org.apache.jackrabbit.core.state
Class XAItemStateManager

java.lang.Object
  org.apache.jackrabbit.core.state.LocalItemStateManager
      org.apache.jackrabbit.core.state.XAItemStateManager

All Implemented Interfaces:

InternalXAResource, ItemStateListener, ItemStateManager, UpdatableItemStateManager

public class XAItemStateManager

extends LocalItemStateManager

implements InternalXAResource

Extension to LocalItemStateManager that remembers changes on multiple save() requests and commits them only when an associated transaction is itself committed.

Field Summary

Fields inherited from class org.apache.jackrabbit.core.state.LocalItemStateManager

factory, sharedStateMgr

Constructor Summary

XAItemStateManager(SharedItemStateManager sharedStateMgr, EventStateCollectionFactory factory)
Creates a new instance of this class.

XAItemStateManager(SharedItemStateManager sharedStateMgr, EventStateCollectionFactory factory, String attributeName)
Creates a new instance of this class with a custom attribute name.

Method Summary

void	afterOperation(TransactionContext tx) Invoked after one of the InternalXAResource.prepare(org.apache.jackrabbit.core.TransactionContext), InternalXAResource.commit(org.apache.jackrabbit.core.TransactionContext) or InternalXAResource.rollback(org.apache.jackrabbit.core.TransactionContext) method has been called.
void	associate(TransactionContext tx) Associate this resource with a transaction. All further operations on the object should be interpreted as part of this transaction and changes recorded in some attribute of the transaction context.
void	beforeOperation(TransactionContext tx) Invoked before one of the InternalXAResource.prepare(org.apache.jackrabbit.core.TransactionContext), InternalXAResource.commit(org.apache.jackrabbit.core.TransactionContext) or InternalXAResource.rollback(org.apache.jackrabbit.core.TransactionContext) method is called.
void	commit(TransactionContext tx) Commit transaction. The transaction is identified by a transaction context. If the method throws, other resources get their changes rolled back.
ChangeLog	getChangeLog() Returns the current change log.
ItemState	getItemState(ItemId id) Return an item state, given its item id. If this state manager is committing changes, this method first checks the commitLog ThreadLocal.
NodeReferences	getNodeReferences(NodeReferencesId id) Return a node references object, given its target id If this state manager is committing changes, this method first checks the commitLog ThreadLocal.
boolean	hasItemState(ItemId id) Return a flag indicating whether an item state for a given item id exists. If this state manager is committing changes, this method first checks the commitLog ThreadLocal.
boolean	hasNodeReferences(NodeReferencesId id) Return a flag indicating whether a node references object for a given target id exists. If this state manager is committing changes, this method first checks the commitLog ThreadLocal.
void	prepare(TransactionContext tx) Prepare transaction. The transaction is identified by a transaction context.
void	rollback(TransactionContext tx) Rollback transaction. The transaction is identified by a transaction context.
void	setVirtualProvider(VirtualItemStateProvider virtualProvider) Set optional virtual item state provider.
protected void	update(ChangeLog changeLog) End an update operation. Fetch the states and references from the parent (shared) item manager, reconnect them to the items collected in our (local) change log and overwrite the shared items with our copies. If associated with a transaction, simply merge the changes given to the ones already known (removing items that were first added and then again deleted).

Methods inherited from class org.apache.jackrabbit.core.state.LocalItemStateManager

cancel, createNew, createNew, destroy, dispose, edit, getNodeState, getPropertyState, inEditMode, stateCreated, stateDestroyed, stateDiscarded, stateModified, store, update

Methods inherited from class java.lang.Object

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

Constructor Detail

XAItemStateManager

public XAItemStateManager(SharedItemStateManager sharedStateMgr,
                          EventStateCollectionFactory factory)

Creates a new instance of this class.

Parameters:

sharedStateMgr - shared state manager

factory - event state collection factory

XAItemStateManager

public XAItemStateManager(SharedItemStateManager sharedStateMgr,
                          EventStateCollectionFactory factory,
                          String attributeName)

Creates a new instance of this class with a custom attribute name.

Parameters:

sharedStateMgr - shared state manager

factory - event state collection factory

attributeName - attribute name

Method Detail

setVirtualProvider

public void setVirtualProvider(VirtualItemStateProvider virtualProvider)

Set optional virtual item state provider.

associate

public void associate(TransactionContext tx)

Associate this resource with a transaction. All further operations on the object should be interpreted as part of this transaction and changes recorded in some attribute of the transaction context.

