[jira] Created: (WW-3204) Replace synchronized section in AnnotationActionValidatorManager.getValidators with a ReentrantReadWriteLock implementation

[Musachy Barroso (JIRA)]

Replace synchronized section in AnnotationActionValidatorManager.getValidators 
with a ReentrantReadWriteLock implementation
---------------------------------------------------------------------------------------------------------------------------

                 Key: WW-3204
                 URL: https://issues.apache.org/struts/browse/WW-3204
             Project: Struts 2
          Issue Type: Sub-task
    Affects Versions: 2.1.7
            Reporter: Musachy Barroso
            Assignee: Musachy Barroso
             Fix For: 2.1.8


something like:

lock.readLock().lock();
        try {
            if (validatorCache.containsKey(validatorKey)) {
                if (FileManager.isReloadingConfigs()) {
                    lock.writeLock().lock();
                    try {
                        if (validatorCache.containsKey(validatorKey))
                            validatorCache.put(validatorKey, 
buildValidatorConfigs(clazz, context, true, null));
                    } finally {
                        lock.writeLock().unlock();
                    }
                }
            } else {
                lock.writeLock().lock();
                try {
                    if (!validatorCache.containsKey(validatorKey))
                        validatorCache.put(validatorKey, 
buildValidatorConfigs(clazz, context, false, null));
                } finally {
                    lock.writeLock().unlock();
                }
            }
        } finally {
            lock.readLock().unlock();
        }

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