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package javax.transaction.xa;
/** <p>The XAResource interface is a Java mapping of the industry standard
* XA interface based on the X/Open CAE Specification (Distributed
* Transaction Processing: The XA Specification).
*
* <p>The XA interface defines the contract between a Resource Manager
* and a Transaction Manager in a distributed transaction processing
* (DTP) environment. A JDBC driver or a JMS provider implements
* this interface to support the association between a global transaction
* and a database or message service connection.
*
* <p>The XAResource interface can be supported by any transactional
* resource that is intended to be used by application programs in an
* environment where transactions are controlled by an external
* transaction manager. An example of such a resource is a database
* management system. An application may access data through multiple
* database connections. Each database connection is enlisted with
* the transaction manager as a transactional resource. The transaction
* manager obtains an XAResource for each connection participating
* in a global transaction. The transaction manager uses the
* <code>start</code> method
* to associate the global transaction with the resource, and it uses the
* <code>end</code> method to disassociate the transaction from
* the resource. The resource
* manager is responsible for associating the global transaction to all
* work performed on its data between the start and end method invocations.
*
* <p>At transaction commit time, the resource managers are informed by
* the transaction manager to prepare, commit, or rollback a transaction
* according to the two-phase commit protocol.</p>
*
*/
public interface XAResource
{
/** Commits the global transaction specified by xid.
*
* @param xid A global transaction identifier
*
* @param onePhase If true, the resource manager should use a one-phase
* commit protocol to commit the work done on behalf of xid.
*
* @exception XAException An error has occurred. Possible XAExceptions
* are XA_HEURHAZ, XA_HEURCOM, XA_HEURRB, XA_HEURMIX, XAER_RMERR,
* XAER_RMFAIL, XAER_NOTA, XAER_INVAL, or XAER_PROTO.
*
* <P>If the resource manager did not commit the transaction and the
* parameter onePhase is set to true, the resource manager may throw
* one of the XA_RB* exceptions. Upon return, the resource manager has
* rolled back the branch's work and has released all held resources.
*/
void commit(Xid xid, boolean onePhase) throws XAException;
/** Ends the work performed on behalf of a transaction branch.
* The resource manager disassociates the XA resource from the
* transaction branch specified and lets the transaction
* complete.
*
* <p>If TMSUSPEND is specified in the flags, the transaction branch
* is temporarily suspended in an incomplete state. The transaction
* context is in a suspended state and must be resumed via the
* <code>start</code> method with TMRESUME specified.</p>
*
* <p>If TMFAIL is specified, the portion of work has failed.
* The resource manager may mark the transaction as rollback-only</p>
*
* <p>If TMSUCCESS is specified, the portion of work has completed
* successfully.</p>
*
* @param xid A global transaction identifier that is the same as
* the identifier used previously in the <code>start</code> method.
*
* @param flags One of TMSUCCESS, TMFAIL, or TMSUSPEND.
*
* @exception XAException An error has occurred. Possible XAException
* values are XAER_RMERR, XAER_RMFAIL, XAER_NOTA, XAER_INVAL,
* XAER_PROTO, or XA_RB*.
*/
void end(Xid xid, int flags) throws XAException;
/** Tells the resource manager to forget about a heuristically
* completed transaction branch.
*
* @param xid A global transaction identifier.
*
* @exception XAException An error has occurred. Possible exception
* values are XAER_RMERR, XAER_RMFAIL, XAER_NOTA, XAER_INVAL, or
* XAER_PROTO.
*/
void forget(Xid xid) throws XAException;
/** Obtains the current transaction timeout value set for this
* XAResource instance. If <CODE>XAResource.setTransactionTimeout</CODE>
* was not used prior to invoking this method, the return value
* is the default timeout set for the resource manager; otherwise,
* the value used in the previous <CODE>setTransactionTimeout</CODE>
* call is returned.
*
* @return the transaction timeout value in seconds.
*
* @exception XAException An error has occurred. Possible exception
* values are XAER_RMERR and XAER_RMFAIL.
*/
int getTransactionTimeout() throws XAException;
/** This method is called to determine if the resource manager
* instance represented by the target object is the same as the
* resouce manager instance represented by the parameter <i>xares</i>.
*
* @param xares An XAResource object whose resource manager instance
* is to be compared with the resource manager instance of the
* target object.
*
* @return <i>true</i> if it's the same RM instance; otherwise
* <i>false</i>.
*
* @exception XAException An error has occurred. Possible exception
* values are XAER_RMERR and XAER_RMFAIL.
*
*/
boolean isSameRM(XAResource xares) throws XAException;
/** Ask the resource manager to prepare for a transaction commit
* of the transaction specified in xid.
*
* @param xid A global transaction identifier.
*
* @exception XAException An error has occurred. Possible exception
* values are: XA_RB*, XAER_RMERR, XAER_RMFAIL, XAER_NOTA, XAER_INVAL,
* or XAER_PROTO.
