WorkflowQueue.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / RunTime / WorkflowQueue.cs / 1305376 / WorkflowQueue.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------
using System;
using System.Collections; 
using System.Collections.Generic;
using System.Text; 
using System.Diagnostics; 
using System.Workflow.ComponentModel;
 
namespace System.Workflow.Runtime
{
    public class WorkflowQueue
    { 
        IComparable queueName;
        WorkflowQueuingService qService; 
 
        internal WorkflowQueue(WorkflowQueuingService qService, IComparable queueName)
        { 
            this.qService = qService;
            this.queueName = queueName;
        }
 
        public event EventHandler QueueItemAvailable
        { 
            add 
            {
                if (value == null) 
                    throw new ArgumentNullException("value");

                lock (qService.SyncRoot)
                { 
                    EventQueueState qState = qService.GetQueueState(this.queueName);
                    ActivityExecutorDelegateInfo subscriber = new ActivityExecutorDelegateInfo(value, qService.CallingActivity); 
                    qState.AsynchronousListeners.Add(subscriber); 
                    WorkflowTrace.Runtime.TraceEvent(TraceEventType.Information, 0, "WorkflowQueue:QueueItemAvailable subscribe for activity '{0}' with context Id {1}", subscriber.ActivityQualifiedName, subscriber.ContextId);
 
                    if (qState.AsynchronousListeners.Count == 1)
                        qService.NotifyAsynchronousSubscribers(this.queueName, qState, qState.Messages.Count);
                }
            } 
            remove
            { 
                lock (qService.SyncRoot) 
                {
                    ActivityExecutorDelegateInfo subscriber = new ActivityExecutorDelegateInfo(value, qService.CallingActivity); 
                    bool removed = qService.GetQueueState(this.queueName).AsynchronousListeners.Remove(subscriber);
                    if (!removed)
                    {
                        WorkflowTrace.Runtime.TraceEvent(TraceEventType.Information, 0, "WorkflowQueue:QueueItemAvailable unsubscribe failed for activity '{0}' with context Id {1} ", subscriber.ActivityQualifiedName, subscriber.ContextId); 
                    }
                } 
            } 
        }
 
        public void RegisterForQueueItemAvailable(IActivityEventListener eventListener)
        {
            RegisterForQueueItemAvailable(eventListener, null);
        } 
        public void RegisterForQueueItemAvailable(IActivityEventListener eventListener, string subscriberQualifiedName)
        { 
            if (eventListener == null) 
                throw new ArgumentNullException("eventListener");
 
            lock (qService.SyncRoot)
            {
                EventQueueState qState = qService.GetQueueState(this.queueName);
                ActivityExecutorDelegateInfo subscriber = new ActivityExecutorDelegateInfo(eventListener, qService.CallingActivity); 
                if (subscriberQualifiedName != null)
                { 
                    subscriber.SubscribedActivityQualifiedName = subscriberQualifiedName; 
                }
                qState.AsynchronousListeners.Add(subscriber); 
                WorkflowTrace.Runtime.TraceEvent(TraceEventType.Information, 0, "WorkflowQueue:QueueItemAvailable subscribe for activity '{0}' with context Id {1}", subscriber.ActivityQualifiedName, subscriber.ContextId);

                if (qState.AsynchronousListeners.Count == 1)
                    qService.NotifyAsynchronousSubscribers(this.queueName, qState, qState.Messages.Count); 
            }
        } 
        public void UnregisterForQueueItemAvailable(IActivityEventListener eventListener) 
        {
            if (eventListener == null) 
                throw new ArgumentNullException("eventListener");

            lock (qService.SyncRoot)
            { 
                ActivityExecutorDelegateInfo subscriber = new ActivityExecutorDelegateInfo(eventListener, qService.CallingActivity);
                bool removed = qService.GetQueueState(this.queueName).AsynchronousListeners.Remove(subscriber); 
                if (!removed) 
                {
                    WorkflowTrace.Runtime.TraceEvent(TraceEventType.Information, 0, "WorkflowQueue:QueueItemAvailable unsubscribe failed for activity '{0}' with context Id {1}", subscriber.ActivityQualifiedName, subscriber.ContextId); 
                }
            }
        }
 
        public event EventHandler QueueItemArrived
        { 
            add 
            {
                if (value == null) 
                    throw new ArgumentNullException("value");

                lock (qService.SyncRoot)
                { 
                    qService.GetQueueState(this.queueName).SynchronousListeners.Add(new ActivityExecutorDelegateInfo(value, qService.CallingActivity));
                } 
            } 
            remove
            { 
                if (value == null)
                    throw new ArgumentNullException("value");

                lock (qService.SyncRoot) 
                {
                    qService.GetQueueState(this.queueName).SynchronousListeners.Remove(new ActivityExecutorDelegateInfo(value, qService.CallingActivity)); 
                } 
            }
        } 
        public void RegisterForQueueItemArrived(IActivityEventListener eventListener)
        {
            if (eventListener == null)
                throw new ArgumentNullException("eventListener"); 

            lock (qService.SyncRoot) 
            { 
                qService.GetQueueState(this.queueName).SynchronousListeners.Add(new ActivityExecutorDelegateInfo(eventListener, qService.CallingActivity));
            } 
        }
        public void UnregisterForQueueItemArrived(IActivityEventListener eventListener)
        {
            if (eventListener == null) 
                throw new ArgumentNullException("eventListener");
 
            lock (qService.SyncRoot) 
            {
                qService.GetQueueState(this.queueName).SynchronousListeners.Remove(new ActivityExecutorDelegateInfo(eventListener, qService.CallingActivity)); 
            }
        }

        public IComparable QueueName 
        {
            get 
            { 
                return this.queueName;
            } 
        }

        public WorkflowQueuingService QueuingService
        { 
            get
            { 
                return this.qService; 
            }
        } 

        public void Enqueue(object item)
        {
            lock (qService.SyncRoot) 
            {
                qService.EnqueueEvent(this.queueName, item); 
            } 
        }
 
        public object Dequeue()
        {
            lock (qService.SyncRoot)
            { 
                object message = qService.Peek(this.queueName);
 
                return qService.DequeueEvent(this.queueName); 
            }
        } 

        public object Peek()
        {
            lock (qService.SyncRoot) 
            {
                object message = qService.Peek(this.queueName); 
 
                return message;
            } 
        }

        public int Count
        { 
            get
            { 
                lock (qService.SyncRoot) 
                {
                    return this.qService.GetQueueState(this.queueName).Messages.Count; 
                }
            }
        }
 
        public bool Enabled
        { 
            get 
            {
                lock (qService.SyncRoot) 
                {
                    return this.qService.GetQueueState(this.queueName).Enabled;
                }
            } 
            set
            { 
                lock (qService.SyncRoot) 
                {
                    this.qService.GetQueueState(this.queueName).Enabled = value; 
                }
            }
        }
    } 
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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WorkflowQueue.cs source code in C# .NET

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