WorkflowInstance.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / RunTime / WorkflowInstance.cs / 1305376 / WorkflowInstance.cs
                        
                        
                            // **************************************************************************** 
// Copyright (C) Microsoft Corporation.  All rights reserved.
//

using System; 
using System.IO;
using System.Threading; 
using System.Diagnostics; 
using System.Globalization;
using System.Collections; 
using System.Collections.Generic;
using System.Collections.ObjectModel;

using System.Workflow.Runtime; 
using System.Workflow.ComponentModel;
using System.Workflow.Runtime.Hosting; 
 
namespace System.Workflow.Runtime
{ 
    /// 
    /// Schedule Instance handed over to the client
    /// 
    public sealed class WorkflowInstance 
    {
        private WorkflowRuntime _runtime; 
        private Guid _instanceId; 
        private WorkflowExecutor _deadWorkflow;
 
        internal WorkflowInstance(Guid instanceId, WorkflowRuntime workflowRuntime)
        {
            if (instanceId == Guid.Empty)
                throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, ExecutionStringManager.CantBeEmptyGuid, "instanceId")); 
            if (workflowRuntime == null)
                throw new ArgumentNullException("workflowRuntime"); 
 
            this._instanceId = instanceId;
            this._runtime = workflowRuntime; 
        }

        public Guid InstanceId
        { 
            get
            { 
                return _instanceId; 
            }
        } 

        public WorkflowRuntime WorkflowRuntime
        {
            get 
            {
                return _runtime; 
            } 
        }
 
        internal WorkflowExecutor DeadWorkflow
        {
            set
            { 
                Debug.Assert(value.WorkflowStatus == WorkflowStatus.Completed || value.WorkflowStatus == WorkflowStatus.Terminated,
                    "Dead workflow is not dead."); 
                _deadWorkflow = value; 
            }
        } 

        public ReadOnlyCollection GetWorkflowQueueData()
        {
            if (_deadWorkflow != null) 
                return _deadWorkflow.GetWorkflowQueueInfos();
 
            while (true) 
            {
                WorkflowExecutor executor = _runtime.Load(this); 
                if (executor.IsInstanceValid)
                {
                    try
                    { 
                        return executor.GetWorkflowQueueInfos();
                    } 
                    catch (InvalidOperationException) 
                    {
                        if (executor.IsInstanceValid) 
                            throw;
                    }
                }
            } 
        }
 
        public DateTime GetWorkflowNextTimerExpiration() 
        {
            while (true) 
            {
                WorkflowExecutor executor = _runtime.Load(this);
                if (executor.IsInstanceValid)
                { 
                    try
                    { 
                        return executor.GetWorkflowNextTimerExpiration(); 
                    }
                    catch (InvalidOperationException) 
                    {
                        if (executor.IsInstanceValid)
                            throw;
                    } 
                }
            } 
        } 

        public Activity GetWorkflowDefinition() 
        {
            while (true)
            {
                WorkflowExecutor executor = _runtime.Load(this); 
                if (executor.IsInstanceValid)
                { 
                    try 
                    {
                        // Make sure to get the clone here since the 
                        // definition is mutable and shared across all
                        // instances.
                        return executor.GetWorkflowDefinitionClone("");
                    } 
                    catch (InvalidOperationException)
                    { 
                        if (executor.IsInstanceValid) 
                            throw;
                    } 
                }
            }
        }
 
        public void Load()
        { 
            using (new WorkflowTraceTransfer(this.InstanceId)) 
            {
                this._runtime.Load(this); 
            }
        }

        public bool TryUnload() 
        {
            using (new WorkflowTraceTransfer(this.InstanceId)) 
            { 
                WorkflowExecutor executor = _runtime.Load(this);
                using (executor.ExecutorLock.Enter()) 
                {
                    if (executor.IsInstanceValid)
                    {
                        try 
                        {
                            return executor.TryUnload(); 
                        } 
                        catch (InvalidOperationException)
                        { 
                            if (executor.IsInstanceValid)
                                throw;
                        }
                    } 
                }
                return false; 
            } 
        }
 
