com.amazon.carbonado.cursor

Class FetchAheadCursor<S>

java.lang.Object

com.amazon.carbonado.cursor.AbstractCursor<S>

com.amazon.carbonado.cursor.FetchAheadCursor<S>

All Implemented Interfaces:

Cursor<S>

public class FetchAheadCursor<S>
extends AbstractCursor<S>

Cursor implementation which fetches records in advance, in order to release locks.

Author:

Brian S O'Neill

Constructor Summary

Constructors

Constructor and Description
FetchAheadCursor(Cursor<S> source, int fetchAhead)

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Call close to release any resources being held by this cursor.
boolean	hasNext() Returns true if this cursor has more elements.
S	next() Returns the next element from this cursor.

Methods inherited from class com.amazon.carbonado.cursor.AbstractCursor

copyInto, copyInto, skipNext, toList, toList

Methods inherited from class java.lang.Object

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

Constructor Detail

FetchAheadCursor

public FetchAheadCursor(Cursor<S> source,
                int fetchAhead)

Parameters:

fetchAhead - how much to fetch ahead from source

Method Detail

close

public void close()
           throws FetchException

Description copied from interface: Cursor

Call close to release any resources being held by this cursor. Further operations on this cursor will behave as if there are no results.

Throws:

FetchException

hasNext

public boolean hasNext()
                throws FetchException

Description copied from interface: Cursor

Returns true if this cursor has more elements. In other words, returns true if next would return an element rather than throwing an exception.

Throws:

FetchException - if storage layer throws an exception

next

public S next()
       throws FetchException

Description copied from interface: Cursor

Returns the next element from this cursor. This method may be called repeatedly to iterate through the results.

Throws:

FetchException - if storage layer throws an exception