examples/simple/src/org/apache/felix/examples/simple/Activator.java

/* 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License 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 org.apache.felix.examples.simple;

import javax.servlet.Servlet;

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.apache.felix.examples.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 Activator 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("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.");
    }
}