Challenge redislabs-training#4

Implement `getRAnk()` in `CapacityDaoRedisImplTest.java`.

Author: J-A-I-L

src/main/java/com/redislabs/university/RU102J/dao/CapacityDaoRedisImpl.java

@@ -59,7 +59,12 @@ public CapacityReport getReport(Integer limit) {
     @Override
     public Long getRank(Long siteId) {
         // START Challenge #4
-        return -2L;
+        String key = RedisSchema.getCapacityRankingKey();
+
+        try (Jedis jedis = jedisPool.getResource()) {
+            final Long rank = jedis.zrevrank(key, siteId.toString());
+            return rank;
+        }
         // END Challenge #4
     }
 }

src/test/java/com/redislabs/university/RU102J/dao/CapacityDaoRedisImplTest.java

@@ -71,7 +71,6 @@ public void getReport() {
     }
 
     // Challenge #4
-    @Ignore
     @Test
     public void getRank() {
         CapacityDao dao = new CapacityDaoRedisImpl(jedisPool);