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.

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 an exception from within.

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

Throws:

java.lang.Exception - your callback may throw an exception, for example to indicate you wish the transaction to be aborted.