rawlinp commented on a change in pull request #2785: In Traffic Router Support 
Snapshots which only update Delivery Services
URL: https://github.com/apache/trafficcontrol/pull/2785#discussion_r239933601
 
 

 ##########
 File path: 
traffic_router/core/src/main/java/com/comcast/cdn/traffic_control/traffic_router/core/config/ConfigHandler.java
 ##########
 @@ -15,63 +15,72 @@
 
 package com.comcast.cdn.traffic_control.traffic_router.core.config;
 
-import java.io.IOException;
-import java.net.UnknownHostException;
-import java.net.URL;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Date;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-import java.util.TreeSet;
-import java.util.Iterator;
-import java.util.concurrent.BlockingQueue;
-import java.util.concurrent.atomic.AtomicBoolean;
-import java.util.stream.Collectors;
-
+import com.comcast.cdn.traffic_control.traffic_router.core.cache.Cache;
+import 
com.comcast.cdn.traffic_control.traffic_router.core.cache.Cache.DeliveryServiceReference;
+import com.comcast.cdn.traffic_control.traffic_router.core.cache.CacheLocation;
+import com.comcast.cdn.traffic_control.traffic_router.core.cache.CacheRegister;
+import com.comcast.cdn.traffic_control.traffic_router.core.ds.DeliveryService;
+import 
com.comcast.cdn.traffic_control.traffic_router.core.ds.DeliveryServiceMatcher;
+import 
com.comcast.cdn.traffic_control.traffic_router.core.ds.DeliveryServiceMatcher.Type;
 import com.comcast.cdn.traffic_control.traffic_router.core.ds.SteeringWatcher;
+import com.comcast.cdn.traffic_control.traffic_router.core.loc.AnonymousIp;
+import 
com.comcast.cdn.traffic_control.traffic_router.core.loc.AnonymousIpConfigUpdater;
+import 
com.comcast.cdn.traffic_control.traffic_router.core.loc.AnonymousIpDatabaseUpdater;
+import 
com.comcast.cdn.traffic_control.traffic_router.core.loc.DeepNetworkUpdater;
 import 
com.comcast.cdn.traffic_control.traffic_router.core.loc.FederationsWatcher;
 import 
com.comcast.cdn.traffic_control.traffic_router.core.loc.GeolocationDatabaseUpdater;
 import com.comcast.cdn.traffic_control.traffic_router.core.loc.NetworkNode;
 import com.comcast.cdn.traffic_control.traffic_router.core.loc.NetworkUpdater;
-import 
com.comcast.cdn.traffic_control.traffic_router.core.loc.DeepNetworkUpdater;
 import 
com.comcast.cdn.traffic_control.traffic_router.core.loc.RegionalGeoUpdater;
-
+import 
com.comcast.cdn.traffic_control.traffic_router.core.monitor.TrafficMonitorWatcher;
+import com.comcast.cdn.traffic_control.traffic_router.core.request.HTTPRequest;
+import com.comcast.cdn.traffic_control.traffic_router.core.router.StatTracker;
+import 
com.comcast.cdn.traffic_control.traffic_router.core.router.TrafficRouterManager;
 import 
com.comcast.cdn.traffic_control.traffic_router.core.secure.CertificatesPoller;
 import 
com.comcast.cdn.traffic_control.traffic_router.core.secure.CertificatesPublisher;
 import com.comcast.cdn.traffic_control.traffic_router.core.util.JsonUtils;
 import 
com.comcast.cdn.traffic_control.traffic_router.core.util.JsonUtilsException;
+import 
com.comcast.cdn.traffic_control.traffic_router.core.util.TrafficOpsUtils;
+import com.comcast.cdn.traffic_control.traffic_router.geolocation.Geolocation;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import org.apache.log4j.Logger;
 
-import com.comcast.cdn.traffic_control.traffic_router.core.cache.Cache;
-import com.comcast.cdn.traffic_control.traffic_router.core.cache.CacheLocation;
-import com.comcast.cdn.traffic_control.traffic_router.core.cache.CacheRegister;
-import 
com.comcast.cdn.traffic_control.traffic_router.core.cache.Cache.DeliveryServiceReference;
-import com.comcast.cdn.traffic_control.traffic_router.core.ds.DeliveryService;
-import 
com.comcast.cdn.traffic_control.traffic_router.core.ds.DeliveryServiceMatcher;
-import 
com.comcast.cdn.traffic_control.traffic_router.core.ds.DeliveryServiceMatcher.Type;
-import 
com.comcast.cdn.traffic_control.traffic_router.core.monitor.TrafficMonitorWatcher;
-import 
com.comcast.cdn.traffic_control.traffic_router.core.router.TrafficRouterManager;
-import 
com.comcast.cdn.traffic_control.traffic_router.core.util.TrafficOpsUtils;
-import com.comcast.cdn.traffic_control.traffic_router.core.router.StatTracker;
-import com.comcast.cdn.traffic_control.traffic_router.geolocation.Geolocation;
-import com.comcast.cdn.traffic_control.traffic_router.core.request.HTTPRequest;
-import com.comcast.cdn.traffic_control.traffic_router.core.loc.AnonymousIp;
-import 
com.comcast.cdn.traffic_control.traffic_router.core.loc.AnonymousIpConfigUpdater;
-import 
com.comcast.cdn.traffic_control.traffic_router.core.loc.AnonymousIpDatabaseUpdater;
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.UnknownHostException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.TreeSet;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
 
 @SuppressWarnings("PMD.TooManyFields")
 public class ConfigHandler {
        private static final Logger LOGGER = 
Logger.getLogger(ConfigHandler.class);
 
        private static long lastSnapshotTimestamp = 0;
-       private static Object configSync = new Object();
-       private static String deliveryServicesKey = "deliveryServices";
+       private static final Object configSync = new Object();
+       final static String contentServersKey = "contentServers";
 
 Review comment:
   Can you capitalize+snake case these constants names to make it more obvious 
they're constants?

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