Package org.infinispan.commons.marshall

Class AdaptiveBufferSizePredictor

java.lang.Object

org.infinispan.commons.marshall.AdaptiveBufferSizePredictor

All Implemented Interfaces:

BufferSizePredictor

public class AdaptiveBufferSizePredictor
extends Object
implements BufferSizePredictor

The BufferSizePredictor that automatically increases and decreases the predicted buffer size on feed back.

It gradually increases the expected number of bytes if the previous buffer fully filled the allocated buffer. It gradually decreases the expected number of bytes if the read operation was not able to fill a certain amount of the allocated buffer two times consecutively. Otherwise, it keeps returning the same prediction. TODO: Object type hints could be useful at giving more type-specific predictions

Since:

5.0

Author:

Trustin Lee, Galder Zamarreño

Constructor Summary

Constructors

Constructor	Description
AdaptiveBufferSizePredictor()	Creates a new predictor with the default parameters.
AdaptiveBufferSizePredictor(int minimum, int initial, int maximum)	Creates a new predictor with the specified parameters.

Method Summary

Modifier and Type	Method	Description
int	nextSize(Object obj)	Provide the next buffer size taking in account the object to store in the buffer.
void	recordSize(int previousSize)	Record the size of the of data in the last buffer used.

Methods inherited from class java.lang.Object

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

Constructor Details

AdaptiveBufferSizePredictor

public AdaptiveBufferSizePredictor()

Creates a new predictor with the default parameters. With the default parameters, the expected buffer size starts from 512, does not go down below 16, and does not go up above 65536.

AdaptiveBufferSizePredictor

public AdaptiveBufferSizePredictor(int minimum,
 int initial,
 int maximum)

Creates a new predictor with the specified parameters.

Parameters:

minimum - the inclusive lower bound of the expected buffer size

initial - the initial buffer size when no feed back was received

maximum - the inclusive upper bound of the expected buffer size

Method Details

nextSize

public int nextSize(Object obj)

Description copied from interface: BufferSizePredictor

Provide the next buffer size taking in account the object to store in the buffer.

Specified by:

nextSize in interface BufferSizePredictor

Parameters:

obj - instance that will be stored in the buffer

Returns:

int representing the next predicted buffer size

recordSize

public void recordSize(int previousSize)

Description copied from interface: BufferSizePredictor

Record the size of the of data in the last buffer used.

Specified by:

recordSize in interface BufferSizePredictor

Parameters:

previousSize - int representing the size of the last object buffered.