/// <summary>
/// Ends the asynchronous query request.
/// </summary>
/// <typeparam name="TElement">Element type of the result.</typeparam>
/// <param name="source">Source object of async request.</param>
/// <param name="method">async method name.</param>
/// <param name="asyncResult">The asyncResult being ended.</param>
/// <returns>Data service response.</returns>
internal static QueryResult EndExecuteQuery <TElement>(object source, string method, IAsyncResult asyncResult)
{
QueryResult response = null;
try
{
response = BaseAsyncResult.EndExecute <QueryResult>(source, method, asyncResult);
}
catch (InvalidOperationException ex)
{
response = asyncResult as QueryResult;
Debug.Assert(response != null, "response != null, BaseAsyncResult.EndExecute() would have thrown a different exception otherwise.");
QueryOperationResponse operationResponse = response.GetResponse <TElement>(MaterializeAtom.EmptyResults);
if (operationResponse != null)
{
operationResponse.Error = ex;
throw new DataServiceQueryException(Strings.DataServiceException_GeneralError, ex, operationResponse);
}
throw;
}
return(response);
}
/// <summary>
/// Make async calls to read the response stream.
/// </summary>
/// <param name="asyncStateBag">the state containing the information about the asynchronous operation.</param>
private void ReadResponseStream(AsyncStateBag asyncStateBag)
{
Debug.Assert(asyncStateBag != null, "asyncStateBag != null");
PerRequest pereq = asyncStateBag.PerRequest;
IAsyncResult asyncResult = null;
byte[] buffer = this.asyncStreamCopyBuffer;
Stream httpResponseStream = pereq.ResponseStream;
do
{
int bufferOffset = 0;
int bufferLength = buffer.Length;
this.usingBuffer = true;
#if WINRT
asyncResult = BaseAsyncResult.InvokeTask(httpResponseStream.ReadAsync, buffer, bufferOffset, bufferLength, this.AsyncEndRead, asyncStateBag);
#else
asyncResult = BaseAsyncResult.InvokeAsync(httpResponseStream.BeginRead, buffer, bufferOffset, bufferLength, this.AsyncEndRead, asyncStateBag);
#endif
pereq.SetRequestCompletedSynchronously(asyncResult.CompletedSynchronously);
this.SetCompletedSynchronously(asyncResult.CompletedSynchronously); // BeginRead
}while (asyncResult.CompletedSynchronously && !pereq.RequestCompleted && !this.IsCompletedInternally && httpResponseStream.CanRead);
Debug.Assert((!this.CompletedSynchronously && !pereq.RequestCompletedSynchronously) || this.IsCompletedInternally || pereq.RequestCompleted, "AsyncEndGetResponse !IsCompleted");
}
internal void BeginExecuteQuery()
{
IAsyncResult asyncResult = null;
PerRequest pereq = new PerRequest();
AsyncStateBag asyncStateBag = new AsyncStateBag(pereq);
pereq.Request = this.Request;
this.perRequest = pereq;
try
{
if (this.requestContentStream != null && this.requestContentStream.Stream != null)
{
if (this.requestContentStream.IsKnownMemoryStream)
{
this.Request.SetContentLengthHeader();
}
this.perRequest.RequestContentStream = this.requestContentStream;
asyncResult = BaseAsyncResult.InvokeAsync(this.Request.BeginGetRequestStream, this.AsyncEndGetRequestStream, asyncStateBag);
}
else
{
asyncResult = BaseAsyncResult.InvokeAsync(this.Request.BeginGetResponse, this.AsyncEndGetResponse, asyncStateBag);
}
// TODO: 298920: Async execute methods for query (QueryResult.cs), should not need to maintain "CompletedSynchronously" information in two state variables.
pereq.SetRequestCompletedSynchronously(asyncResult.CompletedSynchronously);
this.SetCompletedSynchronously(asyncResult.CompletedSynchronously);
}
catch (Exception e)
{
this.HandleFailure(e);
throw;
}
finally
{
this.HandleCompleted(pereq);
}
Debug.Assert((!this.CompletedSynchronously && !pereq.RequestCompletedSynchronously) || this.IsCompleted, "if CompletedSynchronously then MUST IsCompleted");
}
internal void Begin()
{
try
{
IAsyncResult asyncResult = BaseAsyncResult.InvokeAsync(this.requestMessage.BeginGetResponse, this.AsyncEndGetResponse, null);
this.SetCompletedSynchronously(asyncResult.CompletedSynchronously);
}
catch (Exception e)
{
this.HandleFailure(e);
throw;
}
finally
{
this.HandleCompleted();
}
Debug.Assert(!this.CompletedSynchronously || this.IsCompleted, "if CompletedSynchronously then MUST IsCompleted");
}
/// <summary>initial the async batch save changeset</summary>
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");
}
/// <summary>Set the AsyncWait and invoke the user callback.</summary>
/// <param name="pereq">the request object</param>
/// <remarks>This method is not implemented for this class.</remarks>
protected override void HandleCompleted(BaseAsyncResult.PerRequest pereq)
{
Debug.Assert(false, "This method should never be called from GetReadStreamResult.");
Error.ThrowInternalError(InternalError.InvalidHandleCompleted);
}
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 (this.perRequest != null)
{
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 ((requestMessage != null) || (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 (contentStream == null || contentStream.Stream == null)
{
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 (pereq != null && 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 (((pereq == null) || (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 FinishCurrentChange(BaseAsyncResult.PerRequest pereq)
{
base.FinishCurrentChange(pereq);
this.ResponseStream.Position = 0L;
base.perRequest = null;
base.SetCompleted();
}
protected override void FinishCurrentChange(BaseAsyncResult.PerRequest pereq)
{
base.FinishCurrentChange(pereq);
if (this.ResponseStream.Position != 0L)
{
this.ResponseStream.Position = 0L;
this.HandleOperationResponseData(this.httpWebResponse, this.ResponseStream);
}
else
{
this.HandleOperationResponseData(this.httpWebResponse, null);
}
pereq.Dispose();
base.perRequest = null;
if (!pereq.RequestCompletedSynchronously && !base.IsCompletedInternally)
{
this.BeginCreateNextChange();
}
}
internal AsyncReadState(BaseAsyncResult.PerRequest pereq)
{
this.Pereq = pereq;
this.totalByteCopied = 0;
}
protected override void HandleCompleted(BaseAsyncResult.PerRequest pereq)
{
if (pereq != null)
{
base.SetCompletedSynchronously(pereq.RequestCompletedSynchronously);
if (pereq.RequestCompleted)
{
Interlocked.CompareExchange<BaseAsyncResult.PerRequest>(ref this.perRequest, null, pereq);
if (this.IsBatch)
{
Interlocked.CompareExchange<HttpWebResponse>(ref this.batchResponse, pereq.HttpWebResponse, null);
pereq.HttpWebResponse = null;
}
pereq.Dispose();
}
}
base.HandleCompleted();
}
protected override void HandleCompleted(BaseAsyncResult.PerRequest pereq)
{
Error.ThrowInternalError(InternalError.InvalidHandleCompleted);
}
