[ https://issues.jboss.org/browse/CDI-729?page=com.atlassian.jira.plugin.sy... ] James Roper commented on CDI-729: --------------------------------- Not sure that I understand, are you saying that what I described above is already supported today? Because, at least according to the Weld documentation, the only thing an observer can return today is {{void}}. And for back pressure, sure, the CDI implementation might be fast, but if an event handler is doing an operation on a database or remote service, and that is overloaded and taking 10 seconds to respond, how can that backpressure be propagated back to the thing that fired the event so that it doesn't continue firing events and increase the load on the already overloaded slow component? Currently, the only way is for the consumer to block the thread it's running on, that's not asynchronous. -- This message was sent by Atlassian JIRA (v7.5.0#75005)