Design Pattern D ESIGN P ATTERN
Design Pattern Outline What is ? Why Design Pattern? Pattern In Action Observer Pattern SingleTon Pattern Classification F...
Design Pattern What is DP General  * Reusable *  solution to  Commonly Occurring problem (Experience Reuse Rather Code Reu...
Design Pattern Learn DP There are around 50(!)s of DPs  Already done for you.  So, We Won’t  ** REINVENT THE WHEEL **
Design Pattern DP There are around 50(!)s of DPs  Already done for you.  So, We Won’t  ** REINVENT THE WHEEL **
Design Pattern Pattern In action Google Alert / RSS Feed What Happens?
Design Pattern Pattern In action Google Alert / RSS Feed What Happens? 1. New user can subscribe any time
Design Pattern Pattern In action Google Alert / RSS Feed <ul><li>What Happens? </li></ul><ul><li>New user can subscribe an...
Design Pattern Pattern In action Google Alert / RSS Feed <ul><li>What Happens? </li></ul><ul><li>New user can subscribe an...
Design Pattern Pattern In action Google Alert / RSS Feed <ul><li>What Happens? </li></ul><ul><li>New user can subscribe an...
Design Pattern Pattern In action Google Alert / RSS Feed <ul><li>What Happens? </li></ul><ul><li>New user can subscribe an...
Design Pattern Pattern In action Google Alert / RSS Feed <ul><li>What Happens? </li></ul><ul><li>New user can subscribe an...
Design Pattern Pattern In action Solution is The OBSERVER PATTERN
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Design pattern

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Design pattern

  1. 1. Design Pattern D ESIGN P ATTERN
  2. 2. Design Pattern Outline What is ? Why Design Pattern? Pattern In Action Observer Pattern SingleTon Pattern Classification Feedback
  3. 3. Design Pattern What is DP General * Reusable * solution to Commonly Occurring problem (Experience Reuse Rather Code Reuse) Description or Template for how to Solve A * Common Problem *
  4. 4. Design Pattern Learn DP There are around 50(!)s of DPs Already done for you. So, We Won’t ** REINVENT THE WHEEL **
  5. 5. Design Pattern DP There are around 50(!)s of DPs Already done for you. So, We Won’t ** REINVENT THE WHEEL **
  6. 6. Design Pattern Pattern In action Google Alert / RSS Feed What Happens?
  7. 7. Design Pattern Pattern In action Google Alert / RSS Feed What Happens? 1. New user can subscribe any time
  8. 8. Design Pattern Pattern In action Google Alert / RSS Feed <ul><li>What Happens? </li></ul><ul><li>New user can subscribe any time </li></ul><ul><li>Existing user can De subscribe </li></ul>
  9. 9. Design Pattern Pattern In action Google Alert / RSS Feed <ul><li>What Happens? </li></ul><ul><li>New user can subscribe any time </li></ul><ul><li>Existing user can Desubscribe </li></ul>
  10. 10. Design Pattern Pattern In action Google Alert / RSS Feed <ul><li>What Happens? </li></ul><ul><li>New user can subscribe any time </li></ul><ul><li>Existing user can Desubscribe </li></ul>
  11. 11. Design Pattern Pattern In action Google Alert / RSS Feed <ul><li>What Happens? </li></ul><ul><li>New user can subscribe any time </li></ul><ul><li>Existing user can Desubscribe </li></ul><ul><li>When any updates (Google) </li></ul><ul><li>automatically Flood this to all </li></ul><ul><li>subcribers </li></ul>
  12. 12. Design Pattern Pattern In action Google Alert / RSS Feed <ul><li>What Happens? </li></ul><ul><li>New user can subscribe any time </li></ul><ul><li>Existing user can Desubscribe </li></ul><ul><li>When any updates (Google) </li></ul><ul><li>automatically Flood this to all </li></ul><ul><li>subcribers </li></ul>
  13. 13. Design Pattern Pattern In action Solution is The OBSERVER PATTERN

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