Class BufferWithPages<A>

java.lang.Object

org.aksw.commons.io.buffer.plain.BufferWithPages<A>

Type Parameters:

T -

All Implemented Interfaces:

ArrayReadable<A>, ArrayWritable<A>, BufferLike<A>, HasArrayOps<A>, Buffer<A>, ReadableChannelFactory<A>, ReadableChannelSource<A>, SeekableReadableChannelSource<A>

public class BufferWithPages<A>
extends Object
implements Buffer<A>

A buffer backed by a mapping of page indices (longs) to arrays. All arrays are the same size. The purpose of this class is to provide a tradeoff between for frequent consecutive small inserts at sparse locations. The map accounts for sparseness, whereas consecutive small inserts will usually update the same array.

Author:

raven

Field Summary

Fields

Modifier and Type	Field	Description
protected ArrayOps<A>	arrayOps
protected long	capacity
protected Map<Long,A>	map
protected int	pageSize

Constructor Summary

Constructors

Constructor	Description
BufferWithPages(ArrayOps<A> arrayOps, int pageSize)
BufferWithPages(ArrayOps<A> arrayOps, int pageSize, long capacity, Map<Long,A> map)

Method Summary

Modifier and Type	Method	Description
static <A> BufferWithPages<A>	create(ArrayOps<A> arrayOps, int pageSize)
Object	get(long index)
ArrayOps<A>	getArrayOps()
long	getCapacity()	Buffers with 'unlimited' capacity should return Long.MAX_VALUE
Map<Long,A>	getPageMap()
void	put(long index, Object item)
int	readInto(Object tgt, int tgtOffset, long srcOffset, int length)
void	write(long offsetInBuffer, A arrayWithItemsOfTypeT, int arrOffset, int arrLength)	The method that needs to be implemented; all other methods default-delegate to this one.

Methods inherited from class Object

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

Methods inherited from interface ArrayReadable

newReadableChannel, readIntoRaw, size

Methods inherited from interface ArrayWritable

write, write

Methods inherited from interface Buffer

asList, slice

Methods inherited from interface SeekableReadableChannelSource

newReadableChannel, newReadableChannel, newReadableChannel

Field Details

arrayOps

protected ArrayOps<A> arrayOps

pageSize

protected int pageSize

capacity

protected long capacity

map

protected Map<Long,A> map

Constructor Details

BufferWithPages

public BufferWithPages(ArrayOps<A> arrayOps,
 int pageSize)

BufferWithPages

public BufferWithPages(ArrayOps<A> arrayOps,
 int pageSize,
 long capacity,
 Map<Long,A> map)

Method Details

getArrayOps

public ArrayOps<A> getArrayOps()

Specified by:

getArrayOps in interface HasArrayOps<A>

getPageMap

public Map<Long,A> getPageMap()

create

public static <A> BufferWithPages<A> create(ArrayOps<A> arrayOps,
 int pageSize)

write

public void write(long offsetInBuffer,
 A arrayWithItemsOfTypeT,
 int arrOffset,
 int arrLength)

Description copied from interface: ArrayWritable

The method that needs to be implemented; all other methods default-delegate to this one.

Specified by:

write in interface ArrayWritable<A>

readInto

public int readInto(Object tgt,
 int tgtOffset,
 long srcOffset,
 int length)

Specified by:

readInto in interface ArrayReadable<A>

getCapacity

public long getCapacity()

Description copied from interface: BufferLike

Buffers with 'unlimited' capacity should return Long.MAX_VALUE

Specified by:

getCapacity in interface BufferLike<A>

get

public Object get(long index)

Specified by:

get in interface ArrayReadable<A>

put

public void put(long index,
 Object item)

Specified by:

put in interface ArrayWritable<A>