traininfoservice/banedk/DepartureServlet.java

package dk.thoerup.traininfoservice.banedk;

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.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

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{
                String xml = "";
                try {
                        DocumentBuilder builder = docBuilderFactory.newDocumentBuilder();
                        DOMImplementation impl = builder.getDOMImplementation();

                        
                        Document doc = impl.createDocument(null,null,null);
                Element root = doc.createElement("departureinfo");
                root.setAttribute("station", beans.getStationName());
                root.setAttribute("arrival", Boolean.toString(arrival) );
                
                for (String notif : beans.notifications) {
                        Element notElem = doc.createElement("notification");
                        notElem.setTextContent(notif);
                        root.appendChild(notElem); 
                }
                
                for (DepartureEntry departure : beans.departureEntries) {
                        Element train = doc.createElement("train");
                        
                        Element time = doc.createElement("time");
                        time.setTextContent( departure.getTime() );
                        train.appendChild(time);
                        
                        Element updated = doc.createElement("updated");
                        updated.setTextContent( String.valueOf(departure.getUpdated()) );
                        train.appendChild(updated);
                        
                        Element trainNumber = doc.createElement("trainnumber");
                        trainNumber.setTextContent( departure.getTrainNumber() );
                        train.appendChild(trainNumber);
                        
                        Element destination = doc.createElement("destination");
                        destination.setTextContent( departure.getDestination());
                        train.appendChild(destination);
                        
                        Element origin = doc.createElement("origin");
                        origin.setTextContent( departure.getOrigin() );
                        train.appendChild(origin);
                        
                        Element location= doc.createElement("location");
                        location.setTextContent( departure.getLocation() );
                        train.appendChild(location);
                        
                        Element status = doc.createElement("status");
                        status.setTextContent( departure.getStatus() );
                        train.appendChild(status);
                        
                        Element note = doc.createElement("note");
                        note.setTextContent( departure.getNote() );
                        train.appendChild(note);
                        
                        Element type = doc.createElement("type");
                        type.setTextContent( departure.getType() );
                        train.appendChild(type);
                        
                        root.appendChild(train);
                }
                
                doc.appendChild(root);
                
                
                DOMSource domSource = new DOMSource(doc);

                Transformer transformer = transformerFactory.newTransformer();
                //transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
                transformer.setOutputProperty(OutputKeys.METHOD, "xml");
                transformer.setOutputProperty(OutputKeys.ENCODING,"ISO-8859-1");
                transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "1");
                transformer.setOutputProperty(OutputKeys.INDENT, "yes");
                java.io.StringWriter sw = new java.io.StringWriter();
                StreamResult sr = new StreamResult(sw);
                transformer.transform(domSource, sr);
                xml = sw.toString();


                } catch (Exception e) {
                        throw new ServletException(e);
                }
                return xml;
        }

