Added support for loading place-related classes with a custom class

loader.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3255 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/crowd/client/LocationDirector.java

@@ -1,5 +1,5 @@
 //
-// $Id: LocationDirector.java,v 1.33 2004/08/27 02:12:32 mdb Exp $
+// $Id$
 //
 // Narya library - tools for developing networked games
 // Copyright (C) 2002-2004 Three Rings Design, Inc., All Rights Reserved
@@ -274,6 +274,12 @@ public class LocationDirector extends BasicDirector
         // make a note that we're now mostly in the new location
         _placeId = placeId;
 
+        // check whether we should use a custom class loader
+        ClassLoader loader = getClassLoader(config);
+        if (loader != null) {
+            config.setClassLoader(loader);
+        }
+
         Class cclass = config.getControllerClass();
         try {
             // start up a new place controller to manage the new place
@@ -554,6 +560,18 @@ public class LocationDirector extends BasicDirector
         });
     }
 
+    /**
+     * By overriding this method, it is possible to customize the location
+     * director to cause it to load the classes associated with a
+     * particular place via a custom class loader. That loader may enforce
+     * restricted privileges or obtain the classes from some special
+     * source.
+     */
+    protected ClassLoader getClassLoader (PlaceConfig config)
+    {
+        return null;
+    }
+
     /** The context through which we access needed services. */
     protected CrowdContext _ctx;
 

src/java/com/threerings/crowd/data/PlaceConfig.java

@@ -1,5 +1,5 @@
 //
-// $Id: PlaceConfig.java,v 1.8 2004/08/27 02:12:33 mdb Exp $
+// $Id$
 //
 // Narya library - tools for developing networked games
 // Copyright (C) 2002-2004 Three Rings Design, Inc., All Rights Reserved
@@ -59,6 +59,18 @@ public abstract class PlaceConfig extends TrackedStreamableObject
      */
     public abstract String getManagerClassName ();
 
+    /**
+     * The {@link LocationDirector} may be configured to use a custom
+     * class loader when loading the classes associated with a certain
+     * {@link PlaceConfig}, in this case this method will be called prior
+     * to a call to {@link #getControllerClass} to set {@link #_loader}
+     * which should then be used for any dynamic class loading.
+     */
+    public void setClassLoader (ClassLoader loader)
+    {
+        _loader = loader;
+    }
+
     // documentation inherited
     protected void toString (StringBuffer buf)
     {
@@ -66,4 +78,7 @@ public abstract class PlaceConfig extends TrackedStreamableObject
         buf.append(", ");
         super.toString(buf);
     }
+
+    /** The class loader to use when dynamically loading controller classes. */
+    protected transient ClassLoader _loader = getClass().getClassLoader();
 }