nextapp.echoservlet
Class InstancePeer

java.lang.Object
  nextapp.echoservlet.InstancePeer

All Implemented Interfaces:

java.util.EventListener, javax.servlet.http.HttpSessionBindingListener, java.beans.PropertyChangeListener, java.io.Serializable

public final class InstancePeer

extends java.lang.Object

implements javax.servlet.http.HttpSessionBindingListener, java.beans.PropertyChangeListener, java.io.Serializable

A peer object for an user instance of an Echo application. Like EchoInstance, one instance of this class is created for each user.

See Also:

Serialized Form

Field Summary

private java.lang.String	applicationUri The URI required to make HTTP requests to this application.
private java.lang.String	cacheIdPrefix Generated three-digit hexadecimal prefix for all cache Ids.
private java.lang.String	characterEncoding The character encoding that will be used for all text-based renderings in the application.
private java.util.Set	clientActionProducers A container of all visible action-producing component peers.
private CacheableServiceWrapper	clientErrorService A per-user cacheable wrapper for the client error service.
private java.util.Set	clientInputProducers A container of all visible input-producing component peers.
private ClientProperties	clientProperties Information about the client browser.
private java.util.Map	componentMap A mapping between components and component peers.
private java.util.Set	connections A set of active Connection objects using this InstancePeer.
private java.util.Set	contentPanes A container of all visible content panes.
private Controller	controller A service that is used to coordinate re-rendering of content and other updates of the client's browser.
private CookieManager	cookieManager The CookieManager object responsible for handling cookies for this application instance.
private Id	defaultWindowId The Id of the window that will be rendered if no Id is provided.
private nextapp.echo.EchoInstance	echoInstance The application instance.
private java.lang.String	errorUri The URI to redirect the browser to in the event of an unrecoverable error.
private boolean	exiting True when the application is exiting.
private java.util.Map	idMap A mapping between ids and component peers.
private ImageRepository	imageRepository A repository of the ImagePeers used by this InstancePeer.
private IncomingUpdateQueue	incomingUpdateQueue Changes incoming from the client.
private boolean	initialized A flag indicating whether initialization has taken place (whether the init() method has been invoked).
private long	nextComponentId The next id value assigned to a component.
private OutgoingUpdateQueue	outgoingUpdateQueue Content that needs to be re-rendered.
private int	sequenceNumber The request sequence number.
private ServerContext	serverContext The server context that will be provided to this application's EchoInstance.
private ServiceRegistry	services A container of all services available to this application instance.
private javax.servlet.http.HttpSession	session A reference to the HTTP Session object in which this instance peer is being held.
private java.lang.String	terminationUri Null if the application does not desire to exit or a URI to direct the browser to if the application does desire to exit.
private java.security.Principal	userPrincipal The principal using the application.
private VariableData	variableData A container of all variables used for templated services in this application instance.
private java.util.Set	windows A container of all visible windows.

Constructor Summary

(package private)

InstancePeer(nextapp.echo.EchoInstance echoInstance, java.lang.String applicationUri) Creates a new instance peer for the provided instance.

