Bug fixes in models simulators

[policy/models.git] / models-interactions / model-simulators / src / main / java / org / onap / policy / simulators / TopicServer.java

diff --git a/models-interactions/model-simulators/src/main/java/org/onap/policy/simulators/TopicServer.java b/models-interactions/model-simulators/src/main/java/org/onap/policy/simulators/TopicServer.java
index 0abe5f4..4c01511 100644 (file)
--- a/models-interactions/model-simulators/src/main/java/org/onap/policy/simulators/TopicServer.java
+++ b/models-interactions/model-simulators/src/main/java/org/onap/policy/simulators/TopicServer.java
@@ -65,8 +65,17 @@ public abstract class TopicServer<Q> implements TopicListener {
             throw new IllegalArgumentException("cannot decode request from " + source.getTopic());
         }
 
-        sink.send(process(req));
+        String resp = process(req);
+        if (resp != null) {
+            sink.send(resp);
+        }
     }
 
+    /**
+     * Processes a request.
+     *
+     * @param request request to be processed
+     * @return the response, or {@code null} if no response is to be sent
+     */
     protected abstract String process(Q request);
 }