Performance Improvements

[oleg.zhurakousky]

I've filed https://jira.springsource.org/browse/INT-1903. Although we'll keep the same default id generation strategy (random UUID), we'll expose the strategy to be provided by the end user.

[justinmiller]

As an update, for anyone who's interested... in order to "change" the default algorithm used by the UUID class, I wrote a bean that will inject a new SecureRandom("SHA1PRNG") instance into the static numberGenerator field of UUID using reflection, upon application startup, as per Dave's suggestion.

It's ugly, but it seems to work. Is there a better way to set the default Provider for a SecureRandom instance? A java system property perhaps?

[oleg.zhurakousky]

As I stated before it will be handled as part of the https://jira.springsource.org/browse/INT-1903 shortly

[oleg.zhurakousky]

The issue has finally been addressed. See details here: https://jira.springsource.org/browse/INT-1903
IN the nutshell all you need to do is implement MessageHeaders.IdGenerator

public static interface IdGenerator {
	UUID generateId();
}

and configure it as a bean in the ApplicationContext

<bean class="foo.bar.MyIdGenerator"/>

Please see the resolution comment of https://jira.springsource.org/browse/INT-1903 for more details.

You can also check out this time-based UUID generator which gives you a 10-12 times performance boost with reasonable global uniqueness.
https://github.com/olegz/uuid