chore: add pmd unusedcode (sofastack#259)

pom.xml

@@ -477,7 +477,7 @@
                         <ruleset>${main.user.dir}/ruleset.xml</ruleset>
                     </rulesets>
                     <excludes>
-                        <exclude>**/FixClassTypeResolver.java</exclude>
+                        <exclude>**/client/pb/*.*</exclude>
                     </excludes>
                     <failurePriority>2</failurePriority>
                 </configuration>

ruleset.xml

@@ -22,4 +22,7 @@
     <rule ref="rulesets/java/ali-orm.xml"/>
     <rule ref="rulesets/java/ali-other.xml"/>
     <rule ref="rulesets/java/ali-set.xml"/>
+    <rule ref="rulesets/java/unusedcode.xml">
+        <priority>2</priority>
+    </rule>
 </ruleset>

server/server/session/src/main/java/com/alipay/sofa/registry/server/session/push/PushTrace.java

@@ -42,7 +42,6 @@ public final class PushTrace {
       Hack.hackLoggerDisruptor(LoggerFactory.getLogger("PUSH-TRACE"));
   private static final Logger SLOW_LOGGER =
       Hack.hackLoggerDisruptor(LoggerFactory.getLogger("PUSH-TRACE-SLOW"));
-  private static final int MAX_NTP_TIME_PRECISION_MILLIS = 200;
   private final SubDatum datum;
   final long pushCreateTimestamp = System.currentTimeMillis();
 

server/store/jdbc/src/main/java/com/alipay/sofa/registry/jdbc/repository/impl/AppRevisionJdbcRepository.java

@@ -57,9 +57,6 @@ public class AppRevisionJdbcRepository implements AppRevisionRepository, Recover
 
   private static final Logger LOG = LoggerFactory.getLogger("METADATA-EXCHANGE", "[AppRevision]");
 
-  private static final Logger COUNT_LOG =
-      LoggerFactory.getLogger("METADATA-COUNT", "[AppRevision]");
-
   /** map: <revision, AppRevision> */
   private final LoadingCache<String, AppRevision> registry;
 

server/store/jdbc/src/main/java/com/alipay/sofa/registry/jdbc/repository/impl/DateNowJdbcRepository.java

@@ -43,7 +43,7 @@ public class DateNowJdbcRepository implements DateNowRepository {
   private final DateTimeWatcher watcher = new DateTimeWatcher();
 
   @PostConstruct
-  private void init() {
+  public void init() {
     ConcurrentUtils.createDaemonThread(this.getClass().getSimpleName() + "WatchDog", watcher)
         .start();
   }