this is a repository for the modern backend meetup
link to the meetup recording: https://youtu.be/0nc9PsfzrkA
Created by [Niv Itzhaky] - Mentor & Backend expert
linked in- https://www.linkedin.com/in/nivitzhaky/
email- [email protected]
phone: 0525236451
FORK AND THEN CLONE:
https://github.com/nivitzhaky/modern-backend-meetup.git
use: start.spring.io
use: spring boot latest version
use: java 11
use group: com.handson
use artifact: backend
use: maven
use: spring web
use: lombok
use: spring actuator
after project downloaded open it in intellij and copy src and pom.xml to the project you cloned from git
change spring version in pom.xml to 2.5.2
run the project
check: http://localhost:8080/actuator/health
commit - initial version
controller/StudentsController.java
@RestController
@RequestMapping("/api/students")
public class StudentsController {
@RequestMapping(value = "", method = RequestMethod.GET)
public ResponseEntity<?> hello()
{
return new ResponseEntity<>("Hello World!", HttpStatus.OK);
}
}pom.xml
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.6.1</version>
</dependency><!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger2 -->
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.6.1</version>
</dependency>
config/SwaggerConfig.java
@Configuration
@EnableSwagger2
public class SwaggerConfig {
@Bean
public Docket api() {
return new Docket(DocumentationType.SWAGGER_2)
.select()
.apis(RequestHandlerSelectors.any())
.paths(PathSelectors.any())
.build();
}
}check: http://localhost:8080/swagger-ui.html#
commit - hello world
docker run -d -p 5432:5432 -v postgresdata:/var/lib/postgresql/data -e POSTGRES_PASSWORD=postgres postgres
docker ps
docker logs [containerid]
docker-compose.yml
version: "3"
services:
db:
image: postgres
environment:
POSTGRES_PASSWORD: postgres
ports:
- 5432:5432
volumes:
- ./data:/var/lib/postgresql/data
privileged: true
docker-compose up -d
connect with tableplus - hostname postgres
cat /etc/hosts
commit - with docker compose
pom.xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>6.1.5.Final</version>
</dependency>
application.properties
spring.datasource.url=jdbc:postgresql://postgres:5432/postgres
spring.datasource.username=postgres
spring.datasource.password=postgres
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.format_sql=true
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect
model/Student.java
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.hibernate.validator.constraints.Length;
import javax.persistence.*;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotEmpty;
import javax.validation.constraints.NotNull;
import java.io.Serializable;
import java.util.Date;
@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
@Entity
@Table(name="student")
public class Student implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy= GenerationType.AUTO)
private Long id;
@NotNull
@Column(nullable = false, updatable = false)
private Date createdAt = new Date();
@NotEmpty
@Length(max = 60)
private String fullname;
@Min(100)
@Max(800)
private Integer satScore;
@Min(30)
@Max(110)
private Double graduationScore;
@Length(max = 20)
private String phone;
@Length(max = 500)
private String profilePicture;
}commit - with spring data
repo/StudentRepository.java
public interface StudentRepository extends CrudRepository<Student,Long> {
}service/StudentService.java
@Service
public class StudentService {
@Autowired
StudentRepository repository;
public Iterable<Student> all() {
return repository.findAll();
}
public Optional<Student> findById(Long id) {
return repository.findById(id);
}
public Student save(Student student) {
return repository.save(student);
}
public void delete(Student student) {
repository.delete(student);
}
}model/StudentIn.java
import lombok.Data;
import org.hibernate.validator.constraints.Length;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import java.io.Serializable;
import java.util.Date;
@Data
public class StudentIn implements Serializable {
@Length(max = 60)
private String fullname;
@Min(100)
@Max(800)
private Integer satScore;
@Min(30)
@Max(110)
private Double graduationScore;
@Length(max = 20)
private String phone;
public Student toStudent() {
return Student.builder().createdAt(new Date()).fullname(fullname)
.satScore(satScore).graduationScore(graduationScore)
.phone(phone)
.build();
}
public void updateStudent(Student student) {
student.setFullname(fullname);
student.setSatScore(satScore);
student.setGraduationScore(graduationScore);
student.setPhone(phone);
}
}controller/StudentsController.java
@Autowired
StudentService studentService;
