Code:
/ WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / infocard / Service / managed / Microsoft / InfoCards / UIAgentAsyncBeginRequest.cs / 1 / UIAgentAsyncBeginRequest.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- // // Presharp uses the c# pragma mechanism to supress its warnings. // These are not recognised by the base compiler so we need to explictly // disable the following warnings. See http://winweb/cse/Tools/PREsharp/userguide/default.asp // for details. // #pragma warning disable 1634, 1691 // unknown message, unknown pragma namespace Microsoft.InfoCards { using Microsoft.Win32.SafeHandles; using System; using System.Collections; using System.ComponentModel; using System.Diagnostics; using System.Runtime.InteropServices; using System.Text; using System.Threading; using System.IO; using Microsoft.InfoCards.Diagnostics; using IDT = Microsoft.InfoCards.Diagnostics.InfoCardTrace; // // Summary: // Base class for begining any async operations from the UI Agent. // internal abstract class UIAgentAsyncBeginRequest : UIAgentRequest { SafeWaitHandle m_agentEventHandle; int m_asyncHandle; // // Summary: // Creates an new UIAgentAsyncBeginRequest // // Arguments: // rpcHandle: The RPC Context handle. // inArgs: The stream to hold the input arguments // outArgs: The stream to hold the output arguments // parent: the parent UI Request // public UIAgentAsyncBeginRequest( IntPtr rpcHandle, Stream inArgs, Stream outArgs, ClientUIRequest parent ) : base( rpcHandle, inArgs, outArgs, parent ) { } // // Summary: // Reads incoming params. // // Remarks: // Reads the wait handle, and clones it for this process. // protected sealed override void OnMarshalInArgs() { IntPtr nativeEvent = IntPtr.Zero; BinaryReader breader = new InfoCardBinaryReader( InArgs, Encoding.Unicode ); nativeEvent = Utility.ReadHandle( breader ); // // Then translate the remote event handle into a locally valid handle. // using( SafeWaitHandle waitHandle = new SafeWaitHandle( nativeEvent, false ) ) { m_agentEventHandle = Utility.GetLocalHandleFromRemoteHandle( waitHandle, (int) ParentRequest.UIAgentPid ); } OnMarshalAsyncInArgs( breader ); } // // Summary: // Called after the standard async args are already marsheled to allow derived classes to marshal op // specific arguments. // protected virtual void OnMarshalAsyncInArgs( BinaryReader reader ) { // // Default is to do nothing. // } // // Summary: // Process the Begin operateration. // protected override void OnProcess() { AsyncParams param = CreateAsyncParams(); param.AsyncResult.CancelCallback = new RpcAsyncResult.AsyncCancelCallback( AsyncCancel ); IDT.Assert( null != param, "Null AsyncParams" ); try { // // Capture the async context handle. // m_asyncHandle = param.AsyncResult.Handle; IDT.Assert( 0 != m_asyncHandle, "null async context handle" ); // // Start the operation. // if (!ThreadPool.QueueUserWorkItem(IDT.ThunkCallback(new WaitCallback(AsyncEntry)), param)) { throw IDT.ThrowHelperError( new CommunicationException( SR.GetString( SR.UnableToQueueThreadpool ) ) ); } } catch { // // An error occured, be sure to dispose the async context. // Should AsyncParams support dispose? // param.AsyncResult.Dispose(); throw; } } // // Summary: // marshal the base async info out. // protected override void OnMarshalOutArgs() { BinaryWriter bwriter = new BinaryWriter( OutArgs, Encoding.Unicode ); IDT.Assert( 0 != m_asyncHandle, "null async handle" ); bwriter.Write( m_asyncHandle ); } protected override void OnDisposeAsUser() { if( null != m_agentEventHandle ) { m_agentEventHandle.Dispose(); m_agentEventHandle = null; } } // // Summary: // Creates the AsyncParams for the async operation. // // Remarks: // By default, a UIAgentAsyncParams object is created, but derived classes // can change this by returning any AsyncParams derived class. // protected virtual AsyncParams CreateAsyncParams( ) { // // Get the name of this request type. We put this in the asyncParams to make debugging easier. // Type thisType = GetType(); AsyncParams retParams = new UIAgentAsyncParams( thisType.Name, ParentRequest, m_agentEventHandle, this ); // // The asyncParams takes ownership of the handle. // m_agentEventHandle = null; return retParams; } // // Summary: // Abstract entry point for the execution of the async operation. // protected abstract object AsyncExecute( AsyncParams asyncParam ); // // Summary: // Abstract entry point for the cancelation of the async operation. // protected abstract void AsyncCancel( ); // // Summary: // This is a WaitCallback conformant wrapper for Async Requests // // Parameters: // state - An instance of a a AsyncParams class.. // // Remarks: // Running on threadpool thread. // private void AsyncEntry( object state ) { // // Consider for future -- see bug 38733 -- Clear out thread context here (in a finally block) // AsyncParams param = (AsyncParams)state; try { if( param.AsyncResult.IsCanceled ) { param.AsyncResult.Exception = new Win32Exception( NativeMethods.ERROR_CANCELLED ); } else { param.AsyncResult.Result = AsyncExecute( param ); } } #pragma warning disable 56500 // do not catch non-recoverable exceptions catch( Exception e ) { if( IDT.IsFatal( e ) ) { InfoCardService.Crash( e ); } // // Ensure that the result is completed. // // // Even if it is InfoCardBaseException, we're simply transferring it. // param.AsyncResult.Exception = e; } #pragma warning restore 56500 // // The complete method should not throw any exceptions. // param.AsyncResult.Complete(); // // Consider for future -- see bug 38733 -- Clear out thread context here (in a finally block) // } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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