        public void Suspend(string error)
        {
            using (new WorkflowTraceTransfer(this.InstanceId))
            { 
                while (true)
                { 
                    WorkflowExecutor executor = _runtime.Load(this); 
                    if (executor.IsInstanceValid)
                    { 
                        if (executor.WorkflowStatus == WorkflowStatus.Created)
                            throw new InvalidOperationException(ExecutionStringManager.CannotSuspendBeforeStart);
                        try
                        { 
                            executor.Suspend(error);
                            return; 
                        } 
                        catch (InvalidOperationException)
                        { 
                            if (executor.IsInstanceValid)
                                throw;
                        }
                        catch (ExecutorLocksHeldException e) 
                        {
                            try 
                            { 
                                e.Handle.WaitOne();
                            } 
                            catch (ObjectDisposedException)
                            {
                                // If an ObjectDisposedException is thrown because
                                // the WaitHandle has already closed, nothing to worry 
                                // about. Move on.
                            } 
                        } 
                    }
                } 
            }
        }

        public void Unload() 
        {
            using (new WorkflowTraceTransfer(this.InstanceId)) 
            { 
                if (_runtime == null || _runtime.GetService() == null)
                    throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, ExecutionStringManager.MissingPersistenceService, this.InstanceId)); 
                while (true)
                {
                    WorkflowExecutor executor = _runtime.Load(this);
                    if (executor.IsInstanceValid) 
                    {
                        try 
                        { 
                            executor.Unload();
                            return; 
                        }
                        catch (InvalidOperationException)
                        {
                            if (executor.IsInstanceValid) 
                                throw;
                        } 
                        catch (ExecutorLocksHeldException e) 
                        {
                            try 
                            {
                                e.Handle.WaitOne(/* maybe should have a timeout here?*/);
                            }
                            catch (ObjectDisposedException) 
                            {
                                // If an ObjectDisposedException is thrown because 
                                // the WaitHandle has already closed, nothing to worry 
                                // about. Move on.
                            } 
                        }
                    }
                }
            } 
        }
 
        public void Resume() 
        {
            using (new WorkflowTraceTransfer(this.InstanceId)) 
            {
                while (true)
                {
                    WorkflowExecutor executor = _runtime.Load(this); 
                    if (executor.IsInstanceValid)
                    { 
                        try 
                        {
                            executor.Resume(); 
                            break;
                        }
                        catch (InvalidOperationException)
                        { 
                            if (executor.IsInstanceValid)
                                throw; 
                        } 
                    }
                } 
            }
        }

        internal void ProcessTimers(object ignored) 
        {
            ProcessTimers(); 
        } 

        internal void ProcessTimers() 
        {
            using (new WorkflowTraceTransfer(this.InstanceId))
            {
                while (true) 
                {
                    WorkflowExecutor executor = null; 
                    try 
                    {
                        executor = _runtime.Load(this); 
                    }
                    catch (InvalidOperationException)
                    {
                        break; 
                    }
                    if (executor != null && executor.IsInstanceValid) 
                    { 
                        try
                        { 
                            executor.DeliverTimerSubscriptions();
                            break;
                        }
                        catch (InvalidOperationException) 
                        {
                            if (executor.IsInstanceValid) 
                                throw; 
                        }
                    } 
                }
            }
        }
 
        public void Terminate(string error)
        { 
            using (new WorkflowTraceTransfer(this.InstanceId)) 
            {
                while (true) 
                {
                    WorkflowExecutor executor = _runtime.Load(this);
                    if (executor.IsInstanceValid)
                    { 
                        try
                        { 
                            executor.Terminate(error); 
                            break;
                        } 
                        catch (InvalidOperationException)
                        {
                            if (executor.IsInstanceValid)
                                throw; 
                        }
                    } 
                } 
            }
        } 

        public void Abort()
        {
            using (new WorkflowTraceTransfer(this.InstanceId)) 
            {
                while (true) 
                { 
                    WorkflowExecutor executor = _runtime.Load(this);
                    if (executor.IsInstanceValid) 
                    {
                        if (executor.WorkflowStatus == WorkflowStatus.Created)
                            throw new InvalidOperationException(ExecutionStringManager.CannotAbortBeforeStart);
 
