VolatileEnlistmentState.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / tx / System / Transactions / VolatileEnlistmentState.cs / 1305376 / VolatileEnlistmentState.cs

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

namespace System.Transactions 
{ 
    using System;
    using System.Diagnostics; 
    using System.Globalization;
    using System.Threading;
    using System.Transactions.Diagnostics;
 
    internal delegate void FinishVolatileDelegate( InternalEnlistment enlistment );
 
    // Base class for all volatile enlistment states 
    internal abstract class VolatileEnlistmentState : EnlistmentState
    { 
        private static VolatileEnlistmentActive        _volatileEnlistmentActive;
        private static VolatileEnlistmentPreparing     _volatileEnlistmentPreparing;
        private static VolatileEnlistmentPrepared      _volatileEnlistmentPrepared;
        private static VolatileEnlistmentSPC           _volatileEnlistmentSPC; 
        private static VolatileEnlistmentPreparingAborting _volatileEnlistmentPreparingAborting;
        private static VolatileEnlistmentAborting      _volatileEnlistmentAborting; 
        private static VolatileEnlistmentCommitting    _volatileEnlistmentCommitting; 
        private static VolatileEnlistmentInDoubt       _volatileEnlistmentInDoubt;
        private static VolatileEnlistmentEnded         _volatileEnlistmentEnded; 
        private static VolatileEnlistmentDone          _volatileEnlistmentDone;

        // Object for synchronizing access to the entire class( avoiding lock( typeof( ... )) )
        private static object classSyncObject; 

        internal  static VolatileEnlistmentActive _VolatileEnlistmentActive 
        { 
            get
            { 
                if (_volatileEnlistmentActive == null)
                {
                    lock (ClassSyncObject)
                    { 
                        if (_volatileEnlistmentActive == null)
                        { 
                            VolatileEnlistmentActive temp = new VolatileEnlistmentActive(); 
                            Thread.MemoryBarrier();
                            _volatileEnlistmentActive = temp; 
                        }
                    }
                }
 
                return _volatileEnlistmentActive;
            } 
        } 

 
        protected static VolatileEnlistmentPreparing _VolatileEnlistmentPreparing
        {
            get
            { 
                if (_volatileEnlistmentPreparing == null)
                { 
                    lock (ClassSyncObject) 
                    {
                        if (_volatileEnlistmentPreparing == null) 
                        {
                            VolatileEnlistmentPreparing temp = new VolatileEnlistmentPreparing();
                            Thread.MemoryBarrier();
                            _volatileEnlistmentPreparing = temp; 
                        }
                    } 
                } 

                return _volatileEnlistmentPreparing; 
            }
        }

 
        protected static VolatileEnlistmentPrepared _VolatileEnlistmentPrepared
        { 
            get 
            {
                if (_volatileEnlistmentPrepared == null) 
                {
                    lock (ClassSyncObject)
                    {
                        if (_volatileEnlistmentPrepared == null) 
                        {
                            VolatileEnlistmentPrepared temp = new VolatileEnlistmentPrepared(); 
                            Thread.MemoryBarrier(); 
                            _volatileEnlistmentPrepared = temp;
                        } 
                    }
                }

                return _volatileEnlistmentPrepared; 
            }
        } 
 

        protected static VolatileEnlistmentSPC _VolatileEnlistmentSPC 
        {
            get
            {
                if (_volatileEnlistmentSPC == null) 
                {
                    lock (ClassSyncObject) 
                    { 
                        if (_volatileEnlistmentSPC == null)
                        { 
                            VolatileEnlistmentSPC temp = new VolatileEnlistmentSPC();
                            Thread.MemoryBarrier();
                            _volatileEnlistmentSPC = temp;
                        } 
                    }
                } 
 
                return _volatileEnlistmentSPC;
            } 
        }


        protected static VolatileEnlistmentPreparingAborting _VolatileEnlistmentPreparingAborting 
        {
            get 
            { 
                if (_volatileEnlistmentPreparingAborting == null)
                { 
                    lock (ClassSyncObject)
                    {
                        if (_volatileEnlistmentPreparingAborting == null)
                        { 
                            VolatileEnlistmentPreparingAborting temp = new VolatileEnlistmentPreparingAborting();
                            Thread.MemoryBarrier(); 
                            _volatileEnlistmentPreparingAborting =  temp; 
                        }
                    } 
                }

                return _volatileEnlistmentPreparingAborting;
            } 
        }
 
 
        protected static VolatileEnlistmentAborting _VolatileEnlistmentAborting
        { 
            get
            {
                if (_volatileEnlistmentAborting == null)
                { 
                    lock (ClassSyncObject)
                    { 
                        if (_volatileEnlistmentAborting == null) 
                        {
                            VolatileEnlistmentAborting temp = new VolatileEnlistmentAborting(); 
                            Thread.MemoryBarrier();
                            _volatileEnlistmentAborting =  temp;
                        }
                    } 
                }
 
                return _volatileEnlistmentAborting; 
            }
        } 


        protected static VolatileEnlistmentCommitting _VolatileEnlistmentCommitting
        { 
            get
            { 
                if (_volatileEnlistmentCommitting == null) 
                {
                    lock (ClassSyncObject) 
                    {
                        if (_volatileEnlistmentCommitting == null)
                        {
                            VolatileEnlistmentCommitting temp = new VolatileEnlistmentCommitting(); 
                            Thread.MemoryBarrier();
                            _volatileEnlistmentCommitting =  temp; 
                        } 
                    }
                } 

