将ReadWriteLock应用于缓存设计

    private static final int DATA_OPERATION = 10;
    private static final int MAX = 10;
    private static String[] ids = new String[MAX];

    static {
        for(int i=0; i<MAX; i++) {
            ids[i] = UUID.randomUUID().toString();
        }
    }

    private Hit hit;
    private FullCache<ArticleCategory> cache;

    @Before
    public void setUp() {
        hit = new Hit();
        cache = new FullCache<ArticleCategory>() {
            @Override
            protected List<ArticleCategory> doGetList() {
                hit.notHit();
                List<ArticleCategory> list = new ArrayList<ArticleCategory>();
                for(int i=0; i<MAX; i++) {
                    ArticleCategory obj = new ArticleCategory();
                    obj.setId(ids[i]);
                    list.add(obj);
                }
                doSleep(DATA_OPERATION);
                return list;
            }

            @Override
            public List<ArticleCategory> getCachedList() {
                hit.total();
                return super.getCachedList();
            }
        };
    }

    @Test
    public void testMultiThread() {
        final int THREADS = 100;
        final int LOOP_PER_THREAD = 100000;
        List<Thread> threads = new ArrayList<Thread>(THREADS);
        // test FullCache.getCachedList(id):
        for(int i=0; i<THREADS; i++) {
            threads.add(
                    new Thread() {
                        public void run() {
                            for(int j=0; j<LOOP_PER_THREAD; j++) {
                                List<ArticleCategory> list = cache.getCachedList();
                                for(int k=0; k<MAX; k++) {
                                    assertEquals(ids[k], list.get(k).getId());
                                }
                            }
                        }
                    }
            );
        }