org.apache.mina.filter.executor

Class DefaultIoEventSizeEstimator

java.lang.Object

org.apache.mina.filter.executor.DefaultIoEventSizeEstimator

All Implemented Interfaces:

IoEventSizeEstimator

public class DefaultIoEventSizeEstimator
extends java.lang.Object
implements IoEventSizeEstimator

A default IoEventSizeEstimator implementation.

Martin's Java Notes was used for estimation. For unknown types, it inspects declaring fields of the class of the specified event and the parameter of the event. The size of unknown declaring fields are approximated to the specified averageSizePerField (default: 64).

All the estimated sizes of classes are cached for performance improvement.

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.concurrent.ConcurrentMap<java.lang.Class<?>,java.lang.Integer>	class2size A map containing the estimated size of each Java objects we know for

Constructor Summary

Constructors

Constructor and Description
DefaultIoEventSizeEstimator() Create a new instance of this class, injecting the known size of basic java types.

Method Summary

Modifier and Type	Method and Description
private static int	align(int size)
private int	estimateSize(java.lang.Class<?> clazz, java.util.Set<java.lang.Class<?>> visitedClasses)
int	estimateSize(IoEvent event) Estimate the IoEvent size in number of bytes
int	estimateSize(java.lang.Object message) Estimate the size of an Object in number of bytes

Methods inherited from class java.lang.Object

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

Field Detail

class2size

private final java.util.concurrent.ConcurrentMap<java.lang.Class<?>,java.lang.Integer> class2size

A map containing the estimated size of each Java objects we know for

Constructor Detail

DefaultIoEventSizeEstimator

public DefaultIoEventSizeEstimator()

Create a new instance of this class, injecting the known size of basic java types.

Method Detail

estimateSize

public int estimateSize(IoEvent event)

Estimate the IoEvent size in number of bytes

Specified by:

estimateSize in interface IoEventSizeEstimator

Parameters:

event - The event we want to estimate the size of

Returns:

The estimated size of this event

estimateSize

public int estimateSize(java.lang.Object message)

Estimate the size of an Object in number of bytes

Parameters:

message - The object to estimate

Returns:

The estimated size of the object

estimateSize

private int estimateSize(java.lang.Class<?> clazz,
                         java.util.Set<java.lang.Class<?>> visitedClasses)

align

private static int align(int size)