simplebundle.java

OSGI 的 源码实现,采用JAVA书写

/*
 * Simple Example Bundle
 * Copyright (c) 2004, Richard S. Hall
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *   * Neither the name of the ungoverned.org nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Contact: Richard S. Hall ([e-mail])
 * Contributor(s):
 *
**/
package org.ungoverned.osgi.bundle.simple;

import javax.servlet.Servlet;

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.ungoverned.osgi.bundle.simple.embedded.Embedded;

/**
 * A very simple bundle that prints out a message when it is started and
 * stopped; it includes an embedded JAR file which is used on its internal
 * class path. This bundle is merely a "hello world" example; it does not
 * implement any services nor does it offer any configurable properties.
**/
public class SimpleBundle implements BundleActivator
{
    private BundleContext context = null;

    public native String foo();

    public void start(BundleContext context) throws Exception
    {
        System.out.println("Simple Bundle " + context.getBundle().getBundleId()
            + " has started.");

        this.context = context;

        // Get the OS and processor properties.
        String os =
            context.getProperty("org.osgi.framework.os.name").toLowerCase();
        String processor =
            context.getProperty("org.osgi.framework.processor").toLowerCase();

        // Load library if correct platform.
        if (os.equals("linux") && processor.endsWith("86"))
        {
            try {
                System.loadLibrary("foo");
            } catch (Exception ex) {
                System.out.println("No library: " + ex);
                ex.printStackTrace();
            }
            System.out.println("From native: " + foo());
        }

        // Create class from embedded JAR file.
        Embedded embedded = new Embedded();
        embedded.sayHello();

        // Access dynamically imported servlet class.
        try {
            System.out.println("Resource = " + getClass().getResource("/javax/servlet/Servlet.class"));
        } catch (Throwable ex) {
            System.out.println("The 'javax.servlet' package is not available.");
        }
        try {
            System.out.println("Class name = " + javax.servlet.http.HttpSession.class);
        } catch (Throwable ex) {
            System.out.println("The 'javax.servlet.http' package is not available.");
        }
        try {
            System.out.println("Class name = " + Servlet.class);
        } catch (Throwable ex) {
            System.out.println("The 'javax.servlet' package is not available.");
        }
    }

    public void stop(BundleContext context)
    {
        System.out.println("Simple Bundle " + context.getBundle().getBundleId()
            + " has stopped.");
    }
}