Package org.projectnessie.versioned.persist.nontx

Interface NonTransactionalDatabaseAdapter.CasOp<R>

Enclosing class:

NonTransactionalDatabaseAdapter<CONFIG extends NonTransactionalDatabaseAdapterConfig>

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public static interface NonTransactionalDatabaseAdapter.CasOp<R>

"Body" of a Compare-And-Swap loop that returns the value to apply. NonTransactionalDatabaseAdapter.casOpLoop(String, NamedRef, CasOpVariant, CasOp, Supplier) then tries to perform the Compare-And-Swap using the known "current value", as passed via the pointer parameter to apply(NonTransactionalOperationContext, RefPointer, Consumer, Consumer), and the "new value" from the return value.

Method Summary

Modifier and Type	Method	Description
NonTransactionalDatabaseAdapter.CasOpResult<R>	apply(NonTransactionalOperationContext ctx, org.projectnessie.versioned.persist.serialize.AdapterTypes.RefPointer refPointer, java.util.function.Consumer<org.projectnessie.versioned.Hash> branchCommits, java.util.function.Consumer<org.projectnessie.versioned.Hash> newKeyLists)	Applies an operation within a CAS-loop.

Method Detail

apply

NonTransactionalDatabaseAdapter.CasOpResult<R> apply(NonTransactionalOperationContext ctx,
                                                     org.projectnessie.versioned.persist.serialize.AdapterTypes.RefPointer refPointer,
                                                     java.util.function.Consumer<org.projectnessie.versioned.Hash> branchCommits,
                                                     java.util.function.Consumer<org.projectnessie.versioned.Hash> newKeyLists)
                                              throws org.projectnessie.versioned.VersionStoreException

Applies an operation within a CAS-loop. The implementation gets the current ref-pointer and must return a NonTransactionalDatabaseAdapter.CasOpResult with the reference's new HEAD and function to configure the ref-log entry.

Parameters:

ctx - operation context

refPointer - information about the target named reference

branchCommits - if more commits than the one returned via the return value were optimistically written, those must be passed to this consumer.

newKeyLists - IDs of optimistically written KeyListEntity entities must be passed to this consumer.

Returns:

"new value" that NonTransactionalDatabaseAdapter.casOpLoop(String, NamedRef, CasOpVariant, CasOp, Supplier) tries to apply

Throws:

org.projectnessie.versioned.VersionStoreException