Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / Microsoft / SqlServer / Server / SmiContextFactory.cs / 3 / SmiContextFactory.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- namespace Microsoft.SqlServer.Server { using System; using System.Data.Common; using System.Data.SqlClient; using System.Diagnostics; sealed internal class SmiContextFactory { public static readonly SmiContextFactory Instance = new SmiContextFactory(); private readonly SmiLink _smiLink; private readonly ulong _negotiatedSmiVersion; private readonly byte _majorVersion; private readonly byte _minorVersion; private readonly short _buildNum; private readonly string _serverVersion; private readonly SmiEventSink_Default _eventSinkForGetCurrentContext; internal const ulong YukonVersion = 100; internal const ulong KatmaiVersion = 210; internal const ulong LatestVersion = KatmaiVersion; private readonly ulong[] __supportedSmiVersions = new ulong[] {YukonVersion, KatmaiVersion}; // Used as the key for SmiContext.GetContextValue() internal enum ContextKey { Connection = 0, SqlContext = 1 } private SmiContextFactory() { if (InOutOfProcHelper.InProc) { Type smiLinkType = Type.GetType("Microsoft.SqlServer.Server.InProcLink, SqlAccess, PublicKeyToken=89845dcd8080cc91"); if (null == smiLinkType) { Debug.Assert(false, "could not get InProcLink type"); throw SQL.ContextUnavailableOutOfProc(); // Must not be a valid version of Sql Server. } System.Reflection.FieldInfo instanceField = GetStaticField(smiLinkType, "Instance"); if (instanceField != null) { _smiLink = (SmiLink)GetValue(instanceField); } else { Debug.Assert(false, "could not get InProcLink.Instance"); throw SQL.ContextUnavailableOutOfProc(); // Must not be a valid version of Sql Server. } System.Reflection.FieldInfo buildVersionField = GetStaticField(smiLinkType, "BuildVersion"); if (buildVersionField != null) { UInt32 buildVersion = (UInt32)GetValue(buildVersionField); _majorVersion = (byte)(buildVersion >> 24); _minorVersion = (byte)((buildVersion >> 16) & 0xff); _buildNum = (short)(buildVersion & 0xffff); _serverVersion = (String.Format((IFormatProvider)null, "{0:00}.{1:00}.{2:0000}", _majorVersion, (short) _minorVersion, _buildNum)); } else { _serverVersion = String.Empty; // default value if nothing exists. } _negotiatedSmiVersion = _smiLink.NegotiateVersion(SmiLink.InterfaceVersion); bool isSupportedVersion = false; for(int i=0; !isSupportedVersion && i<__supportedSmiVersions.Length; i++) { if (__supportedSmiVersions[i] == _negotiatedSmiVersion) { isSupportedVersion = true; } } // Disconnect if we didn't get a supported version!! if (!isSupportedVersion) { _smiLink = null; } _eventSinkForGetCurrentContext = new SmiEventSink_Default(); } } internal ulong NegotiatedSmiVersion { get { if (null == _smiLink) { throw SQL.ContextUnavailableOutOfProc(); // Must not be a valid version of Sql Server, or not be SqlCLR } return _negotiatedSmiVersion; } } internal string ServerVersion { get { if (null == _smiLink) { throw SQL.ContextUnavailableOutOfProc(); // Must not be a valid version of Sql Server, or not be SqlCLR } return _serverVersion; } } internal SmiContext GetCurrentContext() { if (null == _smiLink) { throw SQL.ContextUnavailableOutOfProc(); // Must not be a valid version of Sql Server, or not be SqlCLR } object result = _smiLink.GetCurrentContext(_eventSinkForGetCurrentContext); _eventSinkForGetCurrentContext.ProcessMessagesAndThrow(); if (null == result) { throw SQL.ContextUnavailableWhileInProc(); } Debug.Assert(typeof(SmiContext).IsInstanceOfType(result), "didn't get SmiContext from GetCurrentContext?"); return (SmiContext)result; } [System.Security.Permissions.ReflectionPermission(System.Security.Permissions.SecurityAction.Assert, MemberAccess=true)] private object GetValue(System.Reflection.FieldInfo fieldInfo) { object result = fieldInfo.GetValue(null); return result; } [System.Security.Permissions.ReflectionPermission(System.Security.Permissions.SecurityAction.Assert, MemberAccess=true)] private System.Reflection.FieldInfo GetStaticField(Type aType, string fieldName) { System.Reflection.FieldInfo result = aType.GetField(fieldName, System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.GetField); return result; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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