[SCB-2579] enable checkstyle ParenPad (#3093)

diff --git a/ci/checkstyle/checkstyle.xml b/ci/checkstyle/checkstyle.xml
index 311f255..9684dc3 100644
--- a/ci/checkstyle/checkstyle.xml
+++ b/ci/checkstyle/checkstyle.xml
@@ -61,6 +61,12 @@
       <property name="allowLineBreaks" value="true"/>
       <property name="severity" value="error"/>
     </module>
+    <module name="ParenPad">
+      <!-- Checks that there is no whitespace before close parens or after
+           open parens.
+      -->
+      <property name="severity" value="error"/>
+    </module>
     <!-- Checks for over-complicated boolean expressions. -->
     <module name="SimplifyBooleanExpression"/>
     <module name="RedundantImport"/>
diff --git a/foundations/foundation-common/src/test/java/org/apache/servicecomb/foundation/common/event/TestEventBus.java b/foundations/foundation-common/src/test/java/org/apache/servicecomb/foundation/common/event/TestEventBus.java
index 8f7829c..68cac74 100644
--- a/foundations/foundation-common/src/test/java/org/apache/servicecomb/foundation/common/event/TestEventBus.java
+++ b/foundations/foundation-common/src/test/java/org/apache/servicecomb/foundation/common/event/TestEventBus.java
@@ -35,7 +35,7 @@
   public static class SubscriberForTest {
     private final List<Object> events;
 
-    public SubscriberForTest( List<Object> events) {
+    public SubscriberForTest(List<Object> events) {
       this.events = events;
     }
     @Subscribe
@@ -53,7 +53,7 @@
   public static class SubscriberWithOrderForTest {
     private final List<Object> events;
 
-    public SubscriberWithOrderForTest( List<Object> events) {
+    public SubscriberWithOrderForTest(List<Object> events) {
       this.events = events;
     }
 
diff --git a/service-registry/registry-service-center/src/main/java/org/apache/servicecomb/serviceregistry/registry/cache/RefreshableMicroserviceCache.java b/service-registry/registry-service-center/src/main/java/org/apache/servicecomb/serviceregistry/registry/cache/RefreshableMicroserviceCache.java
index 9124a66..03b6fb1 100644
--- a/service-registry/registry-service-center/src/main/java/org/apache/servicecomb/serviceregistry/registry/cache/RefreshableMicroserviceCache.java
+++ b/service-registry/registry-service-center/src/main/java/org/apache/servicecomb/serviceregistry/registry/cache/RefreshableMicroserviceCache.java
@@ -226,10 +226,8 @@
 
   private boolean microserviceMatched(MicroserviceInstanceChangedEvent event) {
     return (key.getAppId().equals(event.getKey().getAppId())) // appId matched
-        && ( // microserviceName matched
-        key.getServiceName().equals(event.getKey().getServiceName())
-            || key.getServiceName().equals(
-            event.getKey().getAppId() + DefinitionConst.APP_SERVICE_SEPARATOR + event.getKey().getServiceName()
-        ));
+            && (key.getServiceName().equals(event.getKey().getServiceName()) // microserviceName matched
+            || key.getServiceName().equals(event.getKey().getAppId() + DefinitionConst.APP_SERVICE_SEPARATOR + event.getKey().getServiceName()
+    ));
   }
 }