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

Spring @Transactional is not quite correct used in your case. The best bet is using synchorized method and add some thread pooling if your method called by hundreds time. But i guess you dont need thread pool here.

If you use thread to send blast email, then what's point synchronizing the method? if one process call your method and send email, other process will call you method even the first sending email process not yet finish.

If you intent to throttle the email sending process, you need to condider a queue (collection) and protect the collection with synchronize block. Create another process to monitor that queue, if there is one item in queue, pop it and send blast email, then wait until sending email process finish and check again the queue, if there is any item, continue to sending email process. If no item in the queue, make the monitor thread sleep for some chunk of time, then if sleep time is finish check the queue again.