Challenge redislabs-training#4 solution and tests.

Author: Simon Prickett

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

@@ -59,7 +59,10 @@ public CapacityReport getReport(Integer limit) {
     @Override
     public Long getRank(Long siteId) {
         // START Challenge #4
-        return -2L;
+        try(Jedis jedis = jedisPool.getResource()) {
+            String key = RedisSchema.getCapacityRankingKey();
+            return jedis.zrevrank(key, String.valueOf(siteId));
+        }
         // 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);