Revert "Revert "Revert "Balder/send in own thread"""

1 files changed, 31 insertions, 2 deletions

diff --git a/messagebus/src/main/java/com/yahoo/messagebus/Messenger.java b/messagebus/src/main/java/com/yahoo/messagebus/Messenger.java
index 2cb2f0967e5..63e5dbb2d04 100755
--- a/messagebus/src/main/java/com/yahoo/messagebus/Messenger.java
+++ b/messagebus/src/main/java/com/yahoo/messagebus/Messenger.java
@@ -1,6 +1,7 @@
 // Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 package com.yahoo.messagebus;
 
+import com.yahoo.concurrent.DaemonThreadFactory;
 import com.yahoo.log.LogLevel;
 
 import java.util.ArrayDeque;
@@ -8,6 +9,9 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Queue;
 import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.RejectedExecutionException;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.logging.Logger;
 
@@ -23,6 +27,7 @@ public class Messenger implements Runnable {
     private static final Logger log = Logger.getLogger(Messenger.class.getName());
     private final AtomicBoolean destroyed = new AtomicBoolean(false);
     private final List<Task> children = new ArrayList<>();
+    private final ExecutorService sendExecutor = Executors.newSingleThreadExecutor(new DaemonThreadFactory("messenger.send"));
     private final Queue<Task> queue = new ArrayDeque<>();
 
     private final Thread thread = new Thread(this, "Messenger");
@@ -64,8 +69,13 @@ public class Messenger implements Runnable {
     public void deliverMessage(final Message msg, final MessageHandler handler) {
         if (destroyed.get()) {
             msg.discard();
-        } else {
-            handler.handleMessage(msg);
+            return;
+        }
+        try {
+            sendExecutor.execute(new MessageTask(msg, handler));
+        } catch (RejectedExecutionException e) {
+            msg.discard();
+            log.warning("Execution rejected " + e.getMessage());
         }
     }
 
@@ -126,6 +136,7 @@ public class Messenger implements Runnable {
         boolean done = false;
         enqueue(Terminate.INSTANCE);
         if (!destroyed.getAndSet(true)) {
+            sendExecutor.shutdownNow().forEach((Runnable task) -> {((MessageTask) task).msg.discard();});
             try {
                 synchronized (this) {
                     while (!queue.isEmpty()) {
@@ -208,6 +219,24 @@ public class Messenger implements Runnable {
         void destroy();
     }
 
+    private static class MessageTask implements Runnable {
+
+        final MessageHandler handler;
+        Message msg;
+
+        MessageTask(final Message msg, final MessageHandler handler) {
+            this.msg = msg;
+            this.handler = handler;
+        }
+
+        @Override
+        public void run() {
+            final Message msg = this.msg;
+            this.msg = null;
+            handler.handleMessage(msg);
+        }
+    }
+
     private static class ReplyTask implements Task {
 
         final ReplyHandler handler;