/// <summary>
/// Asynchronously starts a new changeset - implementation of the actual functionality.
/// </summary>
/// <param name="changesetId">The value for changeset boundary for multipart batch.</param>
/// <returns>A task that represents the asynchronous write operation.</returns>
protected override async Task WriteStartChangesetImplementationAsync(string changesetId)
{
Debug.Assert(changesetId != null, "changesetId != null");
// Write pending message data (headers, response line) for a previously unclosed message/request
await this.WritePendingMessageDataAsync(true)
.ConfigureAwait(false);
this.SetState(BatchWriterState.ChangesetStarted);
Debug.Assert(this.changeSetBoundary == null, "this.changeSetBoundary == null");
this.changeSetBoundary = ODataMultipartMixedBatchWriterUtils.CreateChangeSetBoundary(this.RawOutputContext.WritingResponse, changesetId);
// Write the boundary string
await ODataMultipartMixedBatchWriterUtils.WriteStartBoundaryAsync(
this.RawOutputContext.TextWriter,
this.batchBoundary,
!this.batchStartBoundaryWritten).ConfigureAwait(false);
this.batchStartBoundaryWritten = true;
// Write the changeset headers
await ODataMultipartMixedBatchWriterUtils.WriteChangesetPreambleAsync(
this.RawOutputContext.TextWriter,
this.changeSetBoundary).ConfigureAwait(false);
this.changesetStartBoundaryWritten = false;
// Set state to track dependsOnIds.
this.dependsOnIdsTracker.ChangeSetStarted();
}
/// <summary>
/// Asynchronously writes the start boundary for an operation. This is either the batch or the changeset boundary.
/// </summary>
/// <returns>A task that represents the asynchronous write operation.</returns>
private async Task WriteStartBoundaryForOperationAsync()
{
if (this.changeSetBoundary == null)
{
await ODataMultipartMixedBatchWriterUtils.WriteStartBoundaryAsync(
this.RawOutputContext.TextWriter,
this.batchBoundary,
!this.batchStartBoundaryWritten).ConfigureAwait(false);
this.batchStartBoundaryWritten = true;
}
else
{
await ODataMultipartMixedBatchWriterUtils.WriteStartBoundaryAsync(
this.RawOutputContext.TextWriter,
this.changeSetBoundary,
!this.changesetStartBoundaryWritten).ConfigureAwait(false);
this.changesetStartBoundaryWritten = true;
}
}