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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