The document discusses the evolution of application architectures from monolithic to microservices and reactive distributed systems. It covers topics like microservices, event-driven architectures, CQRS, event sourcing, and serverless/functions-based computing. The key stages of evolution involve moving from monolithic applications to modularized services, introducing distributed systems concepts like service discovery, moving to reactive programming models using handlers and event buses, and serverless/functions-based models.

1. Reactive & Distributed
Modern Application Architectures

2. Orkhan Gasimov
Digital Transformation Architect @ GlobalLogic
15 years of software engineering;
training & mentorship;
2Speaker

3. Backstage
3Agenda

4. 4Some silly slide

5. Evolution
Past

6. 6
App Server
Evolution
Monolith

7. 7
App Server
Module
Module
Module
Module
Evolution
Monolith

8. 8Evolution
App Server 1
Module
Module
Module
Module
App Server N
Module
Module
Module
Module
Monolith

9. 9Evolution
App Server 1
Module
Module
Module
Module
App Server N
Module
Module
Module
Module
Admin Server
Deployment & Configuration
Monolith

10. 10Evolution
Module
Module
Module
Module
Module
Module
Module
Module
Admin Server
Deployment & Configuration
Monolith

11. 11Evolution
Admin Server
Deployment & Configuration
App
App
App
App
App
App
App
App
Monolith

12. 12Evolution
App
App
App
App
App
App
App
App
Discovery & Configuration
Monolith Microservices

13. Microservices
Architecture

14. 14Monolith
Sales
Warehouse
Accounting
Discounts
Client

15. 15Service-Oriented
Sales
Warehouse
Accounting
Discounts
Client

16. Sales
Sales
16Scalability
Sales
Warehouse
Accounting
Discounts
Client

17. 17API Gateway
Sales
Sales
Sales
Warehouse
Accounting
Discounts
Client API Gateway

18. 18Service Discovery
Sales
Sales
Sales
Warehouse
Accounting
Discounts
Client API Gateway
Service
Registry

19. Users
Accounting
Warehouse
19Dynamic Coordination
Sales
Sales
Warehouse
Accounting
Discounts
Client API Gateway
Service
Registry

20. 20Cascading Calls
Sales Warehouse Accounting
Discounts

21. 21Cascading Calls
Sales Warehouse
Discounts
Accounting

22. 22Circuit Breaker
Sales Warehouse
Discounts
AccountingCB
Fallback

23. 23Circuit Breaker
Sales Warehouse
Discounts
AccountingCB CB
CB

24. Users
Accounting
Warehouse
24Microservices
Sales
Discounts
Sales
Warehouse
Accounting
Client API Gateway
Service
Registry
CB
CB
CB
CB

25. 25Evolution
App
App
App
App
App
App
App
App
Discovery & Configuration
Monolith Microservices
Discounts
Sales Warehouse
Accounting

26. 26Evolution
App
App
App
App
App
App
App
App
App
App
App App
App
App
App
App
App
App
App
App
Discovery & Configuration
Monolith Microservices

27. 27Evolution
App
App
App
App
App
App
App
App
App
App
App App
App
App
App
App
App
App
App
App
Server
Discovery & Configuration
Monolith Microservices

28. 28Evolution
App
App
App
App
App
App
App
App
App
App
App App
App
App
App
App
App
App
App
App
Server
Modules
Discovery & Configuration
Monolith Microservices

29. 29Evolution
App
App
App
App
App
App
App
App
App
App
App App
App
App
App
App
App
App
App
App
Server
Modules
Fn
Discovery & Configuration
Monolith Microservices

30. 30Evolution
App
App
App
App
App
App
App
App
App
App
App App
App
App
App
App
App
App
App
App
Server
Modules
Fn ?
Discovery & Configuration
Monolith Microservices

31. 31Evolution
App
App
App
App
App
App
App
App
App
App
App App
App
App
App
App
App
App
App
App
Server
Modules
Fn ?
Server
Modules
Fn ?
Server
Modules
Fn ?
Server
Modules
Fn ?
Server
Modules
Fn ?
Server
Modules
Fn ?
Server
Modules
Fn ?
Server
Modules
Fn ?
Discovery & Configuration
Monolith Microservices

