From 75de569b16a35eede55393757083dfa83d36b368 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stephan=20B=C3=B6sebeck?= <stephan@boesebeck.biz>
Date: Thu, 11 Apr 2019 21:56:36 +0200
Subject: [PATCH] fixing deadlock in messaging

---
 .../caluga/morphium/messaging/Messaging.java  |  8 +++-
 .../test/mongo/suite/MessagingTest.java       | 45 +++++++++++++++++++
 2 files changed, 52 insertions(+), 1 deletion(-)

diff --git a/src/de/caluga/morphium/messaging/Messaging.java b/src/de/caluga/morphium/messaging/Messaging.java
index 263ae86a3..914aa63f5 100644
--- a/src/de/caluga/morphium/messaging/Messaging.java
+++ b/src/de/caluga/morphium/messaging/Messaging.java
@@ -458,6 +458,7 @@ private void lockAndProcess(Msg obj) {
         if (obj != null && obj.getLockedBy() != null && obj.getLockedBy().equals(id)) {
             List<Msg> lst = new ArrayList<>();
             lst.add(obj);
+            log.debug("locked messages: "+lst.size());
             try {
                 processMessages(lst);
             } catch (Exception e) {
@@ -477,13 +478,18 @@ private void processMessages(Iterable<Msg> messages) {
             if (msg == null) continue;
 
             if (msg.getInAnswerTo() != null && waitingForMessages.get(msg.getInAnswerTo()) != null) {
+                log.debug("Got a message, we are waiting for...");
                 //this message we were waiting for
                 waitingForAnswers.put((MorphiumId) msg.getInAnswerTo(), msg);
                 processing.remove(m.getMsgId());
                 morphium.delete(msg, getCollectionName());
                 return;
             }
-            if (listeners.isEmpty() && listenerByName.isEmpty()) return;
+            if (listeners.isEmpty() && listenerByName.isEmpty()) {
+                updateProcessedByAndReleaseLock(msg);
+                log.debug("no listener registered... not processing message");
+                return;
+            }
 //            Query<? extends Msg> q = morphium.createQueryFor(m.getClass()).f("_id").eq(m.getMsgId());
 //            q.setCollectionName(getCollectionName());
 //            morphium.push(q, Msg.Fields.receivedBy, id);
diff --git a/test/de/caluga/test/mongo/suite/MessagingTest.java b/test/de/caluga/test/mongo/suite/MessagingTest.java
index fdec004b9..781b7a8e4 100644
--- a/test/de/caluga/test/mongo/suite/MessagingTest.java
+++ b/test/de/caluga/test/mongo/suite/MessagingTest.java
@@ -637,13 +637,58 @@ public void answeringTest() throws Exception {
 
     }
 
+    @Test
+    public void answers3NodesTest() throws Exception {
+        Messaging m1=new Messaging(morphium, 10, false,true,10);
+        m1.setSenderId("m1");
+        Messaging m2=new Messaging(morphium, 10, false,true,10);
+        m2.setSenderId("m2");
+        Messaging mSrv=new Messaging(morphium, 10, false,true,10);
+        mSrv.setSenderId("Srv");
+
+        m1.start();
+        m2.start();
+        mSrv.start();
+
+        mSrv.addListenerForMessageNamed("query",(msg,m)->{
+            log.info("Incoming message - sending result");
+            Msg answer=m.createAnswerMsg();
+            answer.setValue("Result");
+            return answer;
+        });
+        Thread.sleep(1000);
+
+
+        for (int i=0;i<10; i++) {
+            Msg m = new Msg("query", "a message", "a query");
+            m.setExclusive(true);
+            log.info("Sending m1...");
+            Msg answer1=m1.sendAndAwaitFirstAnswer(m,1000);
+            assert(answer1 != null);
+            m = new Msg("query", "a message", "a query");
+            log.info("... got it. Sending m2");
+            Msg answer2=m2.sendAndAwaitFirstAnswer(m,1000);
+            assert(answer2!=null);
+            log.info("... got it.");
+        }
+
+    }
+
     @Test
     public void getAnswersTest() throws Exception {
         Messaging m1=new Messaging(morphium, 10, false,true,10);
         Messaging m2=new Messaging(morphium, 10, false,true,10);
+        Messaging mTst=new Messaging(morphium, 10, false,true,10);
 
         m1.start();
         m2.start();
+        mTst.start();
+
+
+        mTst.addListenerForMessageNamed("somethign else",(msg,m)->{
+            log.info("incoming message??");
+            return null;
+        });
 
         m2.addListenerForMessageNamed("question",(msg,m)->{
             Msg answer=m.createAnswerMsg();