114 lines
3.8 KiB
C#
114 lines
3.8 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="SharedConnectionInfo.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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#region Using directives
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using System;
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using System.Diagnostics;
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using System.Transactions;
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using System.Data.Common;
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using System.Threading;
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#endregion
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namespace System.Workflow.Runtime.Hosting
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{
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/// <summary>
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/// This class keeps the following associated with a Transaction
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/// - a connection that participates in the transaction.
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/// - an optional local transaction (DbTransaction) generated from the single-phase-committed Transaction.
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/// The connection and the local transaction are passed around to different host components to
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/// do transacted DB work using the shared connection.
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/// </summary>
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internal sealed class SharedConnectionInfo : IDisposable
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{
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readonly DbConnection connection;
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readonly DbTransaction localTransaction;
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private bool disposed;
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private ManualResetEvent handle;
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#region Constructor
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/// <summary>
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/// Instantiate an opened connection enlisted to the Transaction
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/// if promotable is false, the Transaction wraps a local
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/// transaction inside and can never be promoted
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/// </summary>
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/// <param name="dbResourceAllocator"></param>
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/// <param name="transaction"></param>
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/// <param name="wantPromotable"></param>
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internal SharedConnectionInfo(
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DbResourceAllocator dbResourceAllocator,
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Transaction transaction,
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bool wantPromotable,
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ManualResetEvent handle)
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{
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Debug.Assert((transaction != null), "Null Transaction!");
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if (null == handle)
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throw new ArgumentNullException("handle");
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this.handle = handle;
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if (wantPromotable)
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{
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// Enlist a newly opened connection to this regular Transaction
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this.connection = dbResourceAllocator.OpenNewConnection();
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this.connection.EnlistTransaction(transaction);
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}
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else
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{
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// Make this transaction no longer promotable by attaching our
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// IPromotableSinglePhaseNotification implementation (LocalTranscaction)
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// and track the DbConnection and DbTransaction associated with the LocalTranscaction
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LocalTransaction localTransaction = new LocalTransaction(dbResourceAllocator, handle);
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transaction.EnlistPromotableSinglePhase(localTransaction);
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this.connection = localTransaction.Connection;
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this.localTransaction = localTransaction.Transaction;
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}
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}
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#endregion Constructor
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#region Accessors
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internal DbConnection DBConnection
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{
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get { return this.connection; }
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}
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internal DbTransaction DBTransaction
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{
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get { return this.localTransaction; }
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}
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#endregion Accessors
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#region IDisposable Members
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public void Dispose()
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{
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Dispose(true);
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GC.SuppressFinalize(this);
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}
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private void Dispose(bool disposing)
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{
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if (!this.disposed)
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{
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//
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// If we're using a LocalTransaction it will close the connection
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// in it's IPromotableSinglePhaseNotification methods
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if ((this.localTransaction == null) && (null != connection))
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this.connection.Dispose();
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}
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this.disposed = true;
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}
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#endregion
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}
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}
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