atg.nucleus

Class RequestScopeManager

java.lang.Object

atg.nucleus.logging.VariableArgumentApplicationLoggingImpl

atg.nucleus.GenericService

atg.nucleus.GenericContext

atg.nucleus.RequestScopeManager

All Implemented Interfaces:

atg.core.logging.Logging, atg.core.logging.TraceLogging, atg.naming.AbsoluteNameable, NameContext, NameContextBindingEventSource, NameContextBindingListener, atg.naming.NameContextCreator, NameContextElement, atg.naming.NameContextParentable, atg.naming.NameContextPreBindingEventSource, NameResolver, AdminableService, atg.nucleus.ConfigurationLockRegistry, atg.nucleus.Configured, ApplicationLogging, atg.nucleus.logging.ApplicationLoggingSender, atg.nucleus.logging.TraceApplicationLogging, VariableArgumentApplicationLogging, ComponentNameResolver, atg.nucleus.ScopeManager, Service, ServiceListener, Schedulable, java.util.EventListener, javax.servlet.ServletContext

public class RequestScopeManager
extends GenericContext
implements Schedulable, atg.nucleus.ScopeManager

A RequestScopeManager manages a set of hierarchies that are meant to hold "request-scoped" objects. Each hierarchy is associated with a key. One can ask for the hierarchy corresponding to a specified key, which will return or create the Context at the top of that hierarchy.

In normal use, a server will spin off a number of threads that will handle requests. Those threads will each have a request object which is used as the key for its request scope.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	RequestScopeManager.RequestScopeGenericContext We extend GenericContext2 to keep a weak reference to the current session.

Nested classes/interfaces inherited from class atg.nucleus.GenericContext

GenericContext.ConcurrencyModel

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	CLASS_VERSION Class version string
java.lang.String	REQUEST_SCOPE_PREFIX The prefix for request scope names...

Fields inherited from class atg.nucleus.GenericService

SERVICE_INFO_KEY

Fields inherited from interface atg.nucleus.logging.TraceApplicationLogging

DEFAULT_LOG_TRACE_STATUS

Fields inherited from interface atg.nucleus.logging.ApplicationLogging

DEFAULT_LOG_DEBUG_STATUS, DEFAULT_LOG_ERROR_STATUS, DEFAULT_LOG_INFO_STATUS, DEFAULT_LOG_WARNING_STATUS

Constructor Summary

Constructors

Constructor and Description
RequestScopeManager() Constructs a new blank RequestScopeManager

Method Summary

Modifier and Type	Method and Description
boolean	canReferenceOtherScope(atg.nucleus.ScopeManager pScopeManager)
void	doStartService() This is called after a Service has been created, placed into the naming hierarchy, and initialized with its configured property values.
void	doStopService() This is called when a Service is required to shut down.
int	generateId() Generates a new id and returns it.
GenericContext	getContext(java.lang.Object pKey) Deprecated.
GenericContext	getContext(java.lang.Object pKey, int pId) Returns the GenericContext for the given Key and id
Schedule	getLostRequestScopeSchedule()
java.lang.String	getManagedScopeName()
int	getNumSavedRequestScopes() Read-only property which returns the number of request scopes that we are currently holding onto for pending redirects.
int	getRequestScopeExpirationMilliseconds()
NameContext	getRootContextForRequest(DynamoHttpServletRequest pRequest) Get the root reqwuest scope for the specified request.
GenericContext	getSavedRequestScope(java.lang.Object pKey, int pId, java.lang.String pSessionId) Returns the saved request scope, while also removing it from the saved store.
boolean	getSaveRequestScopeOnRedirect()
Scheduler	getScheduler() Returns the Scheduler used to run the expiration and swapping checks.
boolean	isInheritsEffectiveScope()
void	performScheduledTask(Scheduler pScheduler, ScheduledJob pJob) This is called once for the minimum timeout specified by save requestScope.
int	readId()
boolean	removeContext(java.lang.Object pKey) Removes the request context object stored for the key specified
int	saveRequestScope(java.lang.Object pKey, java.lang.String pSessionId) Save a request scope, returning an integer id with which this request scope can later be reclaimed.
void	setLostRequestScopeSchedule(Schedule pLostRequestScopeSchedule) Sets the property LostRequestScopeSchedule.
void	setRequestScopeExpirationMilliseconds(int pRequestScopeExpirationMilliseconds) Sets the property RequestScopeExpirationMilliseconds.
void	setSaveRequestScopeOnRedirect(boolean pSaveRequestScopeOnRedirect) Sets the property SaveRequestScopeOnRedirect.
void	setScheduler(Scheduler pScheduler) Sets the Scheduler used to run the expiration and swapping checks.

