net.hillsdon.reviki.web.dispatching.impl.DispatcherServlet.java Source code

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Here is the source code for net.hillsdon.reviki.web.dispatching.impl.DispatcherServlet.java

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/**
 * Copyright 2008 Matthew Hillsdon
 *
 * 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.
 */
package net.hillsdon.reviki.web.dispatching.impl;

import java.io.IOException;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.hillsdon.reviki.di.ApplicationSession;
import net.hillsdon.reviki.web.dispatching.Dispatcher;

import org.apache.lucene.search.BooleanQuery;
import org.picocontainer.PicoBuilder;

/**
 * We should probably find a web framework that doesn't suck but this'll do for now.
 *
 * @author mth
 */
public class DispatcherServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    private Dispatcher _dispatcher;

    @Override
    public void init(final ServletConfig config) throws ServletException {
        super.init(config);
        // This package cycle is fundamental... I figure we'd fix it by
        // putting the impl class name in the web.xml so this is a reasonable
        // temporary step to get back to zero cycles.
        try {
            final ApplicationSession applicationSession = new PicoBuilder().build()
                    .addComponent(Class.forName("net.hillsdon.reviki.di.impl.ApplicationSessionImpl"))
                    .addComponent(config).addComponent(config.getServletContext())
                    .getComponent(ApplicationSession.class);
            applicationSession.start();
            _dispatcher = applicationSession.getDispatcher();

            // Default limit of 1024 clauses was too small in some cases (e.g. when searching for "story").
            // Therefore this limit was increased in r1202, to allow searching for common terms.
            // This limit was tested on search with 2500 results and worked well.
            // Should be more than enough for the internal wikis at the moment.
            BooleanQuery.setMaxClauseCount(4096);
        } catch (ClassNotFoundException e) {
            throw new ServletException("Root session class not found", e);
        }
    }

    @Override
    protected void service(final HttpServletRequest request, final HttpServletResponse response)
            throws ServletException, IOException {
        request.getSession();
        _dispatcher.handle(request, response);
    }

}