Bug fix for automatic exit of default context when exiting the entry

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

sentinel-core/src/main/java/com/alibaba/csp/sentinel/CtEntry.java

@@ -89,8 +89,9 @@ class CtEntry extends Entry {
                 }
                 if (parent == null) {
                     // Default context (auto entered) will be exited automatically.
-                    // Note: NullContext won't be exited automatically.
-                    ContextUtil.exit();
+                    if (ContextUtil.isDefaultContext(context)) {
+                        ContextUtil.exit();
+                    }
                 }
                 // Clean the reference of context in current entry to avoid duplicate exit.
                 clearEntryContext();

sentinel-core/src/main/java/com/alibaba/csp/sentinel/context/ContextUtil.java

@@ -23,6 +23,7 @@ import com.alibaba.csp.sentinel.Constants;
 import com.alibaba.csp.sentinel.EntryType;
 import com.alibaba.csp.sentinel.SphO;
 import com.alibaba.csp.sentinel.SphU;
+import com.alibaba.csp.sentinel.log.RecordLog;
 import com.alibaba.csp.sentinel.node.DefaultNode;
 import com.alibaba.csp.sentinel.node.EntranceNode;
 import com.alibaba.csp.sentinel.node.Node;
@@ -73,6 +74,7 @@ public class ContextUtil {
      */
     static void resetContextMap() {
         if (contextNameNodeMap != null) {
+            RecordLog.warn("Context map cleared and reset to initial state");
             contextNameNodeMap.clear();
             initDefaultContext();
         }
@@ -190,6 +192,20 @@ public class ContextUtil {
         }
     }
 
+    /**
+     * Check if provided context is a default auto-created context.
+     *
+     * @param context context to check
+     * @return true if it is a default context, otherwise false
+     * @since 0.2.0
+     */
+    public static boolean isDefaultContext(Context context) {
+        if (context == null) {
+            return false;
+        }
+        return Constants.CONTEXT_DEFAULT_NAME.equals(context.getName());
+    }
+
     /**
      * Get {@link Context} of current thread.
      *