External function calls

1using System.IO;

2using System.Net;

3using System.Xml;

4using AcumenBusiness.IModel;

5usingType=AcumenBusiness.IModel.Type;

6

7namespace TestCallWebService

8 {

9 [Concept("Weather info", "Try to get weather forecast from different services")]

10publicclassWeatherInfoProvider

11 {

12privatestaticreadonlystring YahooWeatherURLFormat = "http://weather.yahooapis.com/forecastrss?p={0}";

13

14 [Term("workaround", "import function requires one field. (bug)")]

15privatestring dummyField;

16publicstring DummyField

17 {

18get { return dummyField; }

19set { dummyField = value; }

20 }

21

22 [Function("Get temperature", "Get the weather info from Yahoo",

23 ReturnType = Type.text,

24 ArgumentTypes = newType[] { Type.integer })]

25publicstaticstring GetWeatherInfoAsFeed(int zipCode)

26 {

27HttpWebRequest request = (HttpWebRequest) WebRequest.Create(string.Format(YahooWeatherURLFormat, zipCode));

28// execute the request

29HttpWebResponse response = (HttpWebResponse) request.GetResponse();

30

31// we will read data via the response stream

32Stream resStream = response.GetResponseStream();

33XmlDocument rssFeed = newXmlDocument();

34 rssFeed.Load(resStream);

35

36//set an XmlNamespaceManager since we have to make explicit namespace searches

37XmlNamespaceManager xmlnsManager = new System.Xml.XmlNamespaceManager(rssFeed.NameTable);

38//Add the namespaces used in the xml doc to the XmlNamespaceManager.

39 xmlnsManager.AddNamespace("yweather", "http://xml.weather.yahoo.com/ns/rss/1.0");

40

41XmlNode weatherCondition = rssFeed.SelectSingleNode("/rss/channel/item/yweather:condition/@temp", xmlnsManager);

42if (weatherCondition != null) {

43return weatherCondition.Value;

44 }

45returnnull;

46 }

47 }

48 }