edu.illinois.cs.cogcomp.wikifier.utils.concurrent

Class PrefetchIterator<K,V>

java.lang.Object

edu.illinois.cs.cogcomp.wikifier.utils.concurrent.PrefetchIterator<K,V>

Type Parameters:

K - keys

V - values to be feteched

All Implemented Interfaces:

Iterator<V>

public abstract class PrefetchIterator<K,V>
extends Object
implements Iterator<V>

Iterates keys while pre-fetching the next available values

Author:

cheng88

Constructor Summary

Constructors

Constructor and Description
PrefetchIterator(Iterator<K> keys) Upon each next() call, threadCount prefetches are being executed if possible.
PrefetchIterator(Iterator<K> keys, int threadCount) Upon each next() call, threadCount prefetches are being executed if possible.

Method Summary

Modifier and Type	Method and Description
void	close() This object closes automatically when the hasNext() returns false
abstract V	fetch(K key) Potentially expensive operation
boolean	hasNext()
V	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

Constructor Detail

PrefetchIterator

public PrefetchIterator(Iterator<K> keys)

Upon each next() call, threadCount prefetches are being executed if possible.

Parameters:

keys -

PrefetchIterator

public PrefetchIterator(Iterator<K> keys,
                        int threadCount)

Upon each next() call, threadCount prefetches are being executed if possible.

Parameters:

keys -

threadCount -

Method Detail

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<V>

next

public V next()

Specified by:

next in interface Iterator<V>

remove

public void remove()

Specified by:

remove in interface Iterator<V>

fetch

public abstract V fetch(K key)

Potentially expensive operation

Parameters:

key -

Returns:

value fetched

close

public void close()

This object closes automatically when the hasNext() returns false