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Class JavaGroups.JavaStack.Protocols.STATE_TRANSFER 

java.lang.Object
   |
   +----JavaGroups.JavaStack.Protocol
           |
           +----JavaGroups.JavaStack.Protocols.STATE_TRANSFER
public class STATE_TRANSFER
extends Protocol
implements RequestHandler, Subject
State transfer layer. Upon receiving a GET_STATE event from JChannel, a MAKE_COPY message is sent to all members. When the originator receives MAKE_COPY, it queues all messages to the channel. When another member receives the message, it asks the JChannel to provide it with a copy of the current state (GetStateEvent is received by application, ReturnState() sends state down the stack). Then the current layer sends a unicast RETURN_STATE message to the coordinator, which returns the cached copy. When the state is received by the originator, the GET_STATE sender is unblocked with a GET_STATE_OK event up the stack (unless it already timed out).

Requires QUEUE layer on top.

Constructor Index

o STATE_TRANSFER()

Method Index

o Attach(Observer)
o Detach(Observer)
o Down(Event)
An event is to be sent down the stack.
o GetName()
All protocol names have to be unique !
o Handle(Message)
o Notify()
o RequiredUpServices()
List of events that are required to be answered by some layer above
o SetProperties(Properties)
Configures the protocol initially.
o Up(Event)
An event was received from the layer below.

Constructors

o STATE_TRANSFER 
 public STATE_TRANSFER()

Methods

o GetName 
 public String GetName()
All protocol names have to be unique !

Overrides:
GetName in class Protocol
o SetProperties 
 public boolean SetProperties(Properties props)
Configures the protocol initially.

Overrides:
SetProperties in class Protocol
o RequiredUpServices 
 public Vector RequiredUpServices()
List of events that are required to be answered by some layer above

Overrides:
RequiredUpServices in class Protocol
o Up 
 public void Up(Event evt)
An event was received from the layer below.

Overrides:
Up in class Protocol
o Down 
 public void Down(Event evt)
An event is to be sent down the stack.

Overrides:
Down in class Protocol
o Handle 
 public Object Handle(Message msg)
o Attach 
 public void Attach(Observer o)
o Detach 
 public void Detach(Observer o)
o Notify 
 public void Notify()

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