Callback functions in the Hibernatetemplate

Source: Internet
Author: User

Callback Functions in Hibernatetemplate: You can see that all operational implementations of the database in the Hibernatetemplate class are using callback functions
Hibernatetemplate callback function source code:

Public <T> T Execute (hibernatecallback<t> action) throws DataAccessException {
Return Doexecute (action, false);

}

Public <T> T executewithnativesession (hibernatecallback<t> action) {
Return Doexecute (action, true);
}


Analysis: Callback Letter Understanding: Call the Doexecute method in execute or executewithnativesession and pass the action as a parameter, and invoke the method in action in the Doexecute method
Parameter hibernatecallback<t> is an interface with only one doinhibernate (Session session) method, which can be implemented by creating an anonymous inner class in the form of doinhibernate ( Session session) Implement the specific logic in this method

The Doexecute method calls the Doinhibernate (Session session) method in the function Hibernatecallback, which is used to get a session and pass it into the Doinhibernate method Return Action.doinhibernate (Sessiontoexpose) is returned, and the return value from the Doinhibernate method in the class you implement is returned

Method The difference between execute executewithnativesession:
The Execute method uses the session proxy executewithnativesession to use the native session
Public interface Hibernatecallback<t> {
T Doinhibernate (Session session) throws Hibernateexception;
}

Protected <T> T Doexecute (hibernatecallback<t> action, Boolean enforcenativesession) throws DataAccessException {
Assert.notnull (Action, "Callback object must not is null");

Session session = NULL;
Boolean isnew = false;
try {
Session = Getsessionfactory (). Getcurrentsession ();
}
catch (Hibernateexception ex) {
Logger.debug ("Could not retrieve Pre-bound Hibernate session", ex);
}
if (session = = null) {
Session = Getsessionfactory (). Opensession ();
Session.setflushmode (flushmode.manual);
IsNew = true;
}

try {
Enablefilters (session);
Session Sessiontoexpose =
(Enforcenativesession | | isexposenativesession () session:createsessionproxy (session));
Return Action.doinhibernate (Sessiontoexpose);
}
catch (Hibernateexception ex) {
Throw Sessionfactoryutils.converthibernateaccessexception (ex);
}
catch (RuntimeException ex) {
Callback code threw application exception ...
Throw ex;
}
finally {
if (isnew) {
Sessionfactoryutils.closesession (session);
}
else {
Disablefilters (session);
}
}
}

Callback functions in the Hibernatetemplate

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.