Resources For IT Professionals
Post an article
Wikis - Page Details
  • First published by
  • When: 7 Aug 2013 11:37 PM
  • Last revision by (aMicrosof)
  • When: 8 Aug 2013 10:28 AM
  • Revisions: 5
  • Comments: 2
Options
RSSSubscribe to Article (RSS)
Can You Improve This Article?
Positively! Click Sign In to add the tip, solution, correction or comment that will help other users.

Report inappropriate content using these instructions.
Wiki  >  TechNet Articles  >  Visual C#: MultiThreadSingleton

Visual C#: MultiThreadSingleton

Visual C#: MultiThreadSingleton

This article demonstrates how to make multi threaded singleton

01.public sealed class MultiThreadSingleton<T> where T : class
02.    {
03.        #region Private Fields
04.        /// <summary>
05.        ///
06.        /// </summary>
07.        private static volatile T instance;
08. 
09.        /// <summary>
10.        ///  sync lock for creating
11.        /// </summary>
12.        private static object synclock = new object();
13. 
14.        #endregion
15. 
16.        #region Constructor
17.        /// <summary>
18.        /// Initializes QMultiThreadSingleton
19.        /// </summary>
20.        private MultiThreadSingleton()
21.        {
22.        }
23. 
24.        #endregion
25. 
26.        /// <summary>
27.        ///
28.        /// </summary>
29.        public static T Instance
30.        {
31.            get
32.            {
33.                if (instance == null)
34.                {
35.                    lock (synclock)
36.                    {
37.                        if (instance == null)
38.                        {
39.                           var type = typeof(T);
40.                           instance = Activator.CreateInstance(type, true) as T;                           
41.                        }
42.                    }
43.                }
44.                return instance;
45.            }
46.        }
47. 
48.    }

now  check that singleton in  multiple threads

01.class Program
02.    {
03.        static void Main(string[] args)
04.        {
05.            DemoClassOne test = MultiThreadSingleton<DemoClassOne>.Instance;
06.            test.SampleInetgerProperty = 99;
07.            test.DemoPropertyOne = "No Operation";
08. 
09.            Parallel.For(0, 5, i => {
10.                ThreadTest threadObject = new ThreadTest(i);
11.                DemoClassOne singletonObj = MultiThreadSingleton<DemoClassOne>.Instance;
12.                threadObject.MyProperty = singletonObj;
13.                Parallel.For(0, 2, j => {
14.                    if (j == 0)
15.                    {
16.                        lock (threadObject)
17.                        {
18.                            threadObject.OperationOne();
19.                        }
20.                    }
21.                    else
22.                    {
23.                        lock (threadObject)
24.                        {
25.                            threadObject.OperationTwo();
26.                        }
27.                    }
28.                });
29. 
30.                
31.            });
32. 
33.            var newobject = MultiThreadSingleton<DemoClassOne>.Instance;
34. 
35.            Console.WriteLine("Thread {0} ,Final , MyProperty.CheckBoolProoperty {1} , MyProperty.SampleInetgerProperty {2} ,MyProperty.DemoPropertyOne {3}",
36.               System.Threading.Thread.CurrentThread.ManagedThreadId, newobject.CheckBoolProoperty, newobject.SampleInetgerProperty, newobject.DemoPropertyOne);           
37.            Console.ReadLine();
38. 
39.        }       
40.    }
41. 
42. 
43.    public class ThreadTest
44.    {
45. 
46.        public DemoClassOne MyProperty { get; set; }
47. 
48.        private int ThreadId { get; set; }
49. 
50.        private int randomNumber = 0;
51. 
52.        public ThreadTest(int threadId)
53.        {
54.            this.ThreadId = threadId;
55.            this.randomNumber = new Random().Next(2, 12);
56.             
57.        }
58. 
59.        public void OperationOne()
60.        {
61.            Console.WriteLine("Thread {0} ,OperationOne Start , MyProperty.CheckBoolProoperty {1} , MyProperty.SampleInetgerProperty {2} ,MyProperty.DemoPropertyOne {3}",
62.                this.ThreadId, this.MyProperty.CheckBoolProoperty, this.MyProperty.SampleInetgerProperty, this.MyProperty.DemoPropertyOne);
63.            if (!this.MyProperty.CheckBoolProoperty)           
64.            {
65.                this.MyProperty.DemoPropertyOne = "Operation 1";
66.                this.MyProperty.SampleInetgerProperty = this.ThreadId * 3;
67.                this.MyProperty.CheckBoolProoperty = !this.MyProperty.CheckBoolProoperty;
68. 
69.            }
70.            Console.WriteLine("Thread {0} ,OperationOne End , MyProperty.CheckBoolProoperty {1} , MyProperty.SampleInetgerProperty {2} ,MyProperty.DemoPropertyOne {3}",
71.                this.ThreadId, this.MyProperty.CheckBoolProoperty, this.MyProperty.SampleInetgerProperty, this.MyProperty.DemoPropertyOne);
72. 
73. 
74.        }
75. 
76.        public void OperationTwo()
77.        {
78.            Console.WriteLine("Thread {0} ,OperationTwo Start , MyProperty.CheckBoolProoperty {1} , MyProperty.SampleInetgerProperty {2} ,MyProperty.DemoPropertyOne {3}",
79.                this.ThreadId, this.MyProperty.CheckBoolProoperty, this.MyProperty.SampleInetgerProperty, this.MyProperty.DemoPropertyOne);
80.            if (this.MyProperty.CheckBoolProoperty)
81.            {
82.                this.MyProperty.DemoPropertyOne = "Operation 2";
83.                this.MyProperty.SampleInetgerProperty = this.ThreadId * 3;
84.                this.MyProperty.CheckBoolProoperty = !this.MyProperty.CheckBoolProoperty;
85. 
86.            }
87.            Console.WriteLine("Thread {0} ,OperationTwo End , MyProperty.CheckBoolProoperty {1} , MyProperty.SampleInetgerProperty {2} ,MyProperty.DemoPropertyOne {3}",
88.                this.ThreadId, this.MyProperty.CheckBoolProoperty, this.MyProperty.SampleInetgerProperty, this.MyProperty.DemoPropertyOne);
89.        }
90. 
91.         
92.         
93.    }

, , , , [Edit tags]
Leave a Comment
  • Please add 3 and 7 and type the answer here:
  • Post
Wiki - Revision Comment List(Revision Comment)
Sort by: Published Date | Most Recent | Most Useful
Comments
  • 8 Aug 2013 8:35 AM

    Naomi  N edited Revision 1. Comment: Article needs more work

Page 1 of 1 (1 items)
Wikis - Comment List
Sort by: Published Date | Most Recent | Most Useful
Posting comments is temporarily disabled until 10:00am PST on Saturday, December 14th. Thank you for your patience.
Comments
  • Posted by
    on 8 Aug 2013 10:22 AM

    Can you explain what this code is doing, and when/why you would want to do it? Is this for the August C# Guru contest? If so, is it added to that page yet?

    Thanks!

  • Posted by
    on 8 Aug 2013 8:35 AM

    Naomi  N edited Revision 1. Comment: Article needs more work

Page 1 of 1 (2 items)