Adding changes related to Kafka-mongo poc

.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>2.4.4</version>
+		<relativePath /> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>com.poc.kafka.mongo</groupId>
+	<artifactId>kafka-mongo-poc</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>kafka-mongo-poc</name>
+	<description>Demo project for Spring Boot</description>
+	<properties>
+		<java.version>1.8</java.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.kafka</groupId>
+			<artifactId>kafka-streams</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.kafka</groupId>
+			<artifactId>spring-kafka</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.kafka</groupId>
+			<artifactId>spring-kafka-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>com.google.code.gson</groupId>
+			<artifactId>gson</artifactId>
+		</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>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-mongodb</artifactId>
+		</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/kafka/mongo/KafkaPocApplication.java

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

src/main/java/com/poc/kafka/mongo/config/KafkaConfiguration.java

+package com.poc.kafka.mongo.config;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.clients.producer.ProducerConfig;
+import org.apache.kafka.common.serialization.StringDeserializer;
+import org.apache.kafka.common.serialization.StringSerializer;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
+import org.springframework.kafka.core.ConsumerFactory;
+import org.springframework.kafka.core.DefaultKafkaConsumerFactory;
+import org.springframework.kafka.core.DefaultKafkaProducerFactory;
+import org.springframework.kafka.core.KafkaTemplate;
+import org.springframework.kafka.core.ProducerFactory;
+
+@Configuration
+public class KafkaConfiguration {
+	@Value("${spring.kafka.bootstrap-servers}")
+	private String server;
+	
+
+	@Value("${spring.kafka.consumer.group-id}")
+	private String consumerGroupId;
+	@Bean
+    ProducerFactory<String, String> producerFactory() {
+        Map<String, Object> config = new HashMap<>();
+        config.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, server);
+        config.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
+        config.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
+        return new DefaultKafkaProducerFactory<String, String>(config);
+    }
+ 
+    @Bean
+    KafkaTemplate<String, String> kafkaTemplate() {
+        return new KafkaTemplate<String, String>(producerFactory());
+    }
+ 
+    @Bean
+    public ConsumerFactory<String, String> consumerFatory() {
+        Map<String, Object> config = new HashMap<>();
+        config.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, server);
+        config.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
+        config.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
+        config.put(ConsumerConfig.GROUP_ID_CONFIG, consumerGroupId);
+        config.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);
+        return new DefaultKafkaConsumerFactory<>(config, new StringDeserializer(), new StringDeserializer());
+    }
+ 
+    @Bean
+    public ConcurrentKafkaListenerContainerFactory<String, String> kafkaListenerContainerFactory() {
+        ConcurrentKafkaListenerContainerFactory<String, String> concurrentKafkaListenerContainerFactory = new ConcurrentKafkaListenerContainerFactory<>();
+        concurrentKafkaListenerContainerFactory.setConsumerFactory(consumerFatory());
+        concurrentKafkaListenerContainerFactory.setMissingTopicsFatal(false);
+        return concurrentKafkaListenerContainerFactory;
+    }
+ 
+    
+
+
+
+
+}

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

+package com.poc.kafka.mongo.controller;
+
+import java.util.List;
+import java.util.concurrent.ExecutionException;
+
+import javax.validation.Valid;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.kafka.annotation.KafkaListener;
+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.kafka.mongo.model.Emp;
+import com.poc.kafka.mongo.service.EmployeeService;
+
+@RestController
+@Validated
+@RequestMapping(path = "/employees")
+public class EmployeeController {
+	@Autowired
+	private EmployeeService employeeService;
+
+	@PostMapping(produces = "application/json", consumes = "application/json", path = "/produce")
+	public void publishEmployee(@Valid @RequestBody Emp emp) throws InterruptedException, ExecutionException {
+		employeeService.send(emp);
+	}
+
+	@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/kafka/mongo/entity/Employee.java

+package com.poc.kafka.mongo.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/kafka/mongo/mapper/EmployeeMapper.java

+package com.poc.kafka.mongo.mapper;
+
+import java.util.Optional;
+
+import org.springframework.stereotype.Component;
+
+import com.poc.kafka.mongo.entity.Employee;
+import com.poc.kafka.mongo.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/kafka/mongo/mapper/EntityMapper.java

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

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

+package com.poc.kafka.mongo.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/kafka/mongo/repository/EmployeeMongoRepository.java

+package com.poc.kafka.mongo.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.kafka.mongo.entity.Employee;
+@Repository
+public interface EmployeeMongoRepository 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/kafka/mongo/repository/EmployeeRepository.java

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

src/main/java/com/poc/kafka/mongo/repository/EmployeeRepositoryImpl.java

+package com.poc.kafka.mongo.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.kafka.mongo.entity.Employee;
+@Repository
+public class EmployeeRepositoryImpl implements EmployeeRepository {
+	private static final Logger logger = LoggerFactory.getLogger(EmployeeRepositoryImpl.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/kafka/mongo/service/EmployeeService.java

