traininfoservice/banedk/DepartureServlet.java

package dk.thoerup.traininfoservice.banedk;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.TransformerFactory;

import org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;

import dk.thoerup.android.traininfo.common.DepartureBean;
import dk.thoerup.circuitbreaker.CircuitBreakerException;
import dk.thoerup.traininfoservice.Statistics;

/**
 * Servlet implementation class DepartureServlet
 */
@WebServlet(urlPatterns={"/DepartureServlet"})
public class DepartureServlet extends HttpServlet {
        private static final long serialVersionUID = 1L;
        
        Logger logger = Logger.getLogger( DepartureServlet.class.getName() );

        DepartureFetcher fetcher;
    TransformerFactory transformerFactory = TransformerFactory.newInstance();
        DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
        

        @Override
        public void init() throws ServletException {
                super.init();

                boolean useAzureSite =  Boolean.parseBoolean( getServletContext().getInitParameter("useazuresite") );
                int cacheTimeout =  Integer.parseInt( getServletContext().getInitParameter("cache_timeout") );
                int replyTimeout =  Integer.parseInt( getServletContext().getInitParameter("reply_timeout") ); 
                logger.info( "DepartureServlet, use azure site=" + useAzureSite + ", cache=" + cacheTimeout);
                fetcher = new DepartureFetcher(useAzureSite, cacheTimeout, replyTimeout);
        }

        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {           
                if (req.getParameter("station") == null) {
                        resp.sendError(400, "not enough parameters");
                        return;
                }
                
                boolean arrival = false;
                try {
                        arrival = Integer.parseInt( req.getParameter("arrival")) != 0;
                } catch (Exception e) {}
                
                Statistics.getInstance().incrementDepartureLookups();
                
                int station = Integer.parseInt( req.getParameter("station") );
                String format = req.getParameter("format");

                DepartureBean beans;            

                try {
                        beans = fetcher.cachedLookupDepartures(station, arrival);
                } catch (java.io.IOException ioe) {
                        logger.warning("Read failed, station="+station + ". " + ioe.getMessage() );
                        Statistics.getInstance().incrementDepartureErrors();
                        resp.sendError(500);
                        return;
                } catch (CircuitBreakerException cbe) {
                        logger.warning("Circuitbreaker - failing fast");
                        Statistics.getInstance().incrementDepartureErrors();
                        resp.sendError(500);
                        return;
                } catch (Exception e) {                 
                        logger.log(Level.WARNING, "Unknown exception, station=" +station, e);
                        Statistics.getInstance().incrementDepartureErrors();
                        resp.sendError(500);
                        return;
                }
                
                resp.setDateHeader("Expires", 0);
                resp.setHeader("Cache-Control", "no-cache, must-revalidate");
                
                if (format.equalsIgnoreCase("xml")) {
                        resp.setContentType("text/xml");
                        resp.getWriter().print( formatXml(beans, arrival) );
                } else if (format.equalsIgnoreCase("html")) {
                        
                        String advStr = req.getParameter("advanced");
                        boolean advanced = advStr != null ? Boolean.parseBoolean(advStr) : false;
                        
                        req.setAttribute("advanced", advanced);
                        req.setAttribute("departurebeans", beans);
                        req.setAttribute("stationID", station );
                        getServletContext().getRequestDispatcher("/ViewDepartures.jsp").forward(req,resp);
                } else {
                        resp.sendError(400, "Unknown format");                  
                }

        }

        protected String formatXml(DepartureBean beans, boolean arrival) throws ServletException{
                
                Serializer serializer = new Persister();

                ByteArrayOutputStream out = new ByteArrayOutputStream();

                try {
                        serializer.write(beans, out);
                } catch (Exception e) {
                        throw new ServletException(e);
                }
                
