/// <summary>
/// Initializes a new instance of the <see cref="NetWatcher"/> class.
/// </summary>
/// <param name="requestUri">The request URI to monitor for changes.</param>
/// <param name="period">The time interval between periodic signaling for changes of provided <paramref name="requestUri"/>.</param>
/// <param name="dueTime">The amount of time to delay before the associated <see cref="Watcher"/> starts signaling. Specify negative one (-1) milliseconds to prevent the signaling from starting. Specify zero (0) to start the signaling immediately.</param>
/// <param name="checkResponseData">if set to <c>true</c>, a MD5 hash check of the response data is used to determine a change state of the resource; <c>false</c> to check only for the last modification of the resource.</param>
/// <remarks>Monitors the provided <paramref name="requestUri"/> for changes in an interval specified by <paramref name="period"/>, determined by <paramref name="checkResponseData"/>.</remarks>
public NetWatcher(Uri requestUri, TimeSpan dueTime, TimeSpan period, bool checkResponseData) : base(dueTime, period)
{
if (requestUri == null)
{
throw new ArgumentNullException(nameof(requestUri));
}
UriScheme scheme = UriSchemeConverter.FromString(requestUri.Scheme);
switch (scheme)
{
case UriScheme.File:
case UriScheme.Ftp:
case UriScheme.Http:
case UriScheme.Https:
break;
default:
throw new ArgumentException("The provided Uri does not have a valid scheme attached. Allowed schemes for now is File, FTP, HTTP or HTTPS.", nameof(requestUri));
}
RequestUri = requestUri;
Scheme = scheme;
UtcCreated = DateTime.UtcNow;
CheckResponseData = checkResponseData;
Signature = SignatureDefault;
}
/// <summary>
/// Starts and performs the necessary dependency tasks of this instance.
/// </summary>
/// <exception cref="System.ArgumentException">The provided Uri does not have a valid scheme attached. Allowed schemes for now is File, FTP or HTTP.;uris</exception>
public override void Start()
{
List <NetWatcher> watchers = new List <NetWatcher>();
foreach (Uri uri in Uris)
{
switch (UriSchemeConverter.FromString(uri.Scheme))
{
case UriScheme.File:
case UriScheme.Http:
case UriScheme.Https:
NetWatcher watcher;
NetWatcher tempWatcher = null;
try
{
tempWatcher = new NetWatcher(uri, DueTime, Period, CheckResponseData);
tempWatcher.Changed += WatcherChanged;
watcher = tempWatcher;
tempWatcher = null;
}
finally
{
if (tempWatcher != null)
{
tempWatcher.Dispose();
}
}
watchers.Add(watcher);
break;
default:
throw new InvalidOperationException("The provided Uri does not have a valid scheme attached. Allowed schemes for now is File, HTTP or HTTPS.");
}
}
Watchers = watchers.ToArray();
UtcCreated = DateTime.UtcNow;
SetUtcLastModified(UtcCreated);
}