final class PingPongTransaction implements FutureCallback<CommitInfo> {
private final DOMDataReadWriteTransaction delegate;
private final SettableFuture<CommitInfo> future;
private DOMDataReadWriteTransaction frontendTransaction;
PingPongTransaction(final DOMDataReadWriteTransaction delegate) {
final class PingPongTransaction implements FutureCallback<CommitInfo> {
private final DOMDataReadWriteTransaction delegate;
private final SettableFuture<CommitInfo> future;
private DOMDataReadWriteTransaction frontendTransaction;
PingPongTransaction(final DOMDataReadWriteTransaction delegate) {