Committing the changes

.gitignore

+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.4.3</version>
+		<relativePath /> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>com.poc</groupId>
+	<artifactId>mongodb-poc</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>Mongo DB POC</name>
+	<description>Demo project for Spring Boot and Mongo with Kafka</description>
+	<properties>
+		<java.version>1.8</java.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-mongodb</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-validation</artifactId>
+			<scope>compile</scope>
+			<exclusions>
+				<exclusion>
+					<artifactId>tomcat-embed-el</artifactId>
+					<groupId>org.apache.tomcat.embed</groupId>
+				</exclusion>
+			</exclusions>
+		</dependency>
+
+
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+
+		</plugins>
+	</build>
+
+</project>

src/main/java/com/poc/SimplePocApplication.java

+package com.poc;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SimplePocApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SimplePocApplication.class, args);
+	}
+
+}

src/main/java/com/poc/controller/EmployeeController.java

+package com.poc.controller;
+
+import java.util.List;
+
+import javax.validation.Valid;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.poc.entity.Employee;
+import com.poc.model.Emp;
+import com.poc.service.EmployeeService;
+
+@RestController
+@RequestMapping(path = "/employees")
+@Validated
+public class EmployeeController {
+	@Autowired
+	private EmployeeService employeeService;
+
+	@GetMapping(produces = "application/json", consumes = "application/json", path = "/empId/{empId}")
+	public ResponseEntity<Emp> findByEmpId(@Valid @PathVariable Long empId) {
+		return new ResponseEntity<>(employeeService.findByEmpId(empId), HttpStatus.OK);
+	}
+
+	@GetMapping(produces = "application/json", consumes = "application/json", path = "/")
+	public ResponseEntity<List<Emp>> findAll() {
+		return new ResponseEntity<>(employeeService.findAll(), HttpStatus.OK);
+	}
+	
+	@GetMapping(produces = "application/json", consumes = "application/json", path = "/id/{id}")
+	public ResponseEntity<Emp> findById(@Valid @PathVariable String id) {
+		return new ResponseEntity<>(employeeService.findById(id), HttpStatus.OK);
+	}
+
+	@GetMapping(produces = "application/json", consumes = "application/json", path = "/sal/{sal}")
+	public ResponseEntity<List<Emp>> findBySal(@Valid @PathVariable Double sal) {
+		return new ResponseEntity<>(employeeService.findBySalary(sal), HttpStatus.OK);
+	}
+	
+	@PostMapping(produces = "application/json", consumes = "application/json", path = "/upsert")
+	public ResponseEntity<Emp> saveOrUpdateEmployee(@Valid @RequestBody Emp emp) {
+		employeeService.saveOrUpdate(emp);
+		return new ResponseEntity<>(HttpStatus.OK);
+	}
+	
+	@PostMapping(produces = "application/json", consumes = "application/json", path = "/save")
+	public ResponseEntity<Emp> saveEmployee(@Valid @RequestBody Emp emp) {
+		return new ResponseEntity<>(employeeService.save(emp), HttpStatus.OK);
+	}
+
+	@DeleteMapping(produces = "application/json", consumes = "application/json", path = "/delete/{empId}")
+	public ResponseEntity<Long> deleteByEmpId(@PathVariable Long empId) {
+		return new ResponseEntity<>(employeeService.deleteByEmpId(empId), HttpStatus.OK);
+	}
+}