+package com.poc.kafka.mongo.service;
+
+import java.util.List;
+
+import com.poc.kafka.mongo.model.Emp;
+
+public interface EmployeeService {
+
+	public void send(Emp e);
+	public void receive(String message);
+
+	/**
+	 * 
+	 * @param empId
+	 * @return
+	 */
+	public Emp findByEmpId(Long empId);
+	/**
+	 * 
+	 * @param id
+	 * @return
+	 */
+	public Emp findById(String id);
+	/**
+	 * 
+	 * @return
+	 */
+	public List<Emp> findAll();
+	/**
+	 * 
+	 * @param emp
+	 * @return
+	 */
+	public Emp save(Emp emp);
+	/**
+	 * 
+	 * @param emp
+	 */
+	public void saveOrUpdate(Emp emp);
+	/**
+	 * 
+	 * @param sal
+	 * @return
+	 */
+	public List<Emp> findBySalary(Double sal);
+	/**
+	 * 
+	 * @param empId
+	 * @return
+	 */
+	public Long deleteByEmpId(Long empId);
+
+
+}

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

+package com.poc.kafka.mongo.service;
+
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.kafka.core.KafkaTemplate;
+import org.springframework.kafka.support.SendResult;
+import org.springframework.stereotype.Service;
+import org.springframework.util.concurrent.ListenableFuture;
+import org.springframework.util.concurrent.ListenableFutureCallback;
+
+import com.google.gson.Gson;
+import com.poc.kafka.mongo.entity.Employee;
+import com.poc.kafka.mongo.mapper.EmployeeMapper;
+import com.poc.kafka.mongo.model.Emp;
+import com.poc.kafka.mongo.repository.EmployeeMongoRepository;
+import com.poc.kafka.mongo.repository.EmployeeRepository;
+@Service
+public class EmployeeServiceImpl implements EmployeeService {
+	private static final Logger logger = LoggerFactory.getLogger(EmployeeServiceImpl.class);
+	@Autowired
+	private KafkaTemplate<String, String> kafkaTemplate;
+
+	@Autowired
+	private Gson gson;
+	@Value(value = "${spring.kafka.topics}")
+	private String topicName;
+
+	@Autowired
+	private EmployeeMongoRepository employeeMongoRepository;
+	@Autowired
+	private EmployeeMapper employeeMapper;
+	@Autowired
+	private EmployeeRepository employeeRepository;
+
+
+	@Override
+	public void send(Emp emp) {
+
+		String request = gson.toJson(emp);
+		ListenableFuture<SendResult<String, String>> future = this.kafkaTemplate.send(topicName, request);
+		future.addCallback(new ListenableFutureCallback<SendResult<String, String>>() {
+			@Override
+			public void onFailure(Throwable ex) {
+				logger.info("Unable to send message=[ {} ] due to : {}", request, ex.getMessage());
+			}
+
+			@Override
+			public void onSuccess(SendResult<String, String> result) {
+				logger.info("Sent message=[ {} ] with offset=[ {} ]", request, result.getRecordMetadata().offset());
+			}
+		});
+	}
+
+	@Override
+	@KafkaListener(topics = { "${spring.kafka.topics}" })
+	public void receive(String emp) {
+		logger.info("Kafka event consumed is:{} " , emp);
+		Emp e = gson.fromJson(emp, Emp.class);
+		logger.info("converted value:{} " , e.toString());
+		/**
+		 * To send to mongo database after listening the record from kafka
+		 */
+		saveOrUpdate(e);
+	}
+	
+	@Override
+	public Emp findByEmpId(Long empId) {
+		return (Emp)employeeMapper.mapEntityToPojo(employeeMongoRepository.findByEmpId(empId));
+	}
+
+	@Override
+	public Emp findById(String id) {
+		return (Emp)employeeMapper.mapEntityToPojo(employeeMongoRepository.findById(id).orElse(new Employee()));
+	}
+
+	@Override
+	public List<Emp> findAll() {
+		List<Employee> list= employeeMongoRepository.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(employeeMongoRepository.save(employee));
+	}
+
+	@Override
+	public void saveOrUpdate(Emp emp) {
+		Employee employee = (Employee) employeeMapper.mapPojoToEntity(emp);
+		employeeRepository.saveOrUpdate(employee);
+
+	}
+
+	@Override
+	public List<Emp> findBySalary(Double sal) {
+		List<Emp> empList= null;
+		try (Stream<Employee> stream = employeeMongoRepository.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 employeeMongoRepository.deleteByEmployeeId(empId);
+	}
+
+
+
+}

src/main/resources/application.properties

+spring.kafka.bootstrap-servers=127.0.0.1:9092
+##Producer Serialization:
+#spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer
+#spring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer
+
+spring.kafka.topics=topic_emp
+server.port=8083
+
+
+#consumer properties
+#spring.kafka.consumer.key-deserializer= org.apache.kafka.common.serialization.StringDeserializer
+#spring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer
+spring.kafka.consumer.group-id=emp_consume_group
+#spring.kafka.consumer.enable-auto-commit=false
+#spring.kafka.listener.missing-topics-fatal=false
+
+#Mongo DB properties
+spring.data.mongodb.host=localhost
+spring.data.mongodb.port=27017
+spring.data.mongodb.database=ownDatabase
+
+server.servlet.context-path=/kafka-mongo-poc
+
+logging.level.org.springframework.data.mongodb.core.MongoTemplate=DEBUG
+logging.level.org.springframework=INFO
+logging.level.root=INFO
\ No newline at end of file

src/test/java/com/poc/kafka/KafkaPocApplicationTests.java

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