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3 | 3 |
|
4 | 4 | namespace ObserverPattern
|
5 | 5 | {
|
6 |
| -class JobPost |
7 |
| -{ |
8 |
| - public string Title { get; private set; } |
9 |
| - |
10 |
| - public JobPost(string title) |
| 6 | + class JobPost |
11 | 7 | {
|
12 |
| - Title = title; |
13 |
| - } |
14 |
| -} |
15 |
| -class JobSeeker : IObserver<JobPost> |
16 |
| -{ |
17 |
| - public string Name { get; private set; } |
| 8 | + public string Title { get; private set; } |
18 | 9 |
|
19 |
| - public JobSeeker(string name) |
20 |
| - { |
21 |
| - Name = name; |
| 10 | + public JobPost(string title) |
| 11 | + { |
| 12 | + Title = title; |
| 13 | + } |
22 | 14 | }
|
23 |
| - |
24 |
| - //Method is not being called by JobPostings class currently |
25 |
| - public void OnCompleted() |
| 15 | + class JobSeeker : IObserver<JobPost> |
26 | 16 | {
|
27 |
| - //No Implementation |
28 |
| - } |
| 17 | + public string Name { get; private set; } |
29 | 18 |
|
30 |
| - //Method is not being called by JobPostings class currently |
31 |
| - public void OnError(Exception error) |
32 |
| - { |
33 |
| - //No Implementation |
34 |
| - } |
35 |
| - |
36 |
| - public void OnNext(JobPost value) |
37 |
| - { |
38 |
| - Console.WriteLine("Hi {0} ! New job posted: {1}", Name, value.Title); |
39 |
| - } |
40 |
| -} |
| 19 | + public JobSeeker(string name) |
| 20 | + { |
| 21 | + Name = name; |
| 22 | + } |
41 | 23 |
|
42 |
| -class JobPostings : IObservable<JobPost> |
43 |
| -{ |
44 |
| - private List<IObserver<JobPost>> mObservers; |
45 |
| - private List<JobPost> mJobPostings; |
| 24 | + //Method is not being called by JobPostings class currently |
| 25 | + public void OnCompleted() |
| 26 | + { |
| 27 | + //No Implementation |
| 28 | + } |
46 | 29 |
|
47 |
| - public JobPostings() |
48 |
| - { |
49 |
| - mObservers = new List<IObserver<JobPost>>(); |
50 |
| - mJobPostings = new List<JobPost>(); |
51 |
| - } |
| 30 | + //Method is not being called by JobPostings class currently |
| 31 | + public void OnError(Exception error) |
| 32 | + { |
| 33 | + //No Implementation |
| 34 | + } |
52 | 35 |
|
53 |
| - public IDisposable Subscribe(IObserver<JobPost> observer) |
54 |
| - { |
55 |
| - // Check whether observer is already registered. If not, add it |
56 |
| - if (!mObservers.Contains(observer)) |
| 36 | + public void OnNext(JobPost value) |
57 | 37 | {
|
58 |
| - mObservers.Add(observer); |
| 38 | + Console.WriteLine("Hi {0} ! New job posted: {1}", Name, value.Title); |
59 | 39 | }
|
60 |
| - return new Unsubscriber<JobPost>(mObservers, observer); |
61 | 40 | }
|
62 | 41 |
|
63 |
| - private void Notify(JobPost jobPost) |
| 42 | + class JobPostings : IObservable<JobPost> |
64 | 43 | {
|
65 |
| - foreach(var observer in mObservers) |
| 44 | + private List<IObserver<JobPost>> mObservers; |
| 45 | + private List<JobPost> mJobPostings; |
| 46 | + |
| 47 | + public JobPostings() |
66 | 48 | {
|
67 |
| - observer.OnNext(jobPost); |
| 49 | + mObservers = new List<IObserver<JobPost>>(); |
| 50 | + mJobPostings = new List<JobPost>(); |
68 | 51 | }
|
69 |
| - } |
70 | 52 |
|
71 |
| - public void AddJob(JobPost jobPost) |
72 |
| - { |
73 |
| - mJobPostings.Add(jobPost); |
74 |
| - Notify(jobPost); |
75 |
| - } |
| 53 | + public IDisposable Subscribe(IObserver<JobPost> observer) |