                return _volatileEnlistmentCommitting;
            }
        } 

        protected static VolatileEnlistmentInDoubt _VolatileEnlistmentInDoubt 
        { 
            get
            { 
                if (_volatileEnlistmentInDoubt == null)
                {
                    lock (ClassSyncObject)
                    { 
                        if (_volatileEnlistmentInDoubt == null)
                        { 
                            VolatileEnlistmentInDoubt temp = new VolatileEnlistmentInDoubt(); 
                            Thread.MemoryBarrier();
                            _volatileEnlistmentInDoubt =  temp; 
                        }
                    }
                }
 
                return _volatileEnlistmentInDoubt;
            } 
        } 

 
        protected static VolatileEnlistmentEnded _VolatileEnlistmentEnded
        {
            get
            { 
                if (_volatileEnlistmentEnded == null)
                { 
                    lock (ClassSyncObject) 
                    {
                        if (_volatileEnlistmentEnded == null) 
                        {
                            VolatileEnlistmentEnded temp = new VolatileEnlistmentEnded();
                            Thread.MemoryBarrier();
                            _volatileEnlistmentEnded =  temp; 
                        }
                    } 
                } 

                return _volatileEnlistmentEnded; 
            }
        }

 
        protected static VolatileEnlistmentDone _VolatileEnlistmentDone
        { 
            get 
            {
                if (_volatileEnlistmentDone == null) 
                {
                    lock (ClassSyncObject)
                    {
                        if (_volatileEnlistmentDone == null) 
                        {
                            VolatileEnlistmentDone temp = new VolatileEnlistmentDone(); 
                            Thread.MemoryBarrier(); 
                            _volatileEnlistmentDone = temp;
                        } 
                    }
                }

                return _volatileEnlistmentDone; 
            }
        } 
 

 
        // Helper object for static synchronization
        private static object ClassSyncObject
        {
            get 
            {
                if( classSyncObject == null ) 
                { 
                    object o = new object();
                    Interlocked.CompareExchange( ref classSyncObject, o, null ); 
                }
                return classSyncObject;
            }
        } 

        // Override of get_RecoveryInformation to be more specific with the exception string. 
        internal override byte[] RecoveryInformation(InternalEnlistment enlistment) 
        {
            throw TransactionException.CreateInvalidOperationException( SR.GetString( SR.TraceSourceLtm ), 
                SR.GetString( SR.VolEnlistNoRecoveryInfo), null );
        }

    } 

 
 
    // Active state for a volatile enlistment indicates that the enlistment has been created
    // but no one has begun committing or aborting the transaction.  From this state the enlistment 
    // can abort the transaction or call read only to indicate that it does not want to
    // participate further in the transaction.
    internal class VolatileEnlistmentActive : VolatileEnlistmentState
    { 
        internal override void EnterState( InternalEnlistment enlistment )
        { 
            // Set the enlistment state 
            enlistment.State = this;
 
            // Yeah it's active.
        }

 
        #region IEnlistment Related Events
 
        internal override void EnlistmentDone( InternalEnlistment enlistment ) 
        {
            // End this enlistment 
            _VolatileEnlistmentDone.EnterState( enlistment );

            // Note another enlistment finished.
            enlistment.FinishEnlistment(); 
        }
 
        #endregion 

 
        #region State Change Events

        internal override void ChangeStatePreparing( InternalEnlistment enlistment )
        { 
            _VolatileEnlistmentPreparing.EnterState( enlistment );
        } 
 

        internal override void ChangeStateSinglePhaseCommit( InternalEnlistment enlistment ) 
        {
            _VolatileEnlistmentSPC.EnterState( enlistment );
        }
 

        #endregion 
 

        #region Internal Events 

        internal override void InternalAborted(InternalEnlistment enlistment)
        {
            // Change the enlistment state to aborting. 
            _VolatileEnlistmentAborting.EnterState( enlistment );
        } 
 
        #endregion
    } 



    // Preparing state is the time after prepare has been called but no response has been received. 
    internal class VolatileEnlistmentPreparing : VolatileEnlistmentState
    { 
        internal override void EnterState( InternalEnlistment enlistment ) 
        {
            // Set the enlistment state 
            enlistment.State = this;

            Monitor.Exit( enlistment.Transaction );
            try // Don't hold this lock while calling into the application code. 
            {
                if ( DiagnosticTrace.Verbose ) 
                { 
                    EnlistmentNotificationCallTraceRecord.Trace( SR.GetString( SR.TraceSourceLtm ),
                        enlistment.EnlistmentTraceId, 
                        NotificationCall.Prepare
                        );
                }
 
                enlistment.EnlistmentNotification.Prepare( enlistment.PreparingEnlistment );
            } 
            finally 
            {
#pragma warning disable 0618 
                //@
                Monitor.Enter(enlistment.Transaction);
#pragma warning restore 0618
            } 
        }
 
 
        internal override void EnlistmentDone( InternalEnlistment enlistment )
        { 
            _VolatileEnlistmentDone.EnterState( enlistment );

            // Process Finished InternalEnlistment
            enlistment.FinishEnlistment(); 
        }
 
 
        internal override void Prepared( InternalEnlistment enlistment )
        { 
            // Change the enlistments state to prepared.
            _VolatileEnlistmentPrepared.EnterState( enlistment );

            // Process Finished InternalEnlistment 
            enlistment.FinishEnlistment();
        } 
 

        // The enlistment says to abort start the abort sequence. 
        internal override void ForceRollback( InternalEnlistment enlistment, Exception e )
        {
            // Change enlistment state to aborting
            _VolatileEnlistmentEnded.EnterState( enlistment ); 

            // Start the transaction aborting 
            enlistment.Transaction.State.ChangeStateTransactionAborted( enlistment.Transaction, e ); 

