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java.rmi.dgc
Class VMID  

java.lang.Object
  java.rmi.dgc.VMID

All Implemented Interfaces:

java.io.Serializable

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public final class VMID

extends java.lang.Object

implements java.io.Serializable

An identifier that is unique accross the all virtual machines. This class is used by distributed garbage collector to identify the virtual machine of the client, but may also be used in various other cases, when such identifier is required. This class separately stores and transfers the host IP address, but will try to do its best also for the case if it failed to determine it. The alternative algorithms are used in java.rmi.server.UID that is part of this class. The VMID's, created on the same host, but in the two separately (parallely) running virtual machines are different.

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Field Summary
private  byte[]	addr           The IP address of the local host.
(package private) static boolean	areWeUnique           If true, the IP of this host can ve reliably determined.
(package private)  int	hash           The cached hash code.
(package private) static byte[]	localAddr           The IP address of the local host.
(package private) static long	serialVersionUID           Use SVUID for interoperability.
private  java.rmi.server.UID	uid           The UID of this VMID.

 

Constructor Summary

VMID()           Create the new VMID.

 

Method Summary
boolean	equals(java.lang.Object obj)           Returns true if the passed parameter is also VMID and it is equal to this VMID.
int	hashCode()           Get the hash code of this VMID.
static boolean	isUnique()           Deprecated. VMID's are more or less always reliable.
java.lang.String	toString()           Get the string representation of this VMID.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

serialVersionUID

static final long serialVersionUID

Use SVUID for interoperability.

See Also:

Constant Field Values

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areWeUnique

static boolean areWeUnique

If true, the IP of this host can ve reliably determined.

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localAddr

static byte[] localAddr

The IP address of the local host.

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addr

private byte[] addr

The IP address of the local host.

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hash

transient int hash

The cached hash code.

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uid

private java.rmi.server.UID uid

The UID of this VMID.

Constructor Detail

VMID

public VMID()

Create the new VMID. All VMID's are unique accross tha all virtual machines.

Method Detail

isUnique

public static boolean isUnique()

Deprecated. VMID's are more or less always reliable.

Return true if it is possible to get the accurate address of this host. If false is returned, the created VMID's are less reliable, but the starting time and possibly the memory allocation are also taken into consideration in the incorporated UID. Hence the VMID's, created on the different virtual machines, still should be different.

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hashCode

public int hashCode()

Get the hash code of this VMID.

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equals

public boolean equals(java.lang.Object obj)

Returns true if the passed parameter is also VMID and it is equal to this VMID. The VMID should only be equal to itself (also if the passed value is another instance, cloned by serialization).

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toString

public java.lang.String toString()

Get the string representation of this VMID.

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