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/*
 * Copyright (c) 2009-2016, Data Geekery GmbH (http://www.datageekery.com)
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Other licenses:
 * -----------------------------------------------------------------------------
 * Commercial licenses for this work are available. These replace the above
 * ASL 2.0 and offer limited warranties, support, maintenance, and commercial
 * database integrations.
 *
 * For more information, please visit: http://www.jooq.org/licenses
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 */
package org.jooq;

import org.jooq.impl.ThreadLocalTransactionProvider;

/**
 * An FunctionalInterface that wraps transactional code.
 * 
 * This callable may depend on captured scope ("context") in order to discover a
 * contextual {@link Configuration} to be used to create new SQL statements.
 * Clients are responsible to implement such context state in appropriate
 * {@link ConnectionProvider} and {@link TransactionProvider} implementations.
 * 

 * An out-of-the-box implementation for a fitting {@link TransactionProvider} is
 * available through {@link ThreadLocalTransactionProvider}.
 *
 * @author Lukas Eder
 */

@FunctionalInterface

public interface ContextTransactionalCallable {

    /**
     * Run the transactional code.
     * 
     * If this method completes normally, and this is not a nested transaction,
     * then the transaction will be committed. If this method completes with an
     * exception, then the transaction is rolled back to the beginning of this
     * ContextTransactionalCallable.
     *
     * @return The outcome of the transaction.
     * @throws Exception Any exception that will cause a rollback of the code
     *             contained in this transaction. If this is a nested
     *             transaction, the rollback may be performed only to the state
     *             before executing this
     *             ContextTransactionalCallable.
     */
    T run() throws Exception;
}