Multithreading Lab

.idea/.gitignore

+# Default ignored files
+/shelf/
+/workspace.xml

.idea/Lab1.iml

+<?xml version="1.0" encoding="UTF-8"?>
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\ No newline at end of file

Multithreading/.gitignore

+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file

Multithreading/.idea/encodings.xml

+<?xml version="1.0" encoding="UTF-8"?>
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+  <component name="Encoding">
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\ No newline at end of file

Multithreading/.idea/misc.xml

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\ No newline at end of file

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\ No newline at end of file

Multithreading/.idea/vcs.xml

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Multithreading/.idea/workspace.xml

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\ No newline at end of file

Multithreading/Readme.md

+### Multithreading in Java
+
+*topics:*
+* Why Multithreading
+* Create Thread
+    - Thread class
+    - Runnable interface
+* Performance Optimization
+
+*Some Useful links:*
+- [Automation Test - Junit](https://www.tutorialspoint.com/junit/junit_test_framework.htm)
+- [Multithreading in Java](https://www.youtube.com/watch?v=F2TkIojBdws&list=PLXBkY9OPPGU4ahU1AVue3FMd3wNaZU9Fc&index=1&ab_channel=AlternativeDegree)

Multithreading/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.multithreading</groupId>
+    <artifactId>Multithreading</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13.2</version>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+</project>
\ No newline at end of file

Multithreading/src/main/java/org/multithreading/Main.java

+package org.multithreading;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Main {
+
+    public static void main(String[] args) {
+
+        List<StudentServiceThread> studentServiceThreadList = new ArrayList<>();
+
+        long startTime = System.currentTimeMillis();
+        for (int i = 0; i < 10; i++) {
+            Student student = new Student("test " + i);
+//            System.out.println("Current Thread: "+Thread.currentThread().getName());
+
+            StudentService studentService = new StudentService();
+            StudentServiceThread studentServiceThread = new StudentServiceThread(student, studentService);
+            studentServiceThread.start();
+            studentServiceThreadList.add(studentServiceThread);
+        }
+
+        for (StudentServiceThread studentServiceThread : studentServiceThreadList) {
+            try {
+                studentServiceThread.join();
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e);
+            }
+        }
+
+//        for (int i = 0; i < 10; i++) {
+//
+//            studentService.saveStudent(student);
+//        }
+        long duration = System.currentTimeMillis() - startTime;
+        System.out.println("Time Taken: " + duration);
+
+    }
+}
\ No newline at end of file

Multithreading/src/main/java/org/multithreading/Student.java

+package org.multithreading;
+
+public class Student {
+    private String name;
+
+    public Student(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

Multithreading/src/main/java/org/multithreading/StudentService.java

+package org.multithreading;
+
+import java.util.UUID;
+
+public class StudentService {
+
+    public String saveStudent(Student std) {
+        System.out.println("Saving Student: " + std.getName());
+        try {
+            Thread.sleep(1000);
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+        return UUID.randomUUID().toString();
+    }
+}

Multithreading/src/main/java/org/multithreading/StudentServiceRunnable.java

+package org.multithreading;
+
+public class StudentServiceRunnable implements Runnable {
+    private Student student;
+    private StudentService studentService;
+
+    public StudentServiceRunnable(Student student, StudentService studentService) {
+        this.student = student;
+        this.studentService = studentService;
+    }
+
+    @Override
+    public void run() {
+        System.out.println("Current Thread: " + Thread.currentThread().getName());
+        studentService.saveStudent(student);
+    }
+}

Multithreading/src/main/java/org/multithreading/StudentServiceThread.java

+package org.multithreading;
+
+public class StudentServiceThread extends Thread {
+
+    private Student student;
+    private StudentService studentService;
+
+    public StudentServiceThread(Student student, StudentService studentService) {
+        this.student = student;
+        this.studentService = studentService;
+    }
+
+    @Override
+    public void run() {
+        System.out.println("Current Thread: "+Thread.currentThread().getName());
+        studentService.saveStudent(student);
+    }
+}

