WorkflowPersistenceContext.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities / System / Activities / WorkflowPersistenceContext.cs / 1305376 / WorkflowPersistenceContext.cs

                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------

namespace System.Activities 
{
    using System.Collections.Generic; 
    using System.Transactions; 
    using System.Runtime;
 
    class WorkflowPersistenceContext
    {
        CommittableTransaction contextOwnedTransaction;
        Transaction clonedTransaction; 

        public WorkflowPersistenceContext(bool transactionRequired, TimeSpan transactionTimeout) 
            : this(transactionRequired, CloneAmbientTransaction(), transactionTimeout) 
        {
        } 

        public WorkflowPersistenceContext(bool transactionRequired, Transaction transactionToUse, TimeSpan transactionTimeout)
        {
            if (transactionToUse != null) 
            {
                this.clonedTransaction = transactionToUse; 
            } 
            else if (transactionRequired)
            { 
                this.contextOwnedTransaction = new CommittableTransaction(transactionTimeout);
                // Clone it so that we don't pass a CommittableTransaction to the participants
                this.clonedTransaction = this.contextOwnedTransaction.Clone();
            } 
        }
 
        public Transaction PublicTransaction 
        {
            get 
            {
                return this.clonedTransaction;
            }
        } 

        public void Abort() 
        { 
            if (this.contextOwnedTransaction != null)
            { 
                try
                {
                    this.contextOwnedTransaction.Rollback();
                } 
                catch (Exception e)
                { 
                    if (Fx.IsFatal(e)) 
                    {
                        throw; 
                    }

                    // ---- these exceptions as we are already on the error path
                } 
            }
        } 
 
        public void Complete()
        { 
            if (this.contextOwnedTransaction != null)
            {
                this.contextOwnedTransaction.Commit();
            } 
        }
 
        // Returns true if end needs to be called 
        // Note: this is side effecting even if it returns false
        public bool TryBeginComplete(AsyncCallback callback, object state, out IAsyncResult result) 
        {
            // In the interest of allocating less objects we don't implement
            // the full async pattern here.  Instead, we've flattened it to
            // do the [....] part and then optionally delegate down to the inner 
            // BeginCommit.
 
            if (this.contextOwnedTransaction != null) 
            {
                result = this.contextOwnedTransaction.BeginCommit(callback, state); 
                return true;
            }
            else
            { 
                result = null;
                return false; 
            } 
        }
 
        public void EndComplete(IAsyncResult result)
        {
            Fx.Assert(this.contextOwnedTransaction != null, "We must have a contextOwnedTransaction if we are calling End");
 
            this.contextOwnedTransaction.EndCommit(result);
        } 
 
        // We might as well clone the ambient transaction so that PersistenceParticipants
        // can't cast to a CommittableTransaction. 
        static Transaction CloneAmbientTransaction()
        {
            Transaction ambientTransaction = Transaction.Current;
            return ambientTransaction == null ? null : ambientTransaction.Clone(); 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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