Convert Narya (most of the way) over to a Maven Ant task based build. The

ActionScript bits remain belligerent, but the Java stuff is mostly shipshape.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@6222 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/main/java/com/threerings/admin/server/PeeredDatabaseConfigRegistry.java

@@ -0,0 +1,129 @@
+//
+// $Id$
+//
+// Narya library - tools for developing networked games
+// Copyright (C) 2002-2010 Three Rings Design, Inc., All Rights Reserved
+// http://code.google.com/p/narya/
+//
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.threerings.admin.server;
+
+import java.util.ArrayList;
+
+import com.google.common.collect.Lists;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+
+import com.samskivert.util.Invoker;
+
+import com.samskivert.depot.PersistenceContext;
+
+import com.threerings.io.Streamable;
+
+import com.threerings.util.StreamableTuple;
+
+import com.threerings.presents.annotation.MainInvoker;
+import com.threerings.presents.dobj.AttributeChangedEvent;
+import com.threerings.presents.dobj.DObject;
+import com.threerings.presents.peer.server.PeerManager;
+
+import static com.threerings.admin.Log.log;
+
+/**
+ * A database backed config registry that registers with the peer system and synchronizes with its
+ * peers when configuration fields are changed.
+ */
+@Singleton
+public class PeeredDatabaseConfigRegistry extends DatabaseConfigRegistry
+{
+    @Inject public PeeredDatabaseConfigRegistry (
+        PersistenceContext ctx, @MainInvoker Invoker invoker, PeerManager peermgr)
+    {
+        super(ctx, invoker, "");
+        _peermgr = peermgr;
+    }
+
+    @Override // from ConfigRegistry
+    protected ObjectRecord createObjectRecord (String path, DObject object)
+    {
+        return new PeerDatabaseObjectRecord(path, object);
+    }
+
+    /** Stores settings in a database and broadcasts changes to peers. */
+    protected class PeerDatabaseObjectRecord extends DatabaseObjectRecord
+        implements PeerManager.StaleCacheObserver
+    {
+        public PeerDatabaseObjectRecord (String path, DObject object)
+        {
+            super(path, object);
+            _peermgr.addStaleCacheObserver(PEER_CACHE_PREFIX + _path, this);
+        }
+
+        // from interface PeerManager.StaleCacheObserver
+        public void changedCacheData (Streamable data)
+        {
+            @SuppressWarnings("unchecked") StreamableTuple<String, Object> change =
+                (StreamableTuple<String, Object>)data;
+
+            // note that we should ignore the attribute change event we're about to generate
+            // because it is not a real configuration change but rather a sync
+            try {
+                object.changeAttribute(change.left, change.right);
+                _pendingSyncs.add(change.left);
+            } catch (Exception e) {
+                log.warning("Config attribute sync failed " + change + ".", e);
+            }
+        }
+
+        @Override // from ObjectRecord
+        public void attributeChanged (AttributeChangedEvent event)
+        {
+            // if this was a pending sync event, don't pass it to our parent as it is not a real
+            // configuration change event
+            if (!_pendingSyncs.remove(event.getName())) {
+                super.attributeChanged(event);
+            }
+        }
+
+        @Override // from ObjectRecord
+        protected void updateValue (String name, Object value)
+        {
+            super.updateValue(name, value);
+            fieldUpdated(name, value);
+        }
+
+        @Override // from ObjectRecord
+        protected void serialize (String name, String key, Object value)
+        {
+            super.serialize(name, key, value);
+            fieldUpdated(name, value);
+        }
+
+        protected void fieldUpdated (String field, Object value)
+        {
+            // broadcast to the other nodes that this value has changed
+            _peermgr.broadcastStaleCacheData(
+                PEER_CACHE_PREFIX + _path, new StreamableTuple<String, Object>(field, value));
+        }
+
+        protected ArrayList<String> _pendingSyncs = Lists.newArrayList();
+    }
+
+    protected PeerManager _peermgr;
+
+    /** Prefixed to our cache invalidation notifications. */
+    protected static final String PEER_CACHE_PREFIX = "PeerConfigCache:";
+}