org.lunifera.web.vaadin.servlet.VaadinOSGiServlet.java Source code

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Here is the source code for org.lunifera.web.vaadin.servlet.VaadinOSGiServlet.java

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/*
 * 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.
 * 
 * Based on org.vaadin.osgi.VaadinOSGiServlet.
 */
package org.lunifera.web.vaadin.servlet;

import java.util.HashSet;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

import org.osgi.service.component.ComponentFactory;
import org.osgi.service.component.ComponentInstance;

import com.vaadin.server.VaadinServlet;
import com.vaadin.server.VaadinServletSession;

/**
 * Information: This class was originally written by chris brind and copied to
 * this bundle. See "org.vaadin.osgi.VaadinOSGiServlet".
 * 
 * Used to create instances of applications that have been registered with the
 * container via a component factory.
 */
@SuppressWarnings({ "serial", "deprecation" })
public class VaadinOSGiServlet extends VaadinServlet {

    private final ComponentFactory factory;

    private Set<VaadinSession> sessions = new HashSet<VaadinSession>();

    public VaadinOSGiServlet(ComponentFactory factory) {
        this.factory = factory;
    }

    protected VaadinServletSession doCreateVaadinSession(HttpServletRequest request) {
        final VaadinSession info = new VaadinSession(factory.newInstance(null), request.getSession());

        info.session.setAttribute(VaadinOSGiServlet.class.getName(), new HttpSessionListener() {

            @Override
            public void sessionDestroyed(HttpSessionEvent arg0) {
                info.dispose();
            }

            @Override
            public void sessionCreated(HttpSessionEvent arg0) {

            }

        });
        System.out.println("Ready: " + info); //$NON-NLS-1$
        return (VaadinServletSession) info.instance.getInstance();

    }

    @Override
    public void destroy() {
        super.destroy();

        HashSet<VaadinSession> sessions = new HashSet<VaadinSession>();
        sessions.addAll(this.sessions);
        this.sessions.clear();
        for (VaadinSession info : sessions) {
            info.dispose();
        }
    }

    /**
     * Track the component instance and session. If this is disposed the entire
     * associated http session is also disposed.
     */
    class VaadinSession {

        final ComponentInstance instance;

        final HttpSession session;

        public VaadinSession(ComponentInstance instance, HttpSession session) {
            this.instance = instance;
            this.session = session;
            sessions.add(this);
        }

        public void dispose() {
            System.out.println("Disposing: " + this); //$NON-NLS-1$
            VaadinSession app = (VaadinSession) instance.getInstance();
            if (app != null) {
                app.dispose();
            }

            instance.dispose();

            session.removeAttribute(VaadinOSGiServlet.class.getName());

            sessions.remove(this);
        }

    }

}