Methods inherited from class atg.nucleus.GenericContext

addNameContextBindingListener, addNameContextPreBindingListener, clearElementLock, complainIfComponentAlreadyHasParentNameContext, createChildNameContext, getAttribute, getAttributeNames, getConfigurationLock, getContext, getContextPath, getDocumentRoot, getElement, getElementLock, getInitParameter, getInitParameterNames, getMajorVersion, getMimeType, getMimeTyper, getMinorVersion, getNameContextBindingListeners, getNameContextPreBindingListeners, getNamedDispatcher, getPendingElement, getRealPath, getRequestDispatcher, getResource, getResourceAsStream, getResourcePaths, getServerInfo, getServlet, getServletContextName, getServletNames, getServlets, isElementBound, isOptimizedForConcurrency, listElement, listElementNames, listElements, log, log, log, notifyAddedObject, notifyRemovedObject, preNotifyAddedObject, preNotifyRemovedObject, putElement, putPendingElement, removeAttribute, removeElement, removeNameContextBindingListener, removeNameContextPreBindingListener, removePendingElement, setAttribute, setDocumentRoot, setMimeTyper, startService, stopService

Methods inherited from class atg.nucleus.GenericService

addLogListener, createAdminServlet, getAbsoluteName, getAdminServlet, getAdminServletOutputStreamEncoding, getLoggingForVlogging, getLogListenerCount, getLogListeners, getName, getNameContext, getNucleus, getRoot, getServiceConfiguration, getServiceInfo, isAdminServletUseServletOutputStream, isLoggingDebug, isLoggingError, isLoggingInfo, isLoggingTrace, isLoggingWarning, isRunning, logDebug, logDebug, logDebug, logError, logError, logError, logInfo, logInfo, logInfo, logTrace, logTrace, logTrace, logWarning, logWarning, logWarning, nameContextElementBound, nameContextElementUnbound, removeLogListener, reResolveThis, resolveName, resolveName, resolveName, resolveName, sendLogEvent, setAdminServletOutputStreamEncoding, setAdminServletUseServletOutputStream, setLoggingDebug, setLoggingError, setLoggingInfo, setLoggingTrace, setLoggingWarning, setNucleus, setServiceInfo, toString

Methods inherited from class atg.nucleus.logging.VariableArgumentApplicationLoggingImpl

vlogDebug, vlogDebug, vlogDebug, vlogDebug, vlogDebugTrace, vlogError, vlogError, vlogError, vlogError, vlogInfo, vlogInfo, vlogInfo, vlogInfo, vlogTrace, vlogTrace, vlogTrace, vlogTrace, vlogWarning, vlogWarning, vlogWarning, vlogWarning

Methods inherited from class java.lang.Object

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

Methods inherited from interface atg.naming.NameContextElement

getName, getNameContext

Methods inherited from interface atg.naming.NameContextBindingListener

nameContextElementBound, nameContextElementUnbound

Field Detail

CLASS_VERSION

public static final java.lang.String CLASS_VERSION

Class version string

See Also:

Constant Field Values

REQUEST_SCOPE_PREFIX

public final java.lang.String REQUEST_SCOPE_PREFIX

The prefix for request scope names... followed by ID.

See Also:

Constant Field Values

Constructor Detail

RequestScopeManager

public RequestScopeManager()

Constructs a new blank RequestScopeManager

Method Detail

doStartService

public void doStartService()
                    throws ServiceException

Description copied from class: GenericService

This is called after a Service has been created, placed into the naming hierarchy, and initialized with its configured property values. The Service should override this method to start any processes it requires.

