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  * Copyright (c) 2013 GraphAware
  * This file is part of GraphAware.
  * GraphAware is free software: you can redistribute it and/or modify it under the terms of
  * the GNU General Public License as published by the Free Software Foundation, either
  * version 3 of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of
 * the GNU General Public License along with this program.  If not, see
 * <>.
package com.graphaware.tx.executor.single;
A TransactionCallback returning void.
public abstract class VoidReturningCallback implements TransactionCallback<Void> {

    public final Void doInTransaction(GraphDatabaseService database) {
        return null;

Perform the work. This method is guaranteed to run in the context of a transaction.

database on which to perform work and against which the transaction is running.
    protected abstract void doInTx(GraphDatabaseService database);
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