Adding the APIBuilder

The APIBuilder is an implementation for the MBeanServerBuilder that is
used to instantiate the APIMBeanServer as the platform MBeanServer.

Signed-off-by: Amnon Heiman <amnon@scylladb.com>

src/main/java/com/scylladb/jmx/utils/APIBuilder.java

@@ -0,0 +1,41 @@
+package com.scylladb.jmx.utils;
+/**
+ * Copyright 2016 ScyllaDB
+ */
+
+/*
+* This file is part of Scylla.
+*
+* Scylla is free software: you can redistribute it and/or modify
+* it under the terms of the GNU Affero General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* Scylla 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 General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with Scylla.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+import javax.management.MBeanServer;
+import javax.management.MBeanServerDelegate;
+
+import mx4j.server.ChainedMBeanServerBuilder;
+
+public class APIBuilder extends ChainedMBeanServerBuilder {
+    public APIBuilder() {
+        super(new mx4j.server.MX4JMBeanServerBuilder());
+    }
+
+    public MBeanServer newMBeanServer(String defaultDomain, MBeanServer outer,
+            MBeanServerDelegate delegate) {
+        APIMBeanServer extern = new APIMBeanServer();
+        MBeanServer nested = getMBeanServerBuilder().newMBeanServer(
+                defaultDomain, outer == null ? extern : outer, delegate);
+        extern.setMBeanServer(nested);
+        return extern;
+    }
+}