The basis of cluster support for Presents servers. All servers in a cluster

make connections to other servers in the cluster and can exchange events (in a
limited fashion).

This is different than Liz's project wherein servers share an oid space and one
can interchangably work with distributed objects from any server. This package
provides a means by which certain services (by default, presence and chat) can
be communicated between servers to allow communication between players
scattered around a bunch of otherwise independent server instances.

This is less general purpose but also less likely to encourage people to write
code that tightly couples multiple servers and then falls over because it
generates gobs of network traffic as events are flung willy nilly behind the
scenes.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4238 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/io/Streamer.java

@@ -92,7 +92,7 @@ public class Streamer
             createStreamers();
         }
 
-        Streamer stream = (Streamer)_streamers.get(target);
+        Streamer stream = _streamers.get(target);
         if (stream == null) {
             // make sure this is a streamable class
             if (!isStreamable(target)) {
@@ -108,11 +108,9 @@ public class Streamer
             // create our streamer in a privileged block so that it can
             // introspect on the to be streamed class
             try {
-                stream = (Streamer) AccessController.doPrivileged(
-                    new PrivilegedExceptionAction() {
-                        public Object run ()
-                            throws IOException
-                        {
+                stream = AccessController.doPrivileged(
+                    new PrivilegedExceptionAction<Streamer>() {
+                        public Streamer run () throws IOException {
                             return new Streamer(target);
                         }
                     });
@@ -376,7 +374,8 @@ public class Streamer
             } catch (Exception e) {
                 String errmsg = "Failure reading streamable field " +
                     "[class=" + _target.getName() +
-                    ", field=" + field.getName() + "]";
+                    ", field=" + field.getName() +
+                    ", error=" + e.getMessage() + "]";
                 throw (IOException) new IOException(errmsg).initCause(e);
             }
         }
@@ -460,7 +459,7 @@ public class Streamer
      */
     protected static void createStreamers ()
     {
-        _streamers = new HashMap();
+        _streamers = new HashMap<Class,Streamer>();
 
         // register all of the basic streamers
         int bscount = BasicStreamers.BSTREAMER_TYPES.length;
@@ -495,7 +494,7 @@ public class Streamer
 
     /** Contains the mapping from class names to configured streamer
      * instances. */
-    protected static HashMap _streamers;
+    protected static HashMap<Class,Streamer> _streamers;
 
     /** The name of the custom reader method. */
     protected static final String READER_METHOD_NAME = "readObject";