org.xmlBlaster.util
Class Timestamp

java.lang.Object
  org.xmlBlaster.util.Timestamp

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable

Direct Known Subclasses:

QueueEntryId, RcvTimestamp

public class Timestamp
extends java.lang.Object
implements java.lang.Comparable, java.io.Serializable

High performing timestamp class, time elapsed since 1970, the nanos are simulated as a unique counter.
The counter is rewound on any millisecond step.
Timestamp objects are immutable - a Timstamp can not be changed once it is created.
Guarantees that any created Timestamp instance is unique in the current Java Virtual Machine (and Classloader).

Fails only if

• a CPU can create more than 999999 Timestamp instances per millisecond
• In ~ 288 years when Long.MAX_VALUE = 9223372036854775807 overflows (current value is 1013338358124000008)

A typical output is:

• toString()=2002-02-10 11:57:51.804000001
• getTimestamp()=1013338671804000001
• getMillis()=1013338671804
• getMillisOnly()=804
• getNanosOnly()=804000001

Performance hints (600 MHz Intel PC, Linux 2.4.10, JDK 1.3.1):

• new Timestamp() 1.2 micro seconds
• toString() 55 micro seconds the first time, further access 0.1 micro seconds
• valueOf() 19 micro seconds
• toXml("", false) 16 micro seconds
• toXml("", true) 17 micro seconds

XML representation:

  <timestamp nanos='1013346248150000001'>
     2002-02-10 14:04:08.150000001
  </timestamp>
 

or

  <timestamp nanos='1013346248150000001'/>
 

Author:

Marcel Ruff

See Also:

TimestampTest, Serialized Form

Field Summary

static int	BILLION
private static long	lastMillis
static int	MILLION
private static int	nanoCounter
private static long	serialVersionUID
private java.lang.String	strFormat Cache for string representation
protected java.lang.String	tagName You may overwrite the tag name for XML dumps in derived classes, defaults to <timestamp ...
private long	timestamp The timestamp in nanoseconds
private java.lang.Long	timestampLong

Constructor Summary

Timestamp()
Constructs a current timestamp which is guaranteed to be unique in time for this JVM

Timestamp(long nanos)
Create a Timestamp with given nanoseconds since 1970

Method Summary

int	compareTo(java.lang.Object obj) Compares two Timestamps for ordering.
boolean	equals(java.lang.Object obj) Compares this object against the specified object.
boolean	equals(Timestamp ts) Tests to see if this Timestamp object is equal to the given Timestamp object.
long	getMillis() You can use this value for java.util.Date(millis)
int	getMillisOnly() The milli part only
int	getNanosOnly() The nano part only
long	getTime() You can use this value for java.util.Date(millis)
long	getTimestamp()
java.lang.Long	getTimestampLong() We cache a Long object for reuse (helpful when used as a key in a map).
static void	main(java.lang.String[] args) Test only.
static java.lang.String	millisToNice(long millis) Convert milliseconds to some more human readable representation.
static void	sleep(long millis) Stop execution for some given milliseconds.
private static Timestamp	test(java.lang.StringBuffer buf) Test only
private static void	testToString() Test only
private static void	testToXml(boolean literal) Test only
private static void	testValueOf() Test only
java.lang.String	toString() Timestamp in JDBC Timestamp escape format (human readable).
java.lang.String	toXml()
java.lang.String	toXml(java.lang.String extraOffset)
java.lang.String	toXml(java.lang.String extraOffset, boolean literal) Dump state of this object into a XML ASCII string.
static Timestamp	valueOf(java.lang.String s) Converts a String object in JDBC timestamp escape format to a Timestamp value.

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

MILLION

public static final int MILLION

See Also:

Constant Field Values

BILLION

public static final int BILLION

See Also:

Constant Field Values

nanoCounter

private static int nanoCounter

lastMillis

private static long lastMillis

timestamp

private final long timestamp

The timestamp in nanoseconds

timestampLong

private transient java.lang.Long timestampLong

strFormat

private transient java.lang.String strFormat

Cache for string representation

tagName

protected java.lang.String tagName

You may overwrite the tag name for XML dumps in derived classes, defaults to <timestamp ...

