traininfoservice/banedk/MetroFetcher.java

package dk.thoerup.traininfoservice.banedk;


import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

import net.sf.jsr107cache.Cache;
import net.sf.jsr107cache.CacheException;
import net.sf.jsr107cache.CacheManager;

import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

import com.google.appengine.api.memcache.jsr107cache.GCacheFactory;

import dk.thoerup.android.traininfo.common.MetroBean;
import dk.thoerup.android.traininfo.common.MetroBean.MetroEntry;
import dk.thoerup.android.traininfo.common.StationEntry;
import dk.thoerup.circuitbreaker.CircuitBreaker;
import dk.thoerup.circuitbreaker.CircuitBreakerManager;
import dk.thoerup.traininfoservice.StationDAO;
import dk.thoerup.traininfoservice.Statistics;


public class MetroFetcher {
        
        Logger logger = Logger.getLogger(MetroFetcher.class.getName());
        StationDAO stationDAO = new StationDAO();
        
        //Map<String, MetroBean> cache = new TimeoutMap<String,MetroBean>(60000); //TODO: make metro cache timeout configurable
        Cache cache;
        
        public MetroFetcher() {
                Map props = new HashMap();
                props.put(GCacheFactory.EXPIRATION_DELTA_MILLIS, 60000);        
                        
                try {
                        cache = CacheManager.getInstance().getCacheFactory().createCache(props);            
                } catch (CacheException e) {
                        logger.log(Level.WARNING, "error creating cache", e);
                }
        }
        
        public MetroBean cachedLookupMetroDepartures(int stationID) throws Exception {
                final String key = "metro:" + stationID;
                
                MetroBean metroBean = (MetroBean) cache.get(key);
                
                if (metroBean == null) {
                        metroBean = lookupMetroDepartures(stationID);
                        cache.put(key, metroBean);
                } else {
                        Statistics.getInstance().incrementDepartureCacheHits();
                        logger.info("Metro: Cache hit " + key); //remove before production
                }
                return metroBean;
        }

        public MetroBean lookupMetroDepartures(int stationID) throws Exception {
                
                StationEntry station = stationDAO.getById(stationID) ;
                        
                
                URL url = new URL("http://www.m.dk/layouts/Metro/Widgets/MetroWidget.ashx?StationId=" + station.getMetro() + "&Congestion=true&Application=MyMetro&Expiration=true");
                logger.fine("URL:" + url);
                
            JsoupInvocation wrapper = new JsoupInvocation( url, 3000);
            CircuitBreaker breaker = CircuitBreakerManager.getManager().getCircuitBreaker("metro");
                
                Document doc = (Document) breaker.invoke(wrapper);
                
                MetroBean bean = new MetroBean();
                
                bean.head = doc.getElementsByClass("metro-widget-headline").get(0).text();                      
                
                Element content = doc.getElementsByClass("metro-widget-content").get(0);
                Elements contentElems = content.children();
                                                        
                Element departureTable = content.getElementsByTag("table").get(0);

                Elements rows = departureTable.getElementsByTag("tr");

                for (int i=1; i<rows.size(); i++) {
                        Element row = rows.get(i);      
                        Elements fields = row.children();

                        
                        Elements metroFields = fields.get(0).children();                        
                        String metro ="";                       
                        for (Element elm : metroFields) {
                                metro = metro + elm.text() + " ";
                        }
                        
                        
                        String destination = fields.get(1).text();
                        
                        Elements minuteFields = fields.get(2).children();                       
                        String minutes ="";                     
                        for (Element elm : minuteFields) {
                                minutes = minutes + elm.text() + " ";
                        }
                        
                        MetroEntry entry = new MetroEntry();
                        entry.metro = metro.trim();
                        entry.destination = destination.trim();
                        entry.minutes = minutes.trim();
                        
