/// <summary>
/// Occurs when any of the following network conditions occur:
/// 1. Unable to connect to target host for any reason
/// 2. Write request fails
/// 3. Read request fails
/// </summary>
/// <param name="response">The <see cref="Response"/> that contains information about the failure</param>
/// <param name="state">An optional state object that will be passed into the response events associated with this request</param>
protected override void OnCommunicationFailure(Response response, object state)
{
SubscriptionResponse sr = SubscriptionResponse.FromResponse(response, null);
ResetTimerBasedOnResponse(sr);
this.OnErrorResponse(sr);
}
/// <summary>
/// Called when an 'ERROR' response occurs.
/// </summary>
/// <param name="response">The <see cref="Response"/></param>
protected void OnErrorResponse(SubscriptionResponse response)
{
if (this.ErrorResponse != null)
{
this.ErrorResponse(response);
}
}
/// <summary>
/// Parses the response and raises the appropriate event
/// </summary>
/// <param name="responseText">The raw GNTP response</param>
/// <param name="state">An optional state object that will be passed into the response events associated with this request</param>
protected override void OnResponseReceived(string responseText, object state)
{
CallbackData cd;
HeaderCollection headers;
MessageParser mp = new MessageParser();
Response response = mp.Parse(responseText, out cd, out headers);
SubscriptionResponse sr = SubscriptionResponse.FromResponse(response, headers);
ResetTimerBasedOnResponse(sr);
if (sr.IsOK)
{
this.OnOKResponse(sr);
}
else
{
this.OnErrorResponse(sr);
}
}
/// <summary>
/// Creates a new <see cref="SubscriptionResponse"/> from a base <see cref="Response"/> and a list of headers
/// </summary>
/// <param name="response">The base <see cref="Response"/></param>
/// <param name="headers">The <see cref="HeaderCollection"/> used to populate the response</param>
/// <returns><see cref="SubscriptionResponse"/></returns>
internal static SubscriptionResponse FromResponse(Response response, HeaderCollection headers)
{
SubscriptionResponse sr = null;
if (response.IsOK)
{
int ttl = headers.GetHeaderIntValue(Header.SUBSCRIPTION_TTL, true);
sr = new SubscriptionResponse(ttl);
}
else
{
sr = new SubscriptionResponse(response.ErrorCode, response.ErrorDescription);
sr.ttl = 0;
}
SetInhertiedAttributesFromHeaders(sr, headers);
return(sr);
}
private void ResetTimerBasedOnResponse(SubscriptionResponse sr)
{
// try to renew 30 seconds before the server disconnects us, or at the retry interval if this failed
this.ttl = (sr.IsOK ? Math.Max((sr.TTL - 30), 0) : RETRY_INTERVAL);
if (this.ttl > 0)
{
StartRenewalTimer();
}
else
{
StopRenewalTimer();
}
}
/// <summary>
/// Creates a new <see cref="SubscriptionResponse"/> from a base <see cref="Response"/> and a list of headers
/// </summary>
/// <param name="response">The base <see cref="Response"/></param>
/// <param name="headers">The <see cref="HeaderCollection"/> used to populate the response</param>
/// <returns><see cref="SubscriptionResponse"/></returns>
internal static SubscriptionResponse FromResponse(Response response, HeaderCollection headers)
{
SubscriptionResponse sr = null;
if (response.IsOK)
{
int ttl = headers.GetHeaderIntValue(Header.SUBSCRIPTION_TTL, true);
sr = new SubscriptionResponse(ttl);
}
else
{
sr = new SubscriptionResponse(response.ErrorCode, response.ErrorDescription);
sr.ttl = 0;
}
SetInhertiedAttributesFromHeaders(sr, headers);
return sr;
}
/// <summary>
/// Called when an 'ERROR' response occurs.
/// </summary>
/// <param name="response">The <see cref="Response"/></param>
protected void OnErrorResponse(SubscriptionResponse response)
{
if (this.ErrorResponse != null)
{
this.ErrorResponse(response);
}
}
private void ResetTimerBasedOnResponse(SubscriptionResponse sr)
{
// try to renew 30 seconds before the server disconnects us, or at the retry interval if this failed
this.ttl = (sr.IsOK ? Math.Max((sr.TTL - 30), 0) : RETRY_INTERVAL);
if (this.ttl > 0)
StartRenewalTimer();
else
StopRenewalTimer();
}
