uk.ac.ic.doc.automed.p2p.state
Class PeerStateHandler

java.lang.Object
  uk.ac.ic.doc.automed.p2p.state.PeerStateHandler

Direct Known Subclasses:

DHTRoutingState

public class PeerStateHandler
extends java.lang.Object

Field Summary

protected int	_currentState
private java.util.List	_stateListeners
static int	STATE_HELLO_COMPLETE
static int	STATE_HELLO_INIT
static int	STATE_INIT
static int	STATE_JOINED_GLOBAL
static int	STATE_JOINED_LOCAL
static int	STATE_REGISTER_GLOBAL
static int	STATE_STAND_ALONE

Constructor Summary

PeerStateHandler()
Creates a new instance of PeerStateHandler

Method Summary

void	addListener(StateChangedListener listener) Register an interested listener
void	changePeerState(int newState) It handle all state transitions in one method, throwing exceptions when conflicts occur .
int	getPeerState() Return the current peer state
protected void	notifyListeners() Inform interested listeners of a state change event

Methods inherited from class java.lang.Object

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

Field Detail

STATE_INIT

public static final int STATE_INIT

See Also:

Constant Field Values

STATE_STAND_ALONE

public static final int STATE_STAND_ALONE

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Constant Field Values

STATE_HELLO_INIT

public static final int STATE_HELLO_INIT

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Constant Field Values

STATE_HELLO_COMPLETE

public static final int STATE_HELLO_COMPLETE

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Constant Field Values

STATE_JOINED_LOCAL

public static final int STATE_JOINED_LOCAL

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Constant Field Values

STATE_REGISTER_GLOBAL

public static final int STATE_REGISTER_GLOBAL

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Constant Field Values

STATE_JOINED_GLOBAL

public static final int STATE_JOINED_GLOBAL

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Constant Field Values

_currentState

protected int _currentState

_stateListeners

private java.util.List _stateListeners

Constructor Detail

PeerStateHandler

public PeerStateHandler()

Creates a new instance of PeerStateHandler

Parameters:

AutoMedPeer - a reference to the AutoMedPeer

Method Detail

addListener

public void addListener(StateChangedListener listener)

Register an interested listener

changePeerState

public void changePeerState(int newState)
                     throws StateChangedException

It handle all state transitions in one method, throwing exceptions when
conflicts occur
. This method is synchronized to make sure that peer's states are updated
in order.

Throws:

StateChangedException

notifyListeners

protected void notifyListeners()

Inform interested listeners of a state change event

getPeerState

public int getPeerState()

Return the current peer state

Returns:

int the current peer state