chapter 4 : Component system

PL and AL

PL : presentation logic AL : application logic

technical architecture

allows to present a generalised view

which layer is the intermediate

application layer is the intermediate between data and presentation

web architecture: application

business logic

cloud architecture definition

cloud ERP is designed to help businesses manage their operations, processes and data. the software can be delivered through the Internet as a SAAS application. could based solutions are offered and managed in a vendor's cloud platform.

web architecture: data

database tier

SOA

every service has it's own API: internet or local,connect 2 machines protocols: SOAP and REST •application divided into different services •we can you it on any tech through web services

3 tier architecture: application tier

network security technique: firewalls between each layer to guard the traffic and systems allowed + intrusion detection systems

benefits of SOA

reusable services that we can apply to create new processus

modular architecture of an ERP

these modules independent of each other, share a commun database

web architecture: presentation layer

web browser: access web server: show interface

infrastructure requirement of ERP

•2 tier •3 tier •web based •SOA •cloud⬅️ SAAS same layers but the presentation of them is different

web based architecture

•3 tier + web based architecture •web tier=presentation tier split into : •web server •web browser ​

2 tier architecture

•adopt the client/server architecture •direct communication without intermediate •client:presentation layer •server:app and data layer

presentation layer

•allows client to connect to the application •self service portal to access and analyse information through their web browser

limitations of cloud ERP

•connectivity issues •vulnerability •data security •lack of ownership

benefits of web architecture

•cost saving •less expensive client software installation •client centric: better response time, hight performance

Application layer

•data entered and shared with other components •application programming interface API: connect modules to database: allows legacy/thirdparty application related web site to ERP

3 tier architecture: data tier

•data management, central repository, maintain the integrity •system components SQL

benefits of 2 tier architecture

•easy to use and access information •low cost •higher performance with limited number of work stations

limitations of SOA

•high bandwidth server •high cost

limitations of 3 tier ar

•high cost: firewalls, security between each layer •complexity to employ them

limitations of 2 tier architecture

•inflexible in terms of adding more clients and software

SOA service oriented architecture

•is an approach, model to implement, integrate in one platform •we use web services to apply SOA •integrate multiple apps that use different platforms •allows everyone to connect without delay or bug

benefits of cloud architecture

•no maintenance fees •accessed from everywhere •pay for subscription not for license and upgrades

there are 3 layers

•presentation layer •application layer •data layer

SOA architecture

•presentation layer •business logic layer •service layer •integration layer •data layer

limitations of web architecture

•reliable Internet connection •lacks security: client centric architecture

benefits of 3 tier architecture

•security: more security •reusability:reusable components •flexibility: more adaptable yo changes by separation PL from AL •scalability: easy to add,alter and delete apps from architecture

web architecture can be

•server centric: access app through application •client centric: local access/download app exp: Microsoft teams

ERP technical modules

•servers and peripherals •data management system •security module •operating systems

data layer

•structure of organisational data •SQL inquiry and report writer tools •where data will be stored •database access layer DAL include data dictionary: database ➡️ERP modules

cloud architecture info

•the user is shown the presentation layer •2 tier ERP •transactions between user and ERP is done with OLTP online transaction process •transaction based application

layered architecture of ERP

•web based user interface •java enabled web browser connected to intranet + Internet •java virtual machine interface (c/s) ⬇️➡️ verification/gives access to the application ⬇️➡️secure access SSL ⬇️➡️if access given, open interface •application software layer ASL

3 tier architecture: web tier

•web tier includes web servers •graphical user interface GUI •located and accessed within internal network or externally

choosing a suitable architecture

•work with IT staff in selecting the architecture •specify the budget and limits •determine 2 tier or 3 tier