文件事物管理Transactional File Manager的示例分析

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Project Description

Transactional File Manager is a .NET API that supports including file system operations such as file copy, move, delete, append, etc. in a transaction. It's an implementation of System.Transaction.IEnlistmentNotification (works with System.Transactions.TransactionScope).

This library allows you to wrap file system operations in transactions like this:

// Wrap a file copy and a database insert in the same transactionTxFileManager fileMgr = new TxFileManager();using (TransactionScope scope1 = new TransactionScope()){// Copy a filefileMgr.Copy(srcFileName, destFileName);// Insert a database recorddbMgr.ExecuteNonQuery(insertSql);scope1.Complete();}

Current Features

• Support the following file operations in transactions:

• AppendAllText

• Copy

• CreateDirectory

• DeleteDirectory

• DeleteFile

• Move

• Snapshot

• WriteAllText

• WriteAllBytes

This library supports any file system and is not a wrapper over Transactional NTFS (see AlphaFS).

Examples

// Completely unrealistic example showing how various file operations, including operations done // by library/3rd party code, can participate in transactions.IFileManager fileManager = new TxFileManager();using (TransactionScope scope1 = new TransactionScope()){    fileManager.WriteAllText(inFileName, xml);    // Snapshot allows any file operation to be part of our transaction.    // All we need to know is the file name.    //The statement below tells the TxFileManager to remember the state of this file.    // So even though XslCompiledTransform has no knowledge of our TxFileManager, the file it creates (outFileName)    // will still be restored to this state in the event of a rollback.    fileManager.Snapshot(outFileName);    XslCompiledTransform xsl = new XslCompiledTransform(true);    xsl.Load(uri);    xsl.Transform(inFileName, outFileName);    // write to database 1. This database op will get committed/rolled back along with the file operations we are doing in this transaction.    myDb1.ExecuteNonQuery(sql1);    // write to database 2. The transaction is promoted to a distributed transaction here.    myDb2.ExecuteNonQuery(sql2);    // let's delete some files    for (string fileName in filesToDelete)    {        fileManager.Delete(fileName);    }    // Just for kicks, let's start a new nested  transaction. Since we specify RequiresNew here, this nested transaction    // will be committed/rolled back separately from the main transaction.    // Note that we can still use the same fileManager instance. It knows how to sort things out correctly.    using (TransactionScope scope2 = new TransactionScope(TransactionScopeOptions.RequiresNew))    {        fileManager.MoveFile(anotherFile, anotherFileDest);    }    // move some files    for (string fileName in filesToMove)    {        fileManager.Move(fileName, GetNewFileName(fileName));    }    // Finally, let's create a few temporary files...    // disk space has to be used for something.    // The nice thing about FileManager.GetTempFileName is that    // The temp file will be cleaned up automatically for you when the TransactionScope completes.    // No more worries about temp files that get left behind.    for (int i=0; i<10; i++)    {        fileManager.WriteAllText(fileManager.GetTempFileName(), "testing 1 2");    }    scope1.Complete();    // In the event an exception occurs, everything done here will be rolled back including the output xsl file.}

这是一个开源项目。原始项目网站是 事务文件管理器。

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