Architectural patterns for an API Centric architecture. We discuss the misconceptions around statelessness and the different components that allow for a flexible and reliable runtime based on REST APIs.

1. Patterns
For
API Centric
Architecture
Daniel Cerecedo
@dcerecedo

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StatelessStateless

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StatelessStateless
Client/Server

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StatelessStateless
It's all about CLIENT STATE,
not about the
global state of the system

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StatelessStateless
Client requests provide
ALL the context that
the Server needs to
Determine Client state

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StatelessStateless
The state of the client is part of the payload

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StatelessStateless
Stateless servers
are core to
HORIZONTAL SCALING

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CommonContractCommonContract
Exchange protocol
Message format

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CommonContractCommonContract
Exchange protocol
Message format
Coupling

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CommonContractCommonContract

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OrchestrationOrchestration
2
1
3

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OrchestrationOrchestration
2
1
3

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Mediation RouterMediation Router

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Mediation RouterMediation Router
Intelligently ROUTES and
TRANSFORMS messages, and
handles endpoint ERRORS

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Mediation RouterMediation Router
✔
Load Balancer
Specify a group of components among which to load balance requests
✔
Dead Letter
Declare error conditions, retry policies and where to deliver the message on failure
✔
Content Based Routing
Route a message to different endpoints based of its contents
✔
Dynamic Router
Route a message to different endpoints based on the state of the system
✔
Normalizer
Transform messages from heterogeneous formats into a common format

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Mediation RouterMediation Router

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Mediation RouterMediation Router

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Message BrokerMessage Broker
A Message Broker supports
ALL communication models:
✔
Publish/Subscribe
✔
Sync RPC
✔
Async RPC

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Message BrokerMessage Broker
A Message Broker
GUARANTEES the delivery
of a message

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Service RegistryService Registry
Netflix Eureka

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Service RegistryService Registry

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Load BalancerLoad Balancer
Netflix Ribbon

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Circuit BrakerCircuit Braker
Netflix Hystrix

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Service DiscoveryService Discovery

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Service DiscoveryService Discovery
Discovery client automatically resolvesservice names through the service registry

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Service DiscoveryService Discovery
Client load balancer caches service
instance locations to support service
resolution in case the registry failure

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Service DiscoveryService Discovery
Client load balancer selects a serviceinstance among all available

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Circuit BreakerCircuit Breaker
If we are unable to service a request we
can shortcircuit and fallback graciously

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Stateless
Service Discovery
Load Balancer
Circuit Braker
Micro Services


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Micro ServicesMicro Services
MywayMyway

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Micro ServicesMicro Services
MywayMyway

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ContainerizationContainerization

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ContainerizationContainerization
Strict separation between
build, release and run.
Releases are APPEND ONLY

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ContainerizationContainerization
Infrastructure is IMMUTABLE

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ContainerizationContainerization
Services are exported
via PORT BINDING

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ReferencesReferences
Spring Cloud
Using cloud components with spring, specially Netflix OSS
http://projects.spring.io/spring-cloud/
Flux Capacitor
Java-based, cloud-native, reference architecture using many Netflix Open Source projects
https://github.com/cfregly/fluxcapacitor
12 Factor APP
Methodology for building software-as-a-service apps
http://12factor.net/
Shipyard
Composable docker management
http://shipyard-project.com/

43. ?ThanksThanks
MerciMerci
GraciasGracias
http://byteflair.com
Daniel Cerecedo
@dcerecedo