001/*
002 * (C) Copyright 2006-2010 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bstefanescu
018 */
019package org.nuxeo.ecm.webengine.app.jersey;
020
021import java.io.IOException;
022
023import javax.servlet.ServletException;
024import javax.servlet.http.HttpServletRequest;
025import javax.servlet.http.HttpServletResponse;
026
027import org.nuxeo.ecm.webengine.WebEngine;
028import org.nuxeo.ecm.webengine.jaxrs.Reloadable;
029import org.nuxeo.runtime.api.Framework;
030
031import com.sun.jersey.spi.container.servlet.ServletContainer;
032
033/**
034 * JAX-RS servlet based on jersey servlet to provide hot reloading.
035 * <p>
036 * Use it as the webengine servlet in web.xml if you want hot reload, otherwise use {@link ServletContainer}.
037 *
038 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
039 */
040public class ReloadingJerseyServlet extends ServletContainer implements Reloadable {
041
042    private static final long serialVersionUID = 1L;
043
044    protected WebEngine engine;
045
046    @Override
047    public void init() throws ServletException {
048        super.init();
049        engine = Framework.getLocalService(WebEngine.class);
050    }
051
052    @Override
053    public void destroy() {
054        engine = null;
055        super.destroy();
056    }
057
058    @Override
059    public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
060        if (engine == null) {
061            engine = Framework.getLocalService(WebEngine.class);
062        }
063        String method = request.getMethod().toUpperCase();
064        if (!"GET".equals(method)) {
065            // force reading properties because jersey is consuming one
066            // character
067            // from the input stream - see WebComponent.isEntityPresent.
068            request.getParameterMap();
069        }
070        super.service(request, response);
071    }
072
073    public synchronized void reloadIfNeeded() {
074        if (engine.tryReload()) {
075            reload();
076        }
077    }
078}