[WIP] implemented basic temperature feature with basic consumer and producer

build.gradle.kts

@@ -21,6 +21,7 @@ dependencies {
     implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
     implementation("io.quarkus:quarkus-arc")
     testImplementation("io.quarkus:quarkus-junit5")
+    implementation("io.quarkus:quarkus-messaging-kafka")
 }
 
 group = "fr.faraphel"

docker-compose-2.yaml

@@ -0,0 +1,59 @@
+version: '3.5'
+
+services:
+  zookeeper:
+    image: strimzi/kafka:0.19.0-kafka-2.5.0
+    command: [
+      "sh", "-c",
+      "bin/zookeeper-server-start.sh config/zookeeper.properties"
+    ]
+    ports:
+      - "2181:2181"
+    environment:
+      LOG_DIR: /tmp/logs
+    networks:
+      - kafkastreams-network
+
+  kafka:
+    image: strimzi/kafka:0.19.0-kafka-2.5.0
+    command: [
+      "sh", "-c",
+      "bin/kafka-server-start.sh config/server.properties --override listeners=$${KAFKA_LISTENERS} --override advertised.listeners=$${KAFKA_ADVERTISED_LISTENERS} --override zookeeper.connect=$${KAFKA_ZOOKEEPER_CONNECT} --override num.partitions=$${KAFKA_NUM_PARTITIONS} --override group.min.session.timeout.ms=$${KAFKA_GROUP_MIN_SESSION_TIMEOUT_MS}"
+    ]
+    depends_on:
+      - zookeeper
+    ports:
+      - "9092:9092"
+    environment:
+      LOG_DIR: "/tmp/logs"
+      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka:9092
+      KAFKA_LISTENERS: PLAINTEXT://0.0.0.0:9092
+      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
+      KAFKA_NUM_PARTITIONS: 3
+      KAFKA_GROUP_MIN_SESSION_TIMEOUT_MS: 100
+    networks:
+      - kafkastreams-network
+
+  producer:
+    image: quarkus-quickstarts/kafka-streams-producer:1.0
+    build:
+      context: producer
+      dockerfile: src/main/docker/Dockerfile.${QUARKUS_MODE:-jvm}
+    environment:
+      KAFKA_BOOTSTRAP_SERVERS: kafka:9092
+    networks:
+      - kafkastreams-network
+
+  aggregator:
+    image: quarkus-quickstarts/kafka-streams-aggregator:1.0
+    build:
+      context: aggregator
+      dockerfile: src/main/docker/Dockerfile.${QUARKUS_MODE:-jvm}
+    environment:
+      QUARKUS_KAFKA_STREAMS_BOOTSTRAP_SERVERS: kafka:9092
+    networks:
+      - kafkastreams-network
+
+networks:
+  kafkastreams-network:
+    name: ks

docker-compose.yaml

@@ -0,0 +1,15 @@
+version: '2'
+
+networks:
+  kafka:
+    driver: bridge
+
+services:
+  kafka:
+    image: bitnami/kafka
+    ports:
+      - "9092:9092"
+    networks:
+      - kafka
+    volumes:
+      - kafka_data:/bitnami/kafka

gradle.properties

@@ -3,4 +3,9 @@ quarkusPluginId=io.quarkus
 quarkusPluginVersion=3.11.1
 quarkusPlatformGroupId=io.quarkus.platform
 quarkusPlatformArtifactId=quarkus-bom
-quarkusPlatformVersion=3.11.1
+quarkusPlatformVersion=3.11.1
+
+#Kafka Properties
+kafka.bootstrap.servers=${KAFKA_BOOTSTRAP_SERVERS:kafka:9092}
+quarkus.kafka-streams.bootstrap-servers=${KAFKA_BOOTSTRAP_SERVERS:kafka:9092}
+quarkus.kafka-streams.application-id=my-quarkus-app

