//
//  ========================================================================
//  Copyright (c) 1995-2020 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.demo;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.Map;
import java.util.ServiceLoader;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;

import org.osgi.framework.Constants;
import org.osgi.framework.launch.Framework;
import org.osgi.framework.launch.FrameworkFactory;

@WebListener
public class AppListener implements ServletContextListener
{
    public void contextInitialized(ServletContextEvent sce)
    {
        Framework framework = initFelix();
        sce.getServletContext().setAttribute(Framework.class.getName(), framework);
    }

    private Framework initFelix()
    {
        Map<String, String> properties = new HashMap<>();

        try
        {
            Path cacheDir = Files.createTempDirectory("felix-cache");
            properties.put(Constants.FRAMEWORK_STORAGE, cacheDir.toAbsolutePath().toString());
            properties.put(Constants.FRAMEWORK_STORAGE_CLEAN, Constants.FRAMEWORK_STORAGE_CLEAN_ONFIRSTINIT);
            properties.put(Constants.FRAMEWORK_BUNDLE_PARENT, Constants.FRAMEWORK_BUNDLE_PARENT_FRAMEWORK);
            properties.put(Constants.FRAMEWORK_BOOTDELEGATION, "*");
        }
        catch (IOException e)
        {
            throw new RuntimeException("Unable to configure Felix", e);
        }

        Framework framework = ServiceLoader.load(FrameworkFactory.class).iterator().next().newFramework(properties);

        try
        {
            System.err.println("Initializing felix");
            framework.init();
            System.err.println("Starting felix");
            framework.start();
        }
        catch (Exception e)
        {
            e.printStackTrace(System.err);
            throw new RuntimeException("Unable to start Felix", e);
        }

        return framework;
    }

    public void contextDestroyed(ServletContextEvent sce)
    {
    }
}
