de.julielab.xmlData.dataBase

Class DBCThreadedIterator<E>

java.lang.Object

de.julielab.xmlData.dataBase.DBCIterator<E>

de.julielab.xmlData.dataBase.DBCThreadedIterator<E>

Type Parameters:

E -

All Implemented Interfaces:

Iterator<E>

Direct Known Subclasses:

ThreadedColumnsIterator, ThreadedColumnsToRetrieveIterator

public abstract class DBCThreadedIterator<E>
extends DBCIterator<E>

This iterator class employs multiple Threads for database queries. While the iterator offers access to retrieved values, additional values are concurrently retrieved from the database by another thread.

The iterator uses the Exchanger class to communicate between threads.

Author:

hellrich/faessler

Field Summary

Fields

Modifier and Type	Field and Description
protected ConnectionClosable	backgroundThread
protected Exchanger<List<E>>	listExchanger

Constructor Summary

Constructors

Constructor and Description
DBCThreadedIterator()

Method Summary

Modifier and Type	Method and Description
abstract void	close() Frees resources occupied by this iterator (e.g.
boolean	hasNext()
abstract void	join()
E	next()
void	remove() unsupported
protected void	update()

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

listExchanger

protected Exchanger<List<E>> listExchanger

backgroundThread

protected ConnectionClosable backgroundThread

Constructor Detail

DBCThreadedIterator

public DBCThreadedIterator()

Method Detail

hasNext

public boolean hasNext()

next

public E next()

remove

public void remove()

unsupported

update

protected void update()

close

public abstract void close()

Description copied from class: DBCIterator

Frees resources occupied by this iterator (e.g. database connections).

Specified by:

close in class DBCIterator<E>

join

public abstract void join()
                   throws InterruptedException

Throws:

InterruptedException