traininfoservice/banedk/DepartureServlet.java

package dk.thoerup.traininfoservice.banedk;

import java.io.IOException;
import java.util.List;
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.StationDAO;
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 useTempSite =  Boolean.parseBoolean( getServletContext().getInitParameter("usetempsite") );
                int cacheTimeout =  Integer.parseInt( getServletContext().getInitParameter("cache_timeout") );
                logger.info( "DepartureServlet, use temp site=" + useTempSite + ", cache=" + cacheTimeout);
                fetcher = new DepartureFetcher(useTempSite, cacheTimeout);
        }

        @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");

                List<DepartureBean> beans;

                String stationName = StationDAO.getStationName(station);

                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, stationName) );
                } else if (format.equalsIgnoreCase("html")) {
                        
                        String advStr = req.getParameter("advanced");
                        boolean advanced = advStr != null ? Boolean.parseBoolean(advStr) : false;
                        
                        req.setAttribute("advanced", advanced);
                        req.setAttribute("stationname", stationName );
                        req.setAttribute("departurebeans", beans);
                        req.setAttribute("stationID", station );
                        getServletContext().getRequestDispatcher("/ViewDepartures.jsp").forward(req,resp);
                } else {
                        resp.sendError(400, "Unknown format");                  
                }

        }

        protected String formatXml(List<DepartureBean> beans, String stationName) 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", stationName);
                for (DepartureBean departure : beans) {
                        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			import java.util.List;
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.DocumentBuilder;
14			import javax.xml.parsers.DocumentBuilderFactory;
15			import javax.xml.transform.OutputKeys;
16			import javax.xml.transform.Transformer;
17			import javax.xml.transform.TransformerFactory;
18			import javax.xml.transform.dom.DOMSource;
19			import javax.xml.transform.stream.StreamResult;
20
21			import org.w3c.dom.DOMImplementation;
22			import org.w3c.dom.Document;
23			import org.w3c.dom.Element;
24
25	torben	468	import dk.thoerup.circuitbreaker.CircuitBreakerException;
26	torben	650	import dk.thoerup.traininfoservice.StationDAO;
27	torben	711	import dk.thoerup.traininfoservice.Statistics;
28	torben	307
29			/**
30			* Servlet implementation class DepartureServlet
31			*/
32	torben	958	@WebServlet(urlPatterns={"/DepartureServlet"})
33	torben	307	public class DepartureServlet extends HttpServlet {
34			private static final long serialVersionUID = 1L;
35	torben	348
36			Logger logger = Logger.getLogger( DepartureServlet.class.getName() );
37	torben	307
38	torben	580	DepartureFetcher fetcher;
39	torben	307	TransformerFactory transformerFactory = TransformerFactory.newInstance();
40			DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
41
42
43	torben	425	@Override
44	torben	580	public void init() throws ServletException {
45			super.init();
46	torben	584
47			boolean useTempSite = Boolean.parseBoolean( getServletContext().getInitParameter("usetempsite") );
48			int cacheTimeout = Integer.parseInt( getServletContext().getInitParameter("cache_timeout") );
49			logger.info( "DepartureServlet, use temp site=" + useTempSite + ", cache=" + cacheTimeout);
50			fetcher = new DepartureFetcher(useTempSite, cacheTimeout);
51	torben	580	}
52
53			@Override
54	torben	711	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
55	torben	458	if (req.getParameter("station") == null) {
56			resp.sendError(400, "not enough parameters");
57			return;
58			}
59	torben	829
60			boolean arrival = false;
61			try {
62			arrival = Integer.parseInt( req.getParameter("arrival")) != 0;
63			} catch (Exception e) {}
64
65	torben	711	Statistics.getInstance().incrementDepartureLookups();
66	torben	458
67	torben	307	int station = Integer.parseInt( req.getParameter("station") );
68			String format = req.getParameter("format");
69
70			List<DepartureBean> beans;
71
72	torben	650	String stationName = StationDAO.getStationName(station);
