Java 带有@Transactional 注释的多个事务管理器
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Multiple transaction managers with @Transactional annotation
提问by Seyran
We have base generic manager which is inherited by all managers. Base manager is annotated with @Transactional annotations.
There are 2 groups of transactional services:
x.y.service1.*- have to be managed bytransactionManager1x.y.service2.*- have to be managed bytransactionManager2
我们有由所有管理器继承的基本通用管理器。基本管理器使用@Transactional 注释进行注释。
有两组交易服务：
x.y.service1.*- 必须由管理transactionManager1x.y.service2.*- 必须由管理transactionManager2
How can transactions be configured without nessesity to override ALL transactional methods and specify transaction manager?
如何在不需要覆盖所有事务方法并指定事务管理器的情况下配置事务？
@Transactional(readOnly = true)
public abstract class GenericManagerImpl<D extends IGenericDao, T extends BaseObject, PK extends Serializable>
implements IGenericManager<T, PK> {
protected D dao;
@Autowired
public void setDao(D dao) {
this.dao = dao;
}
@Transactional(readOnly = false)
public void save(T object) {
dao.save(object);
}
@Transactional(readOnly = false)
public void remove(T object) {
dao.remove(object);
}
}
@Service
class UserManagerImpl
extends GenericManagerImpl<IUserDao, User, Long>
implements IUserManager {
// Everything is OK. User is managed by txManager1
}
@Service
class BillingManagerImpl
extends GenericManagerImpl<IBillingDao, Billing, Long>
implements IBillingManager {
@Override
@Transactional(readOnly = false, value="txManager2") // <--have to override method only to specify txManager
public void save(final Billing billing ) {
super.save(billing);
}
@Override
@Transactional(readOnly = false, value="txManager2") // <--have to override method only to specify txManager
public void remove(final Billing billing ) {
super.remove(billing);
}
}
Most probably i need to combine aop with @Transactional annotation.
Actually, what i want is:
1) To be able to configure transactions (read only flag, propogation, isolation etc) with @Transactional annotation.
2) define strategy to choose transaction manager outside of my classes (using AOP, for example)
x.y.service1.* -> use txManager1
x.y.service2.* -> use txManager2
很可能我需要将 aop 与 @Transactional 注释结合起来。
实际上，我想要的是：
1）能够使用@Transactional 注释配置事务（只读标志、传播、隔离等）。
2）定义策略以在我的类之外选择事务管理器（例如使用 AOP）
xyservice1.* -> 使用 txManager1
xyservice2.* -> 使用 txManager2
Is it possible?
是否可以？
回答by Bozho
I guess you can define @Transactionalat class-level
我想你可以@Transactional在类级别定义
@Service
@Transactional(readOnly = false, value="txManager2")
class BillingManagerImpl ....
回答by Sean Patrick Floyd
There is the possibility to create your own annotationsas shortcuts for @Transactional(value="tx1"). (These can be used at class or method level)
可以创建自己的注释作为@Transactional(value="tx1"). （这些可以在类或方法级别使用）
from the reference documentation:
从参考文档：
For example, defining the following annotations
例如，定义以下注解
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Transactional("order")
public @interface OrderTx {
}
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Transactional("account")
public @interface AccountTx {
}
allows us to write the example from the previous section as
允许我们将上一节中的示例编写为
public class TransactionalService {
@OrderTx
public void setSomething(String name) { ... }
@AccountTx
public void doSomething() { ... }
}
