文件事物管理TransactionalFileManager的示例分析-创新互联
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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 file
fileMgr.Copy(srcFileName, destFileName);// Insert a database record
dbMgr.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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