NFJS 2015 Migrating to Microservices - SDD...

Software Design and Development Conference 2015

Mark RichardsHands-on Software ArchitectAuthor of Enterprise Messaging Video Series (O’Reilly)Author of Java Message Service 2nd Edition (O’Reilly)Co-author of Software Architecture Fundamentals Video Series (O'Reilly)

Migrating to a Microservices Architecture

Software Architecture Fundamentals Video Series Enterprise Messaging Video Series

microservices architecture elements

agenda

migration challengesmicroservices hybrid models

migration techniques

Microservices Architecture Elements

microservices elements

api layer

client requests client requests client requests

distributed architecture

api layer

separately deployed units

api layer

service component

api layer

bounded context

api layer

microservices hybrid models

databasescope

service granularity

integration hub

microservices hybrids

api layer

microservices hybridsservice granularity

user interface layer

microservices hybridsservice granularity

single-purpose micro-service to "portion of the application" macro-service

service granularity

macro-services resolves orchestration and transactional issues

allows for complex business processing within a service context

single-purpose micro-service to "portion of the application" macro-service

service granularity

services become harder to develop and testdeployment pipeline requires more planningchange control becomes more difficult

microservices hybridsdatabase scope

api layer

single-purpose service-based database to globally shared application database

reduces service orchestration and contract dependencies

improves performance due to fewer remote callsrefactoring entire database may not be feasible or possible

single-purpose service-based database to globally shared application database

looser bounded context of servicestighter service coupling based on schema

schema changes become expensive and difficult

microservices hybridsintegration hub

api layer

lightweight message broker

integration hub / middleware

lightweight message broker to heavier integration hub

allows for transformation of contract differences allows for non-transactional orchestration of servicesallows for protocol-agnostic heterogeneous interoperabilityallows for common processing logic across all services

lightweight message broker to heavier integration hub

decrease in overall performanceadded complexity and costincreased need for governancedeployment pipeline requires much more planning

services become harder to develop and test-

microservices migration challenges

migration challenges

distributed architecture and remote service issues

service component granularity and transactional boundaries

shared services, modules, and object hierarchies

distributed architecture issues

contract creation, maintenance, versioning, and coordination

distributed architecture issues

remote process responsiveness and server availability

distributed architecture issuesmigration challenges

slower service invocations due to remote access protocols and distributed

components

atomic transactions and transaction scope

authenticating and authorizing remote connections and service invocations

distributed logging facilities to provide a holistic view of a transaction

service component granularitymigration challenges

module module module module module

coarse-grained service components address transactional issues but may not achieve your desired goals

fine-grained service components may lead to too much orchestration and inter-dependency between service components

business functionality groupingstransactional boundariesdeployment goalsscalability needs

shared components and object hierarchiesmigration challenges

module module module

abstract

shared

inheritance structure

shared modules (utility and service classes)

module module module

abstract

shared

inheritance structure

shared modules (utility and service classes)

modulemodule module module

module

module module

modules can be split....

module module

module

or moved into a shared library or jar file...

module

or replicated in each service component

module module

module

module module

shared lib or jar file

application business layer

module module

modulemodule module

module module

module

migration challengesshared components and object hierarchies

migration challengesshared component techniques

jar /dll (compile or runtime)

shared library (compile time)

code replication remote services

playbook approach

current state iteration 1 iteration 2 iteration 3

each iteration should clearly illustrate the changes to the architecture each step along the way

playbook approach

current state iteration 1 iteration 2 iteration 3

identify the purpose behind each iteration

identify the technical and business value for each iteration

keep iterations as small as possible while still providing enough technical and business value

try to minimize "staging iterations"

form a logical or physical separation between the user interface layer and the business layer

user interface separationmigration techniques

CustomerData

AccountData

TradeData

ReportData

IDataModel

CustomerUI

AppClient

AccountUI TradeUI ReportUI

Customer Account Trade Report

user interface layer CustomerUI

AppClient

model.jar

model.jarCustomerData

AccountData

TradeData

ReportData

IDataModel

service migrationmigration techniques

AppClient

model.jar

AppClient

ReportTrade

model.jar

Customer Account

model.jar

CustomerListener

Customer Account

AppClient

ReportTrade

model.jar

Customer Account

model.jar

CustomerListener

AppClient

AccountUI TradeUI ReportUImodel.jar

Customer Account

CustomerListener

model.jar

TradeListener

model.jar

Report

ReportListener

model.jar

Migrating to a Microservices Architecture

Independent ConsultantHands-‐on So*ware ArchitectPublished Author / Conference Speaker

Mark Richards

h<p://www.wmrichards.comh<p://www.linkedin.com/pub/mark-‐richards/0/121/5b9

NFJS 2015 Migrating to Microservices - SDD...

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