Session (Wicket Core 7.2.0 API)

java.lang.Object
- org.apache.wicket.Session

All Implemented Interfaces:

Serializable, IEventSink, IClusterable

Direct Known Subclasses:

WebSession
```
public abstract class Session
extends Object
implements IClusterable, IEventSink
```
Holds information about a user session, including some fixed number of most recent pages (and all their nested component information).
- Access - the Session can be retrieved either by Component.getSession() or by directly calling the static method Session.get(). All classes which extend directly or indirectly WebMarkupContainer can also use its convenience method WebMarkupContainer.getWebSession()
- Locale - A session has a Locale property to support localization. The Locale for a session can be set by calling setLocale(Locale). The Locale for a Session determines how localized resources are found and loaded.
- Style - Besides having an appearance based on locale, resources can also have different looks in the same locale (a.k.a. "skins"). The style for a session determines the look which is used within the appropriate locale. The session style ("skin") can be set with the setStyle() method.
- Resource Loading - Based on the Session locale and style, searching for resources occurs in the following order (where sourcePath is set via the ApplicationSettings object for the current Application, and style and locale are Session properties):
- Session Properties - Arbitrary objects can be attached to a Session by installing a session factory on your Application class which creates custom Session subclasses that have typesafe properties specific to the application (see Application for details). To discourage non-typesafe access to Session properties, no setProperty() or getProperty() method is provided. In a clustered environment, you should take care to call the dirty() method when you change a property on your own. This way the session will be reset again in the http session so that the http session knows the session is changed.
- Class Resolver - Sessions have a class resolver ( IClassResolver) implementation that is used to locate classes for components such as pages.
- Page Factory - A pluggable implementation of IPageFactory is used to instantiate pages for the session.
- Removal - Pages can be removed from the Session forcibly by calling clear(), although such an action should rarely be necessary.
- Flash Messages - Flash messages are messages that are stored in session and are removed after they are displayed to the user. Session acts as a store for these messages because they can last across requests.
Author:

Jonathan Locke, Eelco Hillenius, Igor Vaynberg (ivaynberg)

See Also:
Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`protected ClientInfo`	`clientInfo` Cached instance of agent info which is typically designated by calling `getClientInfo()`.
`static String`	`SESSION_ATTRIBUTE_NAME` Name of session attribute under which this session is stored

Constructor Summary

Constructors
Constructor and Description

Session(Request request)
Constructor.

