com.mxgraph.sharing
Class mxSession

java.lang.Object
  com.mxgraph.sharing.mxSession

All Implemented Interfaces:

mxSharedDiagram.mxDiagramChangeListener

public class mxSession
extends Object
implements mxSharedDiagram.mxDiagramChangeListener

Implements a session that may be attached to a shared diagram.

Field Summary

protected StringBuffer	buffer Holds the send buffer for this session.
static int	DEFAULT_TIMEOUT Default timeout is 10000 ms.
protected mxSharedDiagram	diagram Reference to the shared diagram.
protected String	id Holds the session ID.
protected long	lastTimeMillis Holds the last active time millis.

Constructor Summary

mxSession(String id, mxSharedDiagram diagram)
Constructs a new session with the given ID.

Method Summary

void	destroy() Destroys the session and removes its listener from the shared diagram.
void	diagramChanged(Object sender, String xml) Fires when the shared diagram was changed.
String	getId() Returns the session ID.
String	getInitialState() Returns an XML string that represents the current state of the session and the shared diagram.
long	inactiveTimeMillis() Returns the number of milliseconds this session has been inactive.
String	init() Initializes the session buffer and returns a string that represents the state of the session.
String	poll() Returns the changes received by other sessions for the shared diagram.
String	poll(long timeout) Returns the changes received by other sessions for the shared diagram.
void	post(String xml) Posts the change represented by the given XML string to the shared diagram.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_TIMEOUT

public static int DEFAULT_TIMEOUT

Default timeout is 10000 ms.

id

protected String id

Holds the session ID.

diagram

protected mxSharedDiagram diagram

Reference to the shared diagram.

buffer

protected StringBuffer buffer

Holds the send buffer for this session.

lastTimeMillis

protected long lastTimeMillis

Holds the last active time millis.

Constructor Detail

mxSession

public mxSession(String id,
                 mxSharedDiagram diagram)

Constructs a new session with the given ID.

Parameters:

id - Specifies the session ID to be used.

diagram - Reference to the shared diagram.

Method Detail

getId

public String getId()

Returns the session ID.

getInitialState

public String getInitialState()

Returns an XML string that represents the current state of the session and the shared diagram. A globally unique ID is used as the session's namespace, which is used on the client side to prefix IDs of newly created cells.

init

public String init()

Initializes the session buffer and returns a string that represents the state of the session.

Returns:

Returns the initial state of the session.

post

public void post(String xml)

Posts the change represented by the given XML string to the shared diagram.

Parameters:

xml - XML string that represents the change.

poll

public String poll()
            throws InterruptedException

Returns the changes received by other sessions for the shared diagram. The method returns an empty XML node if no change was received within 10 seconds.

Returns:

Returns a string representing the changes to the shared diagram.

Throws:

InterruptedException

poll

public String poll(long timeout)
            throws InterruptedException

Returns the changes received by other sessions for the shared diagram. The method returns an empty XML node if no change was received within the given timeout.

Parameters:

timeout - Time in milliseconds to wait for changes.

Returns:

Returns a string representing the changes to the shared diagram.

Throws:

InterruptedException

inactiveTimeMillis

public long inactiveTimeMillis()

Returns the number of milliseconds this session has been inactive.

diagramChanged

public void diagramChanged(Object sender,
                           String xml)

Description copied from interface: mxSharedDiagram.mxDiagramChangeListener

Fires when the shared diagram was changed.

Specified by:

diagramChanged in interface mxSharedDiagram.mxDiagramChangeListener

Parameters:

sender - Session where the change was received from.

xml - XML string that represents the change.

destroy

public void destroy()

Destroys the session and removes its listener from the shared diagram.