com.bigdata.btree.isolation

Interface IConflictResolver

All Superinterfaces:

Serializable

All Known Implementing Classes:

NoConflictResolver, TestConflictResolution.SingleValueConflictResolver

public interface IConflictResolver
extends Serializable

An interface invoked during backward validation when a write-write conflict has been detected. The implementation must either resolve the write-write conflict by returning a new version in which the conflict is resolved or report an unresolvable conflict, in which case backward validation will force the transaction to abort.

Version:

$Id$

Author:

Bryan Thompson

See Also:

for an excellent discussion of data type specific state-based conflict resolution, including examples for things such as bank accounts.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	resolveConflict(IIndex writeSet, ITuple txTuple, ITuple currentTuple) Resolve a write-write conflict between a committed version on the journal and the current version within a transaction that is validating.

Method Detail

resolveConflict

boolean resolveConflict(IIndex writeSet,
                      ITuple txTuple,
                      ITuple currentTuple)
                        throws Exception

Resolve a write-write conflict between a committed version on the journal and the current version within a transaction that is validating.

Parameters:

writeSet - The view on which conflict resolver must write the resolved index entry.

txTuple - The tuple written by the transaction that is being validated.

currentTuple - The current tuple committed in the global state with which the write-write conflict exists.

Returns:

true iff the conflict was resolved.

Throws:

Exception