Hi Timothy,
I have checked the content of the Aries Blog example. The example shows
How to inject transaction at the level of the DAO layer (= layer where
we define the mapping between the model and the Database).
My question is very simple : With Spring, it is possible to define
transactions at the Service layer instead of the DAO. In this case, it
is possible to initiate a transaction from a service to by example
insert address of a person (by calling the AddressDAO interface) AND
next inserting also the person in the DB (by calling the PersonDAO
interface). So, we use the same transaction to calls two different DAO
and entities. Is it possible to do that with Aries Transaction ?
Regards,
Charles
On 08/11/10 15:17, Timothy Ward wrote:
Hi,
It looks like you're trying to do Application-Managed JPA rather than
container-managed JPA with this example (i.e. you want to have an
EntityManagerFactory and manage the EntityManager lifecycle yourself).
In this case you can just inject the persistence unit directly into the bean
that wants it with e.g.
<bean id="persistenceBean" class="org.apache.Foo">
<jpa:unit unitname="camel" property="enitityManagerFactory"/>
</bean>
This encompasses all of the integration with global transactions as well as the
JPA injection via the setEntityManagerFactory method.
Managed transactions can be configured using the transactions namespace e.g.
<bean id="transacted" class="org.apache.Bar">
<tx:transaction/>
</bean>
This bean will have a "Required" transaction attribute for all public methods
invoked from outside the bean.
These two concepts are often used together with container-managed persistence
contexts (i.e you let the container manage the EntityManager lifecycle). There
are examples of this in the Blog sample.
<bean id="persistenceBean" class="org.apache.Foo">
<tx:transaction/>
<jpa:context unitname="camel" property="enitityManager"/>
</bean>
I hope this helps. If you'd like to put any of your experiences together it
would be great to start building some better documentation for the Aries JPA
component.
Regards,
Tim
----------------------------------------
Hi,
Do we have an example showing what we define like this in spring
<bean id="transactionTemplate"
class="org.springframework.transaction.support.TransactionTemplate">
<property name="transactionManager">
<bean class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory"/>
</bean>
</property>
</bean>
<bean id="jpaTemplate" class="org.springframework.orm.jpa.JpaTemplate">
<property name="entityManagerFactory" ref="entityManagerFactory"/>
</bean>
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
<property name="persistenceUnitName" value="camel"/>
</bean>
but using Aries JPA and Aries Transaction now ?
Regards,
Charles M.
Apache ServiceMix, Camel and Karaf committer