            // Process Finished InternalEnlistment 
            enlistment.FinishEnlistment();
        }

 
        internal override void ChangeStatePreparing( InternalEnlistment enlistment )
        { 
            // If the transaction promotes during phase 0 then the transition to 
            // the promoted phase 0 state for the transaction may cause this
            // notification to be delivered again.  So in this case it should be 
            // ignored.
        }

 
        internal override void InternalAborted( InternalEnlistment enlistment )
        { 
            _VolatileEnlistmentPreparingAborting.EnterState( enlistment ); 
        }
    } 



    // SPC state for a volatile enlistment is the point at which there is exactly 1 enlisment 
    // and it supports SPC.  The TM will send a single phase commit to the enlistment and wait
    // for the response from the TM. 
    internal class VolatileEnlistmentSPC : VolatileEnlistmentState 
    {
        internal override void EnterState( InternalEnlistment enlistment ) 
        {
            bool spcCommitted = false;
            // Set the enlistment state
            enlistment.State = this; 

            // Send Single Phase Commit to the enlistment 
            if ( DiagnosticTrace.Verbose ) 
            {
                EnlistmentNotificationCallTraceRecord.Trace( SR.GetString( SR.TraceSourceLtm ), 
                    enlistment.EnlistmentTraceId,
                    NotificationCall.SinglePhaseCommit
                    );
            } 

            Monitor.Exit( enlistment.Transaction ); 
            try // Don't hold this lock while calling into the application code. 
            {
                enlistment.SinglePhaseNotification.SinglePhaseCommit( enlistment.SinglePhaseEnlistment ); 
                spcCommitted = true;
            }
            finally
            { 
                if (!spcCommitted)
                { 
                    //If we have an exception thrown in SPC, we don't know the if the enlistment is committed or not 
                    //reply indoubt
                    enlistment.SinglePhaseEnlistment.InDoubt(); 
                }
#pragma warning disable 0618
                //@
                Monitor.Enter(enlistment.Transaction); 
#pragma warning restore 0618
            } 
        } 

 
        internal override void EnlistmentDone( InternalEnlistment enlistment )
        {
            _VolatileEnlistmentEnded.EnterState( enlistment );
            enlistment.Transaction.State.ChangeStateTransactionCommitted( enlistment.Transaction ); 
        }
 
 
        internal override void Committed( InternalEnlistment enlistment )
        { 
            _VolatileEnlistmentEnded.EnterState( enlistment );
            enlistment.Transaction.State.ChangeStateTransactionCommitted( enlistment.Transaction );
        }
 

        internal override void Aborted( InternalEnlistment enlistment, Exception e ) 
        { 
            _VolatileEnlistmentEnded.EnterState( enlistment );
 
            enlistment.Transaction.State.ChangeStateTransactionAborted( enlistment.Transaction, e );
        }

 
        internal override void InDoubt( InternalEnlistment enlistment, Exception e )
        { 
            _VolatileEnlistmentEnded.EnterState( enlistment ); 

            if( enlistment.Transaction.innerException == null ) 
            {
                enlistment.Transaction.innerException = e;
            }
 
            enlistment.Transaction.State.InDoubtFromEnlistment( enlistment.Transaction );
        } 
 
    }
 

    // Prepared state for a volatile enlistment is the point at which prepare has been called
    // and the enlistment has responded prepared.  No enlistment operations are valid at this
    // point.  The RM must wait for the TM to take the next action. 
    internal class VolatileEnlistmentPrepared : VolatileEnlistmentState
    { 
        internal override void EnterState( InternalEnlistment enlistment ) 
        {
            // Set the enlistment state 
            enlistment.State = this;

            // Wait for Committed
        } 

 
        internal override void InternalAborted(InternalEnlistment enlistment) 
        {
            _VolatileEnlistmentAborting.EnterState( enlistment ); 
        }


        internal override void InternalCommitted( InternalEnlistment enlistment ) 
        {
            _VolatileEnlistmentCommitting.EnterState( enlistment ); 
        } 

 
        internal override void InternalIndoubt( InternalEnlistment enlistment )
        {
            // Change the enlistment state to InDoubt.
            _VolatileEnlistmentInDoubt.EnterState( enlistment ); 
        }
 
        internal override void ChangeStatePreparing( InternalEnlistment enlistment ) 
        {
            // This would happen in the second pass of a phase 0 wave. 
        }
    }

 

    // Aborting state is when Rollback has been sent to the enlistment. 
    internal class VolatileEnlistmentPreparingAborting : VolatileEnlistmentState 
    {
        internal override void EnterState( InternalEnlistment enlistment ) 
        {
            // Set the enlistment state
            enlistment.State = this;
        } 

 
        internal override void EnlistmentDone( InternalEnlistment enlistment ) 
        {
            // Move this enlistment to the ended state 
            _VolatileEnlistmentEnded.EnterState( enlistment );
        }

 
        internal override void Prepared( InternalEnlistment enlistment )
        { 
            // The enlistment has respondend so changes it's state to aborting. 
            _VolatileEnlistmentAborting.EnterState( enlistment );
 
            // Process Finished InternalEnlistment
            enlistment.FinishEnlistment();
        }
 

        // The enlistment says to abort start the abort sequence. 
        internal override void ForceRollback( InternalEnlistment enlistment, Exception e ) 
        {
            // Change enlistment state to aborting 
            _VolatileEnlistmentEnded.EnterState( enlistment );

            // Record the exception in the transaction
            if( enlistment.Transaction.innerException == null ) 
            {
                // Arguably this is the second call to ForceRollback and not the call that 
                // aborted the transaction but just in case. 
                enlistment.Transaction.innerException = e;
            } 

