Package org.jboss.netty.channel
Class AdaptiveReceiveBufferSizePredictor
java.lang.Object
org.jboss.netty.channel.AdaptiveReceiveBufferSizePredictor
- All Implemented Interfaces:
ReceiveBufferSizePredictor
public class AdaptiveReceiveBufferSizePredictor
extends Object
implements ReceiveBufferSizePredictor
The
ReceiveBufferSizePredictor
that automatically increases and
decreases the predicted buffer size on feed back.
It gradually increases the expected number of readable bytes if the previous read fully filled the allocated buffer. It gradually decreases the expected number of readable 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.
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate boolean
(package private) static final int
(package private) static final int
(package private) static final int
private int
private static final int
private static final int
private final int
private final int
private int
private static final int[]
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Constructor Summary
ConstructorsConstructorDescriptionCreates a new predictor with the default parameters.AdaptiveReceiveBufferSizePredictor
(int minimum, int initial, int maximum) Creates a new predictor with the specified parameters. -
Method Summary
Modifier and TypeMethodDescriptionprivate static int
getSizeTableIndex
(int size) int
Predicts the capacity of theChannelBuffer
for the next read operation depending on the actual number of read bytes in the previous read operation.void
previousReceiveBufferSize
(int previousReceiveBufferSize) Updates this predictor by specifying the actual number of read bytes in the previous read operation.
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Field Details
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DEFAULT_MINIMUM
static final int DEFAULT_MINIMUM- See Also:
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DEFAULT_INITIAL
static final int DEFAULT_INITIAL- See Also:
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DEFAULT_MAXIMUM
static final int DEFAULT_MAXIMUM- See Also:
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INDEX_INCREMENT
private static final int INDEX_INCREMENT- See Also:
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INDEX_DECREMENT
private static final int INDEX_DECREMENT- See Also:
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SIZE_TABLE
private static final int[] SIZE_TABLE -
minIndex
private final int minIndex -
maxIndex
private final int maxIndex -
index
private int index -
nextReceiveBufferSize
private int nextReceiveBufferSize -
decreaseNow
private boolean decreaseNow
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Constructor Details
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AdaptiveReceiveBufferSizePredictor
public AdaptiveReceiveBufferSizePredictor()Creates a new predictor with the default parameters. With the default parameters, the expected buffer size starts from1024
, does not go down below64
, and does not go up above65536
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AdaptiveReceiveBufferSizePredictor
public AdaptiveReceiveBufferSizePredictor(int minimum, int initial, int maximum) Creates a new predictor with the specified parameters.- Parameters:
minimum
- the inclusive lower bound of the expected buffer sizeinitial
- the initial buffer size when no feed back was receivedmaximum
- the inclusive upper bound of the expected buffer size
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Method Details
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getSizeTableIndex
private static int getSizeTableIndex(int size) -
nextReceiveBufferSize
public int nextReceiveBufferSize()Description copied from interface:ReceiveBufferSizePredictor
Predicts the capacity of theChannelBuffer
for the next read operation depending on the actual number of read bytes in the previous read operation.- Specified by:
nextReceiveBufferSize
in interfaceReceiveBufferSizePredictor
- Returns:
- the expected number of readable bytes this time
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previousReceiveBufferSize
public void previousReceiveBufferSize(int previousReceiveBufferSize) Description copied from interface:ReceiveBufferSizePredictor
Updates this predictor by specifying the actual number of read bytes in the previous read operation.- Specified by:
previousReceiveBufferSize
in interfaceReceiveBufferSizePredictor
- Parameters:
previousReceiveBufferSize
- the actual number of read bytes in the previous read operation
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