                return out.toString();
        }

}
1	torben	307	package dk.thoerup.traininfoservice.banedk;
2
3	torben	1060	import java.io.ByteArrayOutputStream;
4	torben	307	import java.io.IOException;
5	torben	348	import java.util.logging.Level;
6			import java.util.logging.Logger;
7	torben	307
8			import javax.servlet.ServletException;
9	torben	958	import javax.servlet.annotation.WebServlet;
10	torben	307	import javax.servlet.http.HttpServlet;
11			import javax.servlet.http.HttpServletRequest;
12			import javax.servlet.http.HttpServletResponse;
13			import javax.xml.parsers.DocumentBuilderFactory;
14			import javax.xml.transform.TransformerFactory;
15
16	torben	1060	import org.simpleframework.xml.Serializer;
17			import org.simpleframework.xml.core.Persister;
18	torben	307
19	torben	1061	import dk.thoerup.android.traininfo.common.DepartureBean;
20	torben	468	import dk.thoerup.circuitbreaker.CircuitBreakerException;
21	torben	711	import dk.thoerup.traininfoservice.Statistics;
22	torben	307
23			/**
24			* Servlet implementation class DepartureServlet
25			*/
26	torben	958	@WebServlet(urlPatterns={"/DepartureServlet"})
27	torben	307	public class DepartureServlet extends HttpServlet {
28			private static final long serialVersionUID = 1L;
29	torben	348
30			Logger logger = Logger.getLogger( DepartureServlet.class.getName() );
31	torben	307
32	torben	580	DepartureFetcher fetcher;
33	torben	307	TransformerFactory transformerFactory = TransformerFactory.newInstance();
34			DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
35
36
37	torben	425	@Override
38	torben	580	public void init() throws ServletException {
39			super.init();
40	torben	584
41	torben	1034	boolean useAzureSite = Boolean.parseBoolean( getServletContext().getInitParameter("useazuresite") );
42	torben	584	int cacheTimeout = Integer.parseInt( getServletContext().getInitParameter("cache_timeout") );
43	torben	1026	int replyTimeout = Integer.parseInt( getServletContext().getInitParameter("reply_timeout") );
44	torben	1036	logger.info( "DepartureServlet, use azure site=" + useAzureSite + ", cache=" + cacheTimeout);
45	torben	1034	fetcher = new DepartureFetcher(useAzureSite, cacheTimeout, replyTimeout);
46	torben	580	}
47
48			@Override
49	torben	711	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
50	torben	458	if (req.getParameter("station") == null) {
51			resp.sendError(400, "not enough parameters");
52			return;
53			}
54	torben	829
55			boolean arrival = false;
56			try {
57			arrival = Integer.parseInt( req.getParameter("arrival")) != 0;
58			} catch (Exception e) {}
59
60	torben	711	Statistics.getInstance().incrementDepartureLookups();
61	torben	458
62	torben	307	int station = Integer.parseInt( req.getParameter("station") );
63			String format = req.getParameter("format");
64
65	torben	1021	DepartureBean beans;
66	torben	307
67			try {
68	torben	829	beans = fetcher.cachedLookupDepartures(station, arrival);
69	torben	462	} catch (java.io.IOException ioe) {
70			logger.warning("Read failed, station="+station + ". " + ioe.getMessage() );
71	torben	716	Statistics.getInstance().incrementDepartureErrors();
72	torben	348	resp.sendError(500);
73			return;
74	torben	421	} catch (CircuitBreakerException cbe) {
75			logger.warning("Circuitbreaker - failing fast");
76	torben	716	Statistics.getInstance().incrementDepartureErrors();
77	torben	421	resp.sendError(500);
78			return;
79	torben	451	} catch (Exception e) {
80	torben	348	logger.log(Level.WARNING, "Unknown exception, station=" +station, e);
81	torben	716	Statistics.getInstance().incrementDepartureErrors();
82	torben	348	resp.sendError(500);
83			return;
84	torben	307	}
85
86			resp.setDateHeader("Expires", 0);
87			resp.setHeader("Cache-Control", "no-cache, must-revalidate");
88
89			if (format.equalsIgnoreCase("xml")) {
90			resp.setContentType("text/xml");
91	torben	1021	resp.getWriter().print( formatXml(beans, arrival) );
92	torben	307	} else if (format.equalsIgnoreCase("html")) {
93	torben	585
94			String advStr = req.getParameter("advanced");
95			boolean advanced = advStr != null ? Boolean.parseBoolean(advStr) : false;
96
97			req.setAttribute("advanced", advanced);
98	torben	307	req.setAttribute("departurebeans", beans);
99			req.setAttribute("stationID", station );
100			getServletContext().getRequestDispatcher("/ViewDepartures.jsp").forward(req,resp);
101			} else {
102	torben	862	resp.sendError(400, "Unknown format");
103	torben	307	}
104
105			}
106
107	torben	1021	protected String formatXml(DepartureBean beans, boolean arrival) throws ServletException{
108	torben	1060
109			Serializer serializer = new Persister();
110	torben	307
111	torben	1060	ByteArrayOutputStream out = new ByteArrayOutputStream();
112	torben	307
113	torben	1060	try {
114			serializer.write(beans, out);
115	torben	307	} catch (Exception e) {
116			throw new ServletException(e);
117			}
118	torben	1060
119			return out.toString();
120	torben	307	}
121
122			}