com.sleepycat.client

Interface TxnHelper

All Known Implementing Classes:

SDatabase, SEnvironment, SSecondaryDatabase

public interface TxnHelper

TxnHelper implements a few helper methods for working with transactions.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	TxnHelper.TransactionOperations<V>

Method Summary

Modifier and Type	Method and Description
SEnvironment	getEnvironment() Return the environment used to create transactions.
default <V> V	runInSingleTxn(STransaction userTxn, java.util.function.Function<STransaction,V> operations) Run multiple operations in the context of a single transaction.
default <V> V	runInSingleTxnWithIOException(STransaction userTxn, TxnHelper.TransactionOperations<V> operations) Run multiple operations in the context of a single transaction.

Method Detail

getEnvironment

SEnvironment getEnvironment()

Return the environment used to create transactions.

Returns:

the environment used to create transactions

runInSingleTxn

default <V> V runInSingleTxn(STransaction userTxn,
                             java.util.function.Function<STransaction,V> operations)
                      throws SDatabaseException

Run multiple operations in the context of a single transaction. If the user-specified transaction is not null, operations are run in the context of the user-specified transaction. Otherwise, the operations are run in a new transaction.

Type Parameters:

V - the type of the result

Parameters:

userTxn - the user-specified transaction, may be null

operations - the operations

Returns:

the result of the operations

Throws:

SDatabaseException - on error

runInSingleTxnWithIOException

default <V> V runInSingleTxnWithIOException(STransaction userTxn,
                                            TxnHelper.TransactionOperations<V> operations)
                                     throws java.io.IOException,
                                            SDatabaseException

Run multiple operations in the context of a single transaction. If the user-specified transaction is not null, operations are run in the context of the user-specified transaction. Otherwise, the operations are run in a new transaction.

This method allows operations to throw IOException.

Type Parameters:

V - the type of the result

Parameters:

userTxn - the user-specified transaction, may be null

operations - the operations

Returns:

the result of the operations

Throws:

java.io.IOException - on I/O error

SDatabaseException - on error