            // Process Finished InternalEnlistment
            enlistment.FinishEnlistment();
        } 

 
        internal override void InternalAborted( InternalEnlistment enlistment ) 
        {
            // If this event comes from multiple places just ignore it.  Continue 
            // waiting for the enlistment to respond so that we can respond to it.
        }
    }
 

 
    // Aborting state is when Rollback has been sent to the enlistment. 
    internal class VolatileEnlistmentAborting : VolatileEnlistmentState
    { 
        internal override void EnterState( InternalEnlistment enlistment )
        {
            // Set the enlistment state
            enlistment.State = this; 

            Monitor.Exit( enlistment.Transaction ); 
            try // Don't hold this lock while calling into the application code. 
            {
                if ( DiagnosticTrace.Verbose ) 
                {
                    EnlistmentNotificationCallTraceRecord.Trace( SR.GetString( SR.TraceSourceLtm ),
                        enlistment.EnlistmentTraceId,
                        NotificationCall.Rollback 
                        );
                } 
 
                enlistment.EnlistmentNotification.Rollback( enlistment.SinglePhaseEnlistment );
            } 
            finally
            {
#pragma warning disable 0618
                //@ 
                Monitor.Enter(enlistment.Transaction);
#pragma warning restore 0618 
            } 
        }
 

        internal override void ChangeStatePreparing( InternalEnlistment enlistment )
        {
            // This enlistment was told to abort before being told to prepare 
        }
 
 
        internal override void EnlistmentDone( InternalEnlistment enlistment )
        { 
            // Move this enlistment to the ended state
            _VolatileEnlistmentEnded.EnterState( enlistment );
        }
 
        internal override void InternalAborted( InternalEnlistment enlistment )
        { 
            // Already working on it. 
        }
    } 



    // Committing state is when Commit has been sent to the enlistment. 
    internal class VolatileEnlistmentCommitting : VolatileEnlistmentState
    { 
        internal override void EnterState( InternalEnlistment enlistment ) 
        {
            // Set the enlistment state 
            enlistment.State = this;

            Monitor.Exit( enlistment.Transaction );
            try // Don't hold this lock while calling into the application code. 
            {
                if ( DiagnosticTrace.Verbose ) 
                { 
                    EnlistmentNotificationCallTraceRecord.Trace( SR.GetString( SR.TraceSourceLtm ),
                        enlistment.EnlistmentTraceId, 
                        NotificationCall.Commit
                        );
                }
 
                // Forward the notification to the enlistment
                enlistment.EnlistmentNotification.Commit( enlistment.Enlistment ); 
            } 
            finally
            { 
#pragma warning disable 0618
                //@
                Monitor.Enter(enlistment.Transaction);
#pragma warning restore 0618 
            }
        } 
 

        internal override void EnlistmentDone( InternalEnlistment enlistment ) 
        {
            // Move this enlistment to the ended state
            _VolatileEnlistmentEnded.EnterState( enlistment );
        } 
    }
 
 
    // InDoubt state is for an enlistment that has sent indoubt but has not been responeded to.
    internal class VolatileEnlistmentInDoubt : VolatileEnlistmentState 
    {
        internal override void EnterState( InternalEnlistment enlistment )
        {
            // Set the enlistment state 
            enlistment.State = this;
 
            Monitor.Exit( enlistment.Transaction ); 
            try // Don't hold this lock while calling into the application code.
            { 
                if ( DiagnosticTrace.Verbose )
                {
                    EnlistmentNotificationCallTraceRecord.Trace( SR.GetString( SR.TraceSourceLtm ),
                        enlistment.EnlistmentTraceId, 
                        NotificationCall.InDoubt
                        ); 
                } 

                // Forward the notification to the enlistment 
                enlistment.EnlistmentNotification.InDoubt( enlistment.PreparingEnlistment );
            }
            finally
            { 
#pragma warning disable 0618
                //@ 
                Monitor.Enter(enlistment.Transaction); 
#pragma warning restore 0618
            } 
        }


        internal override void EnlistmentDone( InternalEnlistment enlistment ) 
        {
            // Move this enlistment to the ended state 
            _VolatileEnlistmentEnded.EnterState( enlistment ); 
        }
    } 


    // Ended state is the state that is entered when the transaction has committed,
    // aborted, or said read only for an enlistment.  At this point there are no valid 
    // operations on the enlistment.
    internal class VolatileEnlistmentEnded : VolatileEnlistmentState 
    { 
        internal override void EnterState( InternalEnlistment enlistment )
        { 
            // Set the enlistment state
            enlistment.State = this;

            // Nothing to do. 
        }
 
 
        internal override void ChangeStatePreparing( InternalEnlistment enlistment )
        { 
            // This enlistment was told to abort before being told to prepare
        }

 
        internal override void InternalAborted( InternalEnlistment enlistment )
        { 
            // Ignore this in case the enlistment gets here before 
            // the transaction tells it to do so
        } 


        internal override void InternalCommitted( InternalEnlistment enlistment )
        { 
            // Ignore this in case the enlistment gets here before
            // the transaction tells it to do so 
        } 

 
        internal override void InternalIndoubt(InternalEnlistment enlistment)
        {
            // Ignore this in case the enlistment gets here before
            // the transaction tells it to do so 
        }
 
        internal override void InDoubt(InternalEnlistment enlistment, Exception e) 
        {
            // Ignore this in case the enlistment gets here before 
            // the transaction tells it to do so
        }
    }
 

    // At some point either early or late the enlistment responded ReadOnly 
    internal class VolatileEnlistmentDone : VolatileEnlistmentEnded 
    {
        internal override void EnterState( InternalEnlistment enlistment ) 
        {
            // Set the enlistment state
            enlistment.State = this;
 
