Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / Tools / comsvcutil / AtomicFile.cs / 1305376 / 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.
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