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// 
// ========================================================================
// Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// 
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// 
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// 
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
// 
package org.eclipse.jetty.util;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 *  Provide for a Uptime class that is compatible with Android, GAE, and the new Java 8 compact profiles
 *
 * @deprecated The Eclipse Jetty and Apache Felix Http Jetty packages are no longer supported.
 */
@Deprecated(since = "2021-05-27")
public class Uptime {

    public static final int NOIMPL = -1;

    // @deprecated The Eclipse Jetty and Apache Felix Http Jetty packages are no longer supported.
    @Deprecated(since = "2021-05-27")
    public interface Impl {

        long getUptime();
    }

    // @deprecated The Eclipse Jetty and Apache Felix Http Jetty packages are no longer supported.
    @Deprecated(since = "2021-05-27")
    public static class DefaultImpl implements Impl {

        public Object mxBean;

        public Method uptimeMethod;

        public DefaultImpl() {
            ClassLoader cl = Thread.currentThread().getContextClassLoader();
            try {
                Class mgmtFactory = Class.forName("java.lang.management.ManagementFactory", true, cl);
                Class runtimeClass = Class.forName("java.lang.management.RuntimeMXBean", true, cl);
                Class[] noparams = new Class[0];
                Method mxBeanMethod = mgmtFactory.getMethod("getRuntimeMXBean", noparams);
                if (mxBeanMethod == null) {
                    throw new UnsupportedOperationException("method getRuntimeMXBean() not found");
                }
                mxBean = mxBeanMethod.invoke(mgmtFactory);
                if (mxBean == null) {
                    throw new UnsupportedOperationException("getRuntimeMXBean() method returned null");
                }
                uptimeMethod = runtimeClass.getMethod("getUptime", noparams);
                if (mxBean == null) {
                    throw new UnsupportedOperationException("method getUptime() not found");
                }
            } catch (ClassNotFoundException | NoClassDefFoundError | NoSuchMethodException | SecurityException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
                throw new UnsupportedOperationException("Implementation not available in this environment", e);
            }
        }

        @Override
        public long getUptime() {
            try {
                return (long) uptimeMethod.invoke(mxBean);
            } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
                return NOIMPL;
            }
        }
    }

    private static final Uptime INSTANCE = new Uptime();

    public static Uptime getInstance() {
        return INSTANCE;
    }

    private Impl impl;

    private Uptime() {
        try {
            impl = new DefaultImpl();
        } catch (UnsupportedOperationException e) {
            System.err.printf("Defaulting Uptime to NOIMPL due to (%s) %s%n", e.getClass().getName(), e.getMessage());
            impl = null;
        }
    }

    public Impl getImpl() {
        return impl;
    }

    public void setImpl(Impl impl) {
        this.impl = impl;
    }

    public static long getUptime() {
        Uptime u = getInstance();
        if (u == null || u.impl == null) {
            return NOIMPL;
        }
        return u.impl.getUptime();
    }
}