            // Nothing to do.
        } 
 

        internal override void ChangeStatePreparing( InternalEnlistment enlistment ) 
        {
            enlistment.CheckComplete();
        }
    } 
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Transactions 
{ 
    using System;
    using System.Diagnostics; 
    using System.Globalization;
    using System.Threading;
    using System.Transactions.Diagnostics;
 
    internal delegate void FinishVolatileDelegate( InternalEnlistment enlistment );
 
    // Base class for all volatile enlistment states 
    internal abstract class VolatileEnlistmentState : EnlistmentState
    { 
        private static VolatileEnlistmentActive        _volatileEnlistmentActive;
        private static VolatileEnlistmentPreparing     _volatileEnlistmentPreparing;
        private static VolatileEnlistmentPrepared      _volatileEnlistmentPrepared;
        private static VolatileEnlistmentSPC           _volatileEnlistmentSPC; 
        private static VolatileEnlistmentPreparingAborting _volatileEnlistmentPreparingAborting;
        private static VolatileEnlistmentAborting      _volatileEnlistmentAborting; 
        private static VolatileEnlistmentCommitting    _volatileEnlistmentCommitting; 
        private static VolatileEnlistmentInDoubt       _volatileEnlistmentInDoubt;
        private static VolatileEnlistmentEnded         _volatileEnlistmentEnded; 
        private static VolatileEnlistmentDone          _volatileEnlistmentDone;

        // Object for synchronizing access to the entire class( avoiding lock( typeof( ... )) )
        private static object classSyncObject; 

        internal  static VolatileEnlistmentActive _VolatileEnlistmentActive 
        { 
            get
            { 
                if (_volatileEnlistmentActive == null)
                {
                    lock (ClassSyncObject)
                    { 
                        if (_volatileEnlistmentActive == null)
                        { 
                            VolatileEnlistmentActive temp = new VolatileEnlistmentActive(); 
                            Thread.MemoryBarrier();
                            _volatileEnlistmentActive = temp; 
                        }
                    }
                }
 
                return _volatileEnlistmentActive;
            } 
        } 

 
        protected static VolatileEnlistmentPreparing _VolatileEnlistmentPreparing
        {
            get
            { 
                if (_volatileEnlistmentPreparing == null)
                { 
                    lock (ClassSyncObject) 
                    {
                        if (_volatileEnlistmentPreparing == null) 
                        {
                            VolatileEnlistmentPreparing temp = new VolatileEnlistmentPreparing();
                            Thread.MemoryBarrier();
                            _volatileEnlistmentPreparing = temp; 
                        }
                    } 
                } 

                return _volatileEnlistmentPreparing; 
            }
        }

 
        protected static VolatileEnlistmentPrepared _VolatileEnlistmentPrepared
        { 
            get 
            {
                if (_volatileEnlistmentPrepared == null) 
                {
                    lock (ClassSyncObject)
                    {
                        if (_volatileEnlistmentPrepared == null) 
                        {
                            VolatileEnlistmentPrepared temp = new VolatileEnlistmentPrepared(); 
                            Thread.MemoryBarrier(); 
                            _volatileEnlistmentPrepared = temp;
                        } 
                    }
                }

                return _volatileEnlistmentPrepared; 
            }
        } 
 

        protected static VolatileEnlistmentSPC _VolatileEnlistmentSPC 
        {
            get
            {
                if (_volatileEnlistmentSPC == null) 
                {
                    lock (ClassSyncObject) 
                    { 
                        if (_volatileEnlistmentSPC == null)
                        { 
                            VolatileEnlistmentSPC temp = new VolatileEnlistmentSPC();
                            Thread.MemoryBarrier();
                            _volatileEnlistmentSPC = temp;
                        } 
                    }
                } 
 
                return _volatileEnlistmentSPC;
            } 
        }


        protected static VolatileEnlistmentPreparingAborting _VolatileEnlistmentPreparingAborting 
        {
            get 
            { 
                if (_volatileEnlistmentPreparingAborting == null)
                { 
                    lock (ClassSyncObject)
                    {
                        if (_volatileEnlistmentPreparingAborting == null)
                        { 
                            VolatileEnlistmentPreparingAborting temp = new VolatileEnlistmentPreparingAborting();
                            Thread.MemoryBarrier(); 
                            _volatileEnlistmentPreparingAborting =  temp; 
                        }
                    } 
                }

                return _volatileEnlistmentPreparingAborting;
            } 
        }
 
 
        protected static VolatileEnlistmentAborting _VolatileEnlistmentAborting
        { 
            get
            {
                if (_volatileEnlistmentAborting == null)
                { 
                    lock (ClassSyncObject)
                    { 
                        if (_volatileEnlistmentAborting == null) 
                        {
                            VolatileEnlistmentAborting temp = new VolatileEnlistmentAborting(); 
                            Thread.MemoryBarrier();
                            _volatileEnlistmentAborting =  temp;
                        }
                    } 
                }
 
                return _volatileEnlistmentAborting; 
            }
        } 


        protected static VolatileEnlistmentCommitting _VolatileEnlistmentCommitting
        { 
            get
            { 
                if (_volatileEnlistmentCommitting == null) 
                {
                    lock (ClassSyncObject) 
                    {
                        if (_volatileEnlistmentCommitting == null)
                        {
                            VolatileEnlistmentCommitting temp = new VolatileEnlistmentCommitting(); 
                            Thread.MemoryBarrier();
                            _volatileEnlistmentCommitting =  temp; 
                        } 
                    }
                } 

