DupHandleConnectionReader.cs source code in C# .NET

                        Code:
                         / WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / SMSvcHost / System / ServiceModel / Activation / DupHandleConnectionReader.cs / 1 / DupHandleConnectionReader.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.ServiceModel.Activation 
{
    using System; 
    using System.Diagnostics; 
    using System.IO;
    using System.ServiceModel; 
    using System.ServiceModel.Channels;
    using System.Threading;
    using System.ServiceModel.Activation.Diagnostics;
 
    // This class takes a connection, reads enough so that we can dispatch it to another process,
    // and then hands off the connection. This is done for all non-multiplexed modes (singleton, duplex, simplex) 
    abstract class DupHandleConnectionReader : InitialServerConnectionReader 
    {
        byte[] connectionBuffer; 
        ViaDecodedCallback viaDecodedCallback;
        byte[] dataRead;
        int offset;
        static WaitCallback readCallback; 
        int size;
        TransportType transportType; 
        TimeoutHelper receiveTimeoutHelper; 

        protected DupHandleConnectionReader(IConnection connection, 
            ItemDequeuedCallback connectionDequeuedCallback, TransportType transportType,
            int offset, int size, ConnectionClosedCallback closedCallback, ViaDecodedCallback viaDecodedCallback)
            : base(connection, closedCallback, ListenerConstants.MaxUriSize, ListenerConstants.SharedMaxContentTypeSize)
        { 
            this.transportType = transportType;
            this.offset = offset; 
            this.size = size; 
            this.viaDecodedCallback = viaDecodedCallback;
            this.ConnectionDequeuedCallback = connectionDequeuedCallback; 
        }

        TimeSpan GetRemainingTimeout()
        { 
            return this.receiveTimeoutHelper.RemainingTime();
        } 
 
        void AbortAndCount(Exception exception)
        { 
            if (transportType == TransportType.Tcp)
            {
                ListenerPerfCounters.IncrementProtocolFailuresTcp();
            } 
            else if (transportType == TransportType.NamedPipe)
            { 
                ListenerPerfCounters.IncrementProtocolFailuresNamedPipe(); 
            }
 
            base.Abort(exception);
        }

        protected abstract bool CanDupHandle(out Uri viaString); 

        void ContinueReading() 
        { 
            try
            { 
                for (; ; )
                {
                    if (size == 0)
                    { 
                        if (readCallback == null)
                            readCallback = ReadCallback; 
 
                        if (Connection.BeginRead(0, connectionBuffer.Length, GetRemainingTimeout(),
                            readCallback, this) == AsyncReadResult.Queued) 
                        {
                            break;
                        }
                        GetReadResult(); 
                    }
 
                    DiagnosticUtility.DebugAssert(size > 0, ""); 
                    for (; ; )
                    { 
                        int bytesDecoded = Decode(connectionBuffer, offset, size);
                        if (bytesDecoded > 0)
                        {
                            offset += bytesDecoded; 
                            size -= bytesDecoded;
                        } 
 
                        Uri via = null;
                        if (CanDupHandle(out via)) 
                        {
                            ListenerSessionConnection session = new ListenerSessionConnection(
                                this.Connection, this.dataRead, via, this.GetConnectionDequeuedCallback());
                            viaDecodedCallback(this, session); 
                            this.ReleaseConnection();
                            return; 
                        } 

                        if (size == 0) 
                            break;
                    }
                }
            } 
            catch (Exception e)
            { 
                if (DiagnosticUtility.IsFatal(e)) 
                {
                    throw; 
                }

                AbortAndCount(e);
            } 
        }
 
        protected abstract int Decode(byte[] buffer, int offset, int size); 
        protected abstract Exception CreatePrematureEOFException();
 
        void GetReadResult()
        {
            offset = 0;
            size = Connection.EndRead(); 
            if (size == 0)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(CreatePrematureEOFException()); 
            }
            else 
            {
                // update our snapshot of data to shuttle over to the target process
                byte[] newDataRead = new byte[dataRead.Length + size];
                Buffer.BlockCopy(dataRead, 0, newDataRead, 0, dataRead.Length); 
                Buffer.BlockCopy(connectionBuffer, 0, newDataRead, this.dataRead.Length, size);
                dataRead = newDataRead; 
            } 
        }
 
        static void ReadCallback(object state)
        {
            DupHandleConnectionReader reader = (DupHandleConnectionReader)state;
            try 
            {
                reader.GetReadResult(); 
                reader.ContinueReading(); 
            }
            catch (Exception e) 
            {
                if (DiagnosticUtility.IsFatal(e))
                {
                    throw; 
                }
                reader.AbortAndCount(e); 
            } 
        }
 
        public void StartReading(byte[] accruedData, TimeSpan timeout)
        {
            int accruedDataOffset = 0;
            this.receiveTimeoutHelper = new TimeoutHelper(timeout); 

            if (accruedData != null) 
            { 
                this.dataRead = new byte[accruedData.Length + offset + size];
                Buffer.BlockCopy(accruedData, 0, this.dataRead, 0, accruedData.Length); 
                accruedDataOffset = accruedData.Length;
            }
            else
            { 
                this.dataRead = new byte[offset + size];
            } 
 
            this.connectionBuffer = Connection.AsyncReadBuffer;
            Buffer.BlockCopy(this.connectionBuffer, 0, dataRead, accruedDataOffset, offset + size); 

            ContinueReading();
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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DupHandleConnectionReader.cs source code in C# .NET

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