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由 Nikita Tovstoles 提交于
Prior to this change, Spring's MethodParameter#getParameterAnnotations called java.lang.Method#getParameterAnnotations on every invocation. The latter ends up contending for a monitor inside (Sun) JDK code. This is problematic when dealing with the high number of @RequestMapping invocations that can occur in a Spring MVC @Controller. This commit eliminates this contention by caching values returned by java.lang.Method#getParameterAnnotations in a static ConcurrentMap. Note that only Method parameter annotations are cached, while Constructor parameter annotations are not. This is because the issue of primary concern is, as mentioned above, @RequestMapping methods. By nature, constructors are called much more infrequently, and in most cases in a single-threaded fashion. Issue: SPR-9298
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