Method Summary

private void	add(nextapp.echo.Component c, boolean visibilityChange) Registers the given component, and all visible components with visible parents beneath it.
(package private) void	addConnection(Connection conn) Adds an active connection to the internal list of connections.
private void	childrenChange(java.beans.PropertyChangeEvent e) Processes a property change event where a registered component has had children added or removed.
(package private) void	clearTerminationUri() Clears the termination URI.
(package private) void	exit(java.lang.String uri) Exits the application, redirecting an available browser window to the specified URI.
Id	generateId() Generates a unique (to the application) identifier.
(package private) java.lang.String	getApplicationUri() Returns the URI from which this application is available.
(package private) java.lang.String	getCacheIdPrefix() Returns a prefix to prepend to cache ids in order to ensure that incorrect cached resources are used by client in the event either the server or the users session has restarted.
(package private) java.lang.String	getCharacterEncoding() Returns the character encoding that will be used when communicating with the client browser.
(package private) Service	getClientErrorService() Returns the client error service for this user.
(package private) java.util.Iterator	getClientInputProducers() Returns an iterator over all registered ClientInputProducerss.
ClientProperties	getClientProperties() Returns the "client properties" data collected about the client of this InstancePeer.
PaneUI	getContainingPane(ComponentPeer componentPeer) Returns the PaneUI in which the given ComponentPeer is contained.
WindowUI	getContainingWindow(ComponentPeer componentPeer) Returns the WindowUI in which the given ComponentPeer is contained.
(package private) java.util.Iterator	getContentPanes() Returns an iterator over all registered content panes.
Service	getController() Returns this instance's Controller service.
CookieManager	getCookieManager() Returns the CookieManager used by this instance.
(package private) Id	getDefaultWindowId() Returns the Id of the application's default window.
(package private) java.lang.String	getErrorUri() Returns the URI the client is directed to in the event of an unrecoverable error.
ImageRepository	getImageRepository() Returns the image repository.
(package private) IncomingUpdateQueue	getIncomingUpdateQueue() Returns the application's incoming update queue.
nextapp.echo.EchoInstance	getInstance() Returns the EchoInstance object this peer supports.
(package private) OutgoingUpdateQueue	getOutgoingUpdateQueue() Returns the application's outgoing update queue.
ComponentPeer	getPeer(nextapp.echo.Component c) Returns the ComponentPeer that corresponds to the given Component.
ComponentPeer	getPeer(Id id) Returns the ComponentPeer that corresponds to the given Id.
Service	getSafeInvokeService() Returns the service that renders the script containing the safeInvoke() method.
(package private) int	getSequenceNumber() Returns the sequence number of the last successfully processed request from the client controller frame.
(package private) ServiceRegistry	getServiceRegistry() Returns the ServiceRegistry that is used by this instance to hold all Service objects available to it.
(package private) javax.servlet.ServletConfig	getServletConfig() Returns the ServletConfig object containing that the servlet container sent to the EchoServer's init() method (EchoServer extends HttpServlet).
(package private) javax.servlet.http.HttpSession	getSession() Returns the HttpSession object to which this instance peer is bound, or null if is not bound to a session.
(package private) java.lang.String	getTerminationUri() Returns null if the application does not desire to exit or a URI to direct the browser to if the application does desire to exit.
java.security.Principal	getUserPrincipal() Returns the principal (user) of this application.
(package private) VariableData	getVariableData() Returns the VariableData object used by this instance peer when rendering templated services.
(package private) java.util.Iterator	getWindows() Returns an iterator of all registered windows.
private boolean	hasPeer(nextapp.echo.Component c) Determines whether the specified component has a peer.
(package private) void	incrementSequenceNumber() Increments the value of the controller frame sequence number by one.
(package private) void	init() Initializes this InstancePeer, causing the represented EchoInstance to also initialize.
(package private) boolean	isExiting() Returns true if the application is exiting and should have therefore have its session invalidated.
(package private) boolean	isUserInRole(java.lang.String role) Returns true if the user of the application is in the specified role.
(package private) void	lowerWindow(WindowUI windowUI) Lowers the specified window to the background.
void	propertyChange(java.beans.PropertyChangeEvent e) Handler for PropertyChangeEvents.
(package private) void	raiseWindow(WindowUI windowUI) Raises the specified window to the foreground.
void	redraw(ComponentPeer componentPeer) Causes the service containing the given component to be re-rendered.
private void	register(nextapp.echo.Component c) Registers a component.
private void	remove(nextapp.echo.Component c, boolean visibilityChange) Recursively removes a component and its descendants from the InstancePeer by unregistering their peer objects and removing the InstancePeer from their lists of property change listeners.
(package private) void	removeConnection(Connection conn) Removes an active connection from the internal list of connections.
(package private) void	restart() Restarts application by suspending to applciation's own URI.
(package private) void	setCharacterEncoding(java.lang.String newValue) Returns the character encoding that will be used when communicating with the client browser.
(package private) void	setClientProperties(ClientProperties clientProperties) Sets the client properties for the user.
(package private) void	setErrorUri(java.lang.String errorUri) Sets the URI the client is directed to in the event of an unrecoverable error.
void	setTitle(WindowUI windowUI) Causes the specified window's title to be updated on the client.
(package private) void	setUserPrincipal(java.security.Principal userPrincipal) Sets the principal (user) that is using the application.
(package private) void	suspend(java.lang.String uri) Suspends the application, redirecting an available browser window to the specified URI.
private void	unregister(nextapp.echo.Component c) Unregisters a component.
private void	updateLocalizedResources() Updates localized resources.
void	valueBound(javax.servlet.http.HttpSessionBindingEvent e) Listener implementation of HttpSessionBindingListener.
void	valueUnbound(javax.servlet.http.HttpSessionBindingEvent e) Listener implementation of Mcode>HttpSessionBindingListener.
private void	visibilityChange(java.beans.PropertyChangeEvent e) Handles the case where a registered component or immediate invisible descendent of a registered component has changed visibility.

