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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataWeb / Server / System / Data / Services / BatchServiceHost.cs / 1305376 / BatchServiceHost.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // //// Provides an internal implementation for IDataServiceHost to keep track of states // for batch operations // // // @owner [....] //--------------------------------------------------------------------- namespace System.Data.Services { #region Namespaces. using System; using System.Collections.Generic; using System.Collections.Specialized; using System.Diagnostics; using System.IO; using System.Web; using System.Net; #endregion Namespaces. ////// Keeps track of the request and response headers for each /// operation in the batch /// internal class BatchServiceHost : IDataServiceHost2 { #region Private fields. ///Response separator string. private readonly string boundary; ///Request Stream. private readonly Stream requestStream; ///Content Id for this operation. private readonly string contentId; ///Output writer. private readonly StreamWriter writer; ///Gets the absolute URI to the resource upon which to apply the request. private readonly Uri absoluteRequestUri; ///Gets the absolute URI to the service. private readonly Uri absoluteServiceUri; ///Request Http Method private readonly string requestHttpMethod; ///Collection of request headers for the current batch operation. private readonly WebHeaderCollection requestHeaders; ///Collection of response headers for the current batch operation. private readonly WebHeaderCollection responseHeaders; ///List of query parameters as specified in the request uri. private NameValueCollection queryParameters; ///Value of the response StatusCode header. private int responseStatusCode; #endregion Private fields. #region Constructors. ////// Initializes a new dummy host for the batch request. /// This host represents a single operation in the batch. /// /// absolute Uri to the service /// batch stream which contains the header information. /// content id for the given operation host. /// Response separator string. /// Output writer. internal BatchServiceHost(Uri absoluteServiceUri, BatchStream batchStream, string contentId, string boundary, StreamWriter writer) : this(boundary, writer) { Debug.Assert(absoluteServiceUri != null && absoluteServiceUri.IsAbsoluteUri, "absoluteServiceUri != null && absoluteServiceUri.IsAbsoluteUri"); Debug.Assert(batchStream != null, "batchStream != null"); this.absoluteServiceUri = absoluteServiceUri; this.absoluteRequestUri = RequestUriProcessor.GetAbsoluteUriFromReference(batchStream.ContentUri, absoluteServiceUri); this.requestHttpMethod = GetHttpMethodName(batchStream.State); this.requestStream = batchStream.GetContentStream(); this.contentId = contentId; foreach (KeyValuePairheader in batchStream.ContentHeaders) { this.requestHeaders.Add(header.Key, header.Value); } } /// /// Initializes a host for error scenarios - something to which we can write the response header values /// and write them to the underlying stream. /// /// Response separator string. /// Output writer. internal BatchServiceHost(string boundary, StreamWriter writer) { Debug.Assert(!string.IsNullOrEmpty(boundary), "!string.IsNullOrEmpty(boundary)"); Debug.Assert(writer != null, "writer != null"); this.boundary = boundary; this.writer = writer; this.requestHeaders = new WebHeaderCollection(); this.responseHeaders = new WebHeaderCollection(); } #endregion Constructors. #region Properties. ///Gets the absolute URI to the resource upon which to apply the request. Uri IDataServiceHost.AbsoluteRequestUri { [DebuggerStepThrough] get { return this.absoluteRequestUri; } } ///Gets the absolute URI to the service. Uri IDataServiceHost.AbsoluteServiceUri { [DebuggerStepThrough] get { return this.absoluteServiceUri; } } ////// Gets the character set encoding that the client requested, /// possibly null. /// string IDataServiceHost.RequestAccept { get { return this.requestHeaders[HttpRequestHeader.Accept]; } } ////// Gets the character set encoding that the client requested, /// possibly null. /// string IDataServiceHost.RequestAcceptCharSet { get { return this.requestHeaders[HttpRequestHeader.AcceptCharset]; } } ///Gets the HTTP MIME type of the input stream. string IDataServiceHost.RequestContentType { get { return this.requestHeaders[HttpRequestHeader.ContentType]; } } ////// Gets the HTTP data transfer method (such as GET, POST, or HEAD) used by the client. /// string IDataServiceHost.RequestHttpMethod { [DebuggerStepThrough] get { return this.requestHttpMethod; } } ///Gets the value of the If-Match header from the request made string IDataServiceHost.RequestIfMatch { get { return this.requestHeaders[HttpRequestHeader.IfMatch]; } } ///Gets the value of the If-None-Match header from the request made string IDataServiceHost.RequestIfNoneMatch { get { return this.requestHeaders[HttpRequestHeader.IfNoneMatch]; } } ///Gets the value for the MaxDataServiceVersion request header. string IDataServiceHost.RequestMaxVersion { get { return this.requestHeaders[XmlConstants.HttpMaxDataServiceVersion]; } } ///Gets the value for the DataServiceVersion request header. string IDataServiceHost.RequestVersion { get { return this.requestHeaders[XmlConstants.HttpDataServiceVersion]; } } ///Gets