示例#1
0
        /// <summary>
        /// Creates a cursor. Cursors are used to consume a stream, starting from a specific point in the partition and going forward from there.
        /// You can create a cursor based on an offset, a time, the trim horizon, or the most recent message in the stream. As the oldest message
        /// inside the retention period boundary, using the trim horizon effectively lets you consume all messages in the stream. A cursor based
        /// on the most recent message allows consumption of only messages that are added to the stream after you create the cursor. Cursors expire
        /// five minutes after you receive them from the service.
        ///
        /// </summary>
        /// <param name="request">The request object containing the details to send. Required.</param>
        /// <param name="retryConfiguration">The retry configuration that will be used by to send this request. Optional.</param>
        /// <param name="cancellationToken">The cancellation token to cancel this operation. Optional.</param>
        /// <returns>A response object containing details about the completed operation</returns>
        /// <example>Click <a href="https://docs.cloud.oracle.com/en-us/iaas/tools/dot-net-examples/latest/streaming/CreateCursor.cs.html">here</a> to see an example of how to use CreateCursor API.</example>
        public async Task <CreateCursorResponse> CreateCursor(CreateCursorRequest request, RetryConfiguration retryConfiguration = null, CancellationToken cancellationToken = default)
        {
            logger.Trace("Called createCursor");
            Uri                uri            = new Uri(this.restClient.GetEndpoint(), System.IO.Path.Combine(basePathWithoutHost, "/streams/{streamId}/cursors".Trim('/')));
            HttpMethod         method         = new HttpMethod("POST");
            HttpRequestMessage requestMessage = Converter.ToHttpRequestMessage(uri, method, request);

            requestMessage.Headers.Add("Accept", "application/json");
            GenericRetrier      retryingClient = Retrier.GetPreferredRetrier(retryConfiguration, this.retryConfiguration);
            HttpResponseMessage responseMessage;

            try
            {
                if (retryingClient != null)
                {
                    responseMessage = await retryingClient.MakeRetryingCall(this.restClient.HttpSend, requestMessage, cancellationToken).ConfigureAwait(false);
                }
                else
                {
                    responseMessage = await this.restClient.HttpSend(requestMessage).ConfigureAwait(false);
                }
                this.restClient.CheckHttpResponseMessage(requestMessage, responseMessage);

                return(Converter.FromHttpResponseMessage <CreateCursorResponse>(responseMessage));
            }
            catch (Exception e)
            {
                logger.Error($"CreateCursor failed with error: {e.Message}");
                throw;
            }
        }
示例#2
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        private static async Task <string> GetCursorByPartition(StreamClient streamClient, string streamId, string partition)
        {
            logger.Info($"Creating a cursor for partition {partition}");

            CreateCursorDetails createCursorDetails = new CreateCursorDetails
            {
                Partition = partition,
                Type      = CreateCursorDetails.TypeEnum.TrimHorizon
            };
            CreateCursorRequest createCursorRequest = new CreateCursorRequest
            {
                StreamId            = streamId,
                CreateCursorDetails = createCursorDetails
            };
            CreateCursorResponse createCursorResponse = await streamClient.CreateCursor(createCursorRequest);

            return(createCursorResponse.Cursor.Value);
        }
        protected override void ProcessRecord()
        {
            base.ProcessRecord();
            CreateCursorRequest request;

            try
            {
                request = new CreateCursorRequest
                {
                    StreamId            = StreamId,
                    CreateCursorDetails = CreateCursorDetails,
                    OpcRequestId        = OpcRequestId
                };

                response = client.CreateCursor(request).GetAwaiter().GetResult();
                WriteOutput(response, response.Cursor);
                FinishProcessing(response);
            }
            catch (Exception ex)
            {
                TerminatingErrorDuringExecution(ex);
            }
        }