Overrides:

doStartService in class GenericService

Throws:

ServiceException - if the Service had a problem starting up

doStopService

public void doStopService()
                   throws ServiceException

Description copied from class: GenericContext

This is called when a Service is required to shut down. The Service should respond by stopping any processes that it has started. This will also stop any services contained by this service.

Overrides:

doStopService in class GenericContext

Throws:

ServiceException - if the Service had a problem shutting down

getScheduler

public Scheduler getScheduler()

Returns the Scheduler used to run the expiration and swapping checks.

setScheduler

public void setScheduler(Scheduler pScheduler)

Sets the Scheduler used to run the expiration and swapping checks.

setLostRequestScopeSchedule

public void setLostRequestScopeSchedule(Schedule pLostRequestScopeSchedule)

Sets the property LostRequestScopeSchedule.

getLostRequestScopeSchedule

public Schedule getLostRequestScopeSchedule()

Returns:

The value of the property LostRequestScopeSchedule.

setRequestScopeExpirationMilliseconds

public void setRequestScopeExpirationMilliseconds(int pRequestScopeExpirationMilliseconds)

Sets the property RequestScopeExpirationMilliseconds. This determines how long we hold onto request scopes after we issue a redirect before they are expired. The default is 5 minutes. As soon as a redirect does come in, its request scope is reattached.

getRequestScopeExpirationMilliseconds

public int getRequestScopeExpirationMilliseconds()

Returns:

The value of the property RequestScopeExpirationMilliseconds.

setSaveRequestScopeOnRedirect

public void setSaveRequestScopeOnRedirect(boolean pSaveRequestScopeOnRedirect)

Sets the property SaveRequestScopeOnRedirect.

getSaveRequestScopeOnRedirect

public boolean getSaveRequestScopeOnRedirect()

Returns:

The value of the property SaveRequestScopeOnRedirect.

getNumSavedRequestScopes

public int getNumSavedRequestScopes()

Read-only property which returns the number of request scopes that we are currently holding onto for pending redirects.

generateId

public int generateId()

Generates a new id and returns it.

readId

public int readId()

getContext

public GenericContext getContext(java.lang.Object pKey)

Deprecated.

Returns the GenericContext for the given Key.

getContext

public GenericContext getContext(java.lang.Object pKey,
                                 int pId)

Returns the GenericContext for the given Key and id

saveRequestScope

public int saveRequestScope(java.lang.Object pKey,
                            java.lang.String pSessionId)

Save a request scope, returning an integer id with which this request scope can later be reclaimed. If a session id is provides, the request scope can only be retrieved from the same session (this is a security measure).

getSavedRequestScope

public GenericContext getSavedRequestScope(java.lang.Object pKey,
                                           int pId,
                                           java.lang.String pSessionId)

Returns the saved request scope, while also removing it from the saved store.

getManagedScopeName

public java.lang.String getManagedScopeName()

Specified by:

getManagedScopeName in interface atg.nucleus.ScopeManager

performScheduledTask

public void performScheduledTask(Scheduler pScheduler,
                                 ScheduledJob pJob)

This is called once for the minimum timeout specified by save requestScope. We check for request scopes that should be culled because they have expired and we remove them. This should typically not find too many of them because it is rare that a redirect fails to return to the server.

Specified by:

performScheduledTask in interface Schedulable

Parameters:

pScheduler - calling the job

pJob - the ScheduledJob

removeContext

public boolean removeContext(java.lang.Object pKey)

Removes the request context object stored for the key specified

Returns:

true if the element existed and was removed, false otherwise.

getRootContextForRequest

public NameContext getRootContextForRequest(DynamoHttpServletRequest pRequest)

Get the root reqwuest scope for the specified request.

Specified by:

getRootContextForRequest in interface atg.nucleus.ScopeManager

Parameters:

pRequest - the request to access.

canReferenceOtherScope

public boolean canReferenceOtherScope(atg.nucleus.ScopeManager pScopeManager)

Specified by:

canReferenceOtherScope in interface atg.nucleus.ScopeManager

isInheritsEffectiveScope

public boolean isInheritsEffectiveScope()

Specified by:

isInheritsEffectiveScope in interface atg.nucleus.ScopeManager