or sets the Cache-Control header on the response. string IDataServiceHost.ResponseCacheControl { get { return this.responseHeaders[HttpResponseHeader.CacheControl]; } set { this.responseHeaders[HttpResponseHeader.CacheControl] = value; } } ///Gets or sets the HTTP MIME type of the output stream. string IDataServiceHost.ResponseContentType { get { return this.responseHeaders[HttpResponseHeader.ContentType]; } set { this.responseHeaders[HttpResponseHeader.ContentType] = value; } } ///Gets/Sets the value of the ETag header on the outgoing response string IDataServiceHost.ResponseETag { get { return this.responseHeaders[HttpResponseHeader.ETag]; } set { this.responseHeaders[HttpResponseHeader.ETag] = value; } } ///Gets or sets the Location header on the response. string IDataServiceHost.ResponseLocation { get { return this.responseHeaders[HttpResponseHeader.Location]; } set { this.responseHeaders[HttpResponseHeader.Location] = value; } } ////// Gets/Sets the status code for the request made. /// int IDataServiceHost.ResponseStatusCode { get { return this.responseStatusCode; } set { this.responseStatusCode = value; } } ////// Gets the Stream IDataServiceHost.ResponseStream { get { // There is a batch stream for writing requests for batch operations. // Hence this method should never be called. throw Error.NotSupported(); } } ///to be written to send a response /// to the client. /// Gets or sets the value for the DataServiceVersion response header. string IDataServiceHost.ResponseVersion { get { return this.responseHeaders[XmlConstants.HttpDataServiceVersion]; } set { this.responseHeaders[XmlConstants.HttpDataServiceVersion] = value; } } ////// Gets the Stream IDataServiceHost.RequestStream { [DebuggerStepThrough] get { return this.requestStream; } } #region IDataServiceHost2 Properties ///from which the request data can be read from /// to the client. /// Dictionary of all request headers. WebHeaderCollection IDataServiceHost2.RequestHeaders { get { return this.requestHeaders; } } ///Enumerates all response headers that has been set. WebHeaderCollection IDataServiceHost2.ResponseHeaders { get { return this.responseHeaders; } } #endregion IDataServiceHost2 Properties ///Response separator string. internal string BoundaryString { get { return this.boundary; } } ////// Gets/Sets the content id as specified in the batch request. /// This same value is written out in the response headers also to allow mapping requests on the client. /// internal string ContentId { get { return this.contentId; } } ///Output writer. internal StreamWriter Writer { get { return this.writer; } } #endregion Properties. #region Methods. ///Gets the value for the specified item in the request query string. /// Item to return. ////// The value for the specified item in the request query string; /// null if string IDataServiceHost.GetQueryStringItem(string item) { this.GetUriAndQueryParameters(); string[] result = this.queryParameters.GetValues(item); if (result == null || result.Length == 0) { return null; } else if (result.Length == 1) { return result[0]; } else { throw DataServiceException.CreateBadRequestError( Strings.DataServiceHost_MoreThanOneQueryParameterSpecifiedWithTheGivenName(item, this.absoluteRequestUri)); } } ///is not found. /// Method to handle a data service exception during processing. /// Exception handling description. void IDataServiceHost.ProcessException(HandleExceptionArgs args) { // This would typically set headers on the host. WebUtil.CheckArgumentNull(args, "args"); Debug.Assert(WebUtil.IsCatchableExceptionType(args.Exception), "WebUtil.IsCatchableExceptionType(args.Exception)"); this.responseStatusCode = args.ResponseStatusCode; this.responseHeaders[HttpResponseHeader.ContentType] = args.ResponseContentType; this.responseHeaders[HttpResponseHeader.Allow] = args.ResponseAllowHeader; // Only write the headers if the response is not written if (!args.ResponseWritten) { System.Data.Services.Serializers.BatchWriter.WriteBoundaryAndHeaders(this.writer, this, this.contentId, this.boundary); } } ////// Returns the http method name given the batch stream state /// /// state of the batch stream. ///returns the http method name private static string GetHttpMethodName(BatchStreamState state) { Debug.Assert( state == BatchStreamState.Get || state == BatchStreamState.Post || state == BatchStreamState.Put || state == BatchStreamState.Delete || state == BatchStreamState.Merge, "Expecting BatchStreamState (" + state + ") to be Delete, Get, Post or Put"); switch (state) { case BatchStreamState.Delete: return XmlConstants.HttpMethodDelete; case BatchStreamState.Get: return XmlConstants.HttpMethodGet; case BatchStreamState.Post: return XmlConstants.HttpMethodPost; case BatchStreamState.Merge: return XmlConstants.HttpMethodMerge; default: Debug.Assert(BatchStreamState.Put == state, "BatchStreamState.Put == state"); return XmlConstants.HttpMethodPut; } } ////// Given the request uri, parse the uri and query parameters and cache them /// private void GetUriAndQueryParameters() { if (this.queryParameters == null) { this.queryParameters = HttpUtility.ParseQueryString(this.absoluteRequestUri.Query); } } #endregion Methods. } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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