traininfoservice/banedk/DepartureServlet.java

package dk.thoerup.traininfoservice.banedk;

import java.io.IOException;
import java.io.StringWriter;
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.transform.Templates;
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.android.traininfo.common.StationBean;
import dk.thoerup.circuitbreaker.CircuitBreakerException;
import dk.thoerup.traininfoservice.Statistics;
import dk.thoerup.traininfoservice.TraininfoSettings;
import dk.thoerup.traininfoservice.banedk.DepartureFetcher.FetchTrainType;
import dk.thoerup.traininfoservice.db.StationDAO;

/**
 * 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 xslTransFact;
        Templates xslTemplate;
        

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


                TraininfoSettings settings = (TraininfoSettings) getServletContext().getAttribute("settings");
                fetcher = new DepartureFetcher(settings);
                
                /*
                xslTransFact = TransformerFactory.newInstance();
                
                String xslPath = getServletContext().getRealPath("/departures.xsl");
                Source stylesheet = new StreamSource( new File(xslPath) );
                
                try {
                        xslTemplate = xslTransFact.newTemplates(stylesheet);
                } catch (Exception e) {
                        throw new ServletException(e);
                }*/
        }

        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {           
                if (req.getParameter("station") == null) {
                        resp.sendError(400, "not enough parameters (station)");
                        return;
                }
                if (req.getParameter("format") == null) {
                        resp.sendError(400, "not enough parameters (format)");
                        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;
                
                DepartureFetcher.FetchTrainType type = FetchTrainType.BOTH;
                if ( req.getParameter("type") != null) {
                        type = FetchTrainType.valueOf( req.getParameter("type") );
                }

                
                try {
                        beans = fetcher.cachedLookupDepartures(station, arrival, type);
                        beans.arrival = arrival;
                } catch (java.io.IOException ioe) {
                        logger.warning("Read failed, station="+station + ". " + ioe.getMessage() );
                        Statistics.getInstance().incrementDepartureErrors();
                        beans = generateErrorBean(1);
                } catch (CircuitBreakerException cbe) {
                        logger.warning("Circuitbreaker - failing fast, station=" +station);
                        Statistics.getInstance().incrementDepartureErrors();
                        beans = generateErrorBean(1);
                } catch (StationDAO.NostationException nse) {
                        logger.log(Level.WARNING, "Station not in Database, station=" +station);
                        Statistics.getInstance().incrementDepartureErrors();
                        resp.sendError(400, "invalid station ID");
                        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) );
                } 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);
                        /*resp.setContentType("text/html");
                        resp.getWriter().print(  xmlToHtml(formatXml(beans))  );*/
                } else {
                        resp.sendError(400, "Unknown format");                  
                }
        }
        
        protected DepartureBean generateErrorBean(int code) {
                DepartureBean bean = new DepartureBean();
                bean.stationName="";
                bean.errorCode = code;
                return bean;
        }

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

                StringWriter out = new StringWriter();

                try {
                        serializer.write(beans, out);
                } catch (Exception e) {
                        throw new ServletException(e);
                }
                
                return out.toString();
        }
        /*
        protected String xmlToHtml(String input) throws ServletException {

                try {                                   
                        Transformer trans = xslTemplate.newTransformer();
                        
                
                        Source xml = new StreamSource( new StringReader(input));
                        StringWriter out = new StringWriter();
                        trans.transform(xml, new StreamResult(out));            
                
                        return out.toString();
                } catch (Exception e) {
                        throw new ServletException(e);
                }
        }*/