| 54 | + { |
| 55 | + // Check whether observer is already registered. If not, add it |
| 56 | + if (!mObservers.Contains(observer)) |
| 57 | + { |
| 58 | + mObservers.Add(observer); |
| 59 | + } |
| 60 | + return new Unsubscriber<JobPost>(mObservers, observer); |
| 61 | + } |
76 | 62 |
|
77 |
| -} |
| 63 | + private void Notify(JobPost jobPost) |
| 64 | + { |
| 65 | + foreach (var observer in mObservers) |
| 66 | + { |
| 67 | + observer.OnNext(jobPost); |
| 68 | + } |
| 69 | + } |
78 | 70 |
|
79 |
| -internal class Unsubscriber<JobPost> : IDisposable |
80 |
| -{ |
81 |
| - private List<IObserver<JobPost>> mObservers; |
82 |
| - private IObserver<JobPost> mObserver; |
| 71 | + public void AddJob(JobPost jobPost) |
| 72 | + { |
| 73 | + mJobPostings.Add(jobPost); |
| 74 | + Notify(jobPost); |
| 75 | + } |
83 | 76 |
|
84 |
| - internal Unsubscriber(List<IObserver<JobPost>> observers, IObserver<JobPost> observer) |
85 |
| - { |
86 |
| - this.mObservers = observers; |
87 |
| - this.mObserver = observer; |
88 | 77 | }
|
89 | 78 |
|
90 |
| - public void Dispose() |
| 79 | + internal class Unsubscriber<JobPost> : IDisposable |
91 | 80 | {
|
92 |
| - if (mObservers.Contains(mObserver)) |
93 |
| - mObservers.Remove(mObserver); |
| 81 | + private List<IObserver<JobPost>> mObservers; |
| 82 | + private IObserver<JobPost> mObserver; |
| 83 | + |
| 84 | + internal Unsubscriber(List<IObserver<JobPost>> observers, IObserver<JobPost> observer) |
| 85 | + { |
| 86 | + this.mObservers = observers; |
| 87 | + this.mObserver = observer; |
| 88 | + } |
| 89 | + |
| 90 | + public void Dispose() |
| 91 | + { |
| 92 | + if (mObservers.Contains(mObserver)) |
| 93 | + mObservers.Remove(mObserver); |
| 94 | + } |
94 | 95 | }
|
95 |
| -} |
96 | 96 |
|
97 | 97 |
|
98 | 98 | class Program
|
99 | 99 | {
|
100 | 100 | static void Main(string[] args)
|
101 | 101 | {
|
102 |
| -//Create Subscribers |
103 |
| -var johnDoe = new JobSeeker("John Doe"); |
104 |
| -var janeDoe = new JobSeeker("Jane Doe"); |
| 102 | + //Create Subscribers |
| 103 | + var johnDoe = new JobSeeker("John Doe"); |
| 104 | + var janeDoe = new JobSeeker("Jane Doe"); |
105 | 105 |
|
106 |
| -//Create publisher and attch subscribers |
107 |
| -var jobPostings = new JobPostings(); |
108 |
| -jobPostings.Subscribe(johnDoe); |
109 |
| -jobPostings.Subscribe(janeDoe); |
| 106 | + //Create publisher and attch subscribers |
| 107 | + var jobPostings = new JobPostings(); |
| 108 | + jobPostings.Subscribe(johnDoe); |
| 109 | + jobPostings.Subscribe(janeDoe); |
110 | 110 |
|
111 |
| -//Add a new job and see if subscribers get notified |
112 |
| -jobPostings.AddJob(new JobPost("Software Engineer")); |
| 111 | + //Add a new job and see if subscribers get notified |
| 112 | + jobPostings.AddJob(new JobPost("Software Engineer")); |
113 | 113 |
|
114 |
| -//Output |
115 |
| -// Hi John Doe! New job posted: Software Engineer |
116 |
| -// Hi Jane Doe! New job posted: Software Engineer |
| 114 | + //Output |
| 115 | + // Hi John Doe! New job posted: Software Engineer |
| 116 | + // Hi Jane Doe! New job posted: Software Engineer |
117 | 117 |
|
118 |
| -Console.ReadLine(); |
| 118 | + Console.ReadLine(); |
119 | 119 | }
|
120 | 120 | }
|
121 | 121 | }
|
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