}
1	torben	307	package dk.thoerup.traininfoservice.banedk;
2
3			import java.io.IOException;
4	torben	348	import java.util.logging.Level;
5			import java.util.logging.Logger;
6	torben	307
7			import javax.servlet.ServletException;
8	torben	958	import javax.servlet.annotation.WebServlet;
9	torben	307	import javax.servlet.http.HttpServlet;
10			import javax.servlet.http.HttpServletRequest;
11			import javax.servlet.http.HttpServletResponse;
12			import javax.xml.parsers.DocumentBuilder;
13			import javax.xml.parsers.DocumentBuilderFactory;
14			import javax.xml.transform.OutputKeys;
15			import javax.xml.transform.Transformer;
16			import javax.xml.transform.TransformerFactory;
17			import javax.xml.transform.dom.DOMSource;
18			import javax.xml.transform.stream.StreamResult;
19
20			import org.w3c.dom.DOMImplementation;
21			import org.w3c.dom.Document;
22			import org.w3c.dom.Element;
23
24	torben	468	import dk.thoerup.circuitbreaker.CircuitBreakerException;
25	torben	711	import dk.thoerup.traininfoservice.Statistics;
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	307	TransformerFactory transformerFactory = TransformerFactory.newInstance();
38			DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
39
40
41	torben	425	@Override
42	torben	580	public void init() throws ServletException {
43			super.init();
44	torben	584
45	torben	1034	boolean useAzureSite = Boolean.parseBoolean( getServletContext().getInitParameter("useazuresite") );
46	torben	584	int cacheTimeout = Integer.parseInt( getServletContext().getInitParameter("cache_timeout") );
47	torben	1026	int replyTimeout = Integer.parseInt( getServletContext().getInitParameter("reply_timeout") );
48	torben	1036	logger.info( "DepartureServlet, use azure site=" + useAzureSite + ", cache=" + cacheTimeout);
49	torben	1034	fetcher = new DepartureFetcher(useAzureSite, cacheTimeout, replyTimeout);
50	torben	580	}
51
52			@Override
53	torben	711	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
54	torben	458	if (req.getParameter("station") == null) {
55			resp.sendError(400, "not enough parameters");
56			return;
57			}
58	torben	829
59			boolean arrival = false;
60			try {
61			arrival = Integer.parseInt( req.getParameter("arrival")) != 0;
62			} catch (Exception e) {}
63
64	torben	711	Statistics.getInstance().incrementDepartureLookups();
65	torben	458
66	torben	307	int station = Integer.parseInt( req.getParameter("station") );
67			String format = req.getParameter("format");
68
69	torben	1021	DepartureBean beans;
70	torben	307
71			try {
72	torben	829	beans = fetcher.cachedLookupDepartures(station, arrival);
73	torben	462	} catch (java.io.IOException ioe) {
74			logger.warning("Read failed, station="+station + ". " + ioe.getMessage() );
75	torben	716	Statistics.getInstance().incrementDepartureErrors();
76	torben	348	resp.sendError(500);
77			return;
78	torben	421	} catch (CircuitBreakerException cbe) {
79			logger.warning("Circuitbreaker - failing fast");
80	torben	716	Statistics.getInstance().incrementDepartureErrors();
81	torben	421	resp.sendError(500);
82			return;
83	torben	451	} catch (Exception e) {
84	torben	348	logger.log(Level.WARNING, "Unknown exception, station=" +station, e);
85	torben	716	Statistics.getInstance().incrementDepartureErrors();
86	torben	348	resp.sendError(500);
87			return;
88	torben	307	}
89
90			resp.setDateHeader("Expires", 0);
91			resp.setHeader("Cache-Control", "no-cache, must-revalidate");
92
93			if (format.equalsIgnoreCase("xml")) {
94			resp.setContentType("text/xml");
95	torben	1021	resp.getWriter().print( formatXml(beans, arrival) );
96	torben	307	} else if (format.equalsIgnoreCase("html")) {
97	torben	585
98			String advStr = req.getParameter("advanced");
99			boolean advanced = advStr != null ? Boolean.parseBoolean(advStr) : false;
100
101			req.setAttribute("advanced", advanced);
102	torben	307	req.setAttribute("departurebeans", beans);
103			req.setAttribute("stationID", station );
104			getServletContext().getRequestDispatcher("/ViewDepartures.jsp").forward(req,resp);
105			} else {
106	torben	862	resp.sendError(400, "Unknown format");
107	torben	307	}
108
109			}
110
111	torben	1021	protected String formatXml(DepartureBean beans, boolean arrival) throws ServletException{
112	torben	307	String xml = "";
113			try {
114			DocumentBuilder builder = docBuilderFactory.newDocumentBuilder();
115			DOMImplementation impl = builder.getDOMImplementation();
116
117
118			Document doc = impl.createDocument(null,null,null);
119			Element root = doc.createElement("departureinfo");
120	torben	1021	root.setAttribute("station", beans.getStationName());
121	torben	969	root.setAttribute("arrival", Boolean.toString(arrival) );
122	torben	978
123			for (String notif : beans.notifications) {
124			Element notElem = doc.createElement("notification");
125			notElem.setTextContent(notif);
126			root.appendChild(notElem);
127			}
128
129			for (DepartureEntry departure : beans.departureEntries) {
130	torben	307	Element train = doc.createElement("train");
131
132			Element time = doc.createElement("time");
133			time.setTextContent( departure.getTime() );
134			train.appendChild(time);
135
136			Element updated = doc.createElement("updated");
137			updated.setTextContent( String.valueOf(departure.getUpdated()) );
138			train.appendChild(updated);
139
140			Element trainNumber = doc.createElement("trainnumber");
141			trainNumber.setTextContent( departure.getTrainNumber() );
142			train.appendChild(trainNumber);
143
144			Element destination = doc.createElement("destination");
145			destination.setTextContent( departure.getDestination());
146			train.appendChild(destination);
147
148			Element origin = doc.createElement("origin");
149			origin.setTextContent( departure.getOrigin() );
150			train.appendChild(origin);
151
152			Element location= doc.createElement("location");
153			location.setTextContent( departure.getLocation() );
154			train.appendChild(location);
155
156			Element status = doc.createElement("status");
157			status.setTextContent( departure.getStatus() );
158			train.appendChild(status);
159
160			Element note = doc.createElement("note");
161			note.setTextContent( departure.getNote() );
162			train.appendChild(note);
163
164	torben	697	Element type = doc.createElement("type");
165			type.setTextContent( departure.getType() );
166			train.appendChild(type);
167
168	torben	307	root.appendChild(train);
169			}
170
171			doc.appendChild(root);
172
173
174			DOMSource domSource = new DOMSource(doc);
175
176			Transformer transformer = transformerFactory.newTransformer();
177			//transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
178			transformer.setOutputProperty(OutputKeys.METHOD, "xml");
179			transformer.setOutputProperty(OutputKeys.ENCODING,"ISO-8859-1");
180	torben	861	transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "1");
181	torben	307	transformer.setOutputProperty(OutputKeys.INDENT, "yes");
182			java.io.StringWriter sw = new java.io.StringWriter();
183			StreamResult sr = new StreamResult(sw);
184			transformer.transform(domSource, sr);
185			xml = sw.toString();
186
187
188			} catch (Exception e) {
189			throw new ServletException(e);
190			}
191			return xml;
192			}
193
194			}