internal void BatchBeginRequest()
{
PerRequest pereq = null;
try
{
ODataRequestMessageWrapper batchRequestMessage = this.GenerateBatchRequest();
this.Abortable = batchRequestMessage;
if (batchRequestMessage != null)
{
batchRequestMessage.SetContentLengthHeader();
this.perRequest = pereq = new PerRequest();
pereq.Request = batchRequestMessage;
pereq.RequestContentStream = batchRequestMessage.CachedRequestStream;
AsyncStateBag asyncStateBag = new AsyncStateBag(pereq);
this.responseStream = new MemoryStream();
IAsyncResult asyncResult = BaseAsyncResult.InvokeAsync(batchRequestMessage.BeginGetRequestStream, this.AsyncEndGetRequestStream, asyncStateBag);
pereq.SetRequestCompletedSynchronously(asyncResult.CompletedSynchronously);
}
else
{
Debug.Assert(this.CompletedSynchronously, "completedSynchronously");
Debug.Assert(this.IsCompletedInternally, "completed");
}
}
catch (Exception e)
{
this.HandleFailure(pereq, e);
throw; // to user on BeginSaveChangeSet, will still invoke Callback
}
finally
{
this.HandleCompleted(pereq); // will invoke user callback
}
Debug.Assert((this.CompletedSynchronously && this.IsCompleted) || !this.CompletedSynchronously, "sync without complete");
}
private void AsyncEndRead(IAsyncResult asyncResult)
#endif
{
#if PORTABLELIB
IAsyncResult asyncResult = (IAsyncResult)task;
#endif
Debug.Assert(asyncResult != null && asyncResult.IsCompleted, "asyncResult.IsCompleted");
#if PORTABLELIB
AsyncStateBag asyncStateBag = asyncState as AsyncStateBag;
#else
AsyncStateBag asyncStateBag = asyncResult.AsyncState as AsyncStateBag;
#endif
PerRequest pereq = asyncStateBag == null ? null : asyncStateBag.PerRequest;
int count = 0;
try
{
this.CompleteCheck(pereq, InternalError.InvalidEndReadCompleted);
pereq.SetRequestCompletedSynchronously(asyncResult.CompletedSynchronously); // BeginRead
this.SetCompletedSynchronously(asyncResult.CompletedSynchronously);
Stream httpResponseStream = Util.NullCheck(pereq.ResponseStream, InternalError.InvalidEndReadStream); // get the http response stream.
Stream outResponseStream = Util.NullCheck(this.outputResponseStream, InternalError.InvalidEndReadCopy);
byte[] buffer = Util.NullCheck(this.asyncStreamCopyBuffer, InternalError.InvalidEndReadBuffer);
#if PORTABLELIB
count = ((Task <int>)task).Result;
#else
count = httpResponseStream.EndRead(asyncResult);
#endif
this.usingBuffer = false;
if (0 < count)
{
outResponseStream.Write(buffer, 0, count);
}
if (0 < count && 0 < buffer.Length && httpResponseStream.CanRead)
{
if (!asyncResult.CompletedSynchronously)
{
// if CompletedSynchronously then caller will call and we reduce risk of stack overflow
this.ReadResponseStream(asyncStateBag);
}
}
else
{
// Debug.Assert(this.ContentLength < 0 || outResponseStream.Length == this.ContentLength, "didn't read expected ContentLength");
if (outResponseStream.Position < outResponseStream.Length)
{
// In Silverlight, generally 3 bytes less than advertised by ContentLength are read
((MemoryStream)outResponseStream).SetLength(outResponseStream.Position);
}
pereq.SetComplete();
this.SetCompleted();
}
}
catch (Exception e)
{
if (this.HandleFailure(e))
{
throw;
}
}
finally
{
this.HandleCompleted(pereq);
}
}
internal void BeginCreateNextChange()
{
Debug.Assert(!this.IsCompletedInternally, "why being called if already completed?");
// create the memory stream required to cache the responses as we read async from the underlying http web response
this.inMemoryResponseStream = new MemoryStream();
// SaveCallback can't chain synchronously completed responses, caller will loop the to next change
PerRequest pereq = null;
IAsyncResult asyncResult = null;
do
{
IODataResponseMessage responseMsg = null;
ODataRequestMessageWrapper requestMessage = null;
try
{
if (null != this.perRequest)
{
this.SetCompleted();
Error.ThrowInternalError(InternalError.InvalidBeginNextChange);
}
requestMessage = this.CreateNextRequest();
// Keeping the old behavior (V1/V2) where the abortable was set to null,
// if CreateNextRequest returned null.
