/*
 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
 *
 * This software is dual-licensed to you under the MIT License (MIT) and
 * the Universal Permissive License (UPL). See the LICENSE file in the root
 * directory for license terms. You may choose either license, or both.
 */
 
package com.oracle.iot.sample;
 
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleException;
 
/**
 * Activator class for OSGi platform. Refer to the on-line, Oracle IoT Cloud Service
 * Java Client Library documentation for details on how to run a client library
 * sample from an OSGi bundle.
 */
public class SampleActivator implements BundleActivator
{
    /**
     * Implements BundleActivator.start().
     * <p>
     * Note: expects following system properties to be set: 'sample.name', 'sample.args'
     * <p>
     * For example: {@code -Dsample.name=GatewayDeviceSample -Dsample.args="SAMPLE-PROVISING-FILE changeit"}
     * @param context the framework context for the bundle.
     **/
    public void start(BundleContext context) throws Exception
    {
        Thread executeSample = new Thread(new ExecuteSample(context));
        executeSample.setDaemon(true);
        executeSample.start();
    }
 
   /**
     * Implements BundleActivator.stop().
     * @param context the framework context for the bundle.
     **/
    public void stop(BundleContext context) throws Exception
    {
        System.err.println("SampleActivator.stop called");
        String sampleName = System.getProperty("sample.name", "GatewayDeviceSample");
        String classname = "com.oracle.iot.sample."+sampleName;
        Class<?> cls = Class.forName(classname);
        java.lang.reflect.Field f = cls.getDeclaredField("exiting");
        f.set(null, true);
    }
 
    private class ExecuteSample implements Runnable {
        private BundleContext context;
        public ExecuteSample(BundleContext context) { this.context = context; }
        @Override
        public void run() {
            String sampleName = System.getProperty("sample.name", "GatewayDeviceSample");
            String classname = "com.oracle.iot.sample."+sampleName;
            try {
                Class<?> cls = Class.forName(classname);
                java.lang.reflect.Field f = cls.getDeclaredField("isUnderFramework");
                f.set(null, true);
 
                f = cls.getDeclaredField("exiting");
                f.set(null, false);
 
                String[] arguments = System.getProperty("sample.args","").split("\\s+");
 
                @SuppressWarnings("unchecked")
                final java.lang.reflect.Method meth = cls.getMethod("main", String[].class);
                meth.invoke(null, (Object) arguments); // static method doesn't have an instance
 
            } catch(Exception e) {
                try {
                    context.getBundle().stop();
                } catch(BundleException be) {
                }
            }           
        }
    }
}