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 || req.getParameter("station").equals("") ) {
                        resp.sendError(400, "not enough parameters (station)");
                        return;
                }
                if (req.getParameter("format") == null || req.getParameter("format").equals("")) {
                        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();
                        resp.sendError(500, "backend didnt answer");
                        return;
                } 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	package dk.thoerup.traininfoservice.banedk;
2
3	import java.io.IOException;
4	import java.io.StringWriter;
5	import java.util.logging.Level;
6	import java.util.logging.Logger;
7
8	import javax.servlet.ServletException;
9	import javax.servlet.annotation.WebServlet;
10	import javax.servlet.http.HttpServlet;
11	import javax.servlet.http.HttpServletRequest;
12	import javax.servlet.http.HttpServletResponse;
13	import javax.xml.transform.Templates;
14	import javax.xml.transform.TransformerFactory;
15
16	import org.simpleframework.xml.Serializer;
17	import org.simpleframework.xml.core.Persister;
18
19	import dk.thoerup.android.traininfo.common.DepartureBean;
20	import dk.thoerup.android.traininfo.common.StationBean;
21	import dk.thoerup.circuitbreaker.CircuitBreakerException;
22	import dk.thoerup.traininfoservice.Statistics;
23	import dk.thoerup.traininfoservice.TraininfoSettings;
24	import dk.thoerup.traininfoservice.banedk.DepartureFetcher.FetchTrainType;
25	import dk.thoerup.traininfoservice.db.StationDAO;
26
27	/**
28	* Servlet implementation class DepartureServlet
29	*/
30	@WebServlet(urlPatterns={"/DepartureServlet"})
31	public class DepartureServlet extends HttpServlet {
32	private static final long serialVersionUID = 1L;
33
34	Logger logger = Logger.getLogger( DepartureServlet.class.getName() );
35
36	DepartureFetcher fetcher;
37
38
39
40	TransformerFactory xslTransFact;
41	Templates xslTemplate;
42
43
44	@Override
45	public void init() throws ServletException {
46	super.init();
47
48
49	TraininfoSettings settings = (TraininfoSettings) getServletContext().getAttribute("settings");
50	fetcher = new DepartureFetcher(settings);
51
52	/*
53	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	}*/
63	}
64
65	@Override
66	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
67	if (req.getParameter("station") == null \|\| req.getParameter("station").equals("") ) {
68	resp.sendError(400, "not enough parameters (station)");
69	return;
70	}
71	if (req.getParameter("format") == null \|\| req.getParameter("format").equals("")) {
72	resp.sendError(400, "not enough parameters (format)");
73	return;
74	}
75
76	boolean arrival = false;
77	try {
78	arrival = Integer.parseInt( req.getParameter("arrival")) != 0;
79	} catch (Exception e) {}
80
81	Statistics.getInstance().incrementDepartureLookups();
82
83	int station = Integer.parseInt( req.getParameter("station") );
84	String format = req.getParameter("format");
85
86	DepartureBean beans;
87
88	DepartureFetcher.FetchTrainType type = FetchTrainType.BOTH;
89	if ( req.getParameter("type") != null) {
90	type = FetchTrainType.valueOf( req.getParameter("type") );
91	}
92
93
94	try {
95	beans = fetcher.cachedLookupDepartures(station, arrival, type);
96	beans.arrival = arrival;
97	} catch (java.io.IOException ioe) {
98	logger.warning("Read failed, station="+station + ". " + ioe.getMessage() );
99	Statistics.getInstance().incrementDepartureErrors();
100	resp.sendError(500, "backend didnt answer");
101	return;
102	} catch (CircuitBreakerException cbe) {
103	logger.warning("Circuitbreaker - failing fast, station=" +station);
104	Statistics.getInstance().incrementDepartureErrors();
105	beans = generateErrorBean(1);
106	} catch (StationDAO.NostationException nse) {
107	logger.log(Level.WARNING, "Station not in Database, station=" +station);
108	Statistics.getInstance().incrementDepartureErrors();
109	resp.sendError(400, "invalid station ID");
110	return;
111	} catch (Exception e) {
112	logger.log(Level.WARNING, "Unknown exception, station=" +station, e);
113	Statistics.getInstance().incrementDepartureErrors();
114	resp.sendError(500);
115	return;
116	}
117
118	resp.setDateHeader("Expires", 0);
119	resp.setHeader("Cache-Control", "no-cache, must-revalidate");
120
121	if (format.equalsIgnoreCase("xml")) {
122	resp.setContentType("text/xml");
123	resp.getWriter().print( formatXml(beans) );
124	} else if (format.equalsIgnoreCase("html")) {
125
126	String advStr = req.getParameter("advanced");
127	boolean advanced = advStr != null ? Boolean.parseBoolean(advStr) : false;
128
129	req.setAttribute("advanced", advanced);
130	req.setAttribute("departurebeans", beans);
131	req.setAttribute("stationID", station );
132	getServletContext().getRequestDispatcher("/ViewDepartures.jsp").forward(req,resp);
133	/*resp.setContentType("text/html");
134	resp.getWriter().print( xmlToHtml(formatXml(beans)) );*/
135	} else {
136	resp.sendError(400, "Unknown format");
137	}
138	}
139
140	protected DepartureBean generateErrorBean(int code) {
141	DepartureBean bean = new DepartureBean();
142	bean.stationName="";
143	bean.errorCode = code;
144	return bean;
145	}
146
147	protected String formatXml(DepartureBean beans) throws ServletException{
148
149	Serializer serializer = new Persister();
150
151	StringWriter out = new StringWriter();
152
153	try {
154	serializer.write(beans, out);
155	} catch (Exception e) {
156	throw new ServletException(e);
157	}
158
159	return out.toString();
160	}
161	/*
162	protected String xmlToHtml(String input) throws ServletException {
163
164	try {
165	Transformer trans = xslTemplate.newTransformer();
166
167
168	Source xml = new StreamSource( new StringReader(input));
169	StringWriter out = new StringWriter();
170	trans.transform(xml, new StreamResult(out));
171
172	return out.toString();
173	} catch (Exception e) {
174	throw new ServletException(e);
175	}
176	}*/
177
178	}