Allows to fix a destination in memory, it forces the preload during

server initialization (JORAM-358).

joram/joram/mom/core/src/main/java/org/objectweb/joram/mom/dest/Destination.java

@@ -410,10 +410,18 @@ public abstract class Destination extends Agent implements DestinationMBean {
         logger.log(BasicLevel.ERROR, this + ": error setting destination period", e);
       }
     }
+    
+    boolean fixedInMemory = false;
+    if (prop != null && prop.containsKey(DestinationConstants.FIXED_IN_MEMORY)) 
+      fixedInMemory = ConversionHelper.toBoolean(prop.get(DestinationConstants.FIXED_IN_MEMORY));
+    
     if (firstTime) {
       period = newPeriod;
+      fixed = fixedInMemory;
     } else {
       setPeriod(newPeriod);
+      if (fixedInMemory)
+        logger.log(BasicLevel.ERROR, this + ": cannot fix already created destination in memory.");
     }
     
     interceptorsProp = null;

joram/joram/shared/src/main/java/org/objectweb/joram/shared/DestinationConstants.java

 /*
  * JORAM: Java(TM) Open Reliable Asynchronous Messaging
- * Copyright (C) 2009 - 2019 ScalAgent Distributed Technologies
+ * Copyright (C) 2009 - 2020 ScalAgent Distributed Technologies
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -35,6 +35,12 @@ public final class DestinationConstants {
   public static final String REDELIVERY_DELAY = "redeliveryDelay";
   public static final String DELIVERY_DELAY = "deliveryDelay";
 
+  /**
+   * Name of property allowing to force the destination to be always in memory.
+   * By side effect the destination is pre-loaded during server initialization.
+   */
+  public static final String FIXED_IN_MEMORY = "fixedInMemory";
+  
   /** The property name for the distribution handler class name. */
   public static final String DISTRIBUTION_CLASS_NAME = "distribution.className";
   /** */