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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
 * <http://www.gnu.org/licenses/>.
 */
package com.graphaware.tx.executor.single;
A convenience class that executes work in the context of a org.neo4j.graphdb.Transaction.

This class is thread-safe.

public class SimpleTransactionExecutor implements TransactionExecutor {
    private final GraphDatabaseService database;

    
Construct a new executor.

Parameters:
database against which transactions will be executed.
        this. = database;
    }

    
    @Override
    public <T> T executeInTransaction(TransactionCallback<T> callback) {
        return executeInTransaction(callback, RethrowException.getInstance());
    }

    
    @Override
    public <T> T executeInTransaction(TransactionCallback<T> callbackExceptionHandlingStrategy exceptionHandlingStrategy) {
        T result = null;
        try {
            result = doExecuteInTransaction(callback);
        } catch (RuntimeException e) {
            exceptionHandlingStrategy.handleException(e);
        }
        return result;
    }
    private <T> T doExecuteInTransaction(TransactionCallback<T> callback) {
        Transaction tx = .beginTx();
        T result = null;
        try {
            result = callback.doInTransaction(); //can throw a business exception
            tx.success();
        } catch (RuntimeException e) {
            tx.failure();
            throw e;
        } catch (Exception e) {
            tx.failure();
            throw new RuntimeException(e);
        } finally {
            tx.close(); //can throw a DB exception
        }
        return result;
    }
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