Methods inherited from class java.lang.Object

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

Field Detail

session

private transient javax.servlet.http.HttpSession session

A reference to the HTTP Session object in which this instance peer is being held. Marked as transient to avoid serializing the session when individual applications are being serialized.

cacheIdPrefix

private final java.lang.String cacheIdPrefix

Generated three-digit hexadecimal prefix for all cache Ids. This is included to eliminate programmer headaches where the server has been restarted and is reassigning ids that may be cached by their test browser. This is also required to prevent similar problems when a user's session has expired and a new one has been created, but resources remain cached on the server. This String will be of the form "f15_".

componentMap

private final java.util.Map componentMap

A mapping between components and component peers.

idMap

private final java.util.Map idMap

A mapping between ids and component peers.

windows

private final java.util.Set windows

A container of all visible windows.

clientActionProducers

private final java.util.Set clientActionProducers

A container of all visible action-producing component peers.

clientInputProducers

private final java.util.Set clientInputProducers

A container of all visible input-producing component peers.

contentPanes

private final java.util.Set contentPanes

A container of all visible content panes.

variableData

private final VariableData variableData

A container of all variables used for templated services in this application instance.

clientErrorService

private final CacheableServiceWrapper clientErrorService

A per-user cacheable wrapper for the client error service. This enables the client error service to be cached unless locale is changed.

services

private final ServiceRegistry services

A container of all services available to this application instance.

incomingUpdateQueue

private final IncomingUpdateQueue incomingUpdateQueue

Changes incoming from the client.

outgoingUpdateQueue

private final OutgoingUpdateQueue outgoingUpdateQueue

Content that needs to be re-rendered.

controller

private final Controller controller

A service that is used to coordinate re-rendering of content and other updates of the client's browser.

echoInstance

private final nextapp.echo.EchoInstance echoInstance

The application instance.

applicationUri

private final java.lang.String applicationUri

The URI required to make HTTP requests to this application.

clientProperties

private ClientProperties clientProperties

Information about the client browser.

defaultWindowId

private Id defaultWindowId

The Id of the window that will be rendered if no Id is provided.

errorUri

private java.lang.String errorUri

The URI to redirect the browser to in the event of an unrecoverable error.

initialized

private boolean initialized

A flag indicating whether initialization has taken place (whether the init() method has been invoked).

characterEncoding

private java.lang.String characterEncoding

The character encoding that will be used for all text-based renderings in the application.

exiting

private boolean exiting

True when the application is exiting.

terminationUri

private java.lang.String terminationUri

Null if the application does not desire to exit or a URI to direct the browser to if the application does desire to exit.

cookieManager

private CookieManager cookieManager

The CookieManager object responsible for handling cookies for this application instance.

serverContext

private ServerContext serverContext

The server context that will be provided to this application's EchoInstance.

userPrincipal

private java.security.Principal userPrincipal

The principal using the application.

nextComponentId

private long nextComponentId

The next id value assigned to a component.

sequenceNumber

private int sequenceNumber

The request sequence number. Ensures that operations are not performed based on input received from previously processed controller frames that may get submitted as a result of the user hitting the reload button on the browser.

connections

private transient java.util.Set connections

A set of active Connection objects using this InstancePeer. An active Connection may be needed for use by the InstancePeer by certain operations, such as isUserInRole() which requires the use of a Connection's HttpServletRequest.

imageRepository

private ImageRepository imageRepository

A repository of the ImagePeers used by this InstancePeer.

Constructor Detail

InstancePeer

InstancePeer(nextapp.echo.EchoInstance echoInstance,
             java.lang.String applicationUri)

Creates a new instance peer for the provided instance. Stores the application's URI for future use.

Parameters:

echoInstance - The EchoInstance object for which this peer is being created.

applicationUri - The URI of the application.

Method Detail

add

private void add(nextapp.echo.Component c,
                 boolean visibilityChange)

Registers the given component, and all visible components with visible parents beneath it. Adds a property change listener to any non-visible components that are the immediate children of any visible components that are being registered, so that if they become visible, this object will be notified.

