io.goshawkdb.client

Interface TransactionFunction<R>

All Superinterfaces:

java.util.function.Function<Transaction,R>

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 interface TransactionFunction<R>
extends java.util.function.Function<Transaction,R>

Implement this interface to create transaction funs that can be passed to Connection's runTransaction. This can neatly be done inline using a lambda expression. The transaction may be automatically run several times if the server rejects the transaction for various reasons. Therefore your transaction must not have any side effects until after the transaction has committed (or you have chosen for the transaction to abort).

Method Summary

Modifier and Type	Method and Description
R	apply(Transaction txn) The callback invoked (potentially several times) to run your transaction.

Methods inherited from interface java.util.function.Function

andThen, compose, identity

Method Detail

apply

R apply(Transaction txn)

The callback invoked (potentially several times) to run your transaction. If you wish to abort the transaction, throw a TransactionAbortedException from within the transaction.

Specified by:

apply in interface java.util.function.Function<Transaction,R>

Parameters:

txn - The API through which your transaction can navigate and interact with the object-graph stored by GoshawkDB.

Returns:

A result