src/main/java/com/poc/entity/Employee.java

+package com.poc.entity;
+
+import org.springframework.data.annotation.Id;
+import org.springframework.data.mongodb.core.mapping.Document;
+import org.springframework.data.mongodb.core.mapping.Field;
+
+@Document(collection = "employee")
+public class Employee {
+	@Id
+	private String _id;
+	@Field(name = "emp_id")
+	private Long empId;
+	@Field(name = "emp_name")
+	private String empName;
+	@Field(name = "emp_sal")
+	private Double empSal;
+	@Field(name = "dept_id")
+	private String deptId;
+	@Field(name = "dept_name")
+	private String deptName;
+
+	public Employee() {
+		super();
+	}
+
+	/**
+	 * @return the _id
+	 */
+	public String get_id() {
+		return _id;
+	}
+
+	/**
+	 * @param _id the _id to set
+	 */
+	public void set_id(String _id) {
+		this._id = _id;
+	}
+
+	/**
+	 * @return the empId
+	 */
+	public Long getEmpId() {
+		return empId;
+	}
+
+	/**
+	 * @param empId the empId to set
+	 */
+	public void setEmpId(Long empId) {
+		this.empId = empId;
+	}
+
+	/**
+	 * @return the empName
+	 */
+	public String getEmpName() {
+		return empName;
+	}
+
+	/**
+	 * @param empName the empName to set
+	 */
+	public void setEmpName(String empName) {
+		this.empName = empName;
+	}
+
+	/**
+	 * @return the empSal
+	 */
+	public Double getEmpSal() {
+		return empSal;
+	}
+
+	/**
+	 * @param empSal the empSal to set
+	 */
+	public void setEmpSal(Double empSal) {
+		this.empSal = empSal;
+	}
+
+	/**
+	 * @return the deptId
+	 */
+	public String getDeptId() {
+		return deptId;
+	}
+
+	/**
+	 * @param deptId the deptId to set
+	 */
+	public void setDeptId(String deptId) {
+		this.deptId = deptId;
+	}
+
+	/**
+	 * @return the deptName
+	 */
+	public String getDeptName() {
+		return deptName;
+	}
+
+	/**
+	 * @param deptName the deptName to set
+	 */
+	public void setDeptName(String deptName) {
+		this.deptName = deptName;
+	}
+
+}

src/main/java/com/poc/mapper/EmployeeMapper.java

+package com.poc.mapper;
+
+import java.util.Optional;
+
+import org.springframework.stereotype.Component;
+
+import com.poc.entity.Employee;
+import com.poc.model.Emp;
+@Component
+public class EmployeeMapper implements EntityMapper {
+
+	@Override
+	public Object mapPojoToEntity(Object pojo) {
+		Optional<Object> obj=Optional.ofNullable(pojo);
+		if(obj.isPresent()) {
+			Emp emp=(Emp)pojo;
+			Employee employee=new Employee();
+			employee.setDeptId(emp.getDeptId());
+			employee.setDeptName(emp.getDeptName());
+			employee.setEmpId(emp.getEmpId());
+			employee.setEmpName(emp.getEmpName());
+			employee.setEmpSal(emp.getEmpSal());
+			return employee;
+		}
+		return null;
+	}
+
+	@Override
+	public Object mapEntityToPojo(Object entity) {
+		Optional<Object> obj=Optional.ofNullable(entity);
+		if(obj.isPresent()) {
+			Employee employee=(Employee)entity;
+			Emp emp=new Emp();
+			emp.setDeptId(employee.getDeptId());
+			emp.setDeptName(employee.getDeptName());
+			emp.setEmpId(employee.getEmpId());
+			emp.setEmpName(employee.getEmpName());
+			emp.setEmpSal(employee.getEmpSal());
+			
+			return emp;
+		}
+		return null;
+	}
+
+}

src/main/java/com/poc/mapper/EntityMapper.java

+package com.poc.mapper;
+
+public interface EntityMapper {
+	public Object mapPojoToEntity(Object pojo);
+
+	public Object mapEntityToPojo(Object entity);
+}