Parameters:

c - The component to be added to the hierarchy.

visibilityChange - A flag indicating whether the component is being added because it changed visibility or not. If this flag is set, a property change listener won't be added to the component, because it already has one.

addConnection

void addConnection(Connection conn)

Adds an active connection to the internal list of connections.

Parameters:

conn - The Connection to be added.

childrenChange

private void childrenChange(java.beans.PropertyChangeEvent e)

Processes a property change event where a registered component has had children added or removed.

Parameters:

e - A property change event indicating that children have been added to or removed from a registered component.

clearTerminationUri

void clearTerminationUri()

Clears the termination URI. A termination URI is set if the application is exiting. The termination URI is the URI that the remaining open window will be directed to once the application has shut down and all of its other windows have been closed. A non-null termination URI indicates that the application SHOULD IMMEDIATELY EXIT to that URI. When the exit operation has been completed, the termination URI must be cleared such that if the application is again visited it will reinitialize instead of again redirecting to the termination URI.

exit

void exit(java.lang.String uri)

Exits the application, redirecting an available browser window to the specified URI.

Parameters:

uri - The URI to redirect the browser window to.

generateId

public Id generateId()

Generates a unique (to the application) identifier.

Returns:

An application-unique identifier.

getApplicationUri

java.lang.String getApplicationUri()

Returns the URI from which this application is available.

Returns:

The URI from which this application is available.

getCharacterEncoding

java.lang.String getCharacterEncoding()

Returns the character encoding that will be used when communicating with the client browser.

Returns:

The character encoding that will be used when communicating with the client browser.

getCacheIdPrefix

java.lang.String getCacheIdPrefix()

Returns a prefix to prepend to cache ids in order to ensure that incorrect cached resources are used by client in the event either the server or the users session has restarted.

Returns:

A prefix to prepend to cache ids to make them unique across server and session restarts.

getClientErrorService

Service getClientErrorService()

Returns the client error service for this user.

Returns:

The client error service for this user.

getClientInputProducers

java.util.Iterator getClientInputProducers()

Returns an iterator over all registered ClientInputProducerss.

Returns:

An iterator over all registered ClientInputProducerss.

getClientProperties

public ClientProperties getClientProperties()

Returns the "client properties" data collected about the client of this InstancePeer. This data contains information such as the browser name, version, and the clients screen resolution.

Returns:

The "client properties" data collected about the client of this InstancePeer.

getContainingPane

public PaneUI getContainingPane(ComponentPeer componentPeer)

Returns the PaneUI in which the given ComponentPeer is contained.

Parameters:

componentPeer - The ComponentPeer whose containing PaneUI is to be returned.

Returns:

The PaneUI containing the given ComponentPeer.

getContainingWindow

public WindowUI getContainingWindow(ComponentPeer componentPeer)

Returns the WindowUI in which the given ComponentPeer is contained.

Parameters:

componentPeer - The ComponentPeer whose containing WindowUI is to be returned.

Returns:

The WindowUI containing the given ComponentPeer.

getContentPanes

java.util.Iterator getContentPanes()

Returns an iterator over all registered content panes.

Returns:

An iterator over all registered content panes.

getController

public Service getController()

Returns this instance's Controller service.

Returns:

This instance's Controller service.

getCookieManager

public CookieManager getCookieManager()

Returns the CookieManager used by this instance.

Returns:

The CookieManager used by this instance.

getDefaultWindowId

Id getDefaultWindowId()

Returns the Id of the application's default window. This is the window that will occupy the original browser window the user typed the application's URI into. If the original default window has been closed, an arbitrary window id will be returned.

Returns:

The application's default window.

getErrorUri

java.lang.String getErrorUri()

Returns the URI the client is directed to in the event of an unrecoverable error.

Returns:

The URI the client is directed to in the event of an unrecoverable error.

getImageRepository

public ImageRepository getImageRepository()

Returns the image repository.

Returns:

The image repository.

getIncomingUpdateQueue

IncomingUpdateQueue getIncomingUpdateQueue()

Returns the application's incoming update queue.

Returns:

The application's incoming update queue.

getInstance

public nextapp.echo.EchoInstance getInstance()

Returns the EchoInstance object this peer supports.

