| java.lang.Object
 org.apache.derby.impl.store.raw.xact.XactXAResourceManager
| XactXAResourceManager | | public class XactXAResourceManager implements XAResourceManager(Code) | | The XactXAResourceManager implements the Access XAResource interface, which
provides offline control over two phase commit transactions. It is expected
to be used by TM's (transaction manager's), to recover if systems fail while
transactions are still in-doubt (prepared).
This interface allows access to commit,prepare,abort global transactions
as part of a two phase commit protocol. These interfaces have been chosen
to be exact implementations required to implement the XAResource interfaces
as part of the JTA standard extension.
It is expected that the following interfaces are only used during the
recovery portion of 2 phase commit, when the transaction manager is
cleaning up after a runtime crash - it is expected that no current context
managers exist for the Xid's being operated on. The "online" two phase commit
protocol will be implemented by calls directly on a TransactionController.
The XAResource interface is a Java mapping of the industry standard XA resource
manager interface. Please refer to: X/Open CAE Specification - Distributed
Transaction Processing: The XA Specification, X/Open Document No. XO/CAE/91/300
or ISBN 1 872630 24 3.
See Also: org.apache.derby.iapi.store.access.xa.XAResourceManager |
| Method Summary | |
| public void | commit(ContextManager cm, Xid xid, boolean onePhase)
This method is called to commit the global transaction specified by xid. | | public ContextManager | find(Xid xid)
Find the given Xid in the transaction table.
This routine is used to find a in-doubt transaction from the list
of Xid's returned from the recover() routine. | | public void | forget(ContextManager cm, Xid xid)
This method is called to remove the given transaction
from the transaction table/log.
Used to let the store remove all record from log and transaction
table of the given transaction. | | public Xid[] | recover(int flags)
This method is called to obtain a list of prepared transactions.
This call returns a complete list of global transactions which are
either prepared or heuristically complete.
The XAResource interface expects a scan type interface, but our
implementation only returns a complete list of transactions. | | public void | rollback(ContextManager cm, Xid xid)
rollback the transaction identified by Xid. |
| commit | | public void commit(ContextManager cm, Xid xid, boolean onePhase) throws StandardException(Code) | | This method is called to commit the global transaction specified by xid.
RESOLVE - how do we map to the "right" XAExceptions.
Parameters:
cm - The ContextManager returned from the find() call.
Parameters:
xid - A global transaction identifier.
Parameters:
onePhase - If true, the resource manager should use a one-phasecommit protocol to commit the work done on behalf of xid.
exception:
StandardException - Standard exception policy. |
| find | | public ContextManager find(Xid xid)(Code) | | Find the given Xid in the transaction table.
This routine is used to find a in-doubt transaction from the list
of Xid's returned from the recover() routine.
In the current implementation it is up to the calling routine
to make the returned ContextManager the "current" ContextManager
before calls to commit,abort, or forget. The caller is responsible
for error handling, ie. calling cleanupOnError() on the correct
ContextManager.
If the Xid is not in the system, "null" is returned.
RESOLVE - find out from sku if she wants a exception instead?
Parameters:
xid - A global transaction identifier. |
| forget | | public void forget(ContextManager cm, Xid xid) throws StandardException(Code) | | This method is called to remove the given transaction
from the transaction table/log.
Used to let the store remove all record from log and transaction
table of the given transaction. This should only be used to
clean up heuristically completed transactions, otherwise commit or
abort should be used to act on other transactions.
Parameters:
cm - The ContextManager returned from the find() call.
Parameters:
xid - A global transaction identifier.
exception:
StandardException - Standard exception policy. |
| recover | | public Xid[] recover(int flags) throws StandardException(Code) | | This method is called to obtain a list of prepared transactions.
This call returns a complete list of global transactions which are
either prepared or heuristically complete.
The XAResource interface expects a scan type interface, but our
implementation only returns a complete list of transactions. So to
simulate the scan the following state is maintained. If TMSTARTSCAN
is specified the complete list is returned. If recover is called with
TMNOFLAGS is ever called a 0 length array is returned.
Return a array with 0 or more Xid's which are currently inprepared or heuristically completed state. If an error occursduring the operation, an appropriate error is thrown.
Parameters:
flags - combination of the following flags XAResource.{TMSTARTRSCAN,TMENDRSCAN,TMNOFLAGS}. TMNOFLAGS must be used when no other flags are used.
exception:
StandardException - Standard exception policy. |
| rollback | | public void rollback(ContextManager cm, Xid xid) throws StandardException(Code) | | rollback the transaction identified by Xid.
The given transaction is roll'ed back and it's history is not
maintained in the transaction table or long term log.
Parameters:
cm - The ContextManager returned from the find() call.
Parameters:
xid - A global transaction identifier.
exception:
StandardException - Standard exception policy. |
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