if (requestMessage == null)
{
this.Abortable = null;
}
if ((null != requestMessage) || (this.entryIndex < this.ChangedEntries.Count))
{
if (this.ChangedEntries[this.entryIndex].ContentGeneratedForSave)
{
Debug.Assert(this.ChangedEntries[this.entryIndex] is LinkDescriptor, "only expected RelatedEnd to presave");
Debug.Assert(
this.ChangedEntries[this.entryIndex].State == EntityStates.Added ||
this.ChangedEntries[this.entryIndex].State == EntityStates.Modified,
"only expected added to presave");
continue;
}
this.Abortable = requestMessage;
ContentStream contentStream = this.CreateNonBatchChangeData(this.entryIndex, requestMessage);
this.perRequest = pereq = new PerRequest();
pereq.Request = requestMessage;
AsyncStateBag asyncStateBag = new AsyncStateBag(pereq);
if (null == contentStream || null == contentStream.Stream)
{
asyncResult = BaseAsyncResult.InvokeAsync(requestMessage.BeginGetResponse, this.AsyncEndGetResponse, asyncStateBag);
}
else
{
if (contentStream.IsKnownMemoryStream)
{
requestMessage.SetContentLengthHeader();
}
pereq.RequestContentStream = contentStream;
asyncResult = BaseAsyncResult.InvokeAsync(requestMessage.BeginGetRequestStream, this.AsyncEndGetRequestStream, asyncStateBag);
}
pereq.SetRequestCompletedSynchronously(asyncResult.CompletedSynchronously);
this.SetCompletedSynchronously(pereq.RequestCompletedSynchronously);
}
else
{
this.SetCompleted();
if (this.CompletedSynchronously)
{
this.HandleCompleted(pereq);
}
}
}
catch (InvalidOperationException e)
{
e = WebUtil.GetHttpWebResponse(e, ref responseMsg);
this.HandleOperationException(e, responseMsg);
this.HandleCompleted(pereq);
}
finally
{
WebUtil.DisposeMessage(responseMsg);
}
// If the current request is completed synchronously, we need to call FinishCurrentChange() to process the response payload.
// FinishCurrentChange() will not call BeginCreateNextChange() when the request is synchronous.
// If the current request is completed asynchronously, an async thread will call FinishCurrentChange() to process the response payload.
// FinishCurrentchange() will then call BeginCreateNextChange() from the async thread and we need to exit this loop.
// If requestMessage = this.CreateNextRequest() returns null, we would have called this.SetCompleted() above and this.IsCompletedInternally
// would be true. This means we are done processing all changed entries and we should not call this.FinishCurrentChange().
if (null != pereq && pereq.RequestCompleted && pereq.RequestCompletedSynchronously && !this.IsCompletedInternally)
{
Debug.Assert(requestMessage != null, "httpWebRequest != null");
this.FinishCurrentChange(pereq);
}
// In the condition for the do-while loop we must test for pereq.RequestCompletedSynchronously and not asyncResult.CompletedSynchronously.
// pereq.RequestCompletedSynchronously is true only if all async calls completed synchronously. If we don't exit this loop when
// pereq.RequestCompletedSynchronously is false, the current thread and an async thread will both re-enter BeginCreateNextChange()
// and we will fail. We can only process one request at a given time.
}
while (((null == pereq) || (pereq.RequestCompleted && pereq.RequestCompletedSynchronously)) && !this.IsCompletedInternally);
Debug.Assert((this.CompletedSynchronously && this.IsCompleted) || !this.CompletedSynchronously, "sync without complete");
Debug.Assert(this.entryIndex < this.ChangedEntries.Count || this.ChangedEntries.All(o => o.ContentGeneratedForSave), "didn't generate content for all entities/links");
}
protected override void AsyncEndGetResponse(IAsyncResult asyncResult)
{
Debug.Assert(asyncResult != null && asyncResult.IsCompleted, "asyncResult.IsCompleted");
AsyncStateBag asyncStateBag = asyncResult.AsyncState as AsyncStateBag;
PerRequest pereq = asyncStateBag == null ? null : asyncStateBag.PerRequest;
try
{
if (this.IsAborted)
{
if (pereq != null)
{
pereq.SetComplete();
}
this.SetCompleted();
}
else
{
this.CompleteCheck(pereq, InternalError.InvalidEndGetResponseCompleted);
pereq.SetRequestCompletedSynchronously(asyncResult.CompletedSynchronously);
this.SetCompletedSynchronously(asyncResult.CompletedSynchronously);
ODataRequestMessageWrapper requestMessage = Util.NullCheck(pereq.Request, InternalError.InvalidEndGetResponseRequest);
// the httpWebResponse is kept for batching, discarded by non-batch
IODataResponseMessage response = this.RequestInfo.EndGetResponse(requestMessage, asyncResult);
pereq.ResponseMessage = Util.NullCheck(response, InternalError.InvalidEndGetResponseResponse);
this.SetHttpWebResponse(pereq.ResponseMessage);
Debug.Assert(null == pereq.ResponseStream, "non-null async ResponseStream");
Stream httpResponseStream = null;
if (HttpStatusCode.NoContent != (HttpStatusCode)response.StatusCode)
{
httpResponseStream = response.GetStream();
pereq.ResponseStream = httpResponseStream;
}
if ((null != httpResponseStream) && httpResponseStream.CanRead)
{
if (null == this.outputResponseStream)
{
// this is the stream we copy the response to
this.outputResponseStream = Util.NullCheck(this.GetAsyncResponseStreamCopy(), InternalError.InvalidAsyncResponseStreamCopy);
}
if (null == this.asyncStreamCopyBuffer)
{
// this is the buffer we read into and copy out of
this.asyncStreamCopyBuffer = Util.NullCheck(this.GetAsyncResponseStreamCopyBuffer(), InternalError.InvalidAsyncResponseStreamCopyBuffer);
}
// Make async calls to read the response stream
this.ReadResponseStream(asyncStateBag);
}
else
{
pereq.SetComplete();
this.SetCompleted();
}
}
}
catch (Exception e)
{
if (this.HandleFailure(e))
{
throw;
}
}
finally
{
this.HandleCompleted(pereq);
}
}