@RequestMapping(value = "", method = RequestMethod.GET)
public ResponseEntity<?> getAllStudents()
{
return new ResponseEntity<>(studentService.all(), HttpStatus.OK);
}
@RequestMapping(value = "/{id}", method = RequestMethod.GET)
public ResponseEntity<?> getOneStudent(@PathVariable Long id)
{
return new ResponseEntity<>(studentService.findById(id), HttpStatus.OK);
}
@RequestMapping(value = "", method = RequestMethod.POST)
public ResponseEntity<?> insertStudent(@RequestBody StudentIn studentIn)
{
Student student = studentIn.toStudent();
student = studentService.save(student);
return new ResponseEntity<>(student, HttpStatus.OK);
}
@RequestMapping(value = "/{id}", method = RequestMethod.PUT)
public ResponseEntity<?> updateStudent(@PathVariable Long id, @RequestBody StudentIn student)
{
Optional<Student> dbStudent = studentService.findById(id);
if (dbStudent.isEmpty()) throw new RuntimeException("Student with id: " + id + " not found");
student.updateStudent(dbStudent.get());
Student updatedStudent = studentService.save(dbStudent.get());
return new ResponseEntity<>(updatedStudent, HttpStatus.OK);
}
@RequestMapping(value = "/{id}", method = RequestMethod.DELETE)
public ResponseEntity<?> deleteStudent(@PathVariable Long id)
{
Optional<Student> dbStudent = studentService.findById(id);
if (dbStudent.isEmpty()) throw new RuntimeException("Student with id: " + id + " not found");
studentService.delete(dbStudent.get());
return new ResponseEntity<>("DELETED", HttpStatus.OK);
}commit - with students CRUD ####simple filter StudentRepository.java
List<Student> findAllBySatScoreGreaterThan(Integer satScore);StudentService.java
public List<Student> getStudentWithSatHigherThan(Integer sat) {
return repository.findAllBySatScoreGreaterThan(sat);
}StudentController.java
@RequestMapping(value = "/highSat", method = RequestMethod.GET)
public ResponseEntity<?> getHighSatStudents(@RequestParam Integer sat)
{
return new ResponseEntity<>(studentService.getStudentWithSatHigherThan(sat), HttpStatus.OK);
}####FPS
apply fps.patch
model/StudentOut:
import com.fasterxml.jackson.annotation.JsonInclude;
import lombok.Data;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.SqlResultSetMapping;
import java.util.Date;
@Data
@Entity
@SqlResultSetMapping(name = "StudentOut")
@JsonInclude(JsonInclude.Include.NON_NULL)
public class StudentOut {
@Id
private Long id;
private Date createdat;
private String fullname;
private Integer satscore;
private Double graduationscore;
private String phone;
private String profilepicture;
}model/StudentSortField.java
`public enum StudentSortField {
id("id") ,
createdAt ("created_at"),
fullName ("fullname"),
birthDate ("birth_date"),
satScore ("sat_score"),
graduationScore ("graduation_score"),
phone ("phone"),
profilepicture ("profile_picture");
public final String fieldName;
private StudentSortField(String fieldName) {
this.fieldName = fieldName;
}
}StudentsController.java
@Autowired
EntityManager em;
@Autowired
ObjectMapper om;
@RequestMapping(value = "", method = RequestMethod.GET)
public ResponseEntity<PaginationAndList> search(@RequestParam(required = false) String fullName,
@RequestParam(required = false) Integer fromGraduationScore,
@RequestParam(required = false) Integer toGraduationScore,
@RequestParam(required = false) Integer fromSatScore,
@RequestParam(required = false) Integer toSatScore,
@RequestParam(defaultValue = "1") Integer page,
@RequestParam(defaultValue = "50") @Min(1) Integer count,
@RequestParam(defaultValue = "id") StudentSortField sort, @RequestParam(defaultValue = "asc") SortDirection sortDirection) throws JsonProcessingException {
var res =aFPS().select(List.of(
aFPSField().field("id").alias("id").build(),
aFPSField().field("created_at").alias("createdat").build(),
aFPSField().field("fullname").alias("fullname").build(),
aFPSField().field("sat_score").alias("satscore").build(),
aFPSField().field("graduation_score").alias("graduationscore").build(),
aFPSField().field("phone").alias("phone").build(),
aFPSField().field("profile_picture").alias("profilepicture").build()
))
.from(List.of(" student s"))
.conditions(List.of(
aFPSCondition().condition("( lower(fullname) like :fullName )").parameterName("fullName").value(likeLowerOrNull(fullName)).build(),
aFPSCondition().condition("( graduation_score >= :fromGraduationScore )").parameterName("fromGraduationScore").value(fromGraduationScore).build(),
aFPSCondition().condition("( graduation_score <= :toGraduationScore )").parameterName("toGraduationScore").value(toGraduationScore).build(),
aFPSCondition().condition("( sat_score >= :fromSatScore )").parameterName("fromSatScore").value(fromSatScore).build(),
