DBCThreadedIterator (Corpus Storage System 1.6.2 API)

java.lang.Object
- de.julielab.costosys.dbconnection.DBCIterator<E>
- - de.julielab.costosys.dbconnection.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 Description

protected ConnectionClosable backgroundThread

protected Exchanger<List<E>> listExchanger

Constructor Summary

Constructors
Constructor Description

DBCThreadedIterator()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	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