Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / 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.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- DefaultClaimSet.cs
- MetafileHeaderEmf.cs
- MessageSmuggler.cs
- Material.cs
- RectKeyFrameCollection.cs
- DbConnectionPoolGroup.cs
- DoubleKeyFrameCollection.cs
- AssemblyCache.cs
- CollectionBuilder.cs
- InstalledFontCollection.cs
- CachedFontFace.cs
- GuidTagList.cs
- DataBinder.cs
- SafeFileHandle.cs
- PagedDataSource.cs
- DataGridViewColumnCollection.cs
- WebPartTransformerAttribute.cs
- TdsParameterSetter.cs
- SystemPens.cs
- formatstringdialog.cs
- RelationshipDetailsRow.cs
- DataGridViewSelectedCellCollection.cs
- IsolationInterop.cs
- DockPanel.cs
- ProcessHostFactoryHelper.cs
- ListViewInsertedEventArgs.cs
- WindowsTreeView.cs
- DataSysAttribute.cs
- LinearQuaternionKeyFrame.cs
- AttributeProviderAttribute.cs
- DataControlPagerLinkButton.cs
- ToolStripContentPanelRenderEventArgs.cs
- NetworkInformationPermission.cs
- SystemTcpStatistics.cs
- CodeAccessSecurityEngine.cs
- DataGridAutomationPeer.cs
- UserControlBuildProvider.cs
- PersonalizablePropertyEntry.cs
- DataException.cs
- MultiBindingExpression.cs
- WeakKeyDictionary.cs
- Label.cs
- GradientStop.cs
- BinaryMethodMessage.cs
- TreeNodeMouseHoverEvent.cs
- PersonalizationDictionary.cs
- ScrollChrome.cs
- odbcmetadatacolumnnames.cs
- Wrapper.cs
- AllMembershipCondition.cs
- FormsAuthenticationUser.cs
- AbandonedMutexException.cs
- TextServicesCompartment.cs
- Geometry.cs
- BamlResourceContent.cs
- VarRefManager.cs
- ToolStrip.cs
- MetadataSource.cs
- XmlByteStreamWriter.cs
- InternalConfigHost.cs
- HybridDictionary.cs
- Logging.cs
- WasEndpointConfigContainer.cs
- DataBindingExpressionBuilder.cs
- ListenerElementsCollection.cs
- LoginView.cs
- XNodeSchemaApplier.cs
- UIElement3D.cs
- Point3DCollection.cs
- DataSourceView.cs
- BuildProvidersCompiler.cs
- RecognitionResult.cs
- KerberosRequestorSecurityToken.cs
- EditorAttribute.cs
- ExtensionFile.cs
- BitmapFrameEncode.cs
- ScrollViewer.cs
- UriWriter.cs
- PeerNameResolver.cs
- CodeAccessPermission.cs
- PrintPreviewGraphics.cs
- TrackingParameters.cs
- EngineSite.cs
- SingleAnimation.cs
- BooleanExpr.cs
- CollectionMarkupSerializer.cs
- TimeEnumHelper.cs
- ProfileService.cs
- RotateTransform3D.cs
- RegexCapture.cs
- StructureChangedEventArgs.cs
- HotSpotCollectionEditor.cs
- GridToolTip.cs
- ToolstripProfessionalRenderer.cs
- SafeNativeMethods.cs
- httpstaticobjectscollection.cs
- AuthenticationServiceManager.cs
- XmlSignificantWhitespace.cs
- NavigationCommands.cs
- ParameterBuilder.cs