73	torben	307
74			try {
75	torben	829	beans = fetcher.cachedLookupDepartures(station, arrival);
76	torben	462	} catch (java.io.IOException ioe) {
77			logger.warning("Read failed, station="+station + ". " + ioe.getMessage() );
78	torben	716	Statistics.getInstance().incrementDepartureErrors();
79	torben	348	resp.sendError(500);
80			return;
81	torben	421	} catch (CircuitBreakerException cbe) {
82			logger.warning("Circuitbreaker - failing fast");
83	torben	716	Statistics.getInstance().incrementDepartureErrors();
84	torben	421	resp.sendError(500);
85			return;
86	torben	451	} catch (Exception e) {
87	torben	348	logger.log(Level.WARNING, "Unknown exception, station=" +station, e);
88	torben	716	Statistics.getInstance().incrementDepartureErrors();
89	torben	348	resp.sendError(500);
90			return;
91	torben	307	}
92
93			resp.setDateHeader("Expires", 0);
94			resp.setHeader("Cache-Control", "no-cache, must-revalidate");
95
96			if (format.equalsIgnoreCase("xml")) {
97			resp.setContentType("text/xml");
98			resp.getWriter().print( formatXml(beans, stationName) );
99			} else if (format.equalsIgnoreCase("html")) {
100	torben	585
101			String advStr = req.getParameter("advanced");
102			boolean advanced = advStr != null ? Boolean.parseBoolean(advStr) : false;
103
104			req.setAttribute("advanced", advanced);
105	torben	307	req.setAttribute("stationname", stationName );
106			req.setAttribute("departurebeans", beans);
107			req.setAttribute("stationID", station );
108			getServletContext().getRequestDispatcher("/ViewDepartures.jsp").forward(req,resp);
109			} else {
110	torben	862	resp.sendError(400, "Unknown format");
111	torben	307	}
112
113			}
114
115			protected String formatXml(List<DepartureBean> beans, String stationName) throws ServletException{
116			String xml = "";
117			try {
118			DocumentBuilder builder = docBuilderFactory.newDocumentBuilder();
119			DOMImplementation impl = builder.getDOMImplementation();
120
121
122			Document doc = impl.createDocument(null,null,null);
123			Element root = doc.createElement("departureinfo");
124			root.setAttribute("station", stationName);
125			for (DepartureBean departure : beans) {
126			Element train = doc.createElement("train");
127
128			Element time = doc.createElement("time");
129			time.setTextContent( departure.getTime() );
130			train.appendChild(time);
131
132			Element updated = doc.createElement("updated");
133			updated.setTextContent( String.valueOf(departure.getUpdated()) );
134			train.appendChild(updated);
135
136			Element trainNumber = doc.createElement("trainnumber");
137			trainNumber.setTextContent( departure.getTrainNumber() );
138			train.appendChild(trainNumber);
139
140			Element destination = doc.createElement("destination");
141			destination.setTextContent( departure.getDestination());
142			train.appendChild(destination);
143
144			Element origin = doc.createElement("origin");
145			origin.setTextContent( departure.getOrigin() );
146			train.appendChild(origin);
147
148			Element location= doc.createElement("location");
149			location.setTextContent( departure.getLocation() );
150			train.appendChild(location);
151
152			Element status = doc.createElement("status");
153			status.setTextContent( departure.getStatus() );
154			train.appendChild(status);
155
156			Element note = doc.createElement("note");
157			note.setTextContent( departure.getNote() );
158			train.appendChild(note);
159
160	torben	697	Element type = doc.createElement("type");
161			type.setTextContent( departure.getType() );
162			train.appendChild(type);
163
164	torben	307	root.appendChild(train);
165			}
166
167			doc.appendChild(root);
168
169
170			DOMSource domSource = new DOMSource(doc);
171
172			Transformer transformer = transformerFactory.newTransformer();
173			//transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
174			transformer.setOutputProperty(OutputKeys.METHOD, "xml");
175			transformer.setOutputProperty(OutputKeys.ENCODING,"ISO-8859-1");
176	torben	861	transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "1");
177	torben	307	transformer.setOutputProperty(OutputKeys.INDENT, "yes");
178			java.io.StringWriter sw = new java.io.StringWriter();
179			StreamResult sr = new StreamResult(sw);
180			transformer.transform(domSource, sr);
181			xml = sw.toString();
182
183
184			} catch (Exception e) {
185			throw new ServletException(e);
186			}
187			return xml;
188			}
189
190			}