OciLobLocator.cs source code in C# .NET

                        Code:
                         / Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / DataOracleClient / System / Data / OracleClient / OciLobLocator.cs / 1 / OciLobLocator.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
namespace System.Data.OracleClient 
{
    using System; 
    using System.Data.Common;
    using System.Data.SqlTypes;
    using System.Diagnostics;
    using System.Globalization; 
    using System.IO;
    using System.Runtime.ConstrainedExecution; 
    using System.Runtime.InteropServices; 
    using System.Text;
    using System.Threading; 

    sealed internal class OciLobLocator {
        private OracleConnection    _connection;            // the connection the lob is attached to
        private int                 _connectionCloseCount;  // The close count of the connection; used to decide if we're zombied 
        private OracleType          _lobType;               // the underlying data type of the LOB locator
        private OciHandle           _descriptor;            // the lob/file descriptor. 
        private int                 _cloneCount;            // the number of clones of this object -- used to know when we can close the lob/bfile. 
        private int                 _openMode;              // zero when not opened, otherwise, it's the value of OracleLobOpenMode
 
        internal OciLobLocator(OracleConnection connection, OracleType lobType) {
            _connection             = connection;
            _connectionCloseCount   = connection.CloseCount;
            _lobType                = lobType; 
            _cloneCount             = 1;
 
            switch (lobType) { 
            case OracleType.Blob:
            case OracleType.Clob: 
            case OracleType.NClob:
                _descriptor = new OciLobDescriptor(connection.ServiceContextHandle);
                break;
            case OracleType.BFile: 
                _descriptor = new OciFileDescriptor(connection.ServiceContextHandle);
                break; 
 
            default:
                Debug.Assert(false, "Invalid lobType"); 
                break;
            }
        }
 
        internal OracleConnection Connection {
            get { 
                return _connection; 
            }
        } 

        internal bool ConnectionIsClosed {
            //  returns TRUE when the parent connection object has been closed
            get { 
                return (null == _connection) || (_connectionCloseCount != _connection.CloseCount);
            } 
        } 

        internal OciErrorHandle ErrorHandle { 
            //  Every OCI call needs an error handle, so make it available
            //  internally.
            get {
                return Connection.ErrorHandle; 
            }
        } 
 
        internal OciHandle Descriptor {
            [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] 
            get {
                return _descriptor;
            }
        } 

        public OracleType LobType { 
            get { 
                return _lobType;
            } 
        }

        internal OciServiceContextHandle ServiceContextHandle {
            //  You need to provide the service context handle to things like the 
            //  OCI execute call so a statement handle can be associated with a
            //  connection.  Better make it available internally, then. 
 
            get {
                return Connection.ServiceContextHandle; 
            }
        }

        internal OciLobLocator Clone() { 
            Interlocked.Increment(ref _cloneCount);
            return this; 
        } 

        internal void Dispose() { 
            int cloneCount = Interlocked.Decrement(ref _cloneCount);

            if (0 == cloneCount) {
                if (0 != _openMode && !ConnectionIsClosed) { 
                    ForceClose();
                } 
                OciHandle.SafeDispose(ref _descriptor); 
                GC.KeepAlive(this);
                _connection = null; 
            }
        }

        internal void ForceClose() { 
            if (0 != _openMode) {
                int rc = TracedNativeMethods.OCILobClose( 
                                        ServiceContextHandle, 
                                        ErrorHandle,
                                        Descriptor 
                                        );
                if (0 != rc) {
                    Connection.CheckError(ErrorHandle, rc);
                } 
                _openMode = 0;
            } 
        } 

        internal void ForceOpen() { 
            if (0 != _openMode) {
                int rc = TracedNativeMethods.OCILobOpen(
                                            ServiceContextHandle,
                                            ErrorHandle, 
                                            Descriptor,
                                            (byte)_openMode 
                                            ); 
                if (0 != rc) {
                    _openMode = 0; // failure means we didn't really open it. 
                    Connection.CheckError(ErrorHandle, rc);
                }
            }
        } 

        internal void Open (OracleLobOpenMode mode) { 
            OracleLobOpenMode openMode = (OracleLobOpenMode)Interlocked.CompareExchange(ref _openMode, (int)mode, 0); 
            if (0 == openMode) {
                ForceOpen(); 
            }
            else if (mode != openMode) {
                throw ADP.CannotOpenLobWithDifferentMode(mode, openMode);
            } 
        }
 
