Nikolay Tsyb (HYS Enterprise) "Immortal system as a piece of cake."
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The document discusses using finite state machines and Spring State Machine to build fault-tolerant systems. It provides examples of state machines in real life, an example of a coin-operated turnstile state machine, and how Spring State Machine can be used to configure states, transitions, actions, guards, and listeners. It also discusses persisting state machine context and building immutable systems using a master-slave approach for deployment.
Nikolay Tsyb (HYS Enterprise) "Immortal system as a piece of cake."
- 1. Immortal system as a piece of cake By Nickolay Tsyb Javameetup
- 2. My experience Commerce software development over 8 years
- 3. My experience Now Im working in HYS-Enterprise as a teamlead
- 11. Call center
- 12. Call center
- 13. Call center
- 14. Call center
- 15. Starting Waiting Talking On hold Finishing
- 16. Starting Waiting Talking On hold Finishing
- 17. Starting Waiting Talking On hold Finishing Handling
- 22. Chapter 1 What is finite state machine?
- 23. Chapter 2 How to build fault tolerance system?
- 24. Chapter 3 Deep dive into spring state machine
- 25. Abstract mathematical model or graph with states and transitions
- 28. Examples from real life...
- 30. AI in computer games
- 31. Animal behavior
- 35. Transitions 1. Push ( -> ) 2. Push ( -> ) 3. Coin ( -> ) 4. Coin ( -> )
- 36. States handling void coin(State state) { ... if (state.equals(LOCKED)) { //coin implementation state = UNLOCKED; } ... }
- 38. States handling void push(State state) { ... if (state.equals(UNLOCKED)) { //push implementation state = LOCKED; } ... }
- 40. What about real project?
- 42. How can we just handle new state in project?
- 44. One of the main problems
- 48. High barrier to entry for new members of team
- 49. More time for testing
- 50. What could we do?
- 52. Decoupling business logic states handling
- 60. Support of extended state Sitting Eating Sleeping meow... Is hungry?
- 61. Support of internal state machine Sitting Eating meow... Is hungry?
- 64. Error handling and testing
- 65. Code example
- 66. public enum States { SITTING, EATING, SLEEPING; }
- 67. public enum Events { SIT, EAT, SLEEP; }
- 68. public void configure(StateMachineStateConfigurer<States, Events> states) throws Exception { states.withStates() .initial(States.SITTING) .state(States.EATING) .end(States.SLEEPING); }
- 69. public void configure(StateMachineTransitionConfigurer<States, Events> transitions) throws Exception { transitions .withExternal().source(States.SITTING).target(States.EATING).event(Events.EAT).and() .withExternal().source(States.EATING).target(States.SITTING).event(Events.SIT).and() .withExternal().source(States.SITTING).target(States.SLEEPING).event(Events.SLEEP).and() .withExternal().source(States.EATING).target(States.SLEEPING).event(Events.SLEEP); }
- 70. Data storage and persisting
- 71. Data storages
- 73. States persisting Events States Transitions Intercept and update State machine context
- 74. State machine context State machine context Serialization (Cryo by default) Redis Mongo JPA Add or update
- 75. State machine context State machine context Deserialization (Cryo by default) Redis Mongo JPA Restore
- 87. Build&Deployment process Push Trigger (pull&build)
- 88. Build&Deployment process Push Trigger (pull&build) Create and store image
- 89. Build&Deployment process Push Trigger (pull&build) Create and store image Get image
- 90. Build&Deployment process Push Trigger (pull&build) Create and store image Get image Deploy
- 91. Build&Deployment process Push Trigger (pull&build) Create and store image Get image Deploy
- 92. Conclusions
- 93. Conclusions
- 94. Conclusions
- 98. Contacts
- 99. Thank you for your attention!
- 100. Any Questions?