32. 32Evolution
App
App
App
App
App
App
App
App
App
App
App App
App
App
App
App
App
App
App
App
Server
Modules
?
Server
Modules
?
Server
Modules
?
Server
Modules
?
Server
Modules
?
Server
Modules
?
Server
Modules
?
Server
Modules
?
Discovery & Configuration
Fn
Fn
Fn
Fn
Fn
Fn
Fn
Fn
Monolith Microservices

33. Data Microservices
Concept

34. 34Data Oriented
Processor

35. 35Data Oriented
Source Processor

36. 36Data Oriented
Source SinkProcessor

37. 37CQRS + Event Sourcing
Client API Gateway

38. 38CQRS + Event Sourcing
Client API Gateway
Command
Query

39. 39CQRS + Event Sourcing
Query
Command
Client API Gateway
Command
Query

40. 40CQRS + Event Sourcing
Query
Command
Client API Gateway
Service
Registry
Command
Query

41. 41CQRS + Event Sourcing
Query
Command
Client API Gateway
Service
Registry
Command
Query
DB DB

42. 42CQRS + Event Sourcing
Query
Command
Client API Gateway
Service
Registry
Command
Query
DB DB
Event
Store

43. 43CQRS + Event Sourcing
Query
Command
Client API Gateway
Service
Registry
Command
Query
DB DB
Event
Store
Event
Handler

44. 44CQRS + Event Sourcing
Query
Command
Client API Gateway
Service
Registry
Command
Query
DB
Event
Store
Event
Handler
DB
Fn Fn Fn

45. 45Pipelines
Fn Fn Fn

46. 46CQRS + Event Sourcing
Query
Command
Client API Gateway
Service
Registry
Command
Query
DB
Event
Store
Event
Handler
DB
Fn Fn Fn

47. Reactor
Pattern

48. 48Event Loop
Event Loop

49. 49Workers
Worker
Worker
Worker
delegate long
running jobs & IO
callback
Event Loop

50. 50Multi-Reactor
Worker
Worker
Worker
delegate long
running jobs & IO
callback
Event
Bus

51. 51Event Handlers
Worker
Worker
Worker
delegate long
running jobs & IO
callback
Fn
Fn
Fn
Fn
Event
Bus

52. 52Basic Architecture
Worker
Worker
Worker
delegate long
running jobs & IO
callback
Fn
Client
Client
Client
Fn
Fn
Fn
request
response
Event
Bus

53. 53
Monolith
Evolution
App
App
App
App
App
App
App
App
Discovery & Configuration
Microservices
W
o
r
k
e
r
W
o
r
k
e
r
W
o
r
k
e
r
delegate
long
running
jobs & IO
callback
F
n
C
l
i
e
n
t
C
l
i
e
n
t
C
l
i
e
n
t
F
n
F
nF
n
request
response
E
v
e
n
t
B
u
s

54. 54Evolution
App
App
App
App
App
App
App
App
Discovery & Configuration
Monolith Reactive & DistributedMicroservices

55. 55Evolution
Module
Module
Module
Module
Module
Module
Module
Module
Discovery & Configuration
Monolith Reactive & DistributedMicroservices

56. 56Evolution
Module
Module
Module
Module
Module
Module
Module
Module
Discovery & Configuration
Distributed Platform
Monolith Reactive & DistributedMicroservices

57. 57Evolution
Module
Module
Module
Module
Module
Module
Module
Module
Discovery & Configuration
Fn
Distributed Platform
Monolith Reactive & DistributedMicroservices

58. 58Evolution
Module
Module
Module
Module
Module
Module
Module
Module
Discovery & Configuration
Fn
Client
Distributed Platform
Monolith Reactive & DistributedMicroservices

59. 59Evolution
Module
Module
Module
Module
Module
Module
Module
Module
Discovery & Configuration
Fn
Client
Fn
Distributed Platform
Monolith Reactive & DistributedMicroservices

60. 60Evolution
Module
Module
Module
Module
Module
Module
Module
Module
Discovery & Configuration
Fn
Client
Fn
?
Distributed Platform
Monolith Reactive & DistributedMicroservices

