CosTransactions_Resource

MODULE

CosTransactions_Resource

MODULE SUMMARY

DESCRIPTION

To get access to the record definitions for the structures use:
-include_lib("cosTransactions/include/CosTransactions.hrl").

EXPORTS

commit(Resource) -> Return

Types:
Resource = #objref
Return = ok | {'EXCEPTION', E}
E = #'CosTransactions_NotPrepared'{} | #'CosTransactions_HeuristicRollback'{} | #'CosTransactions_HeuristicMixed'{} | #'CosTransactions_HeuristicHazard'{}

This operation instructs the Resource to commit all changes made as a part of the transaction.

The Resource can raise:

• Heuristic Exception - if a Heuristic decision is made which differ from the true outcome of the transaction. The Resource must remember the Heuristic outcome until the forget operation is performed.

commit_one_phase(Resource) -> Return

Types:
Resource = #objref
Return = ok | {'EXCEPTION', E}
E = #'CosTransactions_HeuristicHazard'{} | #'CosTransactions_TransactionRolledBack'{}

If possible, the Resource should commit all changes made as part of the transaction, else it should raise the TRANSACTION_ROLLEDBACK exception. This operation can only be used if the Resource is the only child of its parent.

forget(Resource) -> Return

Types:
Resource = #objref
Return = ok

This operation informs the Resource that it is safe to forget any Heuristic decisions and the knowledge of the transaction.

prepare(Resource) -> Return

Types:
Resource = #objref
Return = Vote | {'EXCEPTION', E}
Vote = 'VoteReadOnly' | 'VoteCommit' | 'VoteRollback'
E = #'CosTransactions_HeuristicMixed'{} | #'CosTransactions_HeuristicHazard'{}

This operation is invoked on the Resource to begin the two-phase commit protocol.

The Resource can reply:

• 'VoteReadOnly' - if no persistent data has been modified by the transaction. The Resource can forget all knowledge of the transaction.


• 'VoteCommit' - if the Resource has been prepared and is able to write all the data needed to commit the transaction to stable storage.


• 'VoteRollback' - under any circumstanses but must do so if none of the alternatives above are applicable.


• Heuristic Exception - if a Heuristic decision is made which differ from the true outcome of the transaction. The Resource must remember the Heuristic outcome until the forget operation is performed.

rollback(Resource) -> Return

Types:
Resource = #objref
Return = ok | {'EXCEPTION', E}
E = #'CosTransactions_HeuristicCommit'{} | #'CosTransactions_HeuristicMixed'{} | #'CosTransactions_HeuristicHazard'{}

This operation instructs the Resource to rollback all changes made as a part of the transaction.

The Resource can raise:

• Heuristic Exception - if a Heuristic decision is made which differ from the true outcome of the transaction. The Resource must remember the Heuristic outcome until the forget operation is performed.

AUTHORS

Niclas Eklund - support@erlang.ericsson.se