Fix ‘tags.get’ cause ClassCastException, because after akka-message/serialize,...

Fix ‘tags.get’ cause ClassCastException, because after akka-message/serialize, all tags values are type of String.class.

skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/BooleanTag.java

@@ -17,7 +17,20 @@ public class BooleanTag extends AbstractTag<Boolean>{
         span.setTag(key, tagValue);
     }
 
-    @Override public Boolean get(Span span) {
-        return (Boolean)span.getTag(super.key);
+    /**
+     * Get a tag value, type of {@link Boolean}.
+     * After akka-message/serialize, all tags values are type of {@link String}, convert to {@link Boolean}, if necessary.
+     *
+     * @param span
+     * @return tag value
+     */
+    @Override
+    public Boolean get(Span span) {
+        Object tagValue = span.getTag(super.key);
+        if(tagValue instanceof Boolean){
+            return (Boolean)tagValue;
+        }else {
+            return Boolean.valueOf(tagValue.toString());
+        }
     }
 }

skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/IntTag.java

@@ -17,7 +17,20 @@ public class IntTag extends AbstractTag<Integer> {
         span.setTag(super.key, tagValue);
     }
 
-    @Override public Integer get(Span span) {
-        return (Integer)span.getTag(super.key);
+    /**
+     * Get a tag value, type of {@link Integer}.
+     * After akka-message/serialize, all tags values are type of {@link String}, convert to {@link Integer}, if necessary.
+     *
+     * @param span
+     * @return tag value
+     */
+    @Override
+    public Integer get(Span span) {
+        Object tagValue = span.getTag(super.key);
+        if(tagValue instanceof Integer){
+            return (Integer)tagValue;
+        }else {
+            return Integer.valueOf(tagValue.toString());
+        }
     }
 }

skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/tag/ShortTag.java

@@ -17,7 +17,19 @@ public class ShortTag extends AbstractTag<Short> {
         span.setTag(super.key, tagValue);
     }
 
+    /**
+     * Get a tag value, type of {@link Short}.
+     * After akka-message/serialize, all tags values are type of {@link String}, convert to {@link Short}, if necessary.
+     *
+     * @param span
+     * @return tag value
+     */
     @Override public Short get(Span span) {
-        return (Short)span.getTag(super.key);
+        Object tagValue = span.getTag(super.key);
+        if(tagValue instanceof Short){
+            return (Short)tagValue;
+        }else {
+            return Short.valueOf(tagValue.toString());
+        }
     }
 }