scala.concurrent.stm.Txn

ExternalDecider

trait ExternalDecider extends AnyRef

An ExternalDecider is given the final control over the decision of whether or not to commit a transaction, which allows two-phase commit to be integrated with a single non-transactional resource. shouldCommit will only be called if a InTxn has successfully called all of its before-commit handlers, acquired all necessary write locks, validated all of its reads and called all of its while-preparing handlers. The decider may then attempt a non-transactional operation whose outcome is uncertain, and based on the outcome may directly cause the transaction to commit or roll back.

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  1. def shouldCommit (implicit txn: InTxnEnd): Boolean

    Should return true if the end-of-life transaction txn should commit, false if it should roll back.

    Should return true if the end-of-life transaction txn should commit, false if it should roll back. Txn.rollback may also be used to initiate a rollback if that is more convenient. Called while the status is Prepared. This method may not access any Refs, even via Ref.single.

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