Package org.ops4j.pax.web.service.spi.task

Class Change

java.lang.Object

org.ops4j.pax.web.service.spi.task.Change

Direct Known Subclasses:

ClearDynamicRegistrationsChange, ContainerInitializerModelChange, ContextMetadataModelChange, ContextParamsChange, ContextStartChange, ContextStopChange, ErrorPageModelChange, ErrorPageStateChange, EventListenerModelChange, FilterModelChange, FilterStateChange, MimeAndLocaleMappingChange, OsgiContextModelChange, SecurityConfigChange, ServletContextModelChange, ServletModelChange, TransactionStateChange, WebSocketModelChange, WelcomeFileModelChange

public abstract class Change
extends Object

Single operation to be performed within a Batch. For now it has two purposes:

• Global model alteration
• Interaction with ServerController to turn model changes into actual server runtime (re)configuration operations.

Constructor Summary

Constructors

Constructor	Description
Change(OpCode kind)

Method Summary

Modifier and Type	Method	Description
abstract void	accept(BatchVisitor visitor)	Perform an operation in acceptor-visitor pattern.
Change	getBatchCompletedAction()
List<OsgiContextModel>	getContextModels()	Get a list of associated context models.
OpCode	getKind()
void	registerBatchCompletedAction(Change action)	If during action/change handling, the visitor (action invoker) decides there's another action to perform but in separate thread (next "tick" of single event thread), this is the way to register such action.
void	uninstall(List<Change> operations)	A Change may be reversed, which is handy when rolling back existing Batch.

Methods inherited from class java.lang.Object

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

Constructor Detail

Change

public Change(OpCode kind)

Method Detail

getKind

public OpCode getKind()

accept

public abstract void accept(BatchVisitor visitor)

Perform an operation in acceptor-visitor pattern.

Parameters:

visitor -

getContextModels

public List<OsgiContextModel> getContextModels()

Get a list of associated context models.

Usually the list comes from associated model being ADDed and usually doesn't make sense when a change concerns more models. Special scenario is to get a list of new context models associated with existing element model after it has been removed (from previous list of associated contexts) in the same Batch.

Returns:

uninstall

public void uninstall(List<Change> operations)

A Change may be reversed, which is handy when rolling back existing Batch. A single change may be a no-op during uninstallation (like for example welcome files), but also may consist of more uninstallation changes - like OsgiContextModelChange which has to follow unregistrations of dynamic servlets/filters/listeners.

registerBatchCompletedAction

public void registerBatchCompletedAction(Change action)

If during action/change handling, the visitor (action invoker) decides there's another action to perform but in separate thread (next "tick" of single event thread), this is the way to register such action.

Parameters:

action -

getBatchCompletedAction

public Change getBatchCompletedAction()