Specified by:

associate in interface InternalXAResource

Parameters:

tx - transaction context, if null disassociate

beforeOperation

public void beforeOperation(TransactionContext tx)

Invoked before one of the InternalXAResource.prepare(org.apache.jackrabbit.core.TransactionContext), InternalXAResource.commit(org.apache.jackrabbit.core.TransactionContext) or InternalXAResource.rollback(org.apache.jackrabbit.core.TransactionContext) method is called.

Specified by:

beforeOperation in interface InternalXAResource

Parameters:

tx - transaction context

prepare

public void prepare(TransactionContext tx)
             throws TransactionException

Prepare transaction. The transaction is identified by a transaction context.

Specified by:

prepare in interface InternalXAResource

Parameters:

tx - transaction context

Throws:

TransactionException - if an error occurs

commit

public void commit(TransactionContext tx)
            throws TransactionException

Commit transaction. The transaction is identified by a transaction context. If the method throws, other resources get their changes rolled back.

Specified by:

commit in interface InternalXAResource

Parameters:

tx - transaction context

Throws:

TransactionException - if an error occurs

rollback

public void rollback(TransactionContext tx)

Rollback transaction. The transaction is identified by a transaction context.

Specified by:

rollback in interface InternalXAResource

Parameters:

tx - transaction context.

afterOperation

public void afterOperation(TransactionContext tx)

Invoked after one of the InternalXAResource.prepare(org.apache.jackrabbit.core.TransactionContext), InternalXAResource.commit(org.apache.jackrabbit.core.TransactionContext) or InternalXAResource.rollback(org.apache.jackrabbit.core.TransactionContext) method has been called.

Specified by:

afterOperation in interface InternalXAResource

Parameters:

tx - transaction context

getChangeLog

public ChangeLog getChangeLog()

Returns the current change log. First tries thread-local change log, then instance-local change log. Returns null if no change log was found.

getItemState

public ItemState getItemState(ItemId id)
                       throws NoSuchItemStateException,
                              ItemStateException

Return an item state, given its item id.

If this state manager is committing changes, this method first checks the commitLog ThreadLocal. Else if associated to a transaction check the transactional change log. Fallback is always the call to the base class.

Specified by:

getItemState in interface ItemStateManager

Overrides:

getItemState in class LocalItemStateManager

Throws:

NoSuchItemStateException

ItemStateException

hasItemState

public boolean hasItemState(ItemId id)

Return a flag indicating whether an item state for a given item id exists.

If this state manager is committing changes, this method first checks the commitLog ThreadLocal. Else if associated to a transaction check the transactional change log. Fallback is always the call to the base class.

Specified by:

hasItemState in interface ItemStateManager

Overrides:

hasItemState in class LocalItemStateManager

getNodeReferences

public NodeReferences getNodeReferences(NodeReferencesId id)
                                 throws NoSuchItemStateException,
                                        ItemStateException

Return a node references object, given its target id

If this state manager is committing changes, this method first checks the commitLog ThreadLocal. Else if associated to a transaction check the transactional change log. Fallback is always the call to the base class.

Specified by:

getNodeReferences in interface ItemStateManager

Overrides:

getNodeReferences in class LocalItemStateManager

Throws:

NoSuchItemStateException

ItemStateException

hasNodeReferences

public boolean hasNodeReferences(NodeReferencesId id)

Return a flag indicating whether a node references object for a given target id exists.

If this state manager is committing changes, this method first checks the commitLog ThreadLocal. Else if associated to a transaction check the transactional change log. Fallback is always the call to the base class.

Specified by:

hasNodeReferences in interface ItemStateManager

Overrides:

hasNodeReferences in class LocalItemStateManager

update

protected void update(ChangeLog changeLog)
               throws ReferentialIntegrityException,
                      StaleItemStateException,
                      ItemStateException

End an update operation. Fetch the states and references from the parent (shared) item manager, reconnect them to the items collected in our (local) change log and overwrite the shared items with our copies.

If associated with a transaction, simply merge the changes given to the ones already known (removing items that were first added and then again deleted).

Overrides:

update in class LocalItemStateManager

Parameters:

changeLog - change log containing local states and references

Throws:

ItemStateException - if an error occurs

StaleItemStateException - if at least one of the affected item states has become stale in the meantime

ReferentialIntegrityException - if a new or modified REFERENCE property refers to a non-existent target or if a removed node is still being referenced