aFPSCondition().condition("( sat_score <= :toSatScore )").parameterName("toSatScore").value(toSatScore).build()
)).sortField(sort.fieldName).sortDirection(sortDirection).page(page).count(count)
.itemClass(StudentOut.class)
.build().exec(em, om);
return ResponseEntity.ok(res);
}commit - with FPS
apply one_to_many_grades.patch
Student.java
@OneToMany(mappedBy = "student", cascade = {CascadeType.PERSIST, CascadeType.REMOVE})
private Collection<StudentGrade> studentGrades = new ArrayList<>();StudentOut.java
private Double avgscore;StudentsController.java
@RequestMapping(value = "", method = RequestMethod.GET)
public ResponseEntity<PaginationAndList> search(@RequestParam(required = false) String fullName,
@RequestParam(required = false) Integer fromGraduationScore,
@RequestParam(required = false) Integer toGraduationScore,
@RequestParam(required = false) Integer fromSatScore,
@RequestParam(required = false) Integer toSatScore,
@RequestParam(required = false) Integer fromAvgScore,
@RequestParam(defaultValue = "1") Integer page,
@RequestParam(defaultValue = "50") @Min(1) Integer count,
@RequestParam(defaultValue = "id") StudentSortField sort, @RequestParam(defaultValue = "asc") SortDirection sortDirection) throws JsonProcessingException {
var res =aFPS().select(List.of(
aFPSField().field("s.id").alias("id").build(),
aFPSField().field("s.created_at").alias("createdat").build(),
aFPSField().field("s.fullname").alias("fullname").build(),
aFPSField().field("s.sat_score").alias("satscore").build(),
aFPSField().field("s.graduation_score").alias("graduationscore").build(),
aFPSField().field("s.phone").alias("phone").build(),
aFPSField().field("s.profile_picture").alias("profilepicture").build(),
aFPSField().field("(select avg(sg.course_score) from student_grade sg where sg.student_id = s.id ) ").alias("avgscore").build()
))
.from(List.of(" student s"))
.conditions(List.of(
aFPSCondition().condition("( lower(fullname) like :fullName )").parameterName("fullName").value(likeLowerOrNull(fullName)).build(),
aFPSCondition().condition("( graduation_score >= :fromGraduationScore )").parameterName("fromGraduationScore").value(fromGraduationScore).build(),
aFPSCondition().condition("( graduation_score <= :toGraduationScore )").parameterName("toGraduationScore").value(toGraduationScore).build(),
aFPSCondition().condition("( sat_score >= :fromSatScore )").parameterName("fromSatScore").value(fromSatScore).build(),
aFPSCondition().condition("( sat_score <= :toSatScore )").parameterName("toSatScore").value(toSatScore).build(),
aFPSCondition().condition("( (select avg(sg.course_score) from student_grade sg where sg.student_id = s.id ) >= :fromAvgScore )").parameterName("fromAvgScore").value(fromAvgScore).build()
)).sortField(sort.fieldName).sortDirection(sortDirection).page(page).count(count)
.itemClass(StudentOut.class)
.build().exec(em, om);
return ResponseEntity.ok(res);
}StudentSortField.java
id("s.id") ,
createdAt ("s.created_at"),
fullName ("s.fullname"),
satScore ("s.at_score"),
graduationScore ("s.graduation_score"),
phone ("s.phone"),
profilepicture ("s.profile_picture"),
avgScore (" (select avg(sg.course_score) from student_grade sg where sg.student_id = s.id ) ");commit - with one to many
apply dockerize.patch
run maven package ->SKIP THE TESTS
docker build . -t backend
in repository settings -> secrets, add
DOCKERHUB_USERNAME = nivitzhaky
DOCKERHUB_TOKEN = dckr_pat_wNsuA4lJiuBnc4iCsNCmxjCVjc4
docker login
nivitzhaky
Jul201789#
docker tag backend nivitzhaky/backend:002
docker-compose -f docker-compose-aws.yml up -d
sudo yum update -y
sudo yum install -y docker
sudo service docker start
sudo curl -L https://github.com/docker/compose/releases/download/1.22.0/docker-compose-$(uname -s)-$(uname -m) -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose
docker-compose
echo "
version: \"3\"
services:
appserver:
container_name: server
hostname: localhost
image: nivitzhaky/backend:001
ports:
- "8080:8080"
postgres:
image: postgres
environment:
POSTGRES_PASSWORD: postgres
ports:
- 5432:5432
volumes:
- ./data:/var/lib/postgresql/data
privileged: true
" >> docker-compose-aws.yml
sudo /usr/local/bin/docker-compose -f docker-compose-aws.yml up -d
if needed allow all traffic in security group
apply patch kubernetes.patch
https://labs.play-with-k8s.com/
yum install git -y
git clone https://github.com/nivitzhaky/modern-backend-meetup.git
cd modern-backend-meetup/src/main/resources/k8s
kubectl apply -f deployment-postgres.yml
kubectl apply -f postgres-service.yml
kubectl apply -f configmap.yml
kubectl apply -f deployment.yml
kubectl apply -f service.yml