PortletSession (Java Portlet Specification V2.0 1.0 API)

```
public interface PortletSession
```
The PortletSession interface provides a way to identify a user across more than one request and to store transient information about that user.
A PortletSession is created per user client per portlet application.
A portlet can bind an object attribute into a PortletSession by name. The PortletSession interface defines two scopes for storing objects:
- APPLICATION_SCOPE
- PORTLET_SCOPE
All objects stored in the session using the APPLICATION_SCOPE must be available to all the portlets, servlets and JSPs that belongs to the same portlet application and that handles a request identified as being a part of the same session. Objects stored in the session using the PORTLET_SCOPE must be available to the portlet during requests for the same portlet window that the objects where stored from. Attributes stored in the PORTLET_SCOPE are not protected from other web components of the portlet application. They are just conveniently namespaced.
The portlet session is based on the HttpSession. Therefore all HttpSession listeners do apply to the portlet session and attributes set in the portlet session are visible in the HttpSession and vice versa.

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`APPLICATION_SCOPE` This constant defines an application wide scope for the session attribute.
`static int`	`PORTLET_SCOPE` This constant defines the scope of the session attribute to be private to the portlet and its included resources.

Method Summary

Methods
Modifier and Type	Method and Description
`Object`	`getAttribute(String name)` Returns the object bound with the specified name in this session under the `PORTLET_SCOPE`, or `null` if no object is bound under the name in that scope.
`Object`	`getAttribute(String name, int scope)` Returns the object bound with the specified name in this session, or `null` if no object is bound under the name in the given scope.
`Map<String,Object>`	`getAttributeMap()` Returns a `Map` of the session attributes in the portlet session scope.
`Map<String,Object>`	`getAttributeMap(int scope)` Returns a `Map` of the session attributes in the given session scope.
`Enumeration<String>`	`getAttributeNames()` Returns an `Enumeration` of String objects containing the names of all the objects bound to this session under the `PORTLET_SCOPE`, or an empty `Enumeration` if no attributes are available.
`Enumeration<String>`	`getAttributeNames(int scope)` Returns an `Enumeration` of String objects containing the names of all the objects bound to this session in the given scope, or an empty `Enumeration` if no attributes are available in the given scope.
`long`	`getCreationTime()` Returns the time when this session was created, measured in milliseconds since midnight January 1, 1970 GMT.
`String`	`getId()` Returns a string containing the unique identifier assigned to this session.
`long`	`getLastAccessedTime()` Returns the last time the client sent a request associated with this session, as the number of milliseconds since midnight January 1, 1970 GMT.
`int`	`getMaxInactiveInterval()` Returns the maximum time interval, in seconds, for which the portlet container keeps this session open between client accesses.
`PortletContext`	`getPortletContext()` Returns the portlet application context associated with this session.
`void`	`invalidate()` Invalidates this session (all scopes) and unbinds any objects bound to it.
`boolean`	`isNew()` Returns true if the client does not yet know about the session or if the client chooses not to join the session.
`void`	`removeAttribute(String name)` Removes the object bound with the specified name under the `PORTLET_SCOPE` from this session.
`void`	`removeAttribute(String name, int scope)` Removes the object bound with the specified name and the given scope from this session.
`void`	`setAttribute(String name, Object value)` Binds an object to this session under the `PORTLET_SCOPE`, using the name specified.
`void`	`setAttribute(String name, Object value, int scope)` Binds an object to this session in the given scope, using the name specified.
`void`	`setMaxInactiveInterval(int interval)` Specifies the time, in seconds, between client requests, before the portlet container invalidates this session.

- Field Detail
  - APPLICATION_SCOPE
```
static final int APPLICATION_SCOPE
```
    This constant defines an application wide scope for the session attribute. APPLICATION_SCOPE session attributes enable Portlets within one portlet application to share data.
    Portlets may need to prefix attributes set in this scope with some ID, to avoid overwriting each other's attributes in the case where two portlets of the same portlet definition are created.
    Value: 0x01
    
    See Also:
    Constant Field Values
  - PORTLET_SCOPE
```
static final int PORTLET_SCOPE
```
    This constant defines the scope of the session attribute to be private to the portlet and its included resources.
    Value: 0x02
    
    See Also:
    Constant Field Values
- Method Detail
  - getAttribute
```
Object getAttribute(String name)
```
    Returns the object bound with the specified name in this session under the PORTLET_SCOPE, or null if no object is bound under the name in that scope.
    
