DisposableBeanAdapter.java 文件源码

/**
 * Search for all DestructionAwareBeanPostProcessors in the List.
 * @param processors the List to search
 * @return the filtered List of DestructionAwareBeanPostProcessors
 */
private List<DestructionAwareBeanPostProcessor> filterPostProcessors(List<BeanPostProcessor> processors, Object bean) {
    List<DestructionAwareBeanPostProcessor> filteredPostProcessors = null;
    if (!CollectionUtils.isEmpty(processors)) {
        filteredPostProcessors = new ArrayList<DestructionAwareBeanPostProcessor>(processors.size());
        for (BeanPostProcessor processor : processors) {
            if (processor instanceof DestructionAwareBeanPostProcessor) {
                DestructionAwareBeanPostProcessor dabpp = (DestructionAwareBeanPostProcessor) processor;
                try {
                    if (dabpp.requiresDestruction(bean)) {
                        filteredPostProcessors.add(dabpp);
                    }
                }
                catch (AbstractMethodError err) {
                    // A pre-4.3 third-party DestructionAwareBeanPostProcessor...
                    // As of 5.0, we can let requiresDestruction be a Java 8 default method which returns true.
                    filteredPostProcessors.add(dabpp);
                }
            }
        }
    }
    return filteredPostProcessors;
}