Challenge redislabs-training#2 & 3 reviewed

Added key expiration in Challenge redislabs-training#2.
Added `try-with-resources` and use already initialised script in Chanllenge redislabs-training#3.

Author: J-A-I-L

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

@@ -53,7 +53,7 @@ private void insertMetric(Jedis jedis, long siteId, double value, MetricUnit uni
         Integer minuteOfDay = getMinuteOfDay(dateTime);
 
         jedis.zadd(metricKey, minuteOfDay, new MeasurementMinute(value, minuteOfDay).toString());
-
+        jedis.expire(metricKey, METRIC_EXPIRATION_SECONDS);
         // END Challenge #2
     }
 

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

@@ -81,20 +81,19 @@ private void updateBasic(Jedis jedis, String key, MeterReading reading) {
     // Challenge #3
     private void updateOptimized(Jedis jedis, String key, MeterReading reading) {
         // START Challenge #3
-        String reportingTime = ZonedDateTime.now(ZoneOffset.UTC).toString();
-
-        Transaction t = jedis.multi();
-        CompareAndUpdateScript script = new CompareAndUpdateScript(jedisPool);
+        try (Transaction t = jedis.multi()) {
+            String reportingTime = ZonedDateTime.now(ZoneOffset.UTC).toString();
 
-        t.hset(key, SiteStats.reportingTimeField, reportingTime);
-        t.hincrBy(key, SiteStats.countField, 1);
-        t.expire(key, weekSeconds);
+            t.hset(key, SiteStats.reportingTimeField, reportingTime);
+            t.hincrBy(key, SiteStats.countField, 1);
+            t.expire(key, weekSeconds);
 
-        script.updateIfGreater(t, key,  SiteStats.maxWhField, reading.getWhGenerated());
-        script.updateIfLess(t, key,  SiteStats.minWhField, reading.getWhGenerated());
-        script.updateIfGreater(t, key,  SiteStats.maxCapacityField, getCurrentCapacity(reading));
+            this.compareAndUpdateScript.updateIfGreater(t, key, SiteStats.maxWhField, reading.getWhGenerated());
+            this.compareAndUpdateScript.updateIfLess(t, key, SiteStats.minWhField, reading.getWhGenerated());
+            this.compareAndUpdateScript.updateIfGreater(t, key, SiteStats.maxCapacityField, getCurrentCapacity(reading));
 
-        t.exec();
+            t.exec();
+        }
         // END Challenge #3
     }