only SigarRegistry needs to implement MBeanRegistration

bindings/java/src/org/hyperic/sigar/jmx/AbstractMBean.java

@@ -24,8 +24,6 @@ import javax.management.AttributeNotFoundException;
 import javax.management.DynamicMBean;
 import javax.management.MBeanException;
 import javax.management.MBeanRegistration;
-import javax.management.MBeanServer;
-import javax.management.ObjectName;
 import javax.management.ReflectionException;
 
 import org.hyperic.sigar.Sigar;
@@ -43,7 +41,7 @@ import org.hyperic.sigar.SigarProxy;
  * @author Bjoern Martin
  * @since 1.5
  */
-public abstract class AbstractMBean implements DynamicMBean, MBeanRegistration {
+public abstract class AbstractMBean implements DynamicMBean {
 
     public static final String MBEAN_DOMAIN = SigarInvokerJMX.DOMAIN_NAME;
     public static final String MBEAN_ATTR_TYPE = SigarInvokerJMX.PROP_TYPE;
@@ -58,16 +56,6 @@ public abstract class AbstractMBean implements DynamicMBean, MBeanRegistration {
      */
     protected final SigarProxy sigar;
 
-    /**
-     * The MBean server this MBean is registered to. Set during the MBean's 
-     * registration to the MBean server and unset to <code>null</code> when
-     * the deregistration finished.
-     * 
-     * @see #preRegister(MBeanServer, ObjectName)
-     * @see #postDeregister()
-     */
-    protected MBeanServer mbeanServer;
-
     /**
      * <p>Creates a new instance of this class. The SigarProxy instance is stored (and 
      * accessible) via the {@link #sigar} member.
@@ -145,59 +133,6 @@ public abstract class AbstractMBean implements DynamicMBean, MBeanRegistration {
         return result;
     }
 
-    // -------
-    // Implementation of the MBeanRegistration interface
-    // -------
-
-    /**
-     * <p>Returns <code>new ObjectName(this.getObjectName())</code> to guarantee 
-     * a reliable and reproducable object name.</p>
-     * 
-     * <p><b>Note:</b> Make sure any subclass does a super call to this method, 
-     * otherwise the implementation might be broken.</p>
-     * 
-     * @see MBeanRegistration#preRegister(MBeanServer, ObjectName)
-     */
-    public ObjectName preRegister(MBeanServer server, ObjectName name)
-            throws Exception {
-        this.mbeanServer = server;
-        return new ObjectName(getObjectName());
-    }
-
-    /**
-     * Empty implementation, allowing subclasses to ignore the interface.
-     * 
-     * <p><b>Note:</b> Make sure any subclass does a super call to this method, 
-     * otherwise the implementation might be broken.</p>
-     * 
-     * @see MBeanRegistration#postRegister(Boolean)
-     */
-    public void postRegister(Boolean success) {
-    }
-
-    /**
-     * Empty implementation, allowing subclasses to ignore the interface.
-     * 
-     * <p><b>Note:</b> Make sure any subclass does a super call to this method, 
-     * otherwise the implementation might be broken.</p>
-     * 
-     * @see MBeanRegistration#preDeregister()
-     */
-    public void preDeregister() throws Exception {
-    }
-
-    /**
-     * Empty implementation, allowing subclasses to ignore the interface.
-     * 
-     * <p><b>Note:</b> Make sure any subclass does a super call to this method, 
-     * otherwise the implementation might be broken.</p>
-     * 
-     * @see MBeanRegistration#postDeregister()
-     */
-    public void postDeregister() {
-        this.mbeanServer = null;
-    }
-
     public void setAttribute(Attribute attr) throws AttributeNotFoundException {
         throw new AttributeNotFoundException(attr.getName());
     }

bindings/java/src/org/hyperic/sigar/jmx/SigarRegistry.java

@@ -22,6 +22,7 @@ import java.util.ArrayList;
 
 import javax.management.AttributeNotFoundException;
 import javax.management.MBeanInfo;
+import javax.management.MBeanRegistration;
 import javax.management.MBeanServer;
 import javax.management.ObjectInstance;
 import javax.management.ObjectName;
@@ -57,7 +58,7 @@ import org.hyperic.sigar.SigarProxy;
  * @author Bjoern Martin
  * @since 1.5
  */
-public class SigarRegistry extends AbstractMBean {
+public class SigarRegistry extends AbstractMBean implements MBeanRegistration {
 
     private static final String MBEAN_TYPE = "SigarRegistry";
 
@@ -79,6 +80,7 @@ public class SigarRegistry extends AbstractMBean {
     private final String objectName;
 
     private final ArrayList managedBeans;
+    private MBeanServer mbeanServer;
 
     public SigarRegistry(SigarProxy sigar) {
         super(sigar);
@@ -117,6 +119,11 @@ public class SigarRegistry extends AbstractMBean {
     // -------
     // Implementation of the MBeanRegistration interface
     // -------
+    public ObjectName preRegister(MBeanServer server, ObjectName name)
+        throws Exception {
+        this.mbeanServer = server;                                                                            
+        return new ObjectName(getObjectName());                                                               
+    }
 
     /**
      * Registers the default set of Sigar MBeans. Before doing so, a super call 
@@ -127,8 +134,6 @@ public class SigarRegistry extends AbstractMBean {
     public void postRegister(Boolean success) {
         ReflectedMBean mbean;
 
-        super.postRegister(success);
-
         if (!success.booleanValue())
             return;
 
@@ -239,8 +244,9 @@ public class SigarRegistry extends AbstractMBean {
                 }
             }
         }
+    }
 
-        // do the super call
+    public void postDeregister() {
-        super.preDeregister();
+        this.mbeanServer = null;                                                                              
     }
 }