Constructors
Constructor and Description
`Session(Request request)` Constructor.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`bind()` Force binding this session to the application's `session store` if not already done so.
`void`	`clear()` Removes all pages from the session.
`void`	`debug(Serializable message)` Registers an debug feedback message for this session
`void`	`detach()` Any detach logic for session subclasses.
`void`	`dirty()` Marks session state as dirty so that it will be (re)stored in the ISessionStore at the end of the request.
`void`	`dirty(boolean forced)` Marks session state as dirty so that it will be re-stored in the ISessionStore at the end of the request.
`void`	`error(Serializable message)` Registers an error feedback message for this session
`static boolean`	`exists()` Checks existence of a `Session` associated with the current thread.
`void`	`fatal(Serializable message)` Registers an fatal feedback message for this session
`static Session`	`get()` Returns session associated to current thread.
`Application`	`getApplication()` Get the application that is currently working with this session.
`Serializable`	`getAttribute(String name)` Gets the attribute value with the given name
`List<String>`	`getAttributeNames()`
`IAuthorizationStrategy`	`getAuthorizationStrategy()`
`IClassResolver`	`getClassResolver()`
`abstract ClientInfo`	`getClientInfo()` Gets the client info object for this session.
`FeedbackMessages`	`getFeedbackMessages()` Gets feedback messages stored in session
`String`	`getId()` Gets the unique id for this session from the underlying SessionStore.
`Locale`	`getLocale()` Get this session's locale.
`<M extends Serializable> M`	`getMetaData(MetaDataKey<M> key)` Gets metadata for this session using the given key.
`IPageFactory`	`getPageFactory()`
`IPageManager`	`getPageManager()` Returns the `IPageManager` instance.
`protected ISessionStore`	`getSessionStore()` Gets the session store.
`long`	`getSizeInBytes()`
`String`	`getStyle()` Get the style (see `Session`).
`void`	`info(Serializable message)` Registers an informational feedback message for this session
`void`	`internalDetach()` NOT PART OF PUBLIC API, DO NOT CALL Detaches internal state of `Session`
`void`	`invalidate()` Invalidates this session at the end of the current request.
`void`	`invalidateNow()` Invalidates this session immediately.
`boolean`	`isSessionInvalidated()` Whether the session is invalid now, or will be invalidated by the end of the request.
`boolean`	`isTemporary()` Whether this session is temporary.
`protected PageAccessSynchronizer`	`newPageAccessSynchronizer(Duration timeout)` Factory method for PageAccessSynchronizer instances
`int`	`nextPageId()`
`int`	`nextSequenceValue()` Retrieves the next available session-unique value
`void`	`onEvent(IEvent<?> event)` Called when an event is sent to this sink
`void`	`onInvalidate()` A callback method that is executed when the user session is invalidated either by explicit call to `invalidate()` or due to HttpSession expiration.
`void`	`removeAttribute(String name)` Removes the attribute with the given name.
`void`	`replaceSession()` Replaces the underlying (Web)Session, invalidating the current one and creating a new one.
`Session`	`setAttribute(String name, Serializable value)` Adds or replaces the attribute with the given name and value.
`Session`	`setClientInfo(ClientInfo clientInfo)` THIS METHOD IS NOT PART OF THE WICKET PUBLIC API.
`Session`	`setLocale(Locale locale)` Set the locale for this session.
`<M extends Serializable> Session`	`setMetaData(MetaDataKey<M> key, M object)` Sets the metadata for this session using the given key.
`Session`	`setStyle(String style)` Set the style (see `Session`).
`void`	`success(Serializable message)` Registers an success feedback message for this session
`void`	`warn(Serializable message)` Registers a warning feedback message for this session

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - SESSION_ATTRIBUTE_NAME
```
public static final String SESSION_ATTRIBUTE_NAME
```
    Name of session attribute under which this session is stored
    
    See Also:
    Constant Field Values
  - clientInfo
```
protected ClientInfo clientInfo
```
    Cached instance of agent info which is typically designated by calling getClientInfo().
- Constructor Detail
  - Session
```
public Session(Request request)
```
    Constructor. Note that RequestCycle is not available until this constructor returns.
    
    Parameters:
    request - The current request
- Method Detail
  - exists
```
public static boolean exists()
```
    Checks existence of a Session associated with the current thread.
    
    Returns:
    true if get() can return the instance of session, false otherwise
  - get
```
public static Session get()
```
    Returns session associated to current thread. Always returns a session during a request cycle, even though the session might be temporary
    
    Returns:
    session.
  - bind
```
public final void bind()
```
    Force binding this session to the application's session store if not already done so.
    A Wicket application can operate in a session-less mode as long as stateless pages are used. Session objects will be then created for each request, but they will only live for that request. You can recognize temporary sessions by calling isTemporary() which basically checks whether the session's id is null. Hence, temporary sessions have no session id.
    
    By calling this method, the session will be bound (made not-temporary) if it was not bound yet. It is useful for cases where you want to be absolutely sure this session object will be available in next requests. If the session was already bound ( returns a session), this call will be a noop.
  - clear
```
public final void clear()
```
    Removes all pages from the session. Although this method should rarely be needed, it is available (possibly for security reasons).
  - error
```
public final void error(Serializable message)
```
    Registers an error feedback message for this session
    
    Parameters:
    message - The feedback message
  - fatal
```
public final void fatal(Serializable message)
```
    Registers an fatal feedback message for this session
    
    Parameters:
    message - The feedback message
  - debug
```
public final void debug(Serializable message)
```
    Registers an debug feedback message for this session
    
    Parameters:
    message - The feedback message
  - getApplication
```
public final Application getApplication()
```
    Get the application that is currently working with this session.
    
