Add exceptionsToTrace configuration support in @SentinelResource annotation (#543)

sentinel-core/src/main/java/com/alibaba/csp/sentinel/annotation/SentinelResource.java

@@ -15,14 +15,10 @@
  */
 package com.alibaba.csp.sentinel.annotation;
 
-import java.lang.annotation.ElementType;
-import java.lang.annotation.Inherited;
-import java.lang.annotation.Retention;
-import java.lang.annotation.RetentionPolicy;
-import java.lang.annotation.Target;
-
 import com.alibaba.csp.sentinel.EntryType;
 
+import java.lang.annotation.*;
+
 /**
  * The annotation indicates a definition of Sentinel resource.
  *
@@ -63,4 +59,9 @@ public @interface SentinelResource {
      * @return name of the fallback function, empty by default
      */
     String fallback() default "";
+
+    /**
+     * @return the exception classes to trace, Throwable.class by default
+     */
+    Class<? extends Throwable>[] exceptionsToTrace() default {Throwable.class};
 }

sentinel-extension/sentinel-annotation-aspectj/src/main/java/com/alibaba/csp/sentinel/annotation/aspectj/SentinelResourceAspect.java

@@ -59,7 +59,9 @@ public class SentinelResourceAspect extends AbstractSentinelAspectSupport {
         } catch (BlockException ex) {
             return handleBlockException(pjp, annotation, ex);
         } catch (Throwable ex) {
+            if (isTrackedException(ex, annotation.exceptionsToTrace())) {
                 Tracer.trace(ex);
+            }
             throw ex;
         } finally {
             if (entry != null) {
@@ -67,4 +69,23 @@ public class SentinelResourceAspect extends AbstractSentinelAspectSupport {
             }
         }
     }
+
+    /**
+     * whether the exception is in tracked list of exception classes
+     *
+     * @param ex
+     * @param exceptionsToTrace
+     * @return
+     */
+    private boolean isTrackedException(Throwable ex, Class<? extends Throwable>[] exceptionsToTrace) {
+        if (exceptionsToTrace == null) {
+            return false;
+        }
+        for (Class exceptionToTrace : exceptionsToTrace) {
+            if (exceptionToTrace.isAssignableFrom(ex.getClass())) {
+                return true;
+            }
+        }
+        return false;
+    }
 }