public sealed override void Start(StreamingAPIParameters p = null)
{
try {
this.request = CreateWebRequest(p);
StartThread();
} catch (WebException wex) {
throw new ApplicationException("Could not start: " + wex.Message, wex);
}
}
protected override HttpWebRequest CreateWebRequest(StreamingAPIParameters p)
{
string url = ConstructUrlWithQueryString(StreamRequestUrl, p);
var request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "GET";
var header = CreateAuthHeader(request);
request.Headers.Add("Authorization", header.GetHeaderString());
return(request);
}
protected static string ConstructUrlWithQueryString(string url, StreamingAPIParameters p)
{
// This technique create a specialized version of NameValueCollection.
// Calling its ToString() method yields a correctly encoded querystring.
var nv = HttpUtility.ParseQueryString(string.Empty);
if (p != null)
{
if (p.Count != 0)
{
nv.Add("count", p.Count.ToString());
}
if (p.Delimited != 0)
{
nv.Add("delimited", p.Delimited.ToString());
}
}
return(url + (nv.Count == 0 ? string.Empty : "?" + nv.ToString()));
}
protected static NameValueCollection ConstructPostData(StreamingAPIParameters p)
{
var postData = new NameValueCollection();
if (p != null)
{
if (p.Count != 0)
{
postData.Add("count", p.Count.ToString());
}
if (p.Delimited != 0)
{
postData.Add("delimited", p.Delimited.ToString());
}
if (p.Follow.Length != 0)
{
postData.Add("follow", string.Join(",",
p.Follow.Select(x => x.ToString()).ToArray()));
}
if (p.Locations.Length != 0)
{
postData.Add("locations", string.Join(",",
p.Locations.Select(x => x.ToString()).ToArray()));
}
if (p.Track.Length != 0)
{
postData.Add("track", string.Join(",", p.Track));
}
}
return(postData);
}
protected override HttpWebRequest CreateWebRequest(StreamingAPIParameters p)
{
PostData.Add(ConstructPostData(p));
var request = (HttpWebRequest)WebRequest.Create(StreamRequestUrl);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
var header = CreateAuthHeader(request);
request.Headers.Add("Authorization", header.GetHeaderString());
using (var sw = new StreamWriter(request.GetRequestStream()))
{
string encoded = HttpUtil.EncodeFormPostData(PostData);
if (!string.IsNullOrEmpty(encoded))
{
sw.Write(encoded);
}
}
return(request);
}
/// <summary> /// This starts the internal thread that pulls tweets from Twitter via Streaming API. /// The tweets are put into internal queue. User has to call Dispatch() in order to fire /// EventReceived event that let him/her process tweets. /// </summary> /// <param name="p"></param> public abstract void Start(StreamingAPIParameters p = null);
protected abstract HttpWebRequest CreateWebRequest(StreamingAPIParameters p);
