synchronized method or use spring @transactional?

Question

I have a method that will be used to send out email. i want to lock this method so only one thread can accses it per time and the rest pool up concurrently. should i synchro

Answer 1

in Sping 3.0 you can use @Async annotation to do task execution, so your method will be executed later and the method is returned directly without waiting for email to be sent.

@Async
public  void sendThroughSMTP(List emails,String subject,String content){
//Send emails here, you can directly send lots of email
}

then in application context you specify and don't forget to add xmlns for task schema.

If you want to delay the execution for certain amount of time, you may use @Scheduled annotation to your method.

Further tutorial about @Async and @Scheduled can be found here :

http://blog.springsource.com/2010/01/05/task-scheduling-simplifications-in-spring-3-0/