edu.vub.at.actors.net
Class VMAddressBook

java.lang.Object
  edu.vub.at.actors.net.VMAddressBook

public class VMAddressBook

extends java.lang.Object

The VMAddressBook encapsulates the bi-directional mapping: AmbientTalk VM GUID --> JGroups Address JGroups Address --> AmbientTalk VM GUID It is necessary to maintain such a mapping to correctly identify and restore the connection between AmbientTalk VMs. A JGroups address cannot be used as a good identification key because an AmbientTalk VM may be known under different addresses as it goes offline and online. When a new VM joins, after handshaking, an entry is added to the address book. When a VM disjoins, the entry corresponding to the address that went offline is removed.

Author:

elgonzal, tvcutsem

Field Summary

private java.util.Hashtable	addressToGuid_
private java.util.Hashtable	guidToAddress_

Constructor Summary

VMAddressBook()

Method Summary

void	addEntry(GUID vmId, org.jgroups.Address vmAddress)
org.jgroups.Address	getAddressOf(GUID vmId) Resolve a remote VM's unique identifier to a concrete network address.
GUID	getGUIDOf(org.jgroups.Address vmAddress) Resolve a concrete network address to a remote VM's unique identifier.
void	removeEntry(org.jgroups.Address vmAddress) Remove all entries that map to this VM address from the VM Address book.

Methods inherited from class java.lang.Object

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

Field Detail

guidToAddress_

private final java.util.Hashtable guidToAddress_

addressToGuid_

private final java.util.Hashtable addressToGuid_

Constructor Detail

VMAddressBook

public VMAddressBook()

Method Detail

addEntry

public void addEntry(GUID vmId,
                     org.jgroups.Address vmAddress)

removeEntry

public void removeEntry(org.jgroups.Address vmAddress)

Remove all entries that map to this VM address from the VM Address book.

getAddressOf

public org.jgroups.Address getAddressOf(GUID vmId)

Resolve a remote VM's unique identifier to a concrete network address.

getGUIDOf

public GUID getGUIDOf(org.jgroups.Address vmAddress)

Resolve a concrete network address to a remote VM's unique identifier.