Multithreading/src/test/java/StudentServiceTest.java

+import junit.framework.TestCase;
+import org.multithreading.Student;
+import org.multithreading.StudentService;
+import org.multithreading.StudentServiceRunnable;
+import org.multithreading.StudentServiceThread;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class StudentServiceTest extends TestCase {
+
+    public void testStudentService()
+    {
+        long StartTime= System.currentTimeMillis();
+        Student student = new Student("test");
+        StudentService svc = new StudentService();
+        svc.saveStudent(student);
+        long end = System.currentTimeMillis()- StartTime;
+
+        System.out.println("Time Taken: "+ end);
+    }
+
+    public void testMultiStudentService()
+    {
+        long StartTime= System.currentTimeMillis();
+        StudentService svc = new StudentService();
+
+        for (int i=0; i<10;i++) {
+            Student student = new Student("test "+i);
+            svc.saveStudent(student);
+        }
+        long end = System.currentTimeMillis()- StartTime;
+
+        System.out.println("Time Taken: "+ end);
+    }
+
+    public void testStudentServiceUsingThread()
+    {
+
+        long StartTime= System.currentTimeMillis();
+        System.out.println("The name of the current name is: "+ Thread.currentThread().getName());
+        StudentService svc = new StudentService();
+        Student student = new Student("test");
+        StudentServiceThread studentServiceThread = new StudentServiceThread(student, svc);
+        studentServiceThread.setName("MyTestThread");
+        studentServiceThread.start();
+//        studentServiceThread.run();
+        try {
+            studentServiceThread.join();
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+        long end = System.currentTimeMillis()- StartTime;
+
+        System.out.println("Time Taken: "+ end);
+    }
+
+    public void testStudentServiceUsingThreadsNotReally()
+    {
+        long StartTime= System.currentTimeMillis();
+        StudentService svc = new StudentService();
+        for (int i= 0; i<10;i++) {
+            Student student = new Student("test "+i);
+            StudentServiceThread studentServiceThread = new StudentServiceThread(student, svc);
+            studentServiceThread.setName("MyTestThread"+i);
+            studentServiceThread.start();
+            try {
+                studentServiceThread.join();
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e);
+            }
+        }
+//        studentServiceThread.run();
+
+        long end = System.currentTimeMillis()- StartTime;
+
+        System.out.println("Time Taken: "+ end);
+    }
+
+    public void testStudentServiceUsingThreads()
+    {
+        long StartTime= System.currentTimeMillis();
+        StudentService svc = new StudentService();
+        List<StudentServiceThread> studentServiceThreadList = new ArrayList<>();
+
+        for (int i= 0; i<10;i++) {
+            Student student = new Student("test "+i);
+            StudentServiceThread studentServiceThread = new StudentServiceThread(student, svc);
+            studentServiceThread.setName("MyTestThread"+i);
+            studentServiceThread.start();
+            studentServiceThreadList.add(studentServiceThread);
+
+        }
+//        studentServiceThread.run();
+
+        for(StudentServiceThread studentServiceThread: studentServiceThreadList){
+            try {
+                studentServiceThread.join();
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e);
+            }
+        }
+        long end = System.currentTimeMillis()- StartTime;
+
+        System.out.println("Time Taken: "+ end);
+    }
+
+    public void testStudentServiceUsingRunnable()
+    {
+
+        StudentService studentService = new StudentService();
+        Student student = new Student("test");
+
+        StudentServiceRunnable studentServiceRunnable = new StudentServiceRunnable(student, studentService);
+        Thread th = new Thread(studentServiceRunnable);
+        th.start();
+        try {
+            th.join();
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public void testStudentServiceUsingAnonymousRunnable()
+    {
+
+        StudentService studentService = new StudentService();
+        Student student = new Student("test");
+
+//        StudentServiceRunnable studentServiceRunnable = new StudentServiceRunnable(studentService,student);
+        Thread th = new Thread(new Runnable() {
+            @Override
+            public void run() {
+                studentService.saveStudent(student);
+            }
+        });
+        th.start();
+        try {
+            th.join();
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public void testStudentServiceUsingLambdaRunnable()
+    {
+
+        StudentService studentService = new StudentService();
+        Student student = new Student("test");
+
+//        StudentServiceRunnable studentServiceRunnable = new StudentServiceRunnable(studentService,student);
+        Thread th = new Thread(() -> studentService.saveStudent(student));
+        th.start();
+        try {
+            th.join();
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}

Readmed.md

+### Multithreading in Java
+
+*topics:*
+* Multithreading Lab 
+* Homework Question 2 Code