Code:
/ WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / Tools / comsvcutil / AtomicFile.cs / 1 / AtomicFile.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace Microsoft.Tools.ServiceModel.ComSvcConfig { using System; using System.Diagnostics; using System.Configuration; using System.Collections; using System.Collections.Specialized; using System.Collections.Generic; using System.IO; using System.Reflection; using System.Text; using System.Threading; using System.Runtime.InteropServices; using System.Security; using System.ServiceModel; using System.ServiceModel.Configuration; using Microsoft.Tools.ServiceModel; using Microsoft.Tools.ServiceModel.SvcUtil; // Usage // // new AtomicFile // GetCurrent(readOnly)+ // Delete (once), OR GetCurrent(forUpdate)+ // Prepare // Commit or Abort // // Abort may also be called before Prepare class AtomicFile { bool prepared; string originalFileName; bool originalFileExists; string tempFileName; string backupOfOriginalFileName; bool deleteOriginalFile; public string OriginalFileName { get { return this.originalFileName; } } public bool OriginalFileExists { get { return this.originalFileExists; } } public AtomicFile(string fileName) { this.originalFileName = fileName; this.originalFileExists = File.Exists(this.originalFileName); this.tempFileName = null; this.backupOfOriginalFileName = null; this.deleteOriginalFile = false; this.prepared = false; } public bool CurrentExists() { if ((this.tempFileName != null)) { return true; } else { return this.originalFileExists; } } public void Delete() { if (this.tempFileName != null) { // once you make changes, you cant ask for delete (we have no scenario to relax this restriction..) throw new InvalidOperationException(); } if (!this.originalFileExists) { // cant delete if the original file didnt exist throw new InvalidOperationException(); } this.deleteOriginalFile = true; } public string GetCurrentFileName(bool readOnly) { if (this.deleteOriginalFile) { // once you delete, you cant ask for this. throw new InvalidOperationException(); } if (this.tempFileName != null) { return this.tempFileName; } else if (this.originalFileExists) { if (readOnly) { return this.originalFileName; } else { this.tempFileName = GetTempFileName(); File.Copy(this.originalFileName, this.tempFileName); return this.tempFileName; } } else // there is no original file { if (readOnly) { return null; // nothing to read, caller should tolerate this } else { // want to update, have no file yet, create one.. this.tempFileName = GetTempFileName(); return this.tempFileName; } } } // must be called before Preparing public bool HasBeenModified() { return (this.tempFileName != null || (this.originalFileExists && this.deleteOriginalFile)); } public void Prepare() { if (this.tempFileName != null) { if (this.originalFileExists) { this.backupOfOriginalFileName = GetTempFileName(); File.Copy(this.originalFileName, this.backupOfOriginalFileName); SafeDeleteFile(this.originalFileName); } File.Copy(this.tempFileName, this.originalFileName); SafeDeleteFile(this.tempFileName); } else if (this.deleteOriginalFile) { this.backupOfOriginalFileName = GetTempFileName(); File.Copy(this.originalFileName, this.backupOfOriginalFileName); SafeDeleteFile(this.originalFileName); } this.prepared = true; } public void Commit() { if (!this.prepared) { throw new InvalidOperationException(); } SafeDeleteFile(this.backupOfOriginalFileName); } // keep track of whether we had a "clean" prepare / abort, if not clean we shouldnt delete the backups/tempFiles and point the user to them public void Abort() { if (this.originalFileExists) { if ((this.backupOfOriginalFileName != null) && File.Exists(this.backupOfOriginalFileName)) { SafeDeleteFile(this.originalFileName); File.Copy(this.backupOfOriginalFileName, this.originalFileName); } } else { SafeDeleteFile(this.originalFileName); } SafeDeleteFile(this.backupOfOriginalFileName); SafeDeleteFile(this.tempFileName); } // safe as in handles null, and checks for existence first internal static void SafeDeleteFile(string fileName) { if ((!string.IsNullOrEmpty(fileName)) && File.Exists(fileName)) { File.Delete(fileName); } } // this function guarantees to return the name of a temp file that doesnt exist string GetTempFileName() { return Path.Combine(Path.GetTempPath(), Path.GetRandomFileName()); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- CurrencyWrapper.cs
- oledbmetadatacolumnnames.cs
- WebProxyScriptElement.cs
- X509Certificate.cs
- EventRoute.cs
- FontInfo.cs
- BuildProvidersCompiler.cs
- OracleDataAdapter.cs
- Label.cs
- BadImageFormatException.cs
- CallbackDebugBehavior.cs
- WindowsGrip.cs
- SqlMethods.cs
- CacheVirtualItemsEvent.cs
- CryptoHandle.cs
- TargetControlTypeCache.cs
- DispatcherProcessingDisabled.cs
- UriWriter.cs
- SettingsPropertyValueCollection.cs
- Border.cs
- DataBinder.cs
- ConfigurationException.cs
- TypeNameHelper.cs
- StorageRoot.cs
- DPTypeDescriptorContext.cs
- DBSqlParser.cs
- FirewallWrapper.cs
- RawUIStateInputReport.cs
- CompoundFileStorageReference.cs
- mda.cs
- DynamicPropertyHolder.cs
- Imaging.cs
- LocalFileSettingsProvider.cs
- SoapElementAttribute.cs
- ISCIIEncoding.cs
- FixedDocumentPaginator.cs
- Point3DValueSerializer.cs
- MultiSelectRootGridEntry.cs
- HashSetDebugView.cs
- ReadOnlyCollectionBase.cs
- UnknownBitmapEncoder.cs
- HierarchicalDataBoundControlAdapter.cs
- OverrideMode.cs
- CellCreator.cs
- ListViewDeleteEventArgs.cs
- RichTextBox.cs
- DataObjectSettingDataEventArgs.cs
- DynamicQueryStringParameter.cs
- ButtonBaseAdapter.cs
- RijndaelManaged.cs
- TrustManagerMoreInformation.cs
- AcceleratedTokenAuthenticator.cs
- XmlEncoding.cs
- Helper.cs
- DynamicObjectAccessor.cs
- SlotInfo.cs
- TreeView.cs
- _DomainName.cs
- SettingsPropertyValue.cs
- ICspAsymmetricAlgorithm.cs
- ObjectListSelectEventArgs.cs
- FilterEventArgs.cs
- LinkTarget.cs
- ValidatingReaderNodeData.cs
- ToolStripSeparator.cs
- NopReturnReader.cs
- XPathAncestorIterator.cs
- MatrixCamera.cs
- ValidationHelper.cs
- DigestTraceRecordHelper.cs
- VisualTreeHelper.cs
- Transform3DGroup.cs
- XmlBinaryReader.cs
- AxHostDesigner.cs
- ChangeBlockUndoRecord.cs
- Int16AnimationBase.cs
- MsmqInputChannel.cs
- UnhandledExceptionEventArgs.cs
- OleDbPropertySetGuid.cs
- Section.cs
- ConsoleKeyInfo.cs
- BrushConverter.cs
- DescendantBaseQuery.cs
- WindowHideOrCloseTracker.cs
- PolyQuadraticBezierSegment.cs
- ConnectionPoint.cs
- ScalarConstant.cs
- CompModSwitches.cs
- RequestCachingSection.cs
- ItemCheckEvent.cs
- EntityReference.cs
- IOException.cs
- ManifestSignatureInformation.cs
- XPathAncestorQuery.cs
- NamespaceMapping.cs
- StringInfo.cs
- SpAudioStreamWrapper.cs
- XsdValidatingReader.cs
- SpellerInterop.cs
- PropertyCollection.cs