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Spring Framework example source code file (TransactionDefinition.java)

This example Spring Framework source code file (TransactionDefinition.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

isolation_default, isolation_default, isolation_read_committed, isolation_read_committed, isolation_repeatable_read, isolation_serializable, jdbc, propagation_nested, propagation_not_supported, propagation_required, propagation_requires_new, propagation_supports, sql, string, timeout_default, transactiondefinition

The Spring Framework TransactionDefinition.java source code

/*
 * Copyright 2002-2006 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
 *
 *      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.
 */

package org.springframework.transaction;

import java.sql.Connection;

/**
 * Interface that defines Spring-compliant transaction properties.
 * Based on the propagation behavior definitions analogous to EJB CMT attributes.
 *
 * <p>Note that isolation level and timeout settings will not get applied unless
 * an actual new transaction gets started. As only {@link #PROPAGATION_REQUIRED},
 * {@link #PROPAGATION_REQUIRES_NEW} and {@link #PROPAGATION_NESTED} can cause
 * that, it usually doesn't make sense to specify those settings in other cases.
 * Furthermore, be aware that not all transaction managers will support those
 * advanced features and thus might throw corresponding exceptions when given
 * non-default values.
 *
 * <p>The {@link #isReadOnly() read-only flag} applies to any transaction context,
 * whether backed by an actual resource transaction or operating non-transactionally
 * at the resource level. In the latter case, the flag will only apply to managed
 * resources within the application, such as a Hibernate <code>Session.
 *
 * @author Juergen Hoeller
 * @since 08.05.2003
 * @see PlatformTransactionManager#getTransaction(TransactionDefinition)
 * @see org.springframework.transaction.support.DefaultTransactionDefinition
 * @see org.springframework.transaction.interceptor.TransactionAttribute
 */
public interface TransactionDefinition {

	/**
	 * Support a current transaction; create a new one if none exists.
	 * Analogous to the EJB transaction attribute of the same name.
	 * <p>This is typically the default setting of a transaction definition,
	 * and typically defines a transaction synchronization scope.
	 */
	int PROPAGATION_REQUIRED = 0;

	/**
	 * Support a current transaction; execute non-transactionally if none exists.
	 * Analogous to the EJB transaction attribute of the same name.
	 * <p>NOTE: For transaction managers with transaction synchronization,
	 * <code>PROPAGATION_SUPPORTS is slightly different from no transaction
	 * at all, as it defines a transaction scope that synchronization might apply to.
	 * As a consequence, the same resources (a JDBC <code>Connection, a
	 * Hibernate <code>Session, etc) will be shared for the entire specified
	 * scope. Note that the exact behavior depends on the actual synchronization
	 * configuration of the transaction manager!
	 * <p>In general, use PROPAGATION_SUPPORTS with care! In particular, do
	 * not rely on <code>PROPAGATION_REQUIRED or PROPAGATION_REQUIRES_NEW
	 * <i>within a PROPAGATION_SUPPORTS scope (which may lead to
	 * synchronization conflicts at runtime). If such nesting is unavoidable, make sure
	 * to configure your transaction manager appropriately (typically switching to
	 * "synchronization on actual transaction").
	 * @see org.springframework.transaction.support.AbstractPlatformTransactionManager#setTransactionSynchronization
	 * @see org.springframework.transaction.support.AbstractPlatformTransactionManager#SYNCHRONIZATION_ON_ACTUAL_TRANSACTION
	 */
	int PROPAGATION_SUPPORTS = 1;

	/**
	 * Support a current transaction; throw an exception if no current transaction
	 * exists. Analogous to the EJB transaction attribute of the same name.
	 * <p>Note that transaction synchronization within a PROPAGATION_MANDATORY
	 * scope will always be driven by the surrounding transaction.
	 */
	int PROPAGATION_MANDATORY = 2;

