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Spring Framework 2.0.5 API 文档英文版
TopLinkInterceptor (Spring Framework API 2.0) - Spring Framework 2.0.5 API 文档英文版
org.springframework.orm.toplink
Class TopLinkInterceptor
java.lang.Object
org.springframework.orm.toplink.TopLinkAccessor
org.springframework.orm.toplink.TopLinkInterceptor
- All Implemented Interfaces:
- Advice, Interceptor, MethodInterceptor, InitializingBean
public class TopLinkInterceptor
- extends TopLinkAccessor
- implements MethodInterceptor
This interceptor binds a new TopLink Session to the thread before a method
call, closing and removing it afterwards in case of any method outcome.
If there already is a pre-bound Session (e.g. from TopLinkTransactionManager,
or from a surrounding TopLink-intercepted method), the interceptor simply
takes part in it.
Application code must retrieve a TopLink Session via the
SessionFactoryUtils.getSession method or - preferably -
TopLink's own Session.getActiveSession() method, to be able to
detect a thread-bound Session. Typically, the code will look like as follows:
public void doSomeDataAccessAction() {
Session session = this.serverSession.getActiveSession();
...
}
Note that this interceptor automatically translates TopLinkExceptions,
via delegating to the
SessionFactoryUtils.convertTopLikAccessException
method that converts them to exceptions that are compatible with the
org.springframework.dao exception hierarchy (like TopLinkTemplate does).
This can be turned off if the raw exceptions are preferred.
This class can be considered a declarative alternative to TopLinkTemplate's
callback approach. The advantages are:
- no anonymous classes necessary for callback implementations;
- the possibility to throw any application exceptions from within data access code.
The drawback is the dependency on interceptor configuration. However, note
that this interceptor is usually not necessary in scenarios where the
data access code always executes within transactions. A transaction will always
have a thread-bound Session in the first place, so adding this interceptor to the
configuration just adds value when potentially executing outside of transactions
and/or when relying on exception translation.
- Since:
- 1.2
- Author:
- Juergen Hoeller
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
TopLinkInterceptor
public TopLinkInterceptor()
setExceptionConversionEnabled
public void setExceptionConversionEnabled(boolean exceptionConversionEnabled)
- Set whether to convert any TopLinkException raised to a Spring DataAccessException,
compatible with the
org.springframework.dao exception hierarchy.
Default is "true". Turn this flag off to let the caller receive raw exceptions
as-is, without any wrapping.
- See Also:
DataAccessException
invoke
public Object invoke(MethodInvocation methodInvocation)
throws Throwable
- Specified by:
invoke in interface MethodInterceptor
- Throws:
Throwable
Copyright © 2002-2007 The Spring Framework.