    Returns:
    Returns the application.
  - getAuthorizationStrategy
```
public IAuthorizationStrategy getAuthorizationStrategy()
```
    Returns:
    The authorization strategy for this session
  - getClassResolver
```
public final IClassResolver getClassResolver()
```
    Returns:
    The class resolver for this Session
  - getClientInfo
```
public abstract ClientInfo getClientInfo()
```
    Gets the client info object for this session. This method lazily gets the new agent info object for this session. It uses any cached or set (setClientInfo(ClientInfo)) client info object.
    
    Returns:
    the client info object based on this request
  - getFeedbackMessages
```
public final FeedbackMessages getFeedbackMessages()
```
    Gets feedback messages stored in session
    
    Returns:
    unmodifiable list of feedback messages
  - getId
```
public final String getId()
```
    Gets the unique id for this session from the underlying SessionStore. May be null if a concrete session is not yet created.
    
    Returns:
    The unique id for this session or null if it is a temporary session
  - getLocale
```
public Locale getLocale()
```
    Get this session's locale.
    
    Returns:
    This session's locale
  - getMetaData
```
public final <M extends Serializable> M getMetaData(MetaDataKey<M> key)
```
    Gets metadata for this session using the given key.
    
    Type Parameters:
    M - The type of the metadata.
    Parameters:
    key - The key for the data
    
    Returns:
    The metadata
    See Also:
    MetaDataKey
  - getPageFactory
```
public IPageFactory getPageFactory()
```
    Returns:
    The page factory for this session
  - getSizeInBytes
```
public final long getSizeInBytes()
```
    Returns:
    Size of this session
  - getStyle
```
public final String getStyle()
```
    Get the style (see Session).
    
    Returns:
    Returns the style (see Session)
  - info
```
public final void info(Serializable message)
```
    Registers an informational feedback message for this session
    
    Parameters:
    message - The feedback message
  - success
```
public final void success(Serializable message)
```
    Registers an success feedback message for this session
    
    Parameters:
    message - The feedback message
  - invalidate
```
public void invalidate()
```
    Invalidates this session at the end of the current request. If you need to invalidate the session immediately, you can do this by calling invalidateNow(), however this will remove all Wicket components from this session, which means that you will no longer be able to work with them.
  - invalidateNow
```
public void invalidateNow()
```
    Invalidates this session immediately. Calling this method will remove all Wicket components from this session, which means that you will no longer be able to work with them.
  - replaceSession
```
public void replaceSession()
```
    Replaces the underlying (Web)Session, invalidating the current one and creating a new one. By calling ISessionStore.invalidate(Request) and bind()
    Call upon login to protect against session fixation.
    
    See Also:
    "http://www.owasp.org/index.php/Session_Fixation"
  - isSessionInvalidated
```
public final boolean isSessionInvalidated()
```
    Whether the session is invalid now, or will be invalidated by the end of the request. Clients should rarely need to use this method if ever.
    
    Returns:
    Whether the session is invalid when the current request is done
    See Also:
    invalidate(), invalidateNow()
  - isTemporary
```
public final boolean isTemporary()
```
    Whether this session is temporary. A Wicket application can operate in a session-less mode as long as stateless pages are used. If this session object is temporary, it will not be available on a next request.
    
    Returns:
    Whether this session is temporary (which is the same as it's id being null)
  - setClientInfo
```
public final Session setClientInfo(ClientInfo clientInfo)
```
    THIS METHOD IS NOT PART OF THE WICKET PUBLIC API. DO NOT CALL IT.
    Sets the client info object for this session. This will only work when getClientInfo() is not overridden.
    
    Parameters:
    clientInfo - the client info object
  - setLocale
```
public Session setLocale(Locale locale)
```
    Set the locale for this session.
    
    Parameters:
    locale - New locale
  - setMetaData
```
public final <M extends Serializable> Session setMetaData(MetaDataKey<M> key,
                                           M object)
```
    Sets the metadata for this session using the given key. If the metadata object is not of the correct type for the metadata key, an IllegalArgumentException will be thrown. For information on creating MetaDataKeys, see MetaDataKey.
    