Returns:

The EchoInstance object this peer supports.

getOutgoingUpdateQueue

OutgoingUpdateQueue getOutgoingUpdateQueue()

Returns the application's outgoing update queue.

Returns:

The application's outgoing update queue.

getPeer

public ComponentPeer getPeer(nextapp.echo.Component c)

Returns the ComponentPeer that corresponds to the given Component. A component will have a peer only if it has been registered. A component will be registered if all of its ancestors are visible, and the window that contains it is registered with this InstancePeer. If a peer cannot be found for the component, an EchoServletException (A RuntimeException) will be thrown.

Parameters:

c - The component whose peer is to be retrieved.

Returns:

The peer for the specified component.

getPeer

public ComponentPeer getPeer(Id id)

Returns the ComponentPeer that corresponds to the given Id. If a peer cannot be found which corresponds to the specified Id, a null value is returned.

Parameters:

id - The id of the peer to be retrieved.

Returns:

The peer identified by id.

getSafeInvokeService

public Service getSafeInvokeService()

Returns the service that renders the script containing the safeInvoke() method. The safeInvoke() method is used to execute script code which may generate errors. Different safeInvoke() implementations are used on different browsers based on the browser's support of JavaScript 1.4's try/catch/finally blocks.

Returns:

The service that renders the script containing the safeInvoke() method.

getSequenceNumber

int getSequenceNumber()

Returns the sequence number of the last successfully processed request from the client controller frame. The sequence number prevents the same request from being made multiple times, i.e., as the result of the user clicking the reload button in the browser.

Returns:

The sequence number of the last successfully processed request from the client controller frame.

getSession

javax.servlet.http.HttpSession getSession()

Returns the HttpSession object to which this instance peer is bound, or null if is not bound to a session.

Returns:

the HttpSession object to which this instance peer is bound.

getServiceRegistry

ServiceRegistry getServiceRegistry()

Returns the ServiceRegistry that is used by this instance to hold all Service objects available to it.

Returns:

This instance's ServiceRegistry.

getServletConfig

javax.servlet.ServletConfig getServletConfig()

Returns the ServletConfig object containing that the servlet container sent to the EchoServer's init() method (EchoServer extends HttpServlet). return The ServletConfig object for this Echo servlet.

getTerminationUri

java.lang.String getTerminationUri()

Returns null if the application does not desire to exit or a URI to direct the browser to if the application does desire to exit. This method is called by the Controller every time it receives a service request. If a URI is provided, the Controller will terminate the client session and redirect the browser.

Returns:

The termination URI.

getUserPrincipal

public java.security.Principal getUserPrincipal()

Returns the principal (user) of this application. This method provides the identical capability of HttpServletRequest.getUserPrincipal().

Returns:

The principal (user) of this application.

getVariableData

VariableData getVariableData()

Returns the VariableData object used by this instance peer when rendering templated services.

Returns:

The VariableData object used by this instance peer.

getWindows

java.util.Iterator getWindows()

Returns an iterator of all registered windows.

Returns:

An iterator of all registered windows.

hasPeer

private boolean hasPeer(nextapp.echo.Component c)

Determines whether the specified component has a peer.

Parameters:

c - The component to analyze.

Returns:

True if the component has a peer.

incrementSequenceNumber

void incrementSequenceNumber()

Increments the value of the controller frame sequence number by one. This method is called by the controller after a successful request.

See Also:

getSequenceNumber()

init

void init()

Initializes this InstancePeer, causing the represented EchoInstance to also initialize. The default window is obtained from the EchoInstance.init() method and added to the application.

isExiting

boolean isExiting()

Returns true if the application is exiting and should have therefore have its session invalidated. This method will be called by the controller which will remove the InstancePeer from the session.

Returns:

True if the application is exiting.

isUserInRole

boolean isUserInRole(java.lang.String role)

Returns true if the user of the application is in the specified role. This method provides the identical capability of HttpServletRequest.isUserInRole().

Parameters:

role - The role for which to test membership.

Returns:

True if the user is in the specified role.

lowerWindow

void lowerWindow(WindowUI windowUI)

Lowers the specified window to the background.

Parameters:

windowUI - The window to lower.

propertyChange

public void propertyChange(java.beans.PropertyChangeEvent e)

Handler for PropertyChangeEvents. This class registers with all registered components and their immediately non-visible siblings to receive property changes. The InstancePeer needs to monitor all changes in its represented EchoInstance and its components such that it can update the client browser to reflect the application's state.

