public async Task Run()
{
stop = new ManualResetEvent(false);
if (!string.IsNullOrEmpty(Url))
{
var client = new HttpClient();
client.Timeout = TimeSpan.FromMilliseconds(Timeout);
client.DefaultRequestHeaders.Add("Accept", "application/xml");
try
{
// Raise Started Event
Started?.Invoke();
var stream = await client.GetStreamAsync(Url);
using (var reader = new StreamReader(stream))
{
string prevLine = null;
while (!stop.WaitOne(0, true) && !reader.EndOfStream)
{
var line = reader.ReadLine();
if (!string.IsNullOrEmpty(line))
{
if (IsXml(line) && IsXml(prevLine))
{
var xml = $"{prevLine}{line}";
XmlReceived?.Invoke(xml);
}
prevLine = line;
}
}
}
}
catch (HttpRequestException e)
{
ConnectionError?.Invoke(e);
}
}
Stopped?.Invoke();
}
private void Worker()
{
try
{
var request = (HttpWebRequest)WebRequest.Create(Url);
using (var response = (HttpWebResponse)request.GetResponse())
using (var stream = response.GetResponseStream())
using (var reader = new StreamReader(stream, Encoding.GetEncoding("utf-8")))
{
// Set Read Buffer
var buffer = new char[1048576]; // 1 MB
int i = reader.Read(buffer, 0, buffer.Length);
string xml = "";
while (i > 0 && !stop.WaitOne(0, true))
{
// Get string from buffer
var s = new string(buffer, 0, i);
// Find Beginning of XML (exclude HTTP header)
int b = s.IndexOf("<?xml ");
if (b >= 0)
{
s = s.Substring(b);
}
// Add buffer to XML
xml += s;
// Find Closing Tag
int c = FindClosingTag(xml);
// Test if End of XML
if (c >= 0)
{
b = xml.LastIndexOf("<?xml ");
if (c > b)
{
// Raise XML Received Event and pass XML
XmlReceived?.Invoke(xml.Substring(b, c - b));
// Remove MTConnect document from xml
xml = xml.Remove(b, c - b).Trim();
}
if (!string.IsNullOrEmpty(xml))
{
// Raise XML Error and break from while
XmlError?.Invoke(xml);
break;
}
// Reset XML
xml = "";
}
// Clear Buffer
Array.Clear(buffer, 0, buffer.Length);
// Read Next Chunk
i = reader.Read(buffer, 0, buffer.Length);
}
}
}
catch (Exception ex)
{
ConnectionError?.Invoke(ex);
}
}
public async Task Run()
{
stop = new CancellationTokenSource();
if (!string.IsNullOrEmpty(Url))
{
var client = new HttpClient();
client.Timeout = TimeSpan.FromMilliseconds(Timeout);
client.DefaultRequestHeaders.Add("Accept", "application/xml");
try
{
// Raise Started Event
Started?.Invoke();
var stream = await client.GetStreamAsync(Url);
using (var reader = new StreamReader(stream))
{
string prevLine = null;
string doc = null;
var xmlFound = false;
while (!stop.IsCancellationRequested && !reader.EndOfStream)
{
var line = reader.ReadLine();
if (!string.IsNullOrEmpty(line))
{
// Test if Previous Line was beginning of XML Document
if (IsXml(prevLine))
{
xmlFound = true;
doc = prevLine;
}
// Test if Current Line is a HTML Header
if (IsHeader(line))
{
xmlFound = false;
}
// Build XML Document
if (xmlFound)
{
doc += line;
}
// Test if End of XML Document
if (IsEnd(line) && !string.IsNullOrEmpty(doc))
{
XmlReceived?.Invoke(doc);
doc = null;
}
prevLine = line;
}
}
}
}
catch (HttpRequestException e)
{
ConnectionError?.Invoke(e);
}
}
Stopped?.Invoke();
}