Re-included the means to prevent the main thread from exiting until the vm is exited elsewhere (either Ctrl+C, terminateJVM, etc.)

git-svn-id: https://svn.apache.org/repos/asf/incubator/activemq/trunk@365865 13f79535-47bb-0310-9956-ffa450edef68

activemq-core/src/main/java/org/apache/activemq/broker/Main.java

@@ -111,7 +111,8 @@ public class Main {
         QUERY_TYPE_ID_MAP.setProperty("Topic",            "Destination");
     };
 
-    private final ArrayList extensions   = new ArrayList();
+    private final List brokers      = new ArrayList();
+    private final List extensions   = new ArrayList();
     private final Map  queryObjects = new HashMap();
     private final List queryViews   = new ArrayList();
 
@@ -444,6 +445,8 @@ public class Main {
                 this.startBroker(this.getConfigUri());
 //            }
         }
+        
+        waitForShutdown();
     }
 
     protected void taskStopBrokers(List brokerNames) throws Throwable {
@@ -649,6 +652,37 @@ public class Main {
         }
     }
 
+    public void waitForShutdown() throws Throwable {
+        // Prevent the main thread from exiting, in case this is the last user thread
+        final boolean[] shutdown = new boolean[]{false};
+        Runtime.getRuntime().addShutdownHook(new Thread() {
+            public void run() {
+                synchronized(shutdown) {
+                    shutdown[0]=true;
+                    shutdown.notify();
+                }
+            }
+        });
+        synchronized(shutdown) {
+            while( !shutdown[0] ) {
+                shutdown.wait();
+            }
+        }
+
+        // Use reflection to stop the broker in case, the vm was exited via unconventional means
+        try {
+            for (Iterator i=brokers.iterator(); i.hasNext();) {
+                Object broker = i.next();
+                Method stop = broker.getClass().getMethod("stop", new Class[] {});
+                stop.invoke(broker, new Object[] {});
+            }
+        } catch (InvocationTargetException e) {
+            throw e.getCause();
+        } catch (Throwable e) {
+            throw e;
+        }
+    }
+
     public void stopBroker(MBeanServerConnection server, String brokerName) {
         ObjectName brokerObjName = null;
         try {