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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 retrieve JMX information and can survive the absence of JMX.
 */
public interface JmxInfoProvider {
    public long[] getFileDecriptorInfo();
    public int getThreadCount();
    public int getDaemonThreadCount();
    public int getPeakThreadCount();
    public long getTotalStartedThreadCount();
    public long[] findDeadlockedThreads();
    public boolean isEnabled();

    public static class Factory {
        private static final JmxInfoProvider provider;
        static {
            JmxInfoProvider p;
            try {
                Class c = Class.forName("com.amazonaws.jmx.JmxInfoProviderSupport");
                p = (JmxInfoProvider)c.newInstance();
            } catch (Exception e) {
                LogFactory
                    .getLog(JmxInfoProvider.class)
                    .debug("Failed to load the JMX implementation module - JMX is disabled", e);
                p = NONE;
            }
            provider = p;
        }
        public static JmxInfoProvider getJmxInfoProvider() {
            return provider;
        }
    }

    static final JmxInfoProvider NONE = new JmxInfoProvider() {
        @Override
        public long[] getFileDecriptorInfo() {
            return null;
        }

        @Override
        public int getThreadCount() {
            return 0;
        }

        @Override
        public int getDaemonThreadCount() {
            return 0;
        }

        @Override
        public int getPeakThreadCount() {
            return 0;
        }

        @Override
        public long getTotalStartedThreadCount() {
            return 0;
        }

        @Override
        public long[] findDeadlockedThreads() {
            return null;
        }

        @Override
        public boolean isEnabled() {
            return false;
        }
    };
}