src-spring-framework

Spring Framework

History

Chris Beams a456a1a0e3 Improve annotation processing thread-safety Commit http://bit.ly/nXumTs ensured that component methods and fields marked with 'common annotations' such as @Resource, @PostConstruct and @PreDestroy are invoked/assigned once and only once, even if multiple instances of the CommonAnnotationBeanPostProcessor are processing the same bean factory. The implementation works against the InjectionMetadata API, adding and removing these members from sets that track whether they are already 'externally managed', i.e. that another CABPP has already handled them, thus avoiding redundant processing. Prior to this change, the #remove operations against these sets were not synchronized. In a single-threaded context this is fine thanks to logic in AbstractAutowireCapableBeanFactory#doCreateBean that checks to see whether a given bean definition has already been post processed. However, as reported by SPR-8598, certain cases involving multiple threads and annotated prototype-scoped beans can cause concurrent modification exceptions during the #remove operation (ostensibly because another thread is attempting to do the same removal at the same time, though this has yet to be reproduced in isolation). Now the sets originally introduced by the commit above are decorated with Collections#synchronizedSet and any iterations over those sets are synchronized properly. This change should have low performance impact as such processing happens at container startup time (save for non-singleton lookups at runtime), and there should be little contention in any case. Issue: SPR-8598		13 years ago
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src	Improve annotation processing thread-safety	13 years ago
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