Monolithic Architecture

Monolith means composed all in one piece. The Monolithic application describes a single-tiered software application in which different components combined into a single program from a single platform. Components can be:

Authorization — responsible for authorizing a user
Presentation — responsible for handling HTTP requests and responding with either HTML or JSON/XML (for web services APIs).
Business logic — the application’s business logic.
Database layer — data access objects responsible for accessing the database.
Application integration — integration with other services (e.g. via messaging or REST API). Or integration with any other Data sources.
Notification module — responsible for sending email notifications whenever needed.

Example for Monolithic Approach

Consider an example of Ecommerce application, that authorizes customer, takes an order, check products inventory, authorize payment and ships ordered products. This application consists of several components including e-Store User interface for customers (Store web view) along with some backend services to check products inventory, authorize and charge payments and shipping orders.

Image for post — Monolithic Architecture

Despite having different components/modules/services, the application is built and deployed as one Application for all platforms (i.e. desktop, mobile and tablet) using RDBMS as a data source. Benefits and Drawbacks of Monolithic Architecture.

1. Monolithic architecture

2. Layerd archtecture.

3. Virtual machine architecture

4. Exokernel architecture

5. Client server architecture

Micro kernel architecture

Benefits:

Simple to develop — At the beginning of a project it is much easier to go with Monolithic Architecture.
Simple to test. For example, you can implement end-to-end testing by simply launching the application and testing the UI with Selenium.
Simple to deploy. You have to copy the packaged application to a server.
Simple to scale horizontally by running multiple copies behind a load balancer.

Drawbacks:

Maintenance — If Application is too large and complex to understand entirely, it is challenging to make changes fast and correctly.
The size of the application can slow down the start-up time.
You must redeploy the entire application on each update.
Monolithic applications can also be challenging to scale when different modules have conflicting resource requirements.
Reliability — Bug in any module (e.g. memory leak) can potentially bring down the entire process. Moreover, since all instances of the application are identical, that bug impact the availability of the entire application
Regardless of how easy the initial stages may seem, Monolithic applications have difficulty to adopting new and advance technologies. Since changes in languages or frameworks affect an entire application, it requires efforts to thoroughly work with the app details, hence it is costly considering both time and efforts.

Comments

Defination of OS(operating system) and its concepts

What do you mean by operating system? Definition : An operating system is a program that act as an interface between the user of a computer and the Computer hardware. Operating system is a first program that gets loaded into the memory through a process called booting. Concepts of operating system : · The purpose of operating system is to provide an environment in which a user can execute program in a convenient and efficient manner. · Operating system is an integrated set of program that manages the various hardware resources such as processor, memory, I/O Devices , communication devices and overall operation of a computer system. · Operating systems also acts as a platform on which various applications programs such as word processor and excel are executed. · The most common operating system are the window family of operating system (windows 98, window

Multi Level Queue Scheduling (MLQ)

Multi Level Queue Scheduling (MLQ) · Multilevel queue scheduling classifies the processes according to their types for example, a multilevel queue scheduling algorithm makes a common. · In this scheduling ready queue is divided into various queue that are called sub queues. A subqueue is a distinct operational queue · The process are permanently assigned to subqueues, generally based on some property of the process such as memory size,priority or process type · Each subqueue has its process sucheduling algorithm. For example interactive process at the foreground may use round robin scheduling while batch jobs at the background may use the FCFS method · For example, consider a system with four different queues 1. System processes 2. Interactive processes 3. End-user processes 4. Interactive processes · In this example, each queue has absolute priority absolute over low priority queues

Direct Communicationand Indirect communication

Direct Communication · Direct communication establishes a link between two processes. A communication link is a unidirectional path along which information flows. · two processes use single communication link to share information. · In this metod, there cannot be more that one link between two processes direct communication · Send and receive function used in direct communication are given below : · Send(process name , message ,(receive(process name , message) Send(A, message )- send a message to process A Receive(A, message )-receive a message from process B Indirect communication · In indirect communication , no direct communication link exists between two processes. · In this , messages are sent to and received from mailbox. · A mailbox is a specialized repository where message can be placed by processes and from

Multitasking System

Multitasking system · Technically , multitasking is same as multi programming · In a multitasking operating system, s single user can execute multiple programs at the same time · We can also say, multitasking is the system capability to work on more than one job or process at the same time. · It means that whenever a job needs to perform I/O operation, the cpu can be used for execting some other job diagram of multi tasking · There are two type of multitasking : 1. Cooperative multitaskin g 2. Preemptive multitasking · Co operative multitasking in cooperative multitasking , program can aquire the cpu for the required amount of time a program canshare CPU with any other program that is executing simultaneously, if it does not currently require the CPU. · Preemptive multitasking . In preemptive multitasking the operating system allocat

ENTERPROCESS COMMUNICATION AND SYNCHRONIZATION

ENTERPROCESS COMMUNICATION AND SYNCHRONIZATION · In multi programming environment multiple process co-exit . a single program may be broken into number of processes. · The process are classified into two categories : independent processes and cooperating processes. · An independent process is a standalone process that does not share any data with any other process. It cannot affect or be affected by the other processes executing in the system. In other words, the modification made to an independent process does not affect the functioning of other process. · A cooperating processes is a process that shares data with other processes in a system it can affect or be affectedly the other processes executing in the system · Cooperating processes can communicate in a shred memory environment . · The various reasons for using cooperating processes are: 1. Information sharing : when several users want to acce

Easytolearn

Search This Blog