CosTransactions_Resource - Online Linux Manual PageSection : 3
Updated : cosTransactions 5.0
Source : Ericsson AB
Note : Erlang Module Definition

NAMECosTransactions_Resource − This module implements the OMG CosTransactions::Resource interface.

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

EXPORTScommit(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 circumstances 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​.
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