wu-sheng commented on a change in pull request #4247: fix thread unsafe problem 
in server-alarm-plugin (#4230)
URL: https://github.com/apache/skywalking/pull/4247#discussion_r368267823
 
 

 ##########
 File path: 
oap-server/server-alarm-plugin/src/main/java/org/apache/skywalking/oap/server/core/alarm/provider/RunningRule.java
 ##########
 @@ -290,28 +278,28 @@ private boolean isMatch() {
 
                 switch (valueType) {
                     case LONG:
-                        long lvalue = ((LongValueHolder)metrics).getValue();
+                        long lvalue = ((LongValueHolder) metrics).getValue();
                         long lexpected = 
RunningRule.this.threshold.getLongThreshold();
                         if (op.test(lexpected, lvalue)) {
                             matchCount++;
                         }
                         break;
                     case INT:
-                        int ivalue = ((IntValueHolder)metrics).getValue();
+                        int ivalue = ((IntValueHolder) metrics).getValue();
                         int iexpected = 
RunningRule.this.threshold.getIntThreshold();
                         if (op.test(iexpected, ivalue)) {
                             matchCount++;
                         }
                         break;
                     case DOUBLE:
-                        double dvalue = 
((DoubleValueHolder)metrics).getValue();
+                        double dvalue = ((DoubleValueHolder) 
metrics).getValue();
                         double dexpected = 
RunningRule.this.threshold.getDoubleThreshold();
                         if (op.test(dexpected, dvalue)) {
                             matchCount++;
                         }
                         break;
                     case MULTI_INTS:
-                        int[] ivalueArray = 
((MultiIntValuesHolder)metrics).getValues();
+                        int[] ivalueArray = ((MultiIntValuesHolder) 
metrics).getValues();
 
 Review comment:
   What change the format of all these cases?

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