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The Amazon Web Services SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2011-2014 Amazon Technologies, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *    http://aws.amazon.com/apache2.0
 *
 * This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES
 * OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and
 * limitations under the License.
 */
package com.amazonaws.jmx.spi;

import org.apache.commons.logging.LogFactory;

/**
 * SPI used to register MBeans and can survive the absence of JMX.
 */
public interface SdkMBeanRegistry {
    /**
     * Returns true if the registration of the admin MBean under the given
     * object name succeeded; false otherwise.
     */
    public boolean registerMetricAdminMBean(String objectName);

    /**
     * Returns true if the unregistration of the MBean under the given object
     * name succeeded; false otherwise.
     */
    public boolean unregisterMBean(String objectName);

    /**
     * Returns true if the the MBean under the given object name is currently
     * registered; false otherwise.
     */
    public boolean isMBeanRegistered(String objectName);

    public static class Factory {
        private static final SdkMBeanRegistry registry;
        static {
            SdkMBeanRegistry rego;
            try {
                Class c = Class.forName("com.amazonaws.jmx.SdkMBeanRegistrySupport");
                rego = (SdkMBeanRegistry)c.newInstance();
            } catch (Exception e) {
                LogFactory
                    .getLog(SdkMBeanRegistry.class)
                    .debug("Failed to load the JMX implementation module - JMX is disabled", e);
                rego = NONE;
            }
            registry = rego;
        }
        public static SdkMBeanRegistry getMBeanRegistry() {
            return registry;
        }
    }
    
    static final SdkMBeanRegistry NONE = new SdkMBeanRegistry() {
        @Override public boolean registerMetricAdminMBean(String objectName) {
            return false;
        }
        @Override public boolean unregisterMBean(String objectName) {
            return false;
        }
        @Override public boolean isMBeanRegistered(String objectName) {
            return false;
        }
    };
}