Tweaks to allow serializing config attributes other than DSets.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@6304 542714f4-19e9-0310-aa3c-eee0fc999fb1

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

@@ -60,6 +60,9 @@ public class Streamer
      */
     public synchronized static boolean isStreamable (Class<?> target)
     {
+        // if we have not yet initialized ourselves, do so now
+        maybeInit();
+
         while (true) {
             // if we've got a streamer for it, it's good
             if (_streamers.containsKey(target)) {
@@ -108,9 +111,7 @@ public class Streamer
         throws IOException
     {
         // if we have not yet initialized ourselves, do so now
-        if (_streamers == null) {
-            _streamers = Maps.newHashMap(BasicStreamers.BSTREAMERS);
-        }
+        maybeInit();
 
         Streamer stream = _streamers.get(target);
         if (stream == null) {
@@ -487,6 +488,16 @@ public class Streamer
         }
     }
 
+    /**
+     * Initializes static state if necessary.
+     */
+    protected synchronized static void maybeInit ()
+    {
+        if (_streamers == null) {
+            _streamers = Maps.newHashMap(BasicStreamers.BSTREAMERS);
+        }
+    }
+
     /** Used to coerce the type system into quietude when reading enums from the wire. */
     protected static enum EnumReader implements ByteEnum {
         NOT_USED;