UID

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java.rmi.server
Class UID

java.lang.Object
  java.rmi.server.UID

All Implemented Interfaces:: java.io.Serializable

public final class UID
extends java.lang.Object
implements java.io.Serializable

Represents the unique identifier over time for the host which has generated it. It contains time (when created), counter (the number of the UID creation order) and virtual machine id components. The UID can also be constructed specifying a "well known" identifier in the for of short: this identifier defines the UID uniqueness alone.

Field Summary

private short count
          The UID number in the UID creation sequence.

private static long last
          The time, when the last UID has been created.

private static int machineId
          This constant tries to be the unique identifier of the virtual machine.

private static long serialVersionUID
          Use the serial version uid for interoperability.

private long time
          The time stamp, when the UID was created.

private static short uidCounter
          The UID counter (the ordinary number in the sequence of number of UID's, created during the recent millisecond).

private int unique
          Always gets the uniqueNr value.

Constructor Summary

UID()
          Create the new UID that would have the described features of the uniqueness.

UID(short wellKnownId)
          Create the new UID with the well known id (number).

Method Summary

boolean equals(java.lang.Object other)
          Compare this UID with another UID for equality (not equal to other types of objects).

(package private) static int getMachineId()
          Do our best to get the Id of this virtual machine.

int hashCode()
          Get the hashCode of this UID.

static UID read(java.io.DataInput in)


java.lang.String toString()
          Get the string representation of this UID.

void write(java.io.DataOutput out)


Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

Use the serial version uid for interoperability.

See Also:: Constant Field Values

uidCounter

private static short uidCounter

The UID counter (the ordinary number in the sequence of number of UID's, created during the recent millisecond). In the next millisecond, it starts from the minimal value again. In the unlikely case of creating more than 65536 uids per millisecond the process pauses till the next ms.

last

private static long last

The time, when the last UID has been created.

machineId

private static final int machineId

This constant tries to be the unique identifier of the virtual machine.

count

private short count

The UID number in the UID creation sequence.

unique

private int unique

Always gets the uniqueNr value.

time

private long time

The time stamp, when the UID was created.

Constructor Detail

UID

public UID()

Create the new UID that would have the described features of the uniqueness.

UID

public UID(short wellKnownId)

Create the new UID with the well known id (number). All UIDs, creates with the this constructor having the same parameter are equal to each other (regardless to the host and time where they were created.

Method Detail

hashCode

public int hashCode()

Get the hashCode of this UID.

equals

public boolean equals(java.lang.Object other)

Compare this UID with another UID for equality (not equal to other types of objects).

read

public static UID read(java.io.DataInput in)
                throws java.io.IOException

write

public void write(java.io.DataOutput out)
           throws java.io.IOException

getMachineId

static int getMachineId()

Do our best to get the Id of this virtual machine.

toString

public java.lang.String toString()

Get the string representation of this UID.