java.rmi.dgc

Class VMID

Implemented Interfaces:
Serializable

public final class VMID
extends Object
implements 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 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.
See Also:
Serialized Form

Constructor Summary

VMID()
Create the new VMID.

Method Summary

boolean
equals(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.
String
toString()
Get the string representation of this VMID.

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

VMID

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

Method Details

equals

public boolean equals(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).
Overrides:
equals in interface Object

hashCode

public int hashCode()
Get the hash code of this VMID.
Overrides:
hashCode in interface Object

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.
Returns:
false if the local host ip address is 127.0.0.1 or unknown, true otherwise.

toString

public String toString()
Get the string representation of this VMID.
Overrides:
toString in interface Object

VMID.java -- The object ID, unique between all virtual machines. Copyright (c) 1996, 1997, 1998, 1999, 2006 Free Software Foundation, Inc. This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.