org.jlab.coda.emu

Class EmuUtilities

java.lang.Object

org.jlab.coda.emu.EmuUtilities

public class EmuUtilities
extends java.lang.Object

Collection of useful methods.

Author:

timmer (8/6/14)

Constructor Summary

Constructors

Constructor and Description
EmuUtilities()

Method Summary

Modifier and Type	Method and Description
static java.nio.ByteBuffer	deepCopy(java.nio.ByteBuffer source) Method to deep copy a ByteBuffer object.
static java.lang.String	doubleToString(double d, int places) Method to convert a double to a string with a specified number of decimal places.
static java.lang.String	inputStr(java.lang.String s) Method to wait on string from keyboard.
static int	powerOfTwo(int x, boolean roundUp) Return the power of 2 closest to the given argument.
static void	printStackTrace() This method prints out the current stack trace.
static void	setEventType(java.util.BitSet bSet, EventType eType) Encode the event type into the bit info word which will be in each evio block header.
static void	setFirstEvent(java.util.BitSet bSet) Encode the "is first event" into the bit info word which will be in evio block header.
static void	sleepNanos(long nanoDuration) Spin-yield loop based alternative to Thread.sleep Based on the code of Andy Malakov http://andy-malakov.blogspot.fr/2010/06/alternative-to-threadsleep.html .
static void	unsetFirstEvent(java.util.BitSet bSet) Encode the "is NOT first event" into the bit info word which will be in evio block header.

Methods inherited from class java.lang.Object

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

Constructor Detail

EmuUtilities

public EmuUtilities()

Method Detail

sleepNanos

public static void sleepNanos(long nanoDuration)
                       throws java.lang.InterruptedException

Spin-yield loop based alternative to Thread.sleep Based on the code of Andy Malakov http://andy-malakov.blogspot.fr/2010/06/alternative-to-threadsleep.html .

Parameters:

nanoDuration - nonoseconds to sleep.

Throws:

java.lang.InterruptedException - if thread interrupted.

printStackTrace

public static void printStackTrace()

This method prints out the current stack trace.

deepCopy

public static java.nio.ByteBuffer deepCopy(java.nio.ByteBuffer source)

Method to deep copy a ByteBuffer object.

Parameters:

source - source ByteBuffer.

Returns:

a copy of the source ByteBuffer.

doubleToString

public static java.lang.String doubleToString(double d,
                                              int places)

Method to convert a double to a string with a specified number of decimal places.

Parameters:

d - double to convert to a string

places - number of decimal places

Returns:

string representation of the double

inputStr

public static java.lang.String inputStr(java.lang.String s)

Method to wait on string from keyboard.

Parameters:

s - prompt string to print

Returns:

string typed in keyboard

setEventType

public static void setEventType(java.util.BitSet bSet,
                                EventType eType)

Encode the event type into the bit info word which will be in each evio block header. Put event type into bits 3-6 (starting at 0). Since version is in the first 8 bits, it's really bits 11-14 of the whole header word.

Parameters:

bSet - bit set which will become part of the bit info word

eType - event type to be encoded

setFirstEvent

public static void setFirstEvent(java.util.BitSet bSet)

Encode the "is first event" into the bit info word which will be in evio block header. 2nd bit of bitinfo, but 9th bit of header word.

Parameters:

bSet - bit set which will become part of the bit info word

unsetFirstEvent

public static void unsetFirstEvent(java.util.BitSet bSet)

Encode the "is NOT first event" into the bit info word which will be in evio block header. 2nd bit of bitinfo, but 9th bit of header word.

Parameters:

bSet - bit set which will become part of the bit info word

powerOfTwo

public static int powerOfTwo(int x,
                             boolean roundUp)

Return the power of 2 closest to the given argument.

Parameters:

x - value to get the power of 2 closest to.

roundUp - if true, round up, else down

Returns:

-1 if x is negative or the closest power of 2 to value