                return _volatileEnlistmentCommitting;
            }
        } 

        protected static VolatileEnlistmentInDoubt _VolatileEnlistmentInDoubt 
        { 
            get
            { 
                if (_volatileEnlistmentInDoubt == null)
                {
                    lock (ClassSyncObject)
                    { 
                        if (_volatileEnlistmentInDoubt == null)
                        { 
                            VolatileEnlistmentInDoubt temp = new VolatileEnlistmentInDoubt(); 
                            Thread.MemoryBarrier();
                            _volatileEnlistmentInDoubt =  temp; 
                        }
                    }
                }
 
                return _volatileEnlistmentInDoubt;
            } 
        } 

 
        protected static VolatileEnlistmentEnded _VolatileEnlistmentEnded
        {
            get
            { 
                if (_volatileEnlistmentEnded == null)
                { 
                    lock (ClassSyncObject) 
                    {
                        if (_volatileEnlistmentEnded == null) 
                        {
                            VolatileEnlistmentEnded temp = new VolatileEnlistmentEnded();
                            Thread.MemoryBarrier();
                            _volatileEnlistmentEnded =  temp; 
                        }
                    } 
                } 

                return _volatileEnlistmentEnded; 
            }
        }

 
        protected static VolatileEnlistmentDone _VolatileEnlistmentDone
        { 
            get 
            {
                if (_volatileEnlistmentDone == null) 
                {
                    lock (ClassSyncObject)
                    {
                        if (_volatileEnlistmentDone == null) 
                        {
                            VolatileEnlistmentDone temp = new VolatileEnlistmentDone(); 
                            Thread.MemoryBarrier(); 
                            _volatileEnlistmentDone = temp;
                        } 
                    }
                }

                return _volatileEnlistmentDone; 
            }
        } 
 

 
        // Helper object for static synchronization
        private static object ClassSyncObject
        {
            get 
            {
                if( classSyncObject == null ) 
                { 
                    object o = new object();
                    Interlocked.CompareExchange( ref classSyncObject, o, null ); 
                }
                return classSyncObject;
            }
        } 

        // Override of get_RecoveryInformation to be more specific with the exception string. 
        internal override byte[] RecoveryInformation(InternalEnlistment enlistment) 
        {
            throw TransactionException.CreateInvalidOperationException( SR.GetString( SR.TraceSourceLtm ), 
                SR.GetString( SR.VolEnlistNoRecoveryInfo), null );
        }

    } 

 
 
    // Active state for a volatile enlistment indicates that the enlistment has been created
    // but no one has begun committing or aborting the transaction.  From this state the enlistment 
    // can abort the transaction or call read only to indicate that it does not want to
    // participate further in the transaction.
    internal class VolatileEnlistmentActive : VolatileEnlistmentState
    { 
        internal override void EnterState( InternalEnlistment enlistment )
        { 
            // Set the enlistment state 
            enlistment.State = this;
 
            // Yeah it's active.
        }

 
        #region IEnlistment Related Events
 
        internal override void EnlistmentDone( InternalEnlistment enlistment ) 
        {
            // End this enlistment 
            _VolatileEnlistmentDone.EnterState( enlistment );

            // Note another enlistment finished.
            enlistment.FinishEnlistment(); 
        }
 
        #endregion 

 
        #region State Change Events

        internal override void ChangeStatePreparing( InternalEnlistment enlistment )
        { 
            _VolatileEnlistmentPreparing.EnterState( enlistment );
        } 
 

        internal override void ChangeStateSinglePhaseCommit( InternalEnlistment enlistment ) 
        {
            _VolatileEnlistmentSPC.EnterState( enlistment );
        }
 

        #endregion 
 

        #region Internal Events 

        internal override void InternalAborted(InternalEnlistment enlistment)
        {
            // Change the enlistment state to aborting. 
            _VolatileEnlistmentAborting.EnterState( enlistment );
        } 
 
        #endregion
    } 



    // Preparing state is the time after prepare has been called but no response has been received. 
    internal class VolatileEnlistmentPreparing : VolatileEnlistmentState
    { 
        internal override void EnterState( InternalEnlistment enlistment ) 
        {
            // Set the enlistment state 
            enlistment.State = this;

            Monitor.Exit( enlistment.Transaction );
            try // Don't hold this lock while calling into the application code. 
            {
                if ( DiagnosticTrace.Verbose ) 
                { 
                    EnlistmentNotificationCallTraceRecord.Trace( SR.GetString( SR.TraceSourceLtm ),
                        enlistment.EnlistmentTraceId, 
                        NotificationCall.Prepare
                        );
                }
 
                enlistment.EnlistmentNotification.Prepare( enlistment.PreparingEnlistment );
            } 
            finally 
            {
#pragma warning disable 0618 
                //@
                Monitor.Enter(enlistment.Transaction);
#pragma warning restore 0618
            } 
        }
 
 
        internal override void EnlistmentDone( InternalEnlistment enlistment )
        { 
            _VolatileEnlistmentDone.EnterState( enlistment );

            // Process Finished InternalEnlistment
            enlistment.FinishEnlistment(); 
        }
 
 
        internal override void Prepared( InternalEnlistment enlistment )
        { 
            // Change the enlistments state to prepared.
            _VolatileEnlistmentPrepared.EnterState( enlistment );

            // Process Finished InternalEnlistment 
            enlistment.FinishEnlistment();
        } 
 

        // The enlistment says to abort start the abort sequence. 
        internal override void ForceRollback( InternalEnlistment enlistment, Exception e )
        {
            // Change enlistment state to aborting
            _VolatileEnlistmentEnded.EnterState( enlistment ); 

            // Start the transaction aborting 
            enlistment.Transaction.State.ChangeStateTransactionAborted( enlistment.Transaction, e ); 