    Parameters:
    name - a string specifying the name of the object
    
    Returns:
    the object with the specified name for the PORTLET_SCOPE.
    
    Throws:
    
    IllegalStateException - if this method is called on an invalidated session.
    
    IllegalArgumentException - if name is null.
  - getAttribute
```
Object getAttribute(String name,
                  int scope)
```
    Returns the object bound with the specified name in this session, or null if no object is bound under the name in the given scope.
    
    Parameters:
    name - a string specifying the name of the object
    scope - session scope of this attribute
    
    Returns:
    the object with the specified name
    
    Throws:
    
    IllegalStateException - if this method is called on an invalidated session, or the scope is unknown to the container.
    
    IllegalArgumentException - if name is null.
  - getAttributeNames
```
Enumeration<String> getAttributeNames()
```
    Returns an Enumeration of String objects containing the names of all the objects bound to this session under the PORTLET_SCOPE, or an empty Enumeration if no attributes are available.
    
    Returns:
    an Enumeration of String objects specifying the names of all the objects bound to this session, or an empty Enumeration if no attributes are available.
    
    Throws:
    
    IllegalStateException - if this method is called on an invalidated session
  - getAttributeNames
```
Enumeration<String> getAttributeNames(int scope)
```
    Returns an Enumeration of String objects containing the names of all the objects bound to this session in the given scope, or an empty Enumeration if no attributes are available in the given scope.
    
    Parameters:
    scope - session scope of the attribute names
    
    Returns:
    an Enumeration of String objects specifying the names of all the objects bound to this session, or an empty Enumeration if no attributes are available in the given scope.
    
    Throws:
    
    IllegalStateException - if this method is called on an invalidated session, or the scope is unknown to the container.
  - getCreationTime
```
long getCreationTime()
```
    Returns the time when this session was created, measured in milliseconds since midnight January 1, 1970 GMT.
    
    Returns:
    a long specifying when this session was created, expressed in milliseconds since 1/1/1970 GMT
    
    Throws:
    
    IllegalStateException - if this method is called on an invalidated session
  - getId
```
String getId()
```
    Returns a string containing the unique identifier assigned to this session.
    
    Returns:
    a string specifying the identifier assigned to this session
  - getLastAccessedTime
```
long getLastAccessedTime()
```
    Returns the last time the client sent a request associated with this session, as the number of milliseconds since midnight January 1, 1970 GMT.
    Actions that your portlet takes, such as getting or setting a value associated with the session, do not affect the access time.
    
    Returns:
    a long representing the last time the client sent a request associated with this session, expressed in milliseconds since 1/1/1970 GMT
  - getMaxInactiveInterval
```
int getMaxInactiveInterval()
```
    Returns the maximum time interval, in seconds, for which the portlet container keeps this session open between client accesses. After this interval, the portlet container invalidates the session. The maximum time interval can be set with the setMaxInactiveInterval method. A negative time indicates the session should never timeout.
    
    Returns:
    an integer specifying the number of seconds this session remains open between client requests
    See Also:
    setMaxInactiveInterval(int)
  - invalidate
```
void invalidate()
```
    Invalidates this session (all scopes) and unbinds any objects bound to it.
    Invalidating the portlet session will result in invalidating the underlying HttpSession
    
    Throws:
    
    IllegalStateException - if this method is called on a session which has already been invalidated
  - isNew
```
boolean isNew()
```
    Returns true if the client does not yet know about the session or if the client chooses not to join the session.
    
    Returns:
    true if the server has created a session, but the client has not joined yet.
    
    Throws:
    
    IllegalStateException - if this method is called on a session which has already been invalidated
  - removeAttribute
```
void removeAttribute(String name)
```
    Removes the object bound with the specified name under the PORTLET_SCOPE from this session. If the session does not have an object bound with the specified name, this method does nothing.
    
    Parameters:
    name - the name of the object to be removed from this session in the PORTLET_SCOPE.
    
