ContextManager.java

/*
 * (C) Copyright 2006-2010 Nuxeo SA (http://nuxeo.com/) and others.
 *
 * Licensed 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.
 *
 * Contributors:
 *     bstefanescu
 */
package org.nuxeo.runtime.jetty;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletContextListener;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.mortbay.jetty.Handler;
import org.mortbay.jetty.Server;
import org.mortbay.jetty.handler.HandlerCollection;
import org.mortbay.jetty.servlet.Context;
import org.mortbay.jetty.servlet.FilterHolder;
import org.mortbay.jetty.servlet.ServletHolder;
import org.mortbay.jetty.webapp.WebAppContext;

/**
 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
 */
public class ContextManager {

    protected Log log = LogFactory.getLog(ContextManager.class);

    protected Server server;

    protected Map<String, Context> contexts;

    protected Map<String, ServletContextListenerDescriptor> listeners;

    public ContextManager(Server server) {
        this.server = server;
        this.contexts = new HashMap<String, Context>();
        this.listeners = new HashMap<String, ServletContextListenerDescriptor>();
    }

    public Server getServer() {
        return server;
    }

    public synchronized void addFilter(FilterDescriptor descriptor) {
        String path = descriptor.getContext();
        Context ctx = contexts.get(path);
        if (ctx == null) {
            ctx = new Context(server, path, Context.SESSIONS | Context.NO_SECURITY);
            contexts.put(path, ctx);
        }
        FilterHolder holder = new FilterHolder(descriptor.getClazz());
        String name = descriptor.getName();
        if (name != null) {
            holder.setName(name);
        }
        String desc = descriptor.getDescription();
        if (desc != null) {
            holder.setDisplayName(desc);
        }
        Map<String, String> params = descriptor.getInitParams();
        if (params != null) {
            holder.setInitParameters(params);
        }
        ctx.addFilter(holder, descriptor.getPath(), org.mortbay.jetty.Handler.DEFAULT);
    }

    public synchronized void addServlet(ServletDescriptor descriptor) {
        String path = descriptor.getContext();
        Context ctx = contexts.get(path);
        if (ctx == null) {
            ctx = new Context(server, path, Context.SESSIONS | Context.NO_SECURITY);
            contexts.put(path, ctx);
        }
        ServletHolder holder = new ServletHolder(descriptor.getClazz());
        String name = descriptor.getName();
        if (name != null) {
            holder.setName(name);
        }
        String desc = descriptor.getDescription();
        if (desc != null) {
            holder.setDisplayName(desc);
        }
        Map<String, String> params = descriptor.getInitParams();
        if (params != null) {
            holder.setInitParameters(params);
        }
        ctx.addServlet(holder, descriptor.getPath());
    }

    public synchronized void addLifecycleListener(ServletContextListenerDescriptor descriptor) {
        listeners.put(descriptor.name, descriptor);
    }

    public synchronized void removeLifecycleListener(ServletContextListenerDescriptor descriptor) {
        listeners.remove(descriptor.name);
    }

    public synchronized void removeFilter(FilterDescriptor descriptor) {
        // TODO not yet implemented
    }

    public synchronized void removeServlet(ServletDescriptor descriptor) {
        // TODO not yet implemented
    }

    public void applyLifecycleListeners() {
        HandlerCollection hc = (HandlerCollection) server.getHandler();
        Handler[] handlers = hc.getChildHandlersByClass(WebAppContext.class);
        for (ServletContextListenerDescriptor desc : listeners.values()) {
            ServletContextListener listener;
            try {
                listener = desc.clazz.newInstance();
            } catch (ReflectiveOperationException e) {
                log.error("Cannot add life cycle listener " + desc.name, e);
                continue;
            }
            for (Handler handler : handlers) {
                WebAppContext context = (WebAppContext) handler;
                if (context.getContextPath().matches(desc.context)) {
                    context.addEventListener(listener);
                }
            }
        }
    }
}