                        bean.entries.add(entry);                        
                }
                                
                bean.operationInfo = contentElems.get(3).text();
                
                for (int i=4; i<contentElems.size(); i++) {
                        if (contentElems.get(i).text().trim().equalsIgnoreCase("køreplan")) {                          
                                bean.plan = contentElems.get(i+1).text();
                        }
                }

                return bean;
        }
        
}
1	package dk.thoerup.traininfoservice.banedk;
2
3
4	import java.net.URL;
5	import java.util.HashMap;
6	import java.util.Map;
7	import java.util.logging.Level;
8	import java.util.logging.Logger;
9
10	import net.sf.jsr107cache.Cache;
11	import net.sf.jsr107cache.CacheException;
12	import net.sf.jsr107cache.CacheManager;
13
14	import org.jsoup.nodes.Document;
15	import org.jsoup.nodes.Element;
16	import org.jsoup.select.Elements;
17
18	import com.google.appengine.api.memcache.jsr107cache.GCacheFactory;
19
20	import dk.thoerup.android.traininfo.common.MetroBean;
21	import dk.thoerup.android.traininfo.common.MetroBean.MetroEntry;
22	import dk.thoerup.android.traininfo.common.StationEntry;
23	import dk.thoerup.circuitbreaker.CircuitBreaker;
24	import dk.thoerup.circuitbreaker.CircuitBreakerManager;
25	import dk.thoerup.traininfoservice.StationDAO;
26	import dk.thoerup.traininfoservice.Statistics;
27
28
29
30	public class MetroFetcher {
31
32	Logger logger = Logger.getLogger(MetroFetcher.class.getName());
33	StationDAO stationDAO = new StationDAO();
34
35	//Map<String, MetroBean> cache = new TimeoutMap<String,MetroBean>(60000); //TODO: make metro cache timeout configurable
36	Cache cache;
37
38	public MetroFetcher() {
39	Map props = new HashMap();
40	props.put(GCacheFactory.EXPIRATION_DELTA_MILLIS, 60000);
41
42	try {
43	cache = CacheManager.getInstance().getCacheFactory().createCache(props);
44	} catch (CacheException e) {
45	logger.log(Level.WARNING, "error creating cache", e);
46	}
47	}
48
49	public MetroBean cachedLookupMetroDepartures(int stationID) throws Exception {
50	final String key = "metro:" + stationID;
51
52	MetroBean metroBean = (MetroBean) cache.get(key);
53
54	if (metroBean == null) {
55	metroBean = lookupMetroDepartures(stationID);
56	cache.put(key, metroBean);
57	} else {
58	Statistics.getInstance().incrementDepartureCacheHits();
59	logger.info("Metro: Cache hit " + key); //remove before production
60	}
61	return metroBean;
62	}
63
64	public MetroBean lookupMetroDepartures(int stationID) throws Exception {
65
66	StationEntry station = stationDAO.getById(stationID) ;
67
68
69	URL url = new URL("http://www.m.dk/layouts/Metro/Widgets/MetroWidget.ashx?StationId=" + station.getMetro() + "&Congestion=true&Application=MyMetro&Expiration=true");
70	logger.fine("URL:" + url);
71
72	JsoupInvocation wrapper = new JsoupInvocation( url, 3000);
73	CircuitBreaker breaker = CircuitBreakerManager.getManager().getCircuitBreaker("metro");
74
75	Document doc = (Document) breaker.invoke(wrapper);
76
77	MetroBean bean = new MetroBean();
78
79	bean.head = doc.getElementsByClass("metro-widget-headline").get(0).text();
80
81	Element content = doc.getElementsByClass("metro-widget-content").get(0);
82	Elements contentElems = content.children();
83
84	Element departureTable = content.getElementsByTag("table").get(0);
85
86	Elements rows = departureTable.getElementsByTag("tr");
87
88	for (int i=1; i<rows.size(); i++) {
89	Element row = rows.get(i);
90	Elements fields = row.children();
91
92
93
94	Elements metroFields = fields.get(0).children();
95	String metro ="";
96	for (Element elm : metroFields) {
97	metro = metro + elm.text() + " ";
98	}
99
100
101
102	String destination = fields.get(1).text();
103
104	Elements minuteFields = fields.get(2).children();
105	String minutes ="";
106	for (Element elm : minuteFields) {
107	minutes = minutes + elm.text() + " ";
108	}
109
110	MetroEntry entry = new MetroEntry();
111	entry.metro = metro.trim();
112	entry.destination = destination.trim();
113	entry.minutes = minutes.trim();
114
115	bean.entries.add(entry);
116	}
117
118	bean.operationInfo = contentElems.get(3).text();
119
120	for (int i=4; i<contentElems.size(); i++) {
121	if (contentElems.get(i).text().trim().equalsIgnoreCase("køreplan")) {
122	bean.plan = contentElems.get(i+1).text();
123	}
124	}
125
126	return bean;
127	}
128
129	}