Microservices ArchitectureRam Vijapurapu ~ @rvijapurapu

Agenda

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*Terms & conditions apply.

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Monolith

tl;dr ….

Microservice

The Quest for Modularity

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Sales Inventory Admin

Web/shop /inventory /admin Mobile

Controllers (& Services)shopSvc inventorySvc adminSvc

DAOs

Security Framework

NAPPY_SITE_DB

What if?

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Web/sales /inventory /admin Mobile

Controllers (& Services)shopSvc inventorySvc adminSvc

DAOs

Security Framework

IoT

Controllers (& Services)shopSvc inventorySvc adminSvc

buttonOrderSvc

BIG_F$_SITE_DB

What if?

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Web/sales /inventory /admin Mobile

Controllers (& Services)shopSvc inventorySvc adminSvc

DAOs

Security Framework

IoT

Controllers (& Services)shopSvc inventorySvc adminSvc

buttonOrderSvc

BIG_F$_SITE_DB

Something has to change….

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Micro ervicesto the rescue….

By Source, Fair use, https://en.wikipedia.org/w/index.php?curid=45003610

Is Microservices the new Hype?

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https://de.wikipedia.org/wiki/Datei:Back-to-the-future-logo.svg10

Let’s start at the very beginning“Even though the UNIX system introduces a number of innovative programs and

techniques, no single program or idea makes it work well. Instead, what makes it

effective is the approach to programming, a philosophy of using the computer.

Although that philosophy can’t be written down in a single sentence, at its heart is the

idea that the power of a system comes more from the

relationships among programs than from the

programs themselves. Many UNIX programs do quite trivial things in

isolation, but, combined with other programs, become general and useful tools.”

– Brian Kernighan and Rob Pike, The UNIX Programming Environment

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Let’s start at the very beginning

Write programs that do one

thing and do it well. Write

programs to work together. Write

programs to handle text streams, because that is a universal interface.

- Doug McIlroy, the inventor of Unix pipes

Read More: The Art of Unix Programming http://www.catb.org/~esr/writings/taoup/html/index.html 12

Whatever that means...

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So the secret ingredient is?

…..Data

Flow Based Programming….

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Flow Based Programming….

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Flow-based programming (FBP) is a programming

paradigm that defines applications as networks of

"black box" processes, which exchange data across

predefined connections by message passing, where

the connections are specified externally to the

processes.

Microservices in the wild….

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● Intents● Activities● Services● Broadcast Receivers● Listeners

Microservices in the wild….

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Just give me a definition, will ya!

The microservice architectural style is an approach to developing a

single application as a suite of small

services, each running in its own process and communicating with lightweight

mechanisms, often an HTTP resource API. These services are built around business

capabilities and independently deployable by fully automated deployment machinery.

There is a bare minimum of centralized management of these services, which may be

written in different programming languages and use different data storage

technologies. - James Lewis & Martin Fowler

Read More: Microservices a definition of this new architectural term http://martinfowler.com/articles/microservices.html 19

Isn’t that what SOA is?

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YesNO!

Maybe

Let’s backup a bit….

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Sales Inventory Admin

Web/sales /inventory /admin Mobile

Controllers (& Services)shopSvc inventorySvc adminSvc

DAOs

Security Framework

Building Castles

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Sales

/shop

SalesSvc

Shop DAO

Security

Inventory

/inventory

InventorySvc

Inventory DAO

Security

Admin

/admin

AdminSvc

Admin DAO

Security

The focus will be on communication

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Sales

/shop

SalesSvc

Shop DAO

Security

Inventory

/inventory

InventorySvc

Inventory DAO

Security

Admin

/admin

AdminSvc

Admin DAO

Security

The focus will be on communication

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Shop

/shop

SalesSvc

Shop DAO

Security

Inventory

/inventory

InventorySvc

Inventory DAO

Security

Admin

/admin

AdminSvc

Admin DAO

Security

API First

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Takes two to tango

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REST

ATTR: Ginny Huo, "Pass the Message," Copyright 2016. http://www.ginnyhuo.com/pass-the-message/

Message Queues

Sync vs Async

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So, are we just going to run one instance of each???

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Shop

/shop

SalesSvc

Shop DAO

Security

Inventory

/inventory

InventorySvc

Inventory DAO

Security

Admin

/admin

AdminSvc

Admin DAO

Security

Docker

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Containers

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Shop

Inventory

Admin

/shop

/inventory

/admin

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Enough talk, ….

Kung Fu Panda (2008) - http://www.imdb.com/title/tt0441773/