    Parameters:
    key - The singleton key for the metadata
    object - The metadata object
    
    Throws:
    
    IllegalArgumentException
    See Also:
    MetaDataKey
  - setStyle
```
public final Session setStyle(String style)
```
    Set the style (see Session).
    
    Parameters:
    style - The style to set.
    
    Returns:
    the Session object
  - warn
```
public final void warn(Serializable message)
```
    Registers a warning feedback message for this session
    
    Parameters:
    message - The feedback message
  - detach
```
public void detach()
```
    Any detach logic for session subclasses. This is called on the end of handling a request, when the RequestCycle is about to be detached from the current thread.
  - internalDetach
```
public void internalDetach()
```
    NOT PART OF PUBLIC API, DO NOT CALL Detaches internal state of Session
  - dirty
```
public final void dirty()
```
    Marks session state as dirty so that it will be (re)stored in the ISessionStore at the end of the request. Note: binds the session if it is temporary
  - dirty
```
public final void dirty(boolean forced)
```
    Marks session state as dirty so that it will be re-stored in the ISessionStore at the end of the request.
    
    Parameters:
    forced - A flag indicating whether the session should be marked as dirty even when it is temporary. If true the Session will be bound.
  - getAttribute
```
public final Serializable getAttribute(String name)
```
    Gets the attribute value with the given name
    
    Parameters:
    name - The name of the attribute to store
    
    Returns:
    The value of the attribute
  - getAttributeNames
```
public final List<String> getAttributeNames()
```
    Returns:
    List of attributes for this session
  - getSessionStore
```
protected ISessionStore getSessionStore()
```
    Gets the session store.
    
    Returns:
    the session store
  - removeAttribute
```
public final void removeAttribute(String name)
```
    Removes the attribute with the given name.
    
    Parameters:
    name - the name of the attribute to remove
  - setAttribute
```
public final Session setAttribute(String name,
                   Serializable value)
```
    Adds or replaces the attribute with the given name and value.
    
    Parameters:
    name - The name of the attribute
    value - The value of the attribute
  - nextSequenceValue
```
public int nextSequenceValue()
```
    Retrieves the next available session-unique value
    
    Returns:
    session-unique value
  - nextPageId
```
public int nextPageId()
```
    Returns:
    the next page id
  - getPageManager
```
public final IPageManager getPageManager()
```
    Returns the IPageManager instance.
    
    Returns:
    IPageManager instance.
  - onEvent
```
public void onEvent(IEvent<?> event)
```
    Called when an event is sent to this sink
    
    Specified by:
    
    onEvent in interface IEventSink
  - onInvalidate
```
public void onInvalidate()
```
    A callback method that is executed when the user session is invalidated either by explicit call to invalidate() or due to HttpSession expiration.
    In case of session expiration this method is called in a non-worker thread, i.e. there are no thread locals exported for the Application, RequestCycle and Session. The Session is the current instance. The Application can be found by using Application.get(String). There is no way to get a reference to a RequestCycle
  - newPageAccessSynchronizer
```
protected PageAccessSynchronizer newPageAccessSynchronizer(Duration timeout)
```
    Factory method for PageAccessSynchronizer instances
    
    Parameters:
    timeout - The configured timeout. See RequestCycleSettings.getTimeout()
    
    Returns:
    A new instance of PageAccessSynchronizer

Class Session

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

SESSION_ATTRIBUTE_NAME

clientInfo

Constructor Detail

Session

Method Detail

exists

get

bind

clear

error

fatal

debug

getApplication

getAuthorizationStrategy

getClassResolver

getClientInfo

getFeedbackMessages

getId

getLocale

getMetaData

getPageFactory

getSizeInBytes

getStyle

info

success

invalidate

invalidateNow

replaceSession

isSessionInvalidated

isTemporary

setClientInfo

setLocale

setMetaData

setStyle

warn

detach

internalDetach

dirty

dirty

getAttribute

getAttributeNames

getSessionStore

removeAttribute

setAttribute

nextSequenceValue

nextPageId

getPageManager

onEvent

onInvalidate

newPageAccessSynchronizer