spring事务@Transactional的源码

/*
* Copyright 2002-2015 the original author or authors.//===============
*　　2002 - 2015年版权所有作者或作者
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
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package org.springframework.transaction.annotation;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import org.springframework.core.annotation.AliasFor;
import org.springframework.transaction.TransactionDefinition;

/**
* Describes transaction attributes on a method or class.

//===================描述方法或类中的事务属性。
*
* This annotation type is generally directly comparable to Spring's//==这种注释类型通常可以直接与Spring相媲美
* {@link org.springframework.transaction.interceptor.RuleBasedTransactionAttribute}
* class, and in fact {@link AnnotationTransactionAttributeSource} will directly
* convert the data to the latter class, so that Spring's transaction support code
* does not have to know about annotations. If no rules are relevant to the exception,
* it will be treated like
* {@link org.springframework.transaction.interceptor.DefaultTransactionAttribute}
* (rolling back on runtime exceptions).
*
* For specific information about the semantics of this annotation's attributes,
* consult the {@link org.springframework.transaction.TransactionDefinition} and
* {@link org.springframework.transaction.interceptor.TransactionAttribute} javadocs.
*
* @author Colin Sampaleanu
* @author Juergen Hoeller
* @author Sam Brannen
* @since 1.2
* @see org.springframework.transaction.interceptor.TransactionAttribute
* @see org.springframework.transaction.interceptor.DefaultTransactionAttribute
* @see org.springframework.transaction.interceptor.RuleBasedTransactionAttribute
*/
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Inherited
@Documented
public @interface Transactional {

 /**
 * Alias for {@link #transactionManager}.
 * @see #transactionManager
 */
 @AliasFor("transactionManager")
 String value() default "";

 /**
 * A qualifier value for the specified transaction.
 * May be used to determine the target transaction manager,
 * matching the qualifier value (or the bean name) of a specific
 * {@link org.springframework.transaction.PlatformTransactionManager}
 * bean definition.
 * @since 4.2
 * @see #value
 */
 @AliasFor("value")
 String transactionManager() default "";

 /**
 * The transaction propagation type.
 * Defaults to {@link Propagation#REQUIRED}.
 * @see org.springframework.transaction.interceptor.TransactionAttribute#getPropagationBehavior()
 */
 Propagation propagation() default Propagation.REQUIRED;

 /**
 * The transaction isolation level.
 * Defaults to {@link Isolation#DEFAULT}.
 * @see org.springframework.transaction.interceptor.TransactionAttribute#getIsolationLevel()
 */
 Isolation isolation() default Isolation.DEFAULT;

 /**
 * The timeout for this transaction.
 * Defaults to the default timeout of the underlying transaction system.
 * @see org.springframework.transaction.interceptor.TransactionAttribute#getTimeout()
 */
 int timeout() default TransactionDefinition.TIMEOUT_DEFAULT;

 /**
 * {@code true} if the transaction is read-only.
 * Defaults to {@code false}.
 * This just serves as a hint for the actual transaction subsystem;
 * it will not necessarily cause failure of write access attempts.
 * A transaction manager which cannot interpret the read-only hint will
 * not throw an exception when asked for a read-only transaction.
 * @see org.springframework.transaction.interceptor.TransactionAttribute#isReadOnly()
 */
 boolean readOnly() default false;

 /**
 * Defines zero (0) or more exception {@link Class classes}, which must be
 * subclasses of {@link Throwable}, indicating which exception types must cause
 * a transaction rollback.
 * This is the preferred way to construct a rollback rule (in contrast to
 * {@link #rollbackForClassName}), matching the exception class and its subclasses.
 * Similar to {@link org.springframework.transaction.interceptor.RollbackRuleAttribute#RollbackRuleAttribute(Class clazz)}
 * @see #rollbackForClassName
 */
 Class<? extends Throwable>[] rollbackFor() default {};

 /**
 * Defines zero (0) or more exception names (for exceptions which must be a
 * subclass of {@link Throwable}), indicating which exception types must cause
 * a transaction rollback.
 * This can be a substring of a fully qualified class name, with no wildcard
 * support at present. For example, a value of {@code "ServletException"} would
 * match {@link javax.servlet.ServletException} and its subclasses.
 * NB: Consider carefully how specific the pattern is and whether
 * to include package information (which isn't mandatory). For example,
 * {@code "Exception"} will match nearly anything and will probably hide other
 * rules. {@code "java.lang.Exception"} would be correct if {@code "Exception"}
 * were meant to define a rule for all checked exceptions. With more unusual
 * {@link Exception} names such as {@code "BaseBusinessException"} there is no
 * need to use a FQN.
 * Similar to {@link org.springframework.transaction.interceptor.RollbackRuleAttribute#RollbackRuleAttribute(String exceptionName)}
 * @see #rollbackFor
 */
 String[] rollbackForClassName() default {};

 /**
 * Defines zero (0) or more exception {@link Class Classes}, which must be
 * subclasses of {@link Throwable}, indicating which exception types must
 * not cause a transaction rollback.
 * This is the preferred way to construct a rollback rule (in contrast
 * to {@link #noRollbackForClassName}), matching the exception class and
 * its subclasses.
 * Similar to {@link org.springframework.transaction.interceptor.NoRollbackRuleAttribute#NoRollbackRuleAttribute(Class clazz)}
 * @see #noRollbackForClassName
 */
 Class<? extends Throwable>[] noRollbackFor() default {};

 /**
 * Defines zero (0) or more exception names (for exceptions which must be a
 * subclass of {@link Throwable}) indicating which exception types must not
 * cause a transaction rollback.
 * See the description of {@link #rollbackForClassName} for further
 * information on how the specified names are treated.
 * Similar to {@link org.springframework.transaction.interceptor.NoRollbackRuleAttribute#NoRollbackRuleAttribute(String exceptionName)}
 * @see #noRollbackFor
 */
 String[] noRollbackForClassName() default {};

}