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/*
 * Copyright (c) 2010 the original author or authors.
 *
 * 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 org.cometd.oort;

import java.io.IOException;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.UnavailableException;
import javax.servlet.http.HttpServletResponse;

/**
 * This servlet initializes and configures and instance of the {@link Seti}
 * user mapper.
 * This servlet must be initialized after an instance the Oort servlet
 * that creates the {@link Oort} instance.
 * Override method {@link #newSeti(Oort, String)} to return a customized
 * instance of {@link Seti}.
 *
 * @see OortMulticastConfigServlet
 */
public class SetiServlet implements Servlet
{
    private ServletConfig _config;

    public ServletConfig getServletConfig()
    {
        return _config;
    }

    public String getServletInfo()
    {
        return SetiServlet.class.toString();
    }

    public void init(ServletConfig config) throws ServletException
    {
        _config = config;

        Oort oort = (Oort)config.getServletContext().getAttribute(Oort.OORT_ATTRIBUTE);
        if (oort == null)
            throw new UnavailableException("Missing " + Oort.OORT_ATTRIBUTE + " attribute");

        try
        {
            Seti seti = newSeti(oort);
            seti.start();
            _config.getServletContext().setAttribute(Seti.SETI_ATTRIBUTE, seti);
        }
        catch (Exception x)
        {
            throw new ServletException(x);
        }
    }

    protected Seti newSeti(Oort oort)
    {
        return new Seti(oort);
    }

    public void destroy()
    {
        try
        {
            Seti seti = (Seti)_config.getServletContext().getAttribute(Seti.SETI_ATTRIBUTE);
            if (seti != null)
                seti.stop();
        }
        catch (Exception x)
        {
            throw new RuntimeException(x);
        }
        finally
        {
            _config.getServletContext().removeAttribute(Seti.SETI_ATTRIBUTE);
        }
    }

    public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException
    {
        HttpServletResponse response = (HttpServletResponse)res;
        response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
    }
}