Support @Order on ApplicationListeners [SPR-12410]

[spring-projects-issues]

Sam Brannen opened SPR-12410 and commented

Status Quo

AbstractApplicationEventMulticaster currently sorts ApplicationListener instances based on the Ordered interface, but the sorting algorithm does not honor annotations.

At the time of this writing, there are two invocations of OrderComparator.sort() within AbstractApplicationEventMulticaster.

Proposal

Refactor AbstractApplicationEventMulticaster to use AnnotationAwareOrderComparator.sort() instead of OrderComparator.sort().

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Affects: 3.0 GA

Issue Links:

• AbstractApplicationEventMulticaster does not sort listeners using @Order [SPR-10057] #14690 AbstractApplicationEventMulticaster does not sort listeners using @Order ("is duplicated by")
• ApplicationListener-like annotation for consuming application events [SPR-11622] #16245 ApplicationListener-like annotation for consuming application events
• @Order annotations not consistently honored within DispatcherServlet and other parts of the framework [SPR-12806] #17403 @Order annotations not consistently honored within DispatcherServlet and other parts of the framework

Referenced from: commits 8eb7bee

[spring-projects-issues]

Stéphane Nicoll commented

ApplicationListener implementations can now be ordered either using @Order or by implementing the Ordered interface.