public OnUnexpectedException ( |
||
unexpectedException | ||
Résultat | void |
GetHttpWebResponseStreamWithRetries ( String url, HttpStatusCode [] httpStatusCodesToFailImmediately, RequestStatistics requestStatistics, String userAgent, Int32 timeoutMs, ReportProgressHandler reportProgressHandler, CheckCancellationPendingHandler checkCancellationPendingHandler ) { Debug.Assert(!String.IsNullOrEmpty(url)); Debug.Assert(requestStatistics != null); Debug.Assert(!String.IsNullOrEmpty(userAgent)); Debug.Assert(timeoutMs > 0); Int32 iMaximumRetries = HttpRetryDelaysSec.Length; Int32 iRetriesSoFar = 0; while (true) { if (reportProgressHandler != null && iRetriesSoFar > 0) { reportProgressHandler("Retrying request."); } // Important Note: You cannot use the same HttpWebRequest object // for the retries. The object must be recreated each time. HttpWebRequest oHttpWebRequest = CreateHttpWebRequest( url, userAgent, timeoutMs); Stream oStream = null; try { if (checkCancellationPendingHandler != null) { checkCancellationPendingHandler(); } oStream = GetHttpWebResponseStreamNoRetries(oHttpWebRequest); if (reportProgressHandler != null && iRetriesSoFar > 0) { reportProgressHandler("Retry succeeded, continuing..."); } requestStatistics.OnSuccessfulRequest(); return(oStream); } catch (Exception oException) { #if WriteRequestsToDebug Debug.WriteLine("Exception: " + oException.Message); #endif if (oStream != null) { oStream.Close(); } // The IOException "Unable to read data from the transport" // connection: The connection was closed." can occur when // requesting data from Twitter, for example. if (!( oException is WebException || oException is IOException )) { throw oException; } if (iRetriesSoFar == iMaximumRetries) { requestStatistics.OnUnexpectedException(oException); throw (oException); } // If the status code is one of the ones specified in // httpStatusCodesToFailImmediately, rethrow the exception // without retrying the request. if (httpStatusCodesToFailImmediately != null && oException is WebException) { if (WebExceptionHasHttpStatusCode( (WebException)oException, httpStatusCodesToFailImmediately)) { throw (oException); } } Int32 iSeconds = HttpRetryDelaysSec[iRetriesSoFar]; if (reportProgressHandler != null) { reportProgressHandler(String.Format( "Request failed, pausing {0} {1} before retrying..." , iSeconds, StringUtil.MakePlural("second", iSeconds) )); } System.Threading.Thread.Sleep(1000 * iSeconds); iRetriesSoFar++; } } }
GetHttpWebResponseStreamWithRetries ( String url, HttpStatusCode [] httpStatusCodesToFailImmediately, RequestStatistics requestStatistics, String userAgent, Int32 timeoutMs, ReportProgressHandler reportProgressHandler, CheckCancellationPendingHandler checkCancellationPendingHandler ) { Debug.Assert( !String.IsNullOrEmpty(url) ); Debug.Assert(requestStatistics != null); Debug.Assert( !String.IsNullOrEmpty(userAgent) ); Debug.Assert(timeoutMs > 0); Int32 iMaximumRetries = HttpRetryDelaysSec.Length; Int32 iRetriesSoFar = 0; while (true) { if (reportProgressHandler != null && iRetriesSoFar > 0) { reportProgressHandler("Retrying request."); } // Important Note: You cannot use the same HttpWebRequest object // for the retries. The object must be recreated each time. HttpWebRequest oHttpWebRequest = CreateHttpWebRequest( url, userAgent, timeoutMs); Stream oStream = null; try { if (checkCancellationPendingHandler != null) { checkCancellationPendingHandler(); } oStream = GetHttpWebResponseStreamNoRetries(oHttpWebRequest); if (reportProgressHandler != null && iRetriesSoFar > 0) { reportProgressHandler("Retry succeeded, continuing..."); } requestStatistics.OnSuccessfulRequest(); return (oStream); } catch (Exception oException) { #if WriteRequestsToDebug Debug.WriteLine("Exception: " + oException.Message); #endif if (oStream != null) { oStream.Close(); } // The IOException "Unable to read data from the transport" // connection: The connection was closed." can occur when // requesting data from Twitter, for example. if ( !( oException is WebException || oException is IOException ) ) { throw oException; } if (iRetriesSoFar == iMaximumRetries) { requestStatistics.OnUnexpectedException(oException); throw (oException); } // If the status code is one of the ones specified in // httpStatusCodesToFailImmediately, rethrow the exception // without retrying the request. if (httpStatusCodesToFailImmediately != null && oException is WebException) { if ( WebExceptionHasHttpStatusCode( (WebException)oException, httpStatusCodesToFailImmediately) ) { throw (oException); } } Int32 iSeconds = HttpRetryDelaysSec[iRetriesSoFar]; if (reportProgressHandler != null) { reportProgressHandler( String.Format( "Request failed, pausing {0} {1} before retrying..." , iSeconds, StringUtil.MakePlural("second", iSeconds) ) ); } System.Threading.Thread.Sleep(1000 * iSeconds); iRetriesSoFar++; } } }