/// <summary>
/// Initializes a new instance of the <see cref="RemoteFileSubscriptionStreamReader"/> class.
/// </summary>
/// <param name="dataCacheProvider">The <see cref="IDataCacheProvider"/> used to retrieve a stream of data</param>
/// <param name="source">The remote url to be downloaded via web client</param>
/// <param name="downloadDirectory">The local directory and destination of the download</param>
/// <param name="headers">Defines header values to add to the request</param>
public RemoteFileSubscriptionStreamReader(IDataCacheProvider dataCacheProvider, string source, string downloadDirectory, IEnumerable <KeyValuePair <string, string> > headers)
{
// don't use cache if data is ephemeral
// will be false for live history requests and live subscriptions
var useCache = !dataCacheProvider.IsDataEphemeral;
// create a hash for a new filename
var filename = (useCache ? source.ToMD5() : Guid.NewGuid().ToString()) + source.GetExtension();
var destination = Path.Combine(downloadDirectory, filename);
string contents = null;
if (useCache)
{
lock (_fileSystemLock)
{
if (!File.Exists(destination))
{
contents = _downloader.Download(source, headers, null, null);
File.WriteAllText(destination, contents);
}
}
}
else
{
contents = _downloader.Download(source, headers, null, null);
File.WriteAllText(destination, contents);
}
if (contents != null)
{
// Send the file to the dataCacheProvider so it is available when the streamReader asks for it
dataCacheProvider.Store(destination, System.Text.Encoding.UTF8.GetBytes(contents));
}
// now we can just use the local file reader
_streamReader = new LocalFileSubscriptionStreamReader(dataCacheProvider, destination);
}
/// <summary>
/// Initializes a new instance of the <see cref="RemoteFileSubscriptionStreamReader"/> class.
/// </summary>
/// <param name="dataCacheProvider">The <see cref="IDataCacheProvider"/> used to retrieve a stream of data</param>
/// <param name="source">The remote url to be downloaded via web client</param>
/// <param name="downloadDirectory">The local directory and destination of the download</param>
/// <param name="headers">Defines header values to add to the request</param>
public RemoteFileSubscriptionStreamReader(IDataCacheProvider dataCacheProvider, string source, string downloadDirectory, IEnumerable <KeyValuePair <string, string> > headers)
{
// create a hash for a new filename
var filename = Guid.NewGuid() + source.GetExtension();
var destination = Path.Combine(downloadDirectory, filename);
var contents = _downloader.Download(source, headers, null, null);
File.WriteAllText(destination, contents);
// Send the file to the dataCacheProvider so it is available when the streamReader asks for it
dataCacheProvider.Store(destination, System.Text.Encoding.UTF8.GetBytes(contents));
// now we can just use the local file reader
_streamReader = new LocalFileSubscriptionStreamReader(dataCacheProvider, destination);
}