Constructor Detail

Timestamp

public Timestamp()

Constructs a current timestamp which is guaranteed to be unique in time for this JVM

Throws:

java.lang.RuntimeException - on overflow (never happens :-=)

Timestamp

public Timestamp(long nanos)

Create a Timestamp with given nanoseconds since 1970

See Also:

Date

Method Detail

getTimestamp

public final long getTimestamp()

Returns:

The exact timestamp in nanoseconds

getTimestampLong

public final java.lang.Long getTimestampLong()

We cache a Long object for reuse (helpful when used as a key in a map).

Returns:

The exact timestamp in nanoseconds

getNanosOnly

public final int getNanosOnly()

The nano part only

Returns:

The nano part only

getMillisOnly

public final int getMillisOnly()

The milli part only

Returns:

The milli part only

getMillis

public final long getMillis()

You can use this value for java.util.Date(millis)

Returns:

Rounded to millis

See Also:

getTime(), Date

getTime

public final long getTime()

You can use this value for java.util.Date(millis)

Returns:

Rounded to millis

See Also:

getMillis(), Date

toString

public java.lang.String toString()

Timestamp in JDBC Timestamp escape format (human readable).

Overrides:

toString in class java.lang.Object

Returns:

The Timestamp in JDBC Timestamp escape format: "2002-02-10 10:52:40.879456789"

valueOf

public static Timestamp valueOf(java.lang.String s)

Converts a String object in JDBC timestamp escape format to a Timestamp value.

Parameters:

s - timestamp in format yyyy-mm-dd hh:mm:ss.fffffffff

Returns:

corresponding Timestamp value

Throws:

java.lang.IllegalArgumentException - if the given argument does not have the format yyyy-mm-dd hh:mm:ss.fffffffff

compareTo

public int compareTo(java.lang.Object obj)

Compares two Timestamps for ordering.

Specified by:

compareTo in interface java.lang.Comparable

Parameters:

ts - The Timestamp to be compared.

Returns:

the value 0 if the argument Timestamp is equal to this Timestamp; a value less than 0 if this Timestamp is before the Timestamp argument; and a value greater than 0 if this Timestamp is after the Timestamp argument.

equals

public boolean equals(Timestamp ts)

Tests to see if this Timestamp object is equal to the given Timestamp object.

Parameters:

stamp - the Timestamp value to compare with

Returns:

true if the given Timestamp object is equal to this Timestamp object; false otherwise

equals

public boolean equals(java.lang.Object obj)

Compares this object against the specified object. The result is true if and only if the argument is not null and is a Long object that contains the same long value as this object.

Overrides:

equals in class java.lang.Object

Parameters:

obj - the object to compare with.

Returns:

true if the objects are the same; false otherwise.

toXml

public final java.lang.String toXml()

Returns:

internal state of the Timestamp as an XML ASCII string

toXml

public final java.lang.String toXml(java.lang.String extraOffset)

Returns:

internal state of the Timestamp as an XML ASCII string without human readable JDBC formatting

toXml

public final java.lang.String toXml(java.lang.String extraOffset,
                                    boolean literal)

Dump state of this object into a XML ASCII string.

Parameters:

extraOffset - indenting of tags for nice output

literal - true -> show human readable format as well (JDBC escape format) "2002-02-10 10:52:40.879456789"

Returns:

internal state of the Timestamp as a XML ASCII string

millisToNice

public static final java.lang.String millisToNice(long millis)

Convert milliseconds to some more human readable representation.

Parameters:

millis - An amount of elapsed milliseconds

Returns:

A human readable time string

sleep

public static void sleep(long millis)

Stop execution for some given milliseconds. Returns earlier on Interrupted exception

Parameters:

millis - amount of milliseconds to wait

main

public static void main(java.lang.String[] args)

Test only.

 javac -g -d $XMLBLASTER_HOME/classes Timestamp.java

   java org.xmlBlaster.util.Timestamp

 Dump a nanosecond 'long' to a string representation:
    
   java org.xmlBlaster.util.Timestamp 1076677832527000001

 Dump a a string representation to a nanosecond 'long':

   java org.xmlBlaster.util.Timestamp "2004-02-13 14:10:32.527000001"
 

test

private static final Timestamp test(java.lang.StringBuffer buf)

Test only

testToString

private static final void testToString()

Test only

testValueOf

private static final void testValueOf()

Test only

testToXml

private static final void testToXml(boolean literal)

Test only