com.atomikos.datasource.xa

Class XATransactionalResource

java.lang.Object

com.atomikos.datasource.xa.XATransactionalResource

All Implemented Interfaces:

RecoverableResource, TransactionalResource

Direct Known Subclasses:

JdbcTransactionalResource, JmsTransactionalResource

public abstract class XATransactionalResource
extends Object
implements TransactionalResource

An abstract XA implementation of a transactional resource. For a particular XA data source, it is necessary to implement the refreshXAConnection method, because in general there is no standard way of getting XAResource instances. Therefore, this class is agnostic about it. It is assumed that there is at most one instance per (root transaction, server) combination. Otherwise, siblings can not be mapped to the same ResourceTransaction! This instance is responsible for mapping siblings to ResourceTransaction instances.

Field Summary

Fields

Modifier and Type	Field and Description
protected XAResource	xares_

Constructor Summary

Constructors

Constructor and Description
XATransactionalResource(String uniqueResourceName) Construct a new instance with a default XidFactory.
XATransactionalResource(String uniqueResourceName, XidFactory factory) Construct a new instance with a custom XidFactory.

Method Summary

Modifier and Type	Method and Description
void	close() The default close operation.
protected XID	createXid(String tid) Create an XID for the given tx.
boolean	equals(Object o)
String	getName()
ResourceTransaction	getResourceTransaction(CompositeTransaction ct)
XAResource	getXAResource() Get the XAResource instance that this instance is using.
XidFactory	getXidFactory() Get the xidFactory for this instance.
int	hashCode()
boolean	hasPendingParticipantsFromLastRecoveryScan()
boolean	isClosed() Test if the resource is closed.
boolean	isSameRM(RecoverableResource res)
protected boolean	needsRefresh() Check if the XAResource needs to be refreshed.
boolean	recover(long startOfRecoveryScan, Collection<PendingTransactionRecord> expiredCommittingCoordinators, Collection<PendingTransactionRecord> indoubtForeignCoordinatorsToKeep)
protected abstract XAResource	refreshXAConnection() Utility method to establish and refresh the XAResource.
void	setRecoveryService(RecoveryService recoveryService)
void	setXidFactory(XidFactory factory) Set the XID factory, needed for online management tools.
boolean	usesXAResource(XAResource xares) Test if the XAResource is used by this instance.

Methods inherited from class java.lang.Object

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

Field Detail

xares_

protected XAResource xares_

Constructor Detail

XATransactionalResource

public XATransactionalResource(String uniqueResourceName)

Construct a new instance with a default XidFactory.

XATransactionalResource

public XATransactionalResource(String uniqueResourceName,
                               XidFactory factory)

Construct a new instance with a custom XidFactory.

Method Detail

refreshXAConnection

protected abstract XAResource refreshXAConnection()
                                           throws ResourceException

Utility method to establish and refresh the XAResource. An XAResource is actually a connection to a back-end resource, and this connection needs to stay open for the transactional resource instance. The resource uses the XAResource regularly, but sometimes the back-end server can close the connection after a time-out. At intialization time and also after such a time-out, this method is called to refresh the XAResource instance. This is typically done by (re-)establishing a connection to the server and keeping this connection open!.

Returns:

XAResource A XAResource instance that will be used to represent the server.

Throws:

ResourceException - On failure.

getXidFactory

public XidFactory getXidFactory()

Get the xidFactory for this instance. Needed by XAResourceTransaction to create new XID.

Returns:

XidFactory The XidFactory for the resource.

needsRefresh

protected boolean needsRefresh()

Check if the XAResource needs to be refreshed.

Returns:

boolean True if the XAResource needs refresh.

usesXAResource

public boolean usesXAResource(XAResource xares)

Test if the XAResource is used by this instance.

Parameters:

xares - The XAResource to test.

Returns:

boolean True iff this instance uses the same back-end resource, in as far as this can be determined by this instance.

getXAResource

public XAResource getXAResource()

Get the XAResource instance that this instance is using.

Returns:

XAResource The XAResource instance.

getResourceTransaction

public ResourceTransaction getResourceTransaction(CompositeTransaction ct)
                                           throws ResourceException,
                                                  IllegalStateException

Specified by:

getResourceTransaction in interface TransactionalResource

Throws:

ResourceException

IllegalStateException

See Also:

TransactionalResource

getName

public String getName()

Specified by:

getName in interface RecoverableResource

See Also:

TransactionalResource

close

public void close()
           throws ResourceException

The default close operation. Subclasses may need to override this method in order to process XA-specific close procedures such as closing connections.

Specified by:

close in interface RecoverableResource

Throws:

ResourceException

isClosed

public boolean isClosed()
                 throws ResourceException

Test if the resource is closed.

Specified by:

isClosed in interface RecoverableResource

Returns:

boolean True if closed.

Throws:

ResourceException

isSameRM

public boolean isSameRM(RecoverableResource res)
                 throws ResourceException

Specified by:

isSameRM in interface RecoverableResource

Throws:

ResourceException

See Also:

RecoverableResource

setRecoveryService

public void setRecoveryService(RecoveryService recoveryService)
                        throws ResourceException

Specified by:

setRecoveryService in interface RecoverableResource

Throws:

ResourceException

See Also:

RecoverableResource

setXidFactory

public void setXidFactory(XidFactory factory)

Set the XID factory, needed for online management tools.

Parameters:

factory -

createXid

protected XID createXid(String tid)

Create an XID for the given tx.

Parameters:

tid - The tx id.

Returns:

Xid A globally unique Xid that can be recovered by any resource that connects to the same EIS.

recover

public boolean recover(long startOfRecoveryScan,
                       Collection<PendingTransactionRecord> expiredCommittingCoordinators,
                       Collection<PendingTransactionRecord> indoubtForeignCoordinatorsToKeep)

Specified by:

recover in interface RecoverableResource

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

hasPendingParticipantsFromLastRecoveryScan

public boolean hasPendingParticipantsFromLastRecoveryScan()

Specified by:

hasPendingParticipantsFromLastRecoveryScan in interface RecoverableResource