61. 61Evolution
Module
Module
Module
Module
Module
Module
Module
Module
Discovery & Configuration
Fn
Client
Fn
?
? ?
Distributed Platform
Monolith Reactive & DistributedMicroservices

62. 62Evolution
Module
Module
Module
Module
Module
Module
Module
Module
Discovery & Configuration
Fn
Client
Fn
?
? ?
HTTP
Distributed Platform
Monolith Reactive & DistributedMicroservices

63. 63Evolution
Module
Module
Module
Module
Module
Module
Module
Module
Discovery & Configuration
Fn
Client
Fn
?
? ?
? ?
Distributed Platform
Monolith Reactive & DistributedMicroservices
HTTP

64. 64Evolution
Module
Module
Module
Module
Module
Module
Module
Module
Discovery & Configuration
Fn
Client
Fn
?
? ?
? ?
Event
Bus
Distributed Platform
Monolith Reactive & DistributedMicroservices
HTTP

65. 65Evolution
Module
Module
Module
Module
Module
Module
Module
Module
Discovery & Configuration
Fn
Client
Fn
?
? ?
? ?
Event
Bus
Distributed Platform
Monolith Reactive & DistributedMicroservices
HTTP

66. 66Evolution
Module
Module
Module
Module
Module
Module
Module
Module
Discovery & Configuration
Fn
Client
Fn
?
? ?
? ?
Event
Bus
External
Apps
Distributed Platform
Monolith Reactive & DistributedMicroservices
HTTP

67. 67Evolution
Module
Module
Module
Module
Module
Module
Module
Module
Discovery & Configuration
Fn
Client
Fn
?
? ?
? ?
Event
Bus
External
Apps
IoT
Distributed Platform
Monolith Reactive & DistributedMicroservices
HTTP

68. 68Evolution
Module
Module
Module
Module
Module
Module
Module
Module
Discovery & Configuration
Fn
Client
Fn
?
? ?
? ?
Event
Bus
External
Apps
Cloud IoT
Distributed Platform
Monolith Reactive & DistributedMicroservices
HTTP

69. 69
Monolith
Evolution
Module
Module
Module
Module
Module
Module
Module
Module
Discovery & Configuration
Reactive & DistributedMicroservices
Distributed Platform
Fn
Client
Fn
?
? ?
? ?
Event
Bus
External
Apps
Polyglot
Cloud IoT
HTTP

70. Reactive Manifesto 70
Module
Module
Module
Module
Module
Module
Module
Module
Fn
Client
Fn
?
? ?
? ?
Event
Bus
External
AppsPolyglot
Cloud IoT
HTTP
Responsive
Message Driven
Elastic Resilient

71. Functions

72. 72Functions
Sales Database

73. 73Functions
Sales
HTTP
Database

74. 74Functions
Sales
HTTP
Database
MQ

75. 75Functions
Sales
HTTP HTTP
Database
MQ
Sales
HTTP HTTP
Database
MQ

76. 76Functions
Sales
HTTP HTTP
MQ
Database
MQ

77. 77Functions
Sales
HTTP HTTP
MQ
Database
MQ
Accounting
Discounts
Warehouse

78. Reactive & Distributed
Modern Application Architectures

79. Reactive & Distributed
Event Bus
79

80. Reactive & Distributed
Event Bus
80

81. Reactive & Distributed
Event Bus
Server 1 Server 2 Server 3 Server N...
81

82. Reactive & Distributed
Event Bus
Server 1 Server 2 Server 3 Server N...
82
Handler Handler Handler Handler Handler Handler

83. Reactive & Distributed
Event Bus
Server 1 Server 2 Server 3 Server N...
83
Module ModuleModule
Handler Handler Handler Handler Handler Handler

84. Reactive & Distributed 84
Event Bus
Server 1 Server 2 Server 3 Server N...
External
Apps
Data
Sources
Metrics Cloud
IoT
Devices
etc.
Module ModuleModule
Handler Handler Handler Handler Handler Handler

85. Reactive & Distributed 85
External
Apps
Data
Sources
Metrics Cloud
IoT
Devices
etc.
Module ModuleModule
Event Bus
Handler Handler Handler Handler Handler Handler
Server 1 Server 2 Server 3 Server N...

86. Thank You!
http://orkhan.io
http://fb.com/groups/reactive.distributed