        internal static void SafeDispose(ref OciLobLocator locator) { 
            //  Safely disposes of the handle (even if it is already null) and
            //  then nulls it out. 
            if (null != locator) {
                locator.Dispose();
            }
            locator = null; 
        }
    } 
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
namespace System.Data.OracleClient 
{
    using System; 
    using System.Data.Common;
    using System.Data.SqlTypes;
    using System.Diagnostics;
    using System.Globalization; 
    using System.IO;
    using System.Runtime.ConstrainedExecution; 
    using System.Runtime.InteropServices; 
    using System.Text;
    using System.Threading; 

    sealed internal class OciLobLocator {
        private OracleConnection    _connection;            // the connection the lob is attached to
        private int                 _connectionCloseCount;  // The close count of the connection; used to decide if we're zombied 
        private OracleType          _lobType;               // the underlying data type of the LOB locator
        private OciHandle           _descriptor;            // the lob/file descriptor. 
        private int                 _cloneCount;            // the number of clones of this object -- used to know when we can close the lob/bfile. 
        private int                 _openMode;              // zero when not opened, otherwise, it's the value of OracleLobOpenMode
 
        internal OciLobLocator(OracleConnection connection, OracleType lobType) {
            _connection             = connection;
            _connectionCloseCount   = connection.CloseCount;
            _lobType                = lobType; 
            _cloneCount             = 1;
 
            switch (lobType) { 
            case OracleType.Blob:
            case OracleType.Clob: 
            case OracleType.NClob:
                _descriptor = new OciLobDescriptor(connection.ServiceContextHandle);
                break;
            case OracleType.BFile: 
                _descriptor = new OciFileDescriptor(connection.ServiceContextHandle);
                break; 
 
            default:
                Debug.Assert(false, "Invalid lobType"); 
                break;
            }
        }
 
        internal OracleConnection Connection {
            get { 
                return _connection; 
            }
        } 

        internal bool ConnectionIsClosed {
            //  returns TRUE when the parent connection object has been closed
            get { 
                return (null == _connection) || (_connectionCloseCount != _connection.CloseCount);
            } 
        } 

        internal OciErrorHandle ErrorHandle { 
            //  Every OCI call needs an error handle, so make it available
            //  internally.
            get {
                return Connection.ErrorHandle; 
            }
        } 
 
        internal OciHandle Descriptor {
            [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] 
            get {
                return _descriptor;
            }
        } 

        public OracleType LobType { 
            get { 
                return _lobType;
            } 
        }

        internal OciServiceContextHandle ServiceContextHandle {
            //  You need to provide the service context handle to things like the 
            //  OCI execute call so a statement handle can be associated with a
            //  connection.  Better make it available internally, then. 
 
            get {
                return Connection.ServiceContextHandle; 
            }
        }

        internal OciLobLocator Clone() { 
            Interlocked.Increment(ref _cloneCount);
            return this; 
        } 

        internal void Dispose() { 
            int cloneCount = Interlocked.Decrement(ref _cloneCount);

            if (0 == cloneCount) {
                if (0 != _openMode && !ConnectionIsClosed) { 
                    ForceClose();
                } 
                OciHandle.SafeDispose(ref _descriptor); 
                GC.KeepAlive(this);
                _connection = null; 
            }
        }

        internal void ForceClose() { 
            if (0 != _openMode) {
                int rc = TracedNativeMethods.OCILobClose( 
                                        ServiceContextHandle, 
                                        ErrorHandle,
                                        Descriptor 
                                        );
                if (0 != rc) {
                    Connection.CheckError(ErrorHandle, rc);
                } 
                _openMode = 0;
            } 
        } 

        internal void ForceOpen() { 
            if (0 != _openMode) {
                int rc = TracedNativeMethods.OCILobOpen(
                                            ServiceContextHandle,
                                            ErrorHandle, 
                                            Descriptor,
                                            (byte)_openMode 
                                            ); 
                if (0 != rc) {
                    _openMode = 0; // failure means we didn't really open it. 
                    Connection.CheckError(ErrorHandle, rc);
                }
            }
        } 

        internal void Open (OracleLobOpenMode mode) { 
            OracleLobOpenMode openMode = (OracleLobOpenMode)Interlocked.CompareExchange(ref _openMode, (int)mode, 0); 
            if (0 == openMode) {
                ForceOpen(); 
            }
            else if (mode != openMode) {
                throw ADP.CannotOpenLobWithDifferentMode(mode, openMode);
            } 
        }
 
        internal static void SafeDispose(ref OciLobLocator locator) { 
            //  Safely disposes of the handle (even if it is already null) and
            //  then nulls it out. 
            if (null != locator) {
                locator.Dispose();
            }
            locator = null; 
        }
    } 
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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