src/main/kotlin/fr/faraphel/m1_pe_kafka/Consumer.kt

@@ -0,0 +1,45 @@
+package fr.faraphel.m1_pe_kafka
+
+/**
+ * The consumer
+ */
+
+import org.apache.kafka.clients.consumer.*
+
+import java.time.Duration
+import java.util.Collections
+import java.util.Properties
+
+
+/**
+ * The consumer
+ */
+class Consumer {
+    private val properties: Properties = Properties()
+    private var consumer: KafkaConsumer<String, String>
+    private val topic: String = "mon_beau_topic"
+
+    init {
+        this.properties[ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG] = "org.apache.kafka.common.serialization.StringSerializer"
+        this.properties[ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG] = "org.apache.kafka.common.serialization.StringSerializer"
+
+        this.properties[ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG] = "org.apache.kafka.common.serialization.StringSerializer"
+        this.properties[ConsumerConfig.GROUP_ID_CONFIG] = "premier_groupe"
+        this.properties[ConsumerConfig.AUTO_OFFSET_RESET_CONFIG] = "earliest"
+
+        this.consumer = KafkaConsumer(properties);
+    }
+
+    fun main() {
+        this.consumer.subscribe(Collections.singletonList(topic));
+
+        // Afficher les messages reçu
+        while (true) {
+            val messages: ConsumerRecords<String, String> = consumer.poll(Duration.ofMillis(500));
+            
+            messages.forEach { message ->
+                println(">" + message.value())
+            }
+        }
+    }
+}

src/main/kotlin/fr/faraphel/m1_pe_kafka/Main.kt

@@ -0,0 +1,27 @@
+package fr.faraphel.m1_pe_kafka
+
+import fr.faraphel.m1_pe_kafka.utils.Temperature
+import fr.faraphel.m1_pe_kafka.utils.celsius
+
+
+/**
+ * The main function
+ */
+fun main() {
+    println("Debut du programme")
+
+    val temperature: Temperature = 0.celsius
+    println(temperature.kelvin)
+
+    val producer = Producer()
+    val consumer = Consumer()
+
+    val thread1 = Thread { producer.main() }
+    val thread2 = Thread { consumer.main() }
+
+    thread1.start()
+    thread2.start()
+
+    thread1.join()
+    thread2.join()
+}

src/main/kotlin/fr/faraphel/m1_pe_kafka/Producer.kt

@@ -0,0 +1,33 @@
+package fr.faraphel.m1_pe_kafka
+
+import org.apache.kafka.clients.producer.KafkaProducer
+import org.apache.kafka.clients.producer.ProducerConfig
+import org.apache.kafka.clients.producer.ProducerRecord
+import java.util.Properties
+
+
+/**
+ * The producer
+ */
+class Producer {
+    private val properties: Properties = Properties()
+    private var producer: KafkaProducer<String, String>
+    private val topic: String = "Température_Celsius"
+
+    init {
+        this.properties[ProducerConfig.BOOTSTRAP_SERVERS_CONFIG] = "localhost:9092"
+        this.properties[ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG] = "org.apache.kafka.common.serialization.StringSerializer"
+        this.properties[ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG] = "org.apache.kafka.common.serialization.StringSerializer"
+        this.producer = KafkaProducer(properties)
+    }
+
+    fun main() {
+        while (true) {
+            // create a new record
+            val record: ProducerRecord<String, String> = ProducerRecord(this.topic, "bonjour el mundo")
+            // send the record
+            this.producer.send(record)
+            this.producer.flush()
+        }
+    }
+}

src/main/kotlin/fr/faraphel/m1_pe_kafka/utils/temperature.kt

@@ -0,0 +1,41 @@
+package fr.faraphel.m1_pe_kafka.utils
+
+
+/**
+ * Represent a temperature
+ * Allow to store temperature and convert the units in an easier way
+ * @param value the value of the temperature (Kelvin)
+ */
+class Temperature(
+    private val value: Double
+) {
+    // convert Temperature to Double (Kelvin)
+    val kelvin: Double
+        get() = this.value
+    // convert Temperature to Double (Celcius)
+    val celcius: Double
+        get() = this.value - 275.15
+    // convert Temperature to Double (Fahrenheit)
+    val fahrenheit: Double
+        get() = ((this.value - 273.15) * 1.8) + 32
+}
+
+// convert Double (Kelvin) to Temperature
+val Double.kelvin: Temperature
+    get() = Temperature(this)
+// convert Double (Celsius) to Temperature
+val Double.celsius: Temperature
+    get() = Temperature(this + 275.15)
+// convert Double (Fahrenheit) to Temperature
+val Double.fahrenheit: Temperature
+    get() = Temperature((this - 32 / 1.8) + 273.15)
+
+// convert Int (Kelvin) to Temperature
+val Int.kelvin: Temperature
+    get() = this.toDouble().kelvin
+// convert Int (Celsius) to Temperature
+val Int.celsius: Temperature
+    get() = this.toDouble().celsius
+// convert Int (Fahrenheit) to Temperature
+val Int.fahrenheit: Temperature
+    get() = this.toDouble().fahrenheit