            // Process Finished InternalEnlistment 
            enlistment.FinishEnlistment();
        }

 
        internal override void ChangeStatePreparing( InternalEnlistment enlistment )
        { 
            // If the transaction promotes during phase 0 then the transition to 
            // the promoted phase 0 state for the transaction may cause this
            // notification to be delivered again.  So in this case it should be 
            // ignored.
        }

 
        internal override void InternalAborted( InternalEnlistment enlistment )
        { 
            _VolatileEnlistmentPreparingAborting.EnterState( enlistment ); 
        }
    } 



    // SPC state for a volatile enlistment is the point at which there is exactly 1 enlisment 
    // and it supports SPC.  The TM will send a single phase commit to the enlistment and wait
    // for the response from the TM. 
    internal class VolatileEnlistmentSPC : VolatileEnlistmentState 
    {
        internal override void EnterState( InternalEnlistment enlistment ) 
        {
            bool spcCommitted = false;
            // Set the enlistment state
            enlistment.State = this; 

            // Send Single Phase Commit to the enlistment 
            if ( DiagnosticTrace.Verbose ) 
            {
                EnlistmentNotificationCallTraceRecord.Trace( SR.GetString( SR.TraceSourceLtm ), 
                    enlistment.EnlistmentTraceId,
                    NotificationCall.SinglePhaseCommit
                    );
            } 

            Monitor.Exit( enlistment.Transaction ); 
            try // Don't hold this lock while calling into the application code. 
            {
                enlistment.SinglePhaseNotification.SinglePhaseCommit( enlistment.SinglePhaseEnlistment ); 
                spcCommitted = true;
            }
            finally
            { 
                if (!spcCommitted)
                { 
                    //If we have an exception thrown in SPC, we don't know the if the enlistment is committed or not 
                    //reply indoubt
                    enlistment.SinglePhaseEnlistment.InDoubt(); 
                }
#pragma warning disable 0618
                //@
                Monitor.Enter(enlistment.Transaction); 
#pragma warning restore 0618
            } 
        } 

 
        internal override void EnlistmentDone( InternalEnlistment enlistment )
        {
            _VolatileEnlistmentEnded.EnterState( enlistment );
            enlistment.Transaction.State.ChangeStateTransactionCommitted( enlistment.Transaction ); 
        }
 
 
        internal override void Committed( InternalEnlistment enlistment )
        { 
            _VolatileEnlistmentEnded.EnterState( enlistment );
            enlistment.Transaction.State.ChangeStateTransactionCommitted( enlistment.Transaction );
        }
 

        internal override void Aborted( InternalEnlistment enlistment, Exception e ) 
        { 
            _VolatileEnlistmentEnded.EnterState( enlistment );
 
            enlistment.Transaction.State.ChangeStateTransactionAborted( enlistment.Transaction, e );
        }

 
        internal override void InDoubt( InternalEnlistment enlistment, Exception e )
        { 
            _VolatileEnlistmentEnded.EnterState( enlistment ); 

            if( enlistment.Transaction.innerException == null ) 
            {
                enlistment.Transaction.innerException = e;
            }
 
            enlistment.Transaction.State.InDoubtFromEnlistment( enlistment.Transaction );
        } 
 
    }
 

    // Prepared state for a volatile enlistment is the point at which prepare has been called
    // and the enlistment has responded prepared.  No enlistment operations are valid at this
    // point.  The RM must wait for the TM to take the next action. 
    internal class VolatileEnlistmentPrepared : VolatileEnlistmentState
    { 
        internal override void EnterState( InternalEnlistment enlistment ) 
        {
            // Set the enlistment state 
            enlistment.State = this;

            // Wait for Committed
        } 

 
        internal override void InternalAborted(InternalEnlistment enlistment) 
        {
            _VolatileEnlistmentAborting.EnterState( enlistment ); 
        }


        internal override void InternalCommitted( InternalEnlistment enlistment ) 
        {
            _VolatileEnlistmentCommitting.EnterState( enlistment ); 
        } 

 
        internal override void InternalIndoubt( InternalEnlistment enlistment )
        {
            // Change the enlistment state to InDoubt.
            _VolatileEnlistmentInDoubt.EnterState( enlistment ); 
        }
 
        internal override void ChangeStatePreparing( InternalEnlistment enlistment ) 
        {
            // This would happen in the second pass of a phase 0 wave. 
        }
    }

 

    // Aborting state is when Rollback has been sent to the enlistment. 
    internal class VolatileEnlistmentPreparingAborting : VolatileEnlistmentState 
    {
        internal override void EnterState( InternalEnlistment enlistment ) 
        {
            // Set the enlistment state
            enlistment.State = this;
        } 

 
        internal override void EnlistmentDone( InternalEnlistment enlistment ) 
        {
            // Move this enlistment to the ended state 
            _VolatileEnlistmentEnded.EnterState( enlistment );
        }

 
        internal override void Prepared( InternalEnlistment enlistment )
        { 
            // The enlistment has respondend so changes it's state to aborting. 
            _VolatileEnlistmentAborting.EnterState( enlistment );
 
            // Process Finished InternalEnlistment
            enlistment.FinishEnlistment();
        }
 

        // The enlistment says to abort start the abort sequence. 
        internal override void ForceRollback( InternalEnlistment enlistment, Exception e ) 
        {
            // Change enlistment state to aborting 
            _VolatileEnlistmentEnded.EnterState( enlistment );

            // Record the exception in the transaction
            if( enlistment.Transaction.innerException == null ) 
            {
                // Arguably this is the second call to ForceRollback and not the call that 
                // aborted the transaction but just in case. 
                enlistment.Transaction.innerException = e;
            } 

            // Process Finished InternalEnlistment
            enlistment.FinishEnlistment();
        } 

 
        internal override void InternalAborted( InternalEnlistment enlistment ) 
        {
            // If this event comes from multiple places just ignore it.  Continue 
            // waiting for the enlistment to respond so that we can respond to it.
        }
    }
 