	/**
	 * Create a new transaction, suspending the current transaction if one exists.
	 * Analogous to the EJB transaction attribute of the same name.
	 * <p>NOTE: Actual transaction suspension will not work out-of-the-box
	 * on all transaction managers. This in particular applies to
	 * {@link org.springframework.transaction.jta.JtaTransactionManager},
	 * which requires the <code>javax.transaction.TransactionManager
	 * to be made available it to it (which is server-specific in standard J2EE).
	 * <p>A PROPAGATION_REQUIRES_NEW scope always defines its own
	 * transaction synchronizations. Existing synchronizations will be suspended
	 * and resumed appropriately.
	 * @see org.springframework.transaction.jta.JtaTransactionManager#setTransactionManager
	 */
	int PROPAGATION_REQUIRES_NEW = 3;

	/**
	 * Do not support a current transaction; rather always execute non-transactionally.
	 * Analogous to the EJB transaction attribute of the same name.
	 * <p>NOTE: Actual transaction suspension will not work out-of-the-box
	 * on all transaction managers. This in particular applies to
	 * {@link org.springframework.transaction.jta.JtaTransactionManager},
	 * which requires the <code>javax.transaction.TransactionManager
	 * to be made available it to it (which is server-specific in standard J2EE).
	 * <p>Note that transaction synchronization is not available within a
	 * <code>PROPAGATION_NOT_SUPPORTED scope. Existing synchronizations
	 * will be suspended and resumed appropriately.
	 * @see org.springframework.transaction.jta.JtaTransactionManager#setTransactionManager
	 */
	int PROPAGATION_NOT_SUPPORTED = 4;

	/**
	 * Do not support a current transaction; throw an exception if a current transaction
	 * exists. Analogous to the EJB transaction attribute of the same name.
	 * <p>Note that transaction synchronization is not available within a
	 * <code>PROPAGATION_NEVER scope.
	 */
	int PROPAGATION_NEVER = 5;

	/**
	 * Execute within a nested transaction if a current transaction exists,
	 * behave like {@link #PROPAGATION_REQUIRED} else. There is no analogous
	 * feature in EJB.
	 * <p>NOTE: Actual creation of a nested transaction will only work on specific
	 * transaction managers. Out of the box, this only applies to the JDBC
	 * {@link org.springframework.jdbc.datasource.DataSourceTransactionManager}
	 * when working on a JDBC 3.0 driver. Some JTA providers might support
	 * nested transactions as well.
	 * @see org.springframework.jdbc.datasource.DataSourceTransactionManager
	 */
	int PROPAGATION_NESTED = 6;


	/**
	 * Use the default isolation level of the underlying datastore.
	 * All other levels correspond to the JDBC isolation levels.
	 * @see java.sql.Connection
	 */
	int ISOLATION_DEFAULT = -1;

	/**
	 * Indicates that dirty reads, non-repeatable reads and phantom reads
	 * can occur.
	 * <p>This level allows a row changed by one transaction to be read by
	 * another transaction before any changes in that row have been committed
	 * (a "dirty read"). If any of the changes are rolled back, the second
	 * transaction will have retrieved an invalid row.
	 * @see java.sql.Connection#TRANSACTION_READ_UNCOMMITTED
	 */
	int ISOLATION_READ_UNCOMMITTED = Connection.TRANSACTION_READ_UNCOMMITTED;

	/**
	 * Indicates that dirty reads are prevented; non-repeatable reads and
	 * phantom reads can occur.
	 * <p>This level only prohibits a transaction from reading a row
	 * with uncommitted changes in it.
	 * @see java.sql.Connection#TRANSACTION_READ_COMMITTED
	 */
	int ISOLATION_READ_COMMITTED = Connection.TRANSACTION_READ_COMMITTED;

	/**
	 * Indicates that dirty reads and non-repeatable reads are prevented;
	 * phantom reads can occur.
	 * <p>This level prohibits a transaction from reading a row with
	 * uncommitted changes in it, and it also prohibits the situation
	 * where one transaction reads a row, a second transaction alters
	 * the row, and the first transaction rereads the row, getting
	 * different values the second time (a "non-repeatable read").
	 * @see java.sql.Connection#TRANSACTION_REPEATABLE_READ
	 */
	int ISOLATION_REPEATABLE_READ = Connection.TRANSACTION_REPEATABLE_READ;

