KafkaOrderAmountAlertMailService

Overall, this code represents an application that saves orders, sends order events to Kafka, consumes order events from Kafka, and sends email alerts for highest orders. It uses Spring Boot, Spring Data JPA, Kafka, and JavaMailSender for these functionalities.

This code appears to be a part of an application that handles orders and alerts based on the order amount. Let me explain the code in detail:

1. OrderController: - This is a REST controller that handles incoming HTTP POST requests to create orders. - It uses the OrderService to save the order and then returns the saved order along with a status code.

2. OrderService: - This is an interface defining the contract for saving orders.

3. OrderServiceImpl: - This is the implementation of the OrderService interface. - It saves the order using the OrderRepository and sends a highest order alert using the AlertService.

4. OrderRepository: - This is a Spring Data repository interface for the Order entity.

5. Order: - This is an entity class representing an order with properties such as id, productName, and amount. - It is annotated with JPA annotations such as @Entity, @Id, @GeneratedValue, and @Data for automatic generation of getters, setters, and other boilerplate code.

6. OrderEventProducer: - This is a service responsible for sending order events to a Kafka topic named "HighestOrder" using a KafkaTemplate.

7. OrderKafkaConsumer: - This is a Kafka consumer that listens to the "HighestOrder" topic and consumes order events. - It uses the AlertService to check if the order amount is the highest and then logs the consumed message.

8. AlertService: - This service has a thresholdAmount property and is responsible for sending highest order alerts. - It uses the JavaMailSender to send email alerts and the OrderEventProducer to send order events to Kafka if the order amount exceeds the threshold.

9. MailConfig: - This class configures the JavaMailSender properties for sending email alerts.

10. KafkaConsumerConfig: - This class configures the Kafka consumer properties and deserializers for consuming order events from the "HighestOrder" topic.

    Installation ------------------------------------------------------------------------ dependency: Java 8 download: https://kafka.apache.org/downloads Scala - 2.13 (tgz)

        Extract it to drive:/kafka
    
        create folder drive:/kafka/data/zookeeper       //state maintanence
        create folder drive:/kafka/data/kafka           //kafka server logs
    
        open drive:/kafka/config/zookeeper.properties
        set the below prop:
                dataDir=drive:/kafka/data/zookeeper
    
        open drive:/kafka/config/server.properties
        set the below prop:
               log.dirs=drive:/kafka/data/kafka
    
        INSTALLATION IS DONE
    
    Start Up
    ------------------------------------------------------------------------
    
        Start ZooKeeper
            drive:\kafka\bin\windows>zookeeper-server-start.bat ../../config/zookeeper.properties
    
        Start Kafka
            drive:\kafka\bin\windows>kafka-server-start.bat ../../config/server.properties
    

First Start Zookeeper server then start kafka Server after Running Both the Server then Start SpringBoot Application

Postman

Alertmail