Skip to main content

2_Factory Design Pattern

Factory design pattern, Super class having multiple subclasses, create object of the subclass based on the input/requirement.
We create Factory class that take the responsibility of creating object of the subclass.

Super class will represent things so, you have to design it will be abstract class or interface.

Things to consider before making object using client class.
1) Object should be created with loose coupling.
2) Create object based on input dynamically.

Implement with code, here is the scenario. 
1) We have Interface of Employee declaring a method salary.
2) Now make two subclasses names WebDeveloper, AndroidDeveloper that defining the salary method and return employee salary.
3) We have master abstract class named as FactoryEmployee having static method getEmployee that receive an string type argument. based on argument there is an if condition to create object of spacific class of WebDeveloper or AndroidDeveloper. 
4) Now We have an  DeveloperClient class which want the salary information of the WebDeveloper or
DeveloperClient class. Now from DeveloperClient class method call FactoryEmployee class method getEmployee with argument let say "web developer".

5) Create Object
Now in FactoryEmplyee method there are if condition make on argument specific condition will true and return the new object of class WebDeveloper or AndroidDeveloper.

Benefits
No need to create objects(tightly coupled) only create based on requirement.
Focus on creating object for interface bcz we don't have concern with Employee(child classess/subclasses) classes. DeveloperClient class ask FactoryEmployee to give information of web developer class.
You just tel the factory class to create object, now further that his responsibility how he will create object.
Loose cpupling, robust code (No reasons to break code at run time.)

Real Time Application where this design pattern can be use.
1) Payment Method
User can be asked to choose payment method before making online payment transaction.

2) Database connection.
Database connection can be establish based on type/nature of data you want to store.

3) Notification alert subscription.
User may ask to get notification via SMS, Email or via Push Notification.

4) Vehicle manufacturing system.
Bike, Cars, Truck manufectured in the company now you can get information of specific vehicle information.

Comments

Post a Comment

Popular posts from this blog

Install MariaDB Latest Version 11.4 in Red Hat Version 9

 This this post i will show you step by step the installation process of mariaDB in red hat version 9. Step1 Run the command to pull the latest updated packages on applications installed in your system. -dnf update If you get Kernal update than reboot the system -reboot Step2 Go to official mariaDB site Make mariadb repository in /etc/yum.repos.d Place the configuration in this file # MariaDB 11.4 RedHatEnterpriseLinux repository list - created 2024-09-24 11:12 UTC # https://mariadb.org/download/ [mariadb] name = MariaDB # rpm.mariadb.org is a dynamic mirror if your preferred mirror goes offline. See https://mariadb.org/mirrorbits/ for details. # baseurl = https://rpm.mariadb.org/11.4/rhel/$releasever/$basearch baseurl = https://mirrors.aliyun.com/mariadb/yum/11.4/rhel/$releasever/$basearch # gpgkey = https://rpm.mariadb.org/RPM-GPG-KEY-MariaDB gpgkey = https://mirrors.aliyun.com/mariadb/yum/RPM-GPG-KEY-MariaDB gpgcheck = 1 Now install the mariaDB with its dependencies package...
Post a Comment
Read more

Redis installation in Red Hat Linux

 In this post we will see step by step installation of Redis service in Redhat/CentOS operation system. To install Redis, run this command in terminal -dnf install redis This command will install the redis service in your machine. Verify installation -systemctl status redis -systemctl start redis -systemctl enable redis Note: Before start redis service set Linux Kernal overcommit memory to 1 by adding vm.overcommit_memory = 1 to /etc/sysctl.conf file. Why we should do that: As we know redis is in memory data store. It primarily uses RAM to store data. Redis and other processes use RAM memory. We set vm.overcommit_memory = 1 to make sure Kernal not overcommit the memory by allocating memory to new program which required more memory than available memory. In this scenario OOM (Out Of Memory) killer terminate the rest of processes. We also restricting Kernal not to terminate the important services running and also stop swapping redis and other importance service to device i/o device,...
Post a Comment
Read more

Prepared statements, form submission, form validation and displaying errors in php

PHP Code. Insert statement Query. INSERT INTO `users`(`user_id`, `user_first`, `user_last`, `user_email`, `user_uid`, `user_pwd`) VALUES (1,'Adnan','Zaib','text@.com','Admin',1234) What are Prepared statements and how to use them //Created a sql prepare template $sql = "SELECT * FROM users WHERE user_uid=?;"; //than send to database with certain values left(unspecified parameters). //Create a prepared statement $stmt = mysqli_stmt_init($conn);   //prepare the prepared statement if(!mysqli_stmt_prepare($stmt, $sql)){ echo "sql statement failed"; }else{ //bind values to parameters and further to placeholder mysqli_stmt_bind_param(#stmt, "s",); // ‘s’ stands for datatype of parameter that you are going to pass. }   while($row = mysqli_fetch_assoc($result)){ echo $row['user_uid'] . "<br>"; } PHP form Validation   <?php // define variables and set to empty values $name = $email = $gender = $comment = ...
Post a Comment
Read more