	/**
	 * Indicates that dirty reads, non-repeatable reads and phantom reads
	 * are prevented.
	 * <p>This level includes the prohibitions in
	 * {@link #ISOLATION_REPEATABLE_READ} and further prohibits the
	 * situation where one transaction reads all rows that satisfy a
	 * <code>WHERE condition, a second transaction inserts a
	 * row that satisfies that <code>WHERE condition, and the
	 * first transaction rereads for the same condition, retrieving
	 * the additional "phantom" row in the second read.
	 * @see java.sql.Connection#TRANSACTION_SERIALIZABLE
	 */
	int ISOLATION_SERIALIZABLE = Connection.TRANSACTION_SERIALIZABLE;


	/**
	 * Use the default timeout of the underlying transaction system,
	 * or none if timeouts are not supported. 
	 */
	int TIMEOUT_DEFAULT = -1;


	/**
	 * Return the propagation behavior.
	 * <p>Must return one of the PROPAGATION_XXX constants
	 * defined on {@link TransactionDefinition this interface}.
	 * @return the propagation behavior
	 * @see #PROPAGATION_REQUIRED
	 * @see org.springframework.transaction.support.TransactionSynchronizationManager#isActualTransactionActive()
	 */
	int getPropagationBehavior();

	/**
	 * Return the isolation level.
	 * <p>Must return one of the ISOLATION_XXX constants
	 * defined on {@link TransactionDefinition this interface}.
	 * <p>Only makes sense in combination with {@link #PROPAGATION_REQUIRED}
	 * or {@link #PROPAGATION_REQUIRES_NEW}.
	 * <p>Note that a transaction manager that does not support custom
	 * isolation levels will throw an exception when given any other level
	 * than {@link #ISOLATION_DEFAULT}.
	 * @return the isolation level
	 */
	int getIsolationLevel();

	/**
	 * Return the transaction timeout.
	 * <p>Must return a number of seconds, or {@link #TIMEOUT_DEFAULT}.
	 * <p>Only makes sense in combination with {@link #PROPAGATION_REQUIRED}
	 * or {@link #PROPAGATION_REQUIRES_NEW}.
	 * <p>Note that a transaction manager that does not support timeouts
	 * will throw an exception when given any other timeout than
	 * {@link #TIMEOUT_DEFAULT}.
	 * @return the transaction timeout
	 */
	int getTimeout();

	/**
	 * Return whether to optimize as a read-only transaction.
	 * <p>The read-only flag applies to any transaction context, whether
	 * backed by an actual resource transaction
	 * ({@link #PROPAGATION_REQUIRED}/{@link #PROPAGATION_REQUIRES_NEW}) or
	 * operating non-transactionally at the resource level
	 * ({@link #PROPAGATION_SUPPORTS}). In the latter case, the flag will
	 * only apply to managed resources within the application, such as a
	 * Hibernate <code>Session.
	 * <p>This just serves as a hint for the actual transaction subsystem;
	 * it will <i>not necessarily cause failure of write access attempts.
	 * A transaction manager that cannot interpret the read-only hint will
	 * <i>not throw an exception when asked for a read-only transaction.
	 * @return <code>true if the transaction is to be optimized as read-only 
	 * @see org.springframework.transaction.support.TransactionSynchronization#beforeCommit(boolean)
	 * @see org.springframework.transaction.support.TransactionSynchronizationManager#isCurrentTransactionReadOnly()
	 */
	boolean isReadOnly();

	/**
	 * Return the name of this transaction. Can be <code>null.
	 * <p>This will be used as the transaction name to be shown in a
	 * transaction monitor, if applicable (for example, WebLogic's).
	 * <p>In case of Spring's declarative transactions, the exposed name
	 * must (and will) be the
	 * <code>fully-qualified class name + "." + method name
	 * (by default).
	 * @return the name of this transaction
	 * @see org.springframework.transaction.interceptor.TransactionAspectSupport
	 * @see org.springframework.transaction.support.TransactionSynchronizationManager#getCurrentTransactionName()
	 */
	String getName();

}

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