http://docs.jboss.org/weld/reference/1.0.0/en-US/html_single/#d0e3997

This portion of the spec looks particularly interesting.  Seam has the concept of raising events and observing them via the @RaiseEvent and @Observer annotations.

It is possible in Seam to use the Events API as follows to raise an event:

Events.instance().raiseEvent("foo.bar");

Obviously this is not a typesafe solution so the CDI version has made this typesafe.

Is the other intention to allow more fine-grained control in terms of when the event is raised?

There are five kinds of transactional observers:

    *

      IN_PROGESS observers are called immediately (default)

      AFTER_SUCCESS observers are called during the after completion phase of the transaction, but only if the transaction completes successfully
    *

      AFTER_FAILURE observers are called during the after completion phase of the transaction, but only if the transaction fails to complete successfully
    *

      AFTER_COMPLETION observers are called during the after completion phase of the transaction
    *

      BEFORE_COMPLETION observers are called during the before completion phase of the transaction

Using this technique, we could do audit logging or error logging for tx's...  pretty cool...