Messaging facade for clustered communications to allow implementations from JGroups or Hazelcast to be used.

* PropertyBackedBeanExporter uses the facade, configured with JGroups messaging implementation.
* Unfortunately, some remodelling required before this will work with Ehcache's CacheManagerPeerProviderFactory




git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@33830 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/cluster/JGroupsMessengerFactory.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2005-2012 Alfresco Software Limited.
+ *
+ * This file is part of Alfresco
+ *
+ * Alfresco 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Alfresco 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 Alfresco. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.alfresco.repo.cluster;
+
+import java.io.Serializable;
+
+import org.alfresco.repo.jgroups.AlfrescoJGroupsChannelFactory;
+import org.alfresco.util.PropertyCheck;
+import org.jgroups.Channel;
+import org.springframework.beans.factory.annotation.Required;
+
+/**
+ * JGroups implementation of the {@link MessengerFactory} interface.
+ * 
+ * @author Matt Ward
+ */
+public class JGroupsMessengerFactory implements MessengerFactory
+{
+    private String appRegion;
+    
+    
+    @Override
+    public <T extends Serializable> Messenger<T> createMessenger()
+    {
+        PropertyCheck.mandatory(this, "appRegion", appRegion);
+        Channel channel = AlfrescoJGroupsChannelFactory.getChannel(appRegion);
+        return new JGroupsMessenger<T>(channel);
+    }
+
+    @Required
+    public void setAppRegion(String appRegion)
+    {
+        this.appRegion = appRegion;
+    }    
+}