src/main/java/com/poc/model/Emp.java

+package com.poc.model;
+
+import javax.validation.constraints.NotNull;
+public class Emp {
+	@NotNull(message = "empID should not be null")
+	private Long empId;
+	@NotNull(message = "empName should not be null")
+	private String empName;
+	@NotNull(message = "empSal should not be null")
+	private Double empSal;
+	@NotNull(message = "deptId should not be null")
+	private String deptId;
+	@NotNull(message = "deptName should not be null")
+	private String deptName;
+
+	public Emp() {
+		super();
+	}
+
+	/**
+	 * @return the empId
+	 */
+	public Long getEmpId() {
+		return empId;
+	}
+
+	/**
+	 * @param empId the empId to set
+	 */
+	public void setEmpId(Long empId) {
+		this.empId = empId;
+	}
+
+	/**
+	 * @return the empName
+	 */
+	public String getEmpName() {
+		return empName;
+	}
+
+	/**
+	 * @param empName the empName to set
+	 */
+	public void setEmpName(String empName) {
+		this.empName = empName;
+	}
+
+	/**
+	 * @return the empSal
+	 */
+	public Double getEmpSal() {
+		return empSal;
+	}
+
+	/**
+	 * @param empSal the empSal to set
+	 */
+	public void setEmpSal(Double empSal) {
+		this.empSal = empSal;
+	}
+
+	/**
+	 * @return the deptId
+	 */
+	public String getDeptId() {
+		return deptId;
+	}
+
+	/**
+	 * @param deptId the deptId to set
+	 */
+	public void setDeptId(String deptId) {
+		this.deptId = deptId;
+	}
+
+	/**
+	 * @return the deptName
+	 */
+	public String getDeptName() {
+		return deptName;
+	}
+
+	/**
+	 * @param deptName the deptName to set
+	 */
+	public void setDeptName(String deptName) {
+		this.deptName = deptName;
+	}
+
+}

src/main/java/com/poc/repository/EmpMongoRepository.java

+package com.poc.repository;
+
+
+import java.util.stream.Stream;
+
+import org.springframework.data.mongodb.repository.MongoRepository;
+import org.springframework.data.mongodb.repository.Query;
+import org.springframework.stereotype.Repository;
+
+import com.poc.entity.Employee;
+@Repository
+public interface EmpMongoRepository extends MongoRepository<Employee, String> {
+	@Query(value="{emp_id : ?0}",sort = "{emp_id : 1}")
+	public Employee findByEmpId(Long empId);
+	/**
+	 * -1 -decending
+	 * 1 ascending
+	 * @param salary
+	 * @return
+	 */
+	@Query(value="{emp_sal : {$gte: ?0}}",sort = "{emp_sal : -1}")
+	public Stream<Employee> findBySalary(Double salary);
+	
+	@Query(value = "{emp_id : ?0}", delete = true)
+	public Long deleteByEmployeeId(Long empId); 
+	
+}

src/main/java/com/poc/repository/EmpRepository.java

+package com.poc.repository;
+
+import java.util.List;
+
+import com.poc.entity.Employee;
+
+public interface EmpRepository  {
+
+	public List<Employee> findAll();
+	public Employee findById(String id);
+	public Employee save(Employee e);
+	public void saveOrUpdate(Employee e);
+}

src/main/java/com/poc/repository/EmpRepositoryImpl.java

+package com.poc.repository;
+
+import java.util.List;
+
+import org.bson.Document;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.mongodb.core.MongoTemplate;
+import org.springframework.data.mongodb.core.query.Criteria;
+import org.springframework.data.mongodb.core.query.Query;
+import org.springframework.data.mongodb.core.query.Update;
+import org.springframework.stereotype.Repository;
+
+import com.mongodb.client.result.UpdateResult;
+import com.poc.entity.Employee;
+@Repository
+public class EmpRepositoryImpl implements EmpRepository {
+	private static final Logger logger = LoggerFactory.getLogger(EmpRepositoryImpl.class);
+	@Autowired
+	private MongoTemplate mongoTemplate;
+
+	@Override
+	public List<Employee> findAll() {
+		return mongoTemplate.findAll(Employee.class);
+	}
+
+	@Override
+	public Employee findById(String id) {
+		Query query = new Query();
+		query.addCriteria(Criteria.where("emp_id").is(id));
+		return mongoTemplate.findOne(query, Employee.class);
+	}
+
+	@Override
+	public Employee save(Employee e) {
+		return mongoTemplate.save(e);
+	}
+
+	@Override
+	public void saveOrUpdate(Employee e) {
+	    Query query = new Query();
+	    query.addCriteria(Criteria.where("emp_id").is(e.getEmpId()));
+
+	    Document doc = new Document();
+	    mongoTemplate.getConverter().write(e, doc);
+	    Update update = Update.fromDocument(doc);
+
+	    UpdateResult result=mongoTemplate.upsert(query, update, Employee.class);
+	    result.getMatchedCount();
+	    logger.info("Matched Count:{},{}",result.getMatchedCount(),e.getEmpId());
+	}
+
+	
+}