                        try
                        { 
                            executor.Abort(); 
                            break;
                        } 
                        catch (InvalidOperationException)
                        {
                            if (executor.IsInstanceValid)
                                throw; 
                        }
                    } 
                } 
            }
        } 

        public void ReloadTrackingProfiles()
        {
            using (new WorkflowTraceTransfer(this.InstanceId)) 
            {
                while (true) 
                { 
                    WorkflowExecutor executor = _runtime.Load(this);
                    if (executor.IsInstanceValid) 
                    {
                        try
                        {
                            _runtime.TrackingListenerFactory.ReloadProfiles(executor); 
                            break;
                        } 
                        catch (InvalidOperationException) 
                        {
                            if (executor.IsInstanceValid) 
                                throw;
                        }
                    }
                } 
            }
        } 
 
        public void ApplyWorkflowChanges(WorkflowChanges workflowChanges)
        { 
            using (new WorkflowTraceTransfer(this.InstanceId))
            {
                while (true)
                { 
                    WorkflowExecutor executor = _runtime.Load(this);
                    if (executor.IsInstanceValid) 
                    { 
                        try
                        { 
                            executor.ApplyWorkflowChanges(workflowChanges);
                            break;
                        }
                        catch (InvalidOperationException) 
                        {
                            if (executor.IsInstanceValid) 
                                throw; 
                        }
                    } 
                }
            }
        }
 
        public void EnqueueItem(IComparable queueName, Object item, IPendingWork pendingWork, Object workItem)
        { 
            using (new WorkflowTraceTransfer(this.InstanceId)) 
            {
                while (true) 
                {
                    WorkflowExecutor executor = _runtime.Load(this);
                    try
                    { 
                        executor.EnqueueItem(queueName, item, pendingWork, workItem);
                        break; 
                    } 
                    catch (InvalidOperationException)
                    { 
                        if (executor.IsInstanceValid)
                            throw;
                    }
                } 
            }
        } 
 
        public void EnqueueItemOnIdle(IComparable queueName, Object item, IPendingWork pendingWork, Object workItem)
        { 
            using (new WorkflowTraceTransfer(this.InstanceId))
            {
                while (true)
                { 
                    WorkflowExecutor executor = _runtime.Load(this);
                    if (executor.IsInstanceValid) 
                    { 
                        try
                        { 
                            executor.EnqueueItemOnIdle(queueName, item, pendingWork, workItem);
                            break;
                        }
                        catch (InvalidOperationException) 
                        {
                            if (executor.IsInstanceValid) 
                                throw; 
                        }
                    } 
                }
            }
        }
 
        internal WorkflowExecutor GetWorkflowResourceUNSAFE()
        { 
            while (true) 
            {
                WorkflowExecutor executor = _runtime.Load(this); 
                if (executor.IsInstanceValid)
                {
                    try
                    { 
                        return executor;
                    } 
                    catch (InvalidOperationException) 
                    {
                        if (executor.IsInstanceValid) 
                            throw;
                    }
                }
            } 
        }
 
        public override bool Equals(Object obj) 
        {
            WorkflowInstance instance = obj as WorkflowInstance; 
            if (instance == null)
                return false;

            return this._instanceId == instance._instanceId; 
        }
 
        public override int GetHashCode() 
        {
            return this._instanceId.GetHashCode(); 
        }

        public void Start()
        { 
            using (new WorkflowTraceTransfer(this.InstanceId))
            { 
                while (true) 
                {
                    WorkflowExecutor executor = _runtime.Load(this); 
                    if (executor.IsInstanceValid)
                    {
                        try
                        { 
                            executor.Start();
                            break; 
                        } 
                        catch (InvalidOperationException)
                        { 
                            if (executor.IsInstanceValid)
                                throw;
                        }
                    } 
                }
            } 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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WorkflowInstance.cs source code in C# .NET

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