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/*
 * File: DeferredMBeanProxy.java
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 * the Common Development and Distribution License 1.0 (the "License").
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 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the License by consulting the LICENSE.txt file
 * distributed with this file, or by consulting https://oss.oracle.com/licenses/CDDL
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 * and limitations under the License.
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package com.oracle.tools.deferred.jmx;

import com.oracle.tools.deferred.Deferred;
import com.oracle.tools.deferred.InstanceUnavailableException;
import com.oracle.tools.deferred.UnresolvableInstanceException;

import java.io.IOException;

import javax.management.JMX;
import javax.management.MBeanServerConnection;
import javax.management.ObjectName;

import javax.management.remote.JMXConnector;

/**
 * A {@link DeferredMBeanProxy} is a {@link Deferred} for a local
 * proxy to an MBean.
 * 

* Copyright (c) 2012. All Rights Reserved. Oracle Corporation.
* Oracle is a registered trademark of Oracle Corporation and/or its affiliates. * * @author Brian Oliver */ public class DeferredMBeanProxy implements Deferred { /** * A {@link Deferred} for the {@link JMXConnector} * that should be used to create the MBean proxy */ private Deferred m_deferredJMXConnector; /** * The {@link ObjectName} for the required MBean. */ private ObjectName m_objectName; /** * The class of the proxy to create. */ private Class m_proxyClass; /** * Constructs a {@link DeferredMBeanProxy} given a {@link Deferred} * for the {@link JMXConnector}, the name of the MBean object and proxy * class. * * @param deferredJMXConnector the {@link Deferred} for the * {@link JMXConnector} from which to acquire the * MBean proxy * @param objectName the {@link ObjectName} of the MBean * @param proxyClass the proxy class */ public DeferredMBeanProxy(Deferred deferredJMXConnector, ObjectName objectName, Class proxyClass) { m_deferredJMXConnector = deferredJMXConnector; m_objectName = objectName; m_proxyClass = proxyClass; } /** * {@inheritDoc} */ @Override public T get() throws UnresolvableInstanceException, InstanceUnavailableException { try { JMXConnector connector = m_deferredJMXConnector.get(); if (connector == null) { throw new InstanceUnavailableException(this); } else { MBeanServerConnection connection = connector.getMBeanServerConnection(); return JMX.newMBeanProxy(connection, m_objectName, m_proxyClass); } } catch (IOException e) { // an IOException represents a failed connection attempt throw new InstanceUnavailableException(this, e); } catch (NullPointerException e) { // an NPE would only occur when the server connection isn't available throw new InstanceUnavailableException(this, e); } catch (InstanceUnavailableException e) { throw e; } catch (UnresolvableInstanceException e) { throw e; } catch (Exception e) { throw new UnresolvableInstanceException(this, e); } } /** * {@inheritDoc} */ @Override public Class getDeferredClass() { return m_proxyClass; } /** * {@inheritDoc} */ @Override public String toString() { return String.format("Deferred{on=%s, object=%s, class=%s}", m_deferredJMXConnector, m_objectName, m_proxyClass); } }





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