src/main/java/com/poc/service/EmployeeService.java

+package com.poc.service;
+
+import java.util.List;
+
+import com.poc.entity.Employee;
+import com.poc.model.Emp;
+
+public interface EmployeeService {
+	
+	public Emp findByEmpId(Long empId);
+	public Emp findById(String id);
+	public List<Emp> findAll();
+	public Emp save(Emp emp);
+	public void saveOrUpdate(Emp emp);
+	public List<Emp> findBySalary(Double sal);
+	public Long deleteByEmpId(Long empId);
+
+}

src/main/java/com/poc/service/EmployeeServiceImpl.java

+package com.poc.service;
+
+import java.awt.print.Book;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import com.poc.entity.Employee;
+import com.poc.mapper.EmployeeMapper;
+import com.poc.model.Emp;
+import com.poc.repository.EmpMongoRepository;
+import com.poc.repository.EmpRepository;
+
+@Service
+public class EmployeeServiceImpl implements EmployeeService {
+
+	@Autowired
+	private EmpMongoRepository empMongoRepository;
+	@Autowired
+	private EmployeeMapper employeeMapper;
+	@Autowired
+	private EmpRepository empRepository;
+
+	@Override
+	public Emp findByEmpId(Long empId) {
+		return (Emp)employeeMapper.mapEntityToPojo(empMongoRepository.findByEmpId(empId));
+	}
+
+	@Override
+	public Emp findById(String id) {
+		return (Emp)employeeMapper.mapEntityToPojo(empMongoRepository.findById(id).orElse(new Employee()));
+	}
+
+	@Override
+	public List<Emp> findAll() {
+		List<Employee> list= empMongoRepository.findAll();
+		List<Emp> empList= list.stream()
+				.map(e->employeeMapper.mapEntityToPojo(e))
+				.map(e->(Emp)e)
+				.collect(Collectors.toList());
+		return empList;
+	}
+
+	@Override
+	public Emp save(Emp emp) {
+		Employee employee = (Employee) employeeMapper.mapPojoToEntity(emp);
+		return (Emp)employeeMapper.mapEntityToPojo(empMongoRepository.save(employee));
+	}
+
+	@Override
+	public void saveOrUpdate(Emp emp) {
+		Employee employee = (Employee) employeeMapper.mapPojoToEntity(emp);
+		empRepository.saveOrUpdate(employee);
+
+	}
+
+	@Override
+	public List<Emp> findBySalary(Double sal) {
+		List<Emp> empList= null;
+		try (Stream<Employee> stream = empMongoRepository.findBySalary(sal)) {
+			List<Employee> list = stream.collect(Collectors.toList());
+			empList= list.stream()
+					.map(e->(Emp)employeeMapper.mapEntityToPojo(e))
+					.collect(Collectors.toList());
+		}
+		return empList;
+	}
+
+	@Override
+	public Long deleteByEmpId(Long empId) {
+		return empMongoRepository.deleteByEmployeeId(empId);
+	}
+
+}

src/main/resources/application.properties

+spring.data.mongodb.host=localhost
+spring.data.mongodb.port=27017
+spring.data.mongodb.database=ownDatabase
+
+server.servlet.context-path=/simple-poc
+
+logging.level.org.springframework.data.mongodb.core.MongoTemplate=DEBUG
+logging.level.org.springframework=INFO
+logging.level.root=INFO 
+server.port=8081

src/test/java/com/poc/SimplePocApplicationTests.java

+package com.poc;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class SimplePocApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}