traininfoservice/banedk/TimetableServlet.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 org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;

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

/**
 * Servlet implementation class TimetableServlet
 */
@WebServlet(urlPatterns={"/TimetableServlet"})
public class TimetableServlet extends HttpServlet {
        private static final long serialVersionUID = 1L;
       
        
        Logger logger = Logger.getLogger( TimetableServlet.class.getName() );
        
        TimetableFetcher fetcher;
        
        
        @Override
        public void init() throws ServletException {
                super.init();
                

                TraininfoSettings settings = (TraininfoSettings) getServletContext().getAttribute("settings");
                fetcher = new TimetableFetcher(settings);
        }
        
        @Override
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                if (request.getParameter("train") == null || request.getParameter("train").equals("") ) {
                        response.sendError(400, "not enough parameters (train)");
                        return;
                }
                if (request.getParameter("type") == null || request.getParameter("type").equals("") ) {
                        response.sendError(400, "not enough parameters (type)");
                        return;
                }
                Statistics.getInstance().incrementTimetableLookups();
                
                String train = request.getParameter("train").trim();
                String type = request.getParameter("type").trim();
                        
                
                TimetableBean timetable = null;
                try
                {
                        timetable = fetcher.cachedLookupTimetable(train, type);
                
                } catch (java.io.IOException ioe) {
                        logger.warning("(timetable) Read failed, type=" + type + ", train="+train + ". " + ioe.getMessage());
                        Statistics.getInstance().incrementTimetableErrors();
                        //timetable = generateErrorBean(1);
                        response.sendError( 500, "Backend didn't answer" );
                } catch (CircuitBreakerException cbe) {
                        logger.warning("Circuitbreaker - failing fast, type=" + type + ", train="+train);
                        Statistics.getInstance().incrementTimetableErrors();                    
                        timetable = generateErrorBean(1);
                }catch (Exception e) {
                        logger.log(Level.WARNING, "failure looking up timetable: type=" + type + ",train=" +train, e);
                        Statistics.getInstance().incrementTimetableErrors();
                        response.sendError(500);
                }
                
                if (timetable != null) {
                        String responseXML = formatTimetable(timetable);
                
                        response.setContentType("text/xml");
                        response.getWriter().print(responseXML);
                }
                
        }
        
        protected TimetableBean generateErrorBean(int code) {
                TimetableBean bean = new TimetableBean();               
                bean.errorCode = code;
                return bean;
        }
        
        String formatTimetable(TimetableBean timetable) throws ServletException {
                Serializer serializer = new Persister();

                StringWriter out = new StringWriter();

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

}
1	package dk.thoerup.traininfoservice.banedk;
2
3	import java.io.IOException;
4	import java.io.StringWriter;
5
6	import java.util.logging.Level;
7	import java.util.logging.Logger;
8
9	import javax.servlet.ServletException;
10	import javax.servlet.annotation.WebServlet;
11	import javax.servlet.http.HttpServlet;
12	import javax.servlet.http.HttpServletRequest;
13	import javax.servlet.http.HttpServletResponse;
14
15	import org.simpleframework.xml.Serializer;
16	import org.simpleframework.xml.core.Persister;
17
18	import dk.thoerup.android.traininfo.common.DepartureBean;
19	import dk.thoerup.android.traininfo.common.TimetableBean;
20	import dk.thoerup.circuitbreaker.CircuitBreakerException;
21	import dk.thoerup.traininfoservice.Statistics;
22	import dk.thoerup.traininfoservice.TraininfoSettings;;
23
24	/**
25	* Servlet implementation class TimetableServlet
26	*/
27	@WebServlet(urlPatterns={"/TimetableServlet"})
28	public class TimetableServlet extends HttpServlet {
29	private static final long serialVersionUID = 1L;
30
31
32	Logger logger = Logger.getLogger( TimetableServlet.class.getName() );
33
34	TimetableFetcher fetcher;
35
36
37	@Override
38	public void init() throws ServletException {
39	super.init();
40
41
42	TraininfoSettings settings = (TraininfoSettings) getServletContext().getAttribute("settings");
43	fetcher = new TimetableFetcher(settings);
44	}
45
46	@Override
47	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
48	if (request.getParameter("train") == null \|\| request.getParameter("train").equals("") ) {
49	response.sendError(400, "not enough parameters (train)");
50	return;
51	}
52	if (request.getParameter("type") == null \|\| request.getParameter("type").equals("") ) {
53	response.sendError(400, "not enough parameters (type)");
54	return;
55	}
56	Statistics.getInstance().incrementTimetableLookups();
57
58	String train = request.getParameter("train").trim();
59	String type = request.getParameter("type").trim();
60
61
62	TimetableBean timetable = null;
63	try
64	{
65	timetable = fetcher.cachedLookupTimetable(train, type);
66
67	} catch (java.io.IOException ioe) {
68	logger.warning("(timetable) Read failed, type=" + type + ", train="+train + ". " + ioe.getMessage());
69	Statistics.getInstance().incrementTimetableErrors();
70	//timetable = generateErrorBean(1);
71	response.sendError( 500, "Backend didn't answer" );
72	} catch (CircuitBreakerException cbe) {
73	logger.warning("Circuitbreaker - failing fast, type=" + type + ", train="+train);
74	Statistics.getInstance().incrementTimetableErrors();
75	timetable = generateErrorBean(1);
76	}catch (Exception e) {
77	logger.log(Level.WARNING, "failure looking up timetable: type=" + type + ",train=" +train, e);
78	Statistics.getInstance().incrementTimetableErrors();
79	response.sendError(500);
80	}
81
82	if (timetable != null) {
83	String responseXML = formatTimetable(timetable);
84
85	response.setContentType("text/xml");
86	response.getWriter().print(responseXML);
87	}
88
89	}
90
91	protected TimetableBean generateErrorBean(int code) {
92	TimetableBean bean = new TimetableBean();
93	bean.errorCode = code;
94	return bean;
95	}
96
97	String formatTimetable(TimetableBean timetable) throws ServletException {
98	Serializer serializer = new Persister();
99
100	StringWriter out = new StringWriter();
101
102	try {
103	serializer.write(timetable, out);
104	} catch (Exception e) {
105	throw new ServletException(e);
106	}
107
108	return out.toString();
109	}
110
111	}