org.vaadin7.osgi.VaadinOSGiServlet.java Source code

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Here is the source code for org.vaadin7.osgi.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.
 * 
 * Contributor:
 *       Florian Pirchner - migrating to vaadin 7
 */
package org.vaadin7.osgi;

import java.util.Dictionary;
import java.util.HashSet;
import java.util.Map;
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.DeploymentConfiguration;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinServlet;
import com.vaadin.server.VaadinSession;

/**
 * Used to create instances of applications that have been registered with the
 * container via a component factory.
 * 
 * @author brindy
 */
class VaadinOSGiServlet extends VaadinServlet implements OSGiServletService.IVaadinSessionManager {

    private static final long serialVersionUID = 1L;

    private final ComponentFactory factory;
    private final Map<String, Object> properties;

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

    public VaadinOSGiServlet(ComponentFactory factory, Map<String, Object> properties) {
        this.factory = factory;
        this.properties = properties;
    }

    @Override
    protected OSGiServletService createServletService(DeploymentConfiguration deploymentConfiguration) {
        return new OSGiServletService(this, deploymentConfiguration, this);
    }

    @Override
    public VaadinSession createVaadinSession(VaadinRequest request, HttpServletRequest httpServletRequest) {
        @SuppressWarnings("rawtypes")
        final VaadinSessionInfo info = new VaadinSessionInfo(factory.newInstance((Dictionary) properties),
                httpServletRequest.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 (VaadinSession) info.instance.getInstance();
    }

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

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

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

        final ComponentInstance instance;
        final HttpSession session;

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

        public void dispose() {
            VaadinSessionInfo app = (VaadinSessionInfo) instance.getInstance();
            if (app != null) {
                app.dispose();
            }

            instance.dispose();

            session.removeAttribute(VaadinOSGiServlet.class.getName());
            sessions.remove(this);
        }
    }

}