessionFactory	sessionFactory
protected int	size
protected SQLQuery	sqlQuery

Constructor Summary

Constructors

Constructor and Description
AbstractScrollableDataIterator(SQLQuery sqlQuery, org.hibernate.SessionFactory sessionFactory, int fetchSize, boolean performOrderById) Constructs a scrollable iterator over the given GigaSpaces SQLQuery.
AbstractScrollableDataIterator(SQLQuery sqlQuery, org.hibernate.SessionFactory sessionFactory, int fetchSize, boolean performOrderById, int from, int size) Constructs a scrollable iterator over the given GigaSpaces SQLQuery.
AbstractScrollableDataIterator(String hQuery, org.hibernate.SessionFactory sessionFactory, int fetchSize) Constructs a scrollable iterator over the given hibernate query string.
AbstractScrollableDataIterator(String entityName, org.hibernate.SessionFactory sessionFactory, int fetchSize, boolean performOrderById) Constructs a scrollable iterator over the given entity name.
AbstractScrollableDataIterator(String entityName, org.hibernate.SessionFactory sessionFactory, int fetchSize, boolean performOrderById, int from, int size) Constructs a scrollable iterator over the given entity name.
AbstractScrollableDataIterator(String hQuery, org.hibernate.SessionFactory sessionFactory, int fetchSize, int from, int size) Constructs a scrollable iterator over the given hibernate query string.

Method Summary

Modifier and Type	Method and Description
protected abstract void	clear()
void	close() Clean up after any resources associated with this iterator The iterator can be closed even if the iterator wasn't iterated over all of its elements.
protected abstract org.hibernate.ScrollableResults	createCursor()
protected abstract void	doClose()
boolean	hasNext()
Object	next()
void	remove()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Iterator

forEachRemaining

Field Detail

entityName

protected final String entityName

sqlQuery

protected final SQLQuery sqlQuery

hQuery

protected final String hQuery

sessionFactory

protected final org.hibernate.SessionFactory sessionFactory

perfromOrderById

protected final boolean perfromOrderById

fetchSize

protected final int fetchSize

from

protected final int from

size

protected final int size

Constructor Detail

AbstractScrollableDataIterator

public AbstractScrollableDataIterator(String entityName,
                                      org.hibernate.SessionFactory sessionFactory,
                                      int fetchSize,
                                      boolean performOrderById)

Constructs a scrollable iterator over the given entity name.

Parameters:

entityName - The entity name to scroll over

sessionFactory - The session factory to use to construct the session

fetchSize - The fetch size of the scrollabale result set

performOrderById - Should the query perform order by id or not

AbstractScrollableDataIterator

public AbstractScrollableDataIterator(String entityName,
                                      org.hibernate.SessionFactory sessionFactory,
                                      int fetchSize,
                                      boolean performOrderById,
                                      int from,
                                      int size)

Constructs a scrollable iterator over the given entity name.

Parameters:

entityName - The entity name to scroll over

sessionFactory - The session factory to use to constrcut the session

fetchSize - The fetch size of the scrollable result set

performOrderById - Should the query perform order by id or not

from - The from index to scroll from

size - The size of data to scroll to

AbstractScrollableDataIterator

public AbstractScrollableDataIterator(String hQuery,
                                      org.hibernate.SessionFactory sessionFactory,
                                      int fetchSize)

Constructs a scrollable iterator over the given hibernate query string.

Parameters:

hQuery - The hiberante query string to scroll over

sessionFactory - The session factory to use to construct the session

fetchSize - The fetch size of the scrollable result set

AbstractScrollableDataIterator

public AbstractScrollableDataIterator(String hQuery,
                                      org.hibernate.SessionFactory sessionFactory,
                                      int fetchSize,
                                      int from,
                                      int size)

Constructs a scrollable iterator over the given hibernate query string.

Parameters:

hQuery - The hiberante query string to scroll over

sessionFactory - The session factory to use to construct the session

fetchSize - The fetch size of the scrollable result set

from - The from index to scroll from

size - The size of data to scroll to

AbstractScrollableDataIterator

public AbstractScrollableDataIterator(SQLQuery sqlQuery,
                                      org.hibernate.SessionFactory sessionFactory,
                                      int fetchSize,
                                      boolean performOrderById)

Constructs a scrollable iterator over the given GigaSpaces SQLQuery.

Parameters:

sqlQuery - The SQLQuery to scroll over

sessionFactory - The session factory to use to construct the session

fetchSize - The fetch size of the scrollabale result set

performOrderById - Should the query perform order by id or not

AbstractScrollableDataIterator

public AbstractScrollableDataIterator(SQLQuery sqlQuery,
                                      org.hibernate.SessionFactory sessionFactory,
                                      int fetchSize,
                                      boolean performOrderById,
                                      int from,
                                      int size)

Constructs a scrollable iterator over the given GigaSpaces SQLQuery.

Parameters:

sqlQuery - The SQLQuery to scroll over

sessionFactory - The session factory to use to construct the session

fetchSize - The fetch size of the scrollable result set

performOrderById - Should the query perform order by id or not

from - The from index to scroll from

size - The size of data to scroll to

Method Detail

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator

next

public Object next()

Specified by:

next in interface Iterator

remove

public void remove()

Specified by:

remove in interface Iterator

close

public void close()

Description copied from interface: DataIterator

Clean up after any resources associated with this iterator The iterator can be closed even if the iterator wasn't iterated over all of its elements.

Specified by:

close in interface DataIterator

doClose

protected abstract void doClose()

clear

protected abstract void clear()

createCursor

protected abstract org.hibernate.ScrollableResults createCursor()