Code example for ConcurrentMap

Methods: isEmpty

        return cache.size();
    public synchronized boolean isEmpty() { 
        return cache.isEmpty();
    public boolean isDiskCacheEnabled() { 
        return isDiskCacheEnabled;
     * Retrieves the list of files that are currently cached to disk. Guarantees to never return 
     * null. 
     * @return the list of files on disk 
    public List<File> getCachedFiles() {
        File[] cachedFiles = new File(diskCacheDirectory).listFiles();
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