    Throws:
    
    IllegalStateException - if this method is called on a session which has been invalidated
    
    IllegalArgumentException - if name is null.
  - removeAttribute
```
void removeAttribute(String name,
                   int scope)
```
    Removes the object bound with the specified name and the given scope from this session. If the session does not have an object bound with the specified name, this method does nothing.
    
    Parameters:
    name - the name of the object to be removed from this session
    scope - session scope of this attribute
    
    Throws:
    
    IllegalStateException - if this method is called on a session which has been invalidated
    
    IllegalArgumentException - if name is null.
  - setAttribute
```
void setAttribute(String name,
                Object value)
```
    Binds an object to this session under the PORTLET_SCOPE, using the name specified. If an object of the same name in this scope is already bound to the session, that object is replaced.
    After this method has been executed, and if the new object implements HttpSessionBindingListener, the container calls HttpSessionBindingListener.valueBound. The container then notifies any HttpSessionAttributeListeners in the web application.
    If an object was already bound to this session that implements HttpSessionBindingListener, its HttpSessionBindingListener.valueUnbound method is called.
    If the value is null, this has the same effect as calling removeAttribute().
    
    Parameters:
    name - the name to which the object is bound under the PORTLET_SCOPE; this cannot be null.
    value - the object to be bound
    
    Throws:
    
    IllegalStateException - if this method is called on a session which has been invalidated
    
    IllegalArgumentException - if name is null.
  - setAttribute
```
void setAttribute(String name,
                Object value,
                int scope)
```
    Binds an object to this session in the given scope, using the name specified. If an object of the same name in this scope is already bound to the session, that object is replaced.
    After this method has been executed, and if the new object implements HttpSessionBindingListener, the container calls HttpSessionBindingListener.valueBound. The container then notifies any HttpSessionAttributeListeners in the web application.
    If an object was already bound to this session that implements HttpSessionBindingListener, its HttpSessionBindingListener.valueUnbound method is called.
    If the value is null, this has the same effect as calling removeAttribute().
    
    Parameters:
    name - the name to which the object is bound; this cannot be null.
    value - the object to be bound
    scope - session scope of this attribute
    
    Throws:
    
    IllegalStateException - if this method is called on a session which has been invalidated
    
    IllegalArgumentException - if name is null or scope is unknown to the container.
  - setMaxInactiveInterval
```
void setMaxInactiveInterval(int interval)
```
    Specifies the time, in seconds, between client requests, before the portlet container invalidates this session. A negative time indicates the session should never timeout.
    
    Parameters:
    interval - An integer specifying the number of seconds
  - getPortletContext
```
PortletContext getPortletContext()
```
    Returns the portlet application context associated with this session.
    
    Returns:
    the portlet application context
  - getAttributeMap
```
Map<String,Object> getAttributeMap()
```
    Returns a Map of the session attributes in the portlet session scope.
    The keys are of type String and the values in the returned Map are from type Object.
    If no session attributes exist this method returns an empty Map.
    
    Returns:
    an immutable Map containing the session attributes in the portlet session scope as keys and attribute values as map values, or an empty Map if no session attributes exist. The keys in the map are of type String, the values of type Object.
    Since:
    
    2.0
  - getAttributeMap
```
Map<String,Object> getAttributeMap(int scope)
```
    Returns a Map of the session attributes in the given session scope.
    The keys are of type String and the values in the returned Map are from type Object.
    If no session attributes exist this method returns an empty Map.
    
    Parameters:
    scope - session scope of this attribute
    
    Returns:
    an immutable Map containing the session attributes in the given scope as keys and attribute values as map values, or an empty Map if no session attributes exist. The keys in the map are of type String, the values of type Object.
    Since:
    
    2.0

Interface PortletSession

Field Summary

Method Summary

Field Detail

APPLICATION_SCOPE

PORTLET_SCOPE

Method Detail

getAttribute

getAttribute

getAttributeNames

getAttributeNames

getCreationTime

getId

getLastAccessedTime

getMaxInactiveInterval

invalidate

isNew

removeAttribute

removeAttribute

setAttribute

setAttribute

setMaxInactiveInterval

getPortletContext

getAttributeMap

getAttributeMap