org.apache.ignite.internal.visor.igfs

Class VisorIgfsProfilerUniformityCounters

java.lang.Object

org.apache.ignite.internal.visor.VisorDataTransferObject

org.apache.ignite.internal.visor.igfs.VisorIgfsProfilerUniformityCounters

All Implemented Interfaces:

Externalizable, Serializable

public class VisorIgfsProfilerUniformityCounters
extends VisorDataTransferObject

Class to support uniformity calculation.

Uniformity calculated as coefficient of variation.

Count read frequency for each file and compare with ideal uniform distribution.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.ignite.internal.visor.VisorDataTransferObject

V1, V2

Constructor Summary

Constructors

Constructor and Description
VisorIgfsProfilerUniformityCounters() Default constructor.

Method Summary

Methods

Modifier and Type	Method and Description
void	aggregate(VisorIgfsProfilerUniformityCounters other) Add given counters.
double	calc() Calculate uniformity as standard deviation.
void	increment(long pos, long len) Increment counters by given pos and length.
void	invalidate(long newFileSize) Check if counters and blockSize should be adjusted according to file size.
protected void	readExternalData(byte protoVer, ObjectInput in) Load object's specific data content.
String	toString()
protected void	writeExternalData(ObjectOutput out) Save object's specific data content.

Methods inherited from class org.apache.ignite.internal.visor.VisorDataTransferObject

getProtocolVersion, readExternal, toList, toSet, writeExternal

Methods inherited from class java.lang.Object

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

Constructor Detail

VisorIgfsProfilerUniformityCounters

public VisorIgfsProfilerUniformityCounters()

Default constructor.

Method Detail

invalidate

public void invalidate(long newFileSize)

Check if counters and blockSize should be adjusted according to file size.

Parameters:

newFileSize - New size of file.

increment

public void increment(long pos,
             long len)

Increment counters by given pos and length.

Parameters:

pos - Position in file.

len - Read data length.

aggregate

public void aggregate(VisorIgfsProfilerUniformityCounters other)

Add given counters.

Parameters:

other - Counters to add.

calc

public double calc()

Calculate uniformity as standard deviation. See: http://en.wikipedia.org/wiki/Standard_deviation.

Returns:

Uniformity value as number in 0..1 range.

writeExternalData

protected void writeExternalData(ObjectOutput out)
                          throws IOException

Save object's specific data content.

Specified by:

writeExternalData in class VisorDataTransferObject

Parameters:

out - Output object to write data content.

Throws:

IOException - If I/O errors occur.

readExternalData

protected void readExternalData(byte protoVer,
                    ObjectInput in)
                         throws IOException,
                                ClassNotFoundException

Load object's specific data content.

Specified by:

readExternalData in class VisorDataTransferObject

Parameters:

protoVer - Input object version.

in - Input object to load data content.

Throws:

IOException - If I/O errors occur.

ClassNotFoundException - If the class for an object being restored cannot be found.

toString

public String toString()

Overrides:

toString in class Object