 
    // Aborting state is when Rollback has been sent to the enlistment. 
    internal class VolatileEnlistmentAborting : VolatileEnlistmentState
    { 
        internal override void EnterState( InternalEnlistment enlistment )
        {
            // Set the enlistment state
            enlistment.State = this; 

            Monitor.Exit( enlistment.Transaction ); 
            try // Don't hold this lock while calling into the application code. 
            {
                if ( DiagnosticTrace.Verbose ) 
                {
                    EnlistmentNotificationCallTraceRecord.Trace( SR.GetString( SR.TraceSourceLtm ),
                        enlistment.EnlistmentTraceId,
                        NotificationCall.Rollback 
                        );
                } 
 
                enlistment.EnlistmentNotification.Rollback( enlistment.SinglePhaseEnlistment );
            } 
            finally
            {
#pragma warning disable 0618
                //@ 
                Monitor.Enter(enlistment.Transaction);
#pragma warning restore 0618 
            } 
        }
 

        internal override void ChangeStatePreparing( InternalEnlistment enlistment )
        {
            // This enlistment was told to abort before being told to prepare 
        }
 
 
        internal override void EnlistmentDone( InternalEnlistment enlistment )
        { 
            // Move this enlistment to the ended state
            _VolatileEnlistmentEnded.EnterState( enlistment );
        }
 
        internal override void InternalAborted( InternalEnlistment enlistment )
        { 
            // Already working on it. 
        }
    } 



    // Committing state is when Commit has been sent to the enlistment. 
    internal class VolatileEnlistmentCommitting : VolatileEnlistmentState
    { 
        internal override void EnterState( InternalEnlistment enlistment ) 
        {
            // Set the enlistment state 
            enlistment.State = this;

            Monitor.Exit( enlistment.Transaction );
            try // Don't hold this lock while calling into the application code. 
            {
                if ( DiagnosticTrace.Verbose ) 
                { 
                    EnlistmentNotificationCallTraceRecord.Trace( SR.GetString( SR.TraceSourceLtm ),
                        enlistment.EnlistmentTraceId, 
                        NotificationCall.Commit
                        );
                }
 
                // Forward the notification to the enlistment
                enlistment.EnlistmentNotification.Commit( enlistment.Enlistment ); 
            } 
            finally
            { 
#pragma warning disable 0618
                //@
                Monitor.Enter(enlistment.Transaction);
#pragma warning restore 0618 
            }
        } 
 

        internal override void EnlistmentDone( InternalEnlistment enlistment ) 
        {
            // Move this enlistment to the ended state
            _VolatileEnlistmentEnded.EnterState( enlistment );
        } 
    }
 
 
    // InDoubt state is for an enlistment that has sent indoubt but has not been responeded to.
    internal class VolatileEnlistmentInDoubt : VolatileEnlistmentState 
    {
        internal override void EnterState( InternalEnlistment enlistment )
        {
            // Set the enlistment state 
            enlistment.State = this;
 
            Monitor.Exit( enlistment.Transaction ); 
            try // Don't hold this lock while calling into the application code.
            { 
                if ( DiagnosticTrace.Verbose )
                {
                    EnlistmentNotificationCallTraceRecord.Trace( SR.GetString( SR.TraceSourceLtm ),
                        enlistment.EnlistmentTraceId, 
                        NotificationCall.InDoubt
                        ); 
                } 

                // Forward the notification to the enlistment 
                enlistment.EnlistmentNotification.InDoubt( enlistment.PreparingEnlistment );
            }
            finally
            { 
#pragma warning disable 0618
                //@ 
                Monitor.Enter(enlistment.Transaction); 
#pragma warning restore 0618
            } 
        }


        internal override void EnlistmentDone( InternalEnlistment enlistment ) 
        {
            // Move this enlistment to the ended state 
            _VolatileEnlistmentEnded.EnterState( enlistment ); 
        }
    } 


    // Ended state is the state that is entered when the transaction has committed,
    // aborted, or said read only for an enlistment.  At this point there are no valid 
    // operations on the enlistment.
    internal class VolatileEnlistmentEnded : VolatileEnlistmentState 
    { 
        internal override void EnterState( InternalEnlistment enlistment )
        { 
            // Set the enlistment state
            enlistment.State = this;

            // Nothing to do. 
        }
 
 
        internal override void ChangeStatePreparing( InternalEnlistment enlistment )
        { 
            // This enlistment was told to abort before being told to prepare
        }

 
        internal override void InternalAborted( InternalEnlistment enlistment )
        { 
            // Ignore this in case the enlistment gets here before 
            // the transaction tells it to do so
        } 


        internal override void InternalCommitted( InternalEnlistment enlistment )
        { 
            // Ignore this in case the enlistment gets here before
            // the transaction tells it to do so 
        } 

 
        internal override void InternalIndoubt(InternalEnlistment enlistment)
        {
            // Ignore this in case the enlistment gets here before
            // the transaction tells it to do so 
        }
 
        internal override void InDoubt(InternalEnlistment enlistment, Exception e) 
        {
            // Ignore this in case the enlistment gets here before 
            // the transaction tells it to do so
        }
    }
 

    // At some point either early or late the enlistment responded ReadOnly 
    internal class VolatileEnlistmentDone : VolatileEnlistmentEnded 
    {
        internal override void EnterState( InternalEnlistment enlistment ) 
        {
            // Set the enlistment state
            enlistment.State = this;
 
            // Nothing to do.
        } 
 

        internal override void ChangeStatePreparing( InternalEnlistment enlistment ) 
        {
            enlistment.CheckComplete();
        }
    } 
}
 

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

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