}
1	torben	307	package dk.thoerup.traininfoservice.banedk;
2
3			import java.io.IOException;
4	torben	1190	import java.io.StringWriter;
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	torben	1091	import javax.xml.transform.Templates;
14	torben	307	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	1373	import dk.thoerup.android.traininfo.common.StationBean;
21	torben	468	import dk.thoerup.circuitbreaker.CircuitBreakerException;
22	torben	711	import dk.thoerup.traininfoservice.Statistics;
23	torben	1303	import dk.thoerup.traininfoservice.TraininfoSettings;
24	torben	1248	import dk.thoerup.traininfoservice.banedk.DepartureFetcher.FetchTrainType;
25	torben	1255	import dk.thoerup.traininfoservice.db.StationDAO;
26	torben	307
27			/**
28			* Servlet implementation class DepartureServlet
29			*/
30	torben	958	@WebServlet(urlPatterns={"/DepartureServlet"})
31	torben	307	public class DepartureServlet extends HttpServlet {
32			private static final long serialVersionUID = 1L;
33	torben	348
34			Logger logger = Logger.getLogger( DepartureServlet.class.getName() );
35	torben	307
36	torben	580	DepartureFetcher fetcher;
37	torben	1075
38
39	torben	307
40	torben	1091	TransformerFactory xslTransFact;
41			Templates xslTemplate;
42	torben	1075
43	torben	307
44	torben	425	@Override
45	torben	580	public void init() throws ServletException {
46			super.init();
47	torben	584
48	torben	1303
49			TraininfoSettings settings = (TraininfoSettings) getServletContext().getAttribute("settings");
50			fetcher = new DepartureFetcher(settings);
51	torben	1075
52	torben	1253	/*
53	torben	1091	xslTransFact = TransformerFactory.newInstance();
54
55			String xslPath = getServletContext().getRealPath("/departures.xsl");
56			Source stylesheet = new StreamSource( new File(xslPath) );
57
58			try {
59			xslTemplate = xslTransFact.newTemplates(stylesheet);
60			} catch (Exception e) {
61			throw new ServletException(e);
62	torben	1253	}*/
63	torben	580	}
64
65			@Override
66	torben	711	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
67	torben	458	if (req.getParameter("station") == null) {
68	torben	1168	resp.sendError(400, "not enough parameters (station)");
69	torben	458	return;
70			}
71	torben	1168	if (req.getParameter("format") == null) {
72			resp.sendError(400, "not enough parameters (format)");
73			return;
74			}
75	torben	829
76			boolean arrival = false;
77			try {
78			arrival = Integer.parseInt( req.getParameter("arrival")) != 0;
79			} catch (Exception e) {}
80
81	torben	711	Statistics.getInstance().incrementDepartureLookups();
82	torben	458
83	torben	307	int station = Integer.parseInt( req.getParameter("station") );
84			String format = req.getParameter("format");
85
86	torben	1248	DepartureBean beans;
87
88			DepartureFetcher.FetchTrainType type = FetchTrainType.BOTH;
89			if ( req.getParameter("type") != null) {
90			type = FetchTrainType.valueOf( req.getParameter("type") );
91			}
92	torben	307
93	torben	1373
94	torben	307	try {
95	torben	1248	beans = fetcher.cachedLookupDepartures(station, arrival, type);
96	torben	1074	beans.arrival = arrival;
97	torben	462	} catch (java.io.IOException ioe) {
98			logger.warning("Read failed, station="+station + ". " + ioe.getMessage() );
99	torben	716	Statistics.getInstance().incrementDepartureErrors();
100	torben	1373	beans = generateErrorBean(1);
101	torben	421	} catch (CircuitBreakerException cbe) {
102	torben	1158	logger.warning("Circuitbreaker - failing fast, station=" +station);
103	torben	716	Statistics.getInstance().incrementDepartureErrors();
104	torben	1373	beans = generateErrorBean(1);
105	torben	1145	} catch (StationDAO.NostationException nse) {
106			logger.log(Level.WARNING, "Station not in Database, station=" +station);
107			Statistics.getInstance().incrementDepartureErrors();
108			resp.sendError(400, "invalid station ID");
109			return;
110	torben	451	} catch (Exception e) {
111	torben	348	logger.log(Level.WARNING, "Unknown exception, station=" +station, e);
112	torben	716	Statistics.getInstance().incrementDepartureErrors();
113	torben	348	resp.sendError(500);
114			return;
115	torben	307	}
116
117			resp.setDateHeader("Expires", 0);
118			resp.setHeader("Cache-Control", "no-cache, must-revalidate");
119
120			if (format.equalsIgnoreCase("xml")) {
121			resp.setContentType("text/xml");
122	torben	1074	resp.getWriter().print( formatXml(beans) );
123	torben	307	} else if (format.equalsIgnoreCase("html")) {
124	torben	1206
125	torben	585	String advStr = req.getParameter("advanced");
126			boolean advanced = advStr != null ? Boolean.parseBoolean(advStr) : false;
127
128			req.setAttribute("advanced", advanced);
129	torben	307	req.setAttribute("departurebeans", beans);
130			req.setAttribute("stationID", station );
131	torben	1206	getServletContext().getRequestDispatcher("/ViewDepartures.jsp").forward(req,resp);
132			/*resp.setContentType("text/html");
133			resp.getWriter().print( xmlToHtml(formatXml(beans)) );*/
134	torben	307	} else {
135	torben	862	resp.sendError(400, "Unknown format");
136	torben	307	}
137			}
138	torben	1373
139			protected DepartureBean generateErrorBean(int code) {
140			DepartureBean bean = new DepartureBean();
141			bean.stationName="";
142			bean.errorCode = code;
143			return bean;
144			}
145	torben	307
146	torben	1074	protected String formatXml(DepartureBean beans) throws ServletException{
147	torben	1060
148			Serializer serializer = new Persister();
149	torben	307
150	torben	1190	StringWriter out = new StringWriter();
151	torben	307
152	torben	1060	try {
153			serializer.write(beans, out);
154	torben	307	} catch (Exception e) {
155			throw new ServletException(e);
156			}
157	torben	1060
158			return out.toString();
159	torben	307	}
160	torben	1253	/*
161	torben	1091	protected String xmlToHtml(String input) throws ServletException {
162	torben	307
163	torben	1091	try {
164	torben	1191	Transformer trans = xslTemplate.newTransformer();
165
166	torben	1075
167	torben	1191	Source xml = new StreamSource( new StringReader(input));
168	torben	1190	StringWriter out = new StringWriter();
169	torben	1075	trans.transform(xml, new StreamResult(out));
170
171			return out.toString();
172			} catch (Exception e) {
173	torben	1091	throw new ServletException(e);
174	torben	1075	}
175	torben	1253	}*/
176	torben	1075
177	torben	307	}