org.springframework.transaction.support.TransactionOperations.java Source code

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Here is the source code for org.springframework.transaction.support.TransactionOperations.java

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/*
 * Copyright 2002-2019 the original author or authors.
 *
 * 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
 *
 *      https://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.
 */

package org.springframework.transaction.support;

import org.springframework.lang.Nullable;
import org.springframework.transaction.TransactionException;

/**
 * Interface specifying basic transaction execution operations.
 * Implemented by {@link TransactionTemplate}. Not often used directly,
 * but a useful option to enhance testability, as it can easily be
 * mocked or stubbed.
 *
 * @author Juergen Hoeller
 * @since 2.0.4
 */
public interface TransactionOperations {

    /**
     * Execute the action specified by the given callback object within a transaction.
     * <p>Allows for returning a result object created within the transaction, that is,
     * a domain object or a collection of domain objects. A RuntimeException thrown
     * by the callback is treated as a fatal exception that enforces a rollback.
     * Such an exception gets propagated to the caller of the template.
     * @param action the callback object that specifies the transactional action
     * @return a result object returned by the callback, or {@code null} if none
     * @throws TransactionException in case of initialization, rollback, or system errors
     * @throws RuntimeException if thrown by the TransactionCallback
     */
    @Nullable
    <T> T execute(TransactionCallback<T> action) throws TransactionException;

    /**
     * Execute the action specified by the given {@link Runnable} within a transaction.
     * <p>If you need to return an object from the callback or access the
     * {@link org.springframework.transaction.TransactionStatus} from within the callback,
     * use {@link #execute(TransactionCallback)} instead.
     * <p>This variant is analogous to using a {@link TransactionCallbackWithoutResult}
     * but with a simplified signature for common cases - and conveniently usable with
     * Java 8 lambda expressions.
     * @param action the Runnable that specifies the transactional action
     * @throws TransactionException in case of initialization, rollback, or system errors
     * @throws RuntimeException if thrown by the Runnable
     * @since 5.2
     * @see #execute(TransactionCallback)
     * @see TransactionCallbackWithoutResult
     */
    default void execute(Runnable action) throws TransactionException {
        execute(status -> {
            action.run();
            return null;
        });
    }

    /**
     * Return an implementation of the {@code TransactionOperations} interface which
     * executes a given {@link TransactionCallback} without an actual transaction.
     * <p>Useful for testing: The behavior is equivalent to running with a
     * transaction manager with no actual transaction (PROPAGATION_SUPPORTS)
     * and no synchronization (SYNCHRONIZATION_NEVER).
     * <p>For a {@link TransactionOperations} implementation with actual
     * transaction processing, use {@link TransactionTemplate} with an appropriate
     * {@link org.springframework.transaction.PlatformTransactionManager}.
     * @since 5.2
     * @see org.springframework.transaction.TransactionDefinition#PROPAGATION_SUPPORTS
     * @see AbstractPlatformTransactionManager#SYNCHRONIZATION_NEVER
     * @see TransactionTemplate
     */
    static TransactionOperations withoutTransaction() {
        return WithoutTransactionOperations.INSTANCE;
    }

}