Specified by:

propertyChange in interface java.beans.PropertyChangeListener

Parameters:

e - A property change event describing a property change to the application represented by this peer or one of its components.

raiseWindow

void raiseWindow(WindowUI windowUI)

Raises the specified window to the foreground.

Parameters:

windowUI - The window to raise.

redraw

public void redraw(ComponentPeer componentPeer)

Causes the service containing the given component to be re-rendered.

Parameters:

componentPeer - A ComponentPeer whose represented Component has changed and therefore needs to be updated on the client browser.

register

private void register(nextapp.echo.Component c)

Registers a component. Components are registered using the following procedure:

1. A peer is created for the component.
2. The peer is sored in the InstancePeer's Id-to-ComponentPeer and Component-to-ComponentPeer mappings.
3. If the peer is a service, it is added to the service registry.
4. If the peer has any ancillary services, they are added to the service registry.
5. If the peer produces client actions (by implementing ClientActionProducer, then it is added to this instance's inventory of action producing components.
6. If the peer produces client input (by implementing ClientInputProducer, then it is added to this instance's inventory of input producing components.
7. The component is notified of its registration by having its registered()method invoked.

Parameters:

c - The component to be registered.

remove

private void remove(nextapp.echo.Component c,
                    boolean visibilityChange)

Recursively removes a component and its descendants from the InstancePeer by unregistering their peer objects and removing the InstancePeer from their lists of property change listeners. If the reason for removal is that the component has become invisible, the property change listener on the component being removed will remain such that the InstancePeer will be notified if/when it again becomes visible.

Parameters:

c - The component to be removed from the hierarchy.

visibilityChange - A flag indicating whether the component is being removed because it changed visibility or not. If this flag is set, a property change listener will be kept on the component such that it can be re-added if it becomes visible again.

removeConnection

void removeConnection(Connection conn)

Removes an active connection from the internal list of connections.

Parameters:

conn - The Connection to be removed.

restart

void restart()

Restarts application by suspending to applciation's own URI.

setCharacterEncoding

void setCharacterEncoding(java.lang.String newValue)

Returns the character encoding that will be used when communicating with the client browser.

Parameters:

newValue - The character encoding that will be used when communicating with the client browser.

setClientProperties

void setClientProperties(ClientProperties clientProperties)

Sets the client properties for the user.

Parameters:

clientProperties - The client properties data to associate with this instance.

setErrorUri

void setErrorUri(java.lang.String errorUri)

Sets the URI the client is directed to in the event of an unrecoverable error.

Parameters:

errorUri - The new error URI.

setTitle

public void setTitle(WindowUI windowUI)

Causes the specified window's title to be updated on the client.

Parameters:

windowUI - The peer of the window whose title should be redrawn.

setUserPrincipal

void setUserPrincipal(java.security.Principal userPrincipal)

Sets the principal (user) that is using the application.

Parameters:

userPrincipal - The principal (user) that is using the application.

suspend

void suspend(java.lang.String uri)

Suspends the application, redirecting an available browser window to the specified URI.

Parameters:

uri - The URI to redirect the browser.

unregister

private void unregister(nextapp.echo.Component c)

Unregisters a component.

Parameters:

c - The component to be unregistered.

updateLocalizedResources

private void updateLocalizedResources()

Updates localized resources.

valueBound

public void valueBound(javax.servlet.http.HttpSessionBindingEvent e)

Listener implementation of HttpSessionBindingListener. Stores reference to session when invoked.

Specified by:

valueBound in interface javax.servlet.http.HttpSessionBindingListener

See Also:

HttpSessionBindingListener.valueBound(HttpSessionBindingEvent)

valueUnbound

public void valueUnbound(javax.servlet.http.HttpSessionBindingEvent e)

Listener implementation of Mcode>HttpSessionBindingListener. Removes reference to session when invoked.

Specified by:

valueUnbound in interface javax.servlet.http.HttpSessionBindingListener

See Also:

HttpSessionBindingListener.valueUnbound(HttpSessionBindingEvent)

visibilityChange

private void visibilityChange(java.beans.PropertyChangeEvent e)

Handles the case where a registered component or immediate invisible descendent of a registered component has changed visibility. A @param e property change event from a component that whose visibility has changed.