*
* @return A value indicating the resource manager's vote on the
* outcome of the transaction. The possible values are: XA_RDONLY
* or XA_OK. If the resource manager wants to roll back the
* transaction, it should do so by raising an appropriate XAException
* in the prepare method.
*/
int prepare(Xid xid) throws XAException;
/** Obtains a list of prepared transaction branches from a resource
* manager. The transaction manager calls this method during recovery
* to obtain the list of transaction branches that are currently in
* prepared or heuristically completed states.
*
* @param flag One of TMSTARTRSCAN, TMENDRSCAN, TMNOFLAGS. TMNOFLAGS
* must be used when no other flags are set in the parameter.
*
* @exception XAException An error has occurred. Possible values are
* XAER_RMERR, XAER_RMFAIL, XAER_INVAL, and XAER_PROTO.
*
* @return The resource manager returns zero or more XIDs of the
* transaction branches that are currently in a prepared or
* heuristically completed state. If an error occurs during the
* operation, the resource manager should throw the appropriate
* XAException.
*
*/
Xid[] recover(int flag) throws XAException;
/** Informs the resource manager to roll back work done on behalf
* of a transaction branch.
*
* @param xid A global transaction identifier.
*
* @exception XAException An error has occurred. Possible XAExceptions are
* XA_HEURHAZ, XA_HEURCOM, XA_HEURRB, XA_HEURMIX, XAER_RMERR, XAER_RMFAIL,
* XAER_NOTA, XAER_INVAL, or XAER_PROTO.
*
* <p>If the transaction branch is already marked rollback-only the
* resource manager may throw one of the XA_RB* exceptions. Upon return,
* the resource manager has rolled back the branch's work and has released
* all held resources.
*/
void rollback(Xid xid) throws XAException;
/** <P>Sets the current transaction timeout value for this <CODE>XAResource</CODE>
* instance. Once set, this timeout value is effective until
* <code>setTransactionTimeout</code> is invoked again with a different
* value. To reset the timeout value to the default value used by the resource
* manager, set the value to zero.
*
* If the timeout operation is performed successfully, the method returns
* <i>true</i>; otherwise <i>false</i>. If a resource manager does not
* support explicitly setting the transaction timeout value, this method
* returns <i>false</i>.
*
* @param seconds The transaction timeout value in seconds.
*
* @return <i>true</i> if the transaction timeout value is set successfully;
* otherwise <i>false</i>.
*
* @exception XAException An error has occurred. Possible exception values
* are XAER_RMERR, XAER_RMFAIL, or XAER_INVAL.
*/
boolean setTransactionTimeout(int seconds) throws XAException;
/** Starts work on behalf of a transaction branch specified in
* <code>xid</code>.
*
* If TMJOIN is specified, the start applies to joining a transaction
* previously seen by the resource manager. If TMRESUME is specified,
* the start applies to resuming a suspended transaction specified in the
* parameter <code>xid</code>.
*
* If neither TMJOIN nor TMRESUME is specified and the transaction
* specified by <code>xid</code> has previously been seen by the resource
* manager, the resource manager throws the XAException exception with
* XAER_DUPID error code.
*
* @param xid A global transaction identifier to be associated
* with the resource.
*
* @param flags One of TMNOFLAGS, TMJOIN, or TMRESUME.
*
* @exception XAException An error has occurred. Possible exceptions
* are XA_RB*, XAER_RMERR, XAER_RMFAIL, XAER_DUPID, XAER_OUTSIDE,
* XAER_NOTA, XAER_INVAL, or XAER_PROTO.
*
*/
void start(Xid xid, int flags) throws XAException;
/**
* Ends a recovery scan.
*/
public final static int TMENDRSCAN = 0x00800000;
/**
* Disassociates the caller and marks the transaction branch
* rollback-only.
*/
public final static int TMFAIL = 0x20000000;
/**
* Caller is joining existing transaction branch.
*/
public final static int TMJOIN = 0x00200000;
/**
* Use TMNOFLAGS to indicate no flags value is selected.
*/
public final static int TMNOFLAGS = 0x00000000;
/**
* Caller is using one-phase optimization.
*/
public final static int TMONEPHASE = 0x40000000;
/**
* Caller is resuming association with a suspended
* transaction branch.
*/
public final static int TMRESUME = 0x08000000;
/**
* Starts a recovery scan.
*/
public final static int TMSTARTRSCAN = 0x01000000;
/**
* Disassociates caller from a transaction branch.
*/
public final static int TMSUCCESS = 0x04000000;
/**
* Caller is suspending (not ending) its association with
* a transaction branch.
*/
public final static int TMSUSPEND = 0x02000000;
/**
* The transaction branch has been read-only and has been committed.
*/
public final static int XA_RDONLY = 0x00000003;
/**
* The transaction work has been prepared normally.
*/
public final static int XA_OK = 0;
}
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