working draft

demos/sample_apps/java/weather_forcecast_service/Dockerfile

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+# Stage 1: Build the application using Maven
+FROM maven:3.8.7-openjdk-17 AS build
+WORKDIR /app
+# Copy pom.xml and download dependencies first (caching)
+COPY pom.xml .
+RUN mvn dependency:go-offline
+# Copy the source code and build the application
+COPY src ./src
+RUN mvn clean package -DskipTests
+
+# Stage 2: Run the application using a slim JDK image
+FROM openjdk:17-jdk-slim
+WORKDIR /app
+# Copy the built jar from the previous stage
+COPY --from=build /app/target/weather-forecast-service-0.0.1-SNAPSHOT.jar app.jar
+# Expose the port on which the app runs (default Spring Boot is 8080)
+EXPOSE 8080
+ENTRYPOINT ["java", "-jar", "app.jar"]

demos/sample_apps/java/weather_forcecast_service/pom.xml

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+<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>
+
+    <groupId></groupId>
+    <artifactId>weather-forecast-service</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.7.10</version>
+        <relativePath/>
+    </parent>
+
+    <dependencies>
+        <!-- Spring Boot Starter Web -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <!-- Spring Boot Maven Plugin -->
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>

demos/sample_apps/java/weather_forcecast_service/src/main/java/weather/WeatherForecastApplication.java

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+// File: src/main/java/com/example/weather/WeatherForecastApplication.java
+package weather;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class WeatherForecastApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(WeatherForecastApplication.class, args);
+    }
+}

demos/sample_apps/java/weather_forcecast_service/src/main/java/weather/controller/WeatherController.java

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+package weather.controller;
+
+import weather.model.DayForecast;
+import weeather.model.Temperature;
+import weather.model.WeatherForecastResponse;
+import weather.model.WeatherRequest;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.time.Instant;
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+
+@RestController
+public class WeatherController {
+
+    private Random random = new Random();
+
+    @PostMapping("/weather")
+    public WeatherForecastResponse getWeather(@RequestBody WeatherRequest req) {
+        WeatherForecastResponse response = new WeatherForecastResponse();
+        response.setLocation(req.getLocation());
+        response.setUnits(req.getUnits());
+
+        List<DayForecast> forecasts = new ArrayList<>();
+        for (int i = 0; i < req.getDays(); i++) {
+            // Generate a random min temperature between 50 and 89 (inclusive)
+            int minTemp = random.nextInt(90 - 50) + 50;
+            // Generate a max temperature between (minTemp + 5) and (minTemp + 19)
+            int maxTemp = random.nextInt(15) + (minTemp + 5);
+
+            double finalMinTemp = minTemp;
+            double finalMaxTemp = maxTemp;
+
+            // Convert to Celsius if necessary
+            if (req.getUnits().equalsIgnoreCase("celsius") || req.getUnits().equalsIgnoreCase("c")) {
+                finalMinTemp = (minTemp - 32) * 5.0 / 9.0;
+                finalMaxTemp = (maxTemp - 32) * 5.0 / 9.0;
+            }
+
+            DayForecast dayForecast = new DayForecast();
+            dayForecast.setDate(LocalDate.now().plusDays(i).toString());
+            dayForecast.setMin(finalMinTemp);
+            dayForecast.setMax(finalMaxTemp);
+            dayForecast.setUnits(req.getUnits());
+
+            forecasts.add(dayForecast);
+        }
+        response.setDailyForecast(forecasts);
+        return response;
+    }
+}

demos/sample_apps/java/weather_forcecast_service/src/main/java/weather/model/DayForecast.java

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+package weather.model;
+
+public class DayForecast {
+    private String date;
+    private String units;
+    private double min;
+    private double max;
+
+    public DayForecast() {}
+
+    // Getters and setters
+    public String getDate() {
+        return date;
+    }
+
+    public void setDate(String date) {
+        this.date = date;
+    }
+
+    public String getUnits() {
+        return units;
+    }
+
+    public void setUnits(String units) {
+        this.units = units;
+    }
+
+    public double getMin() {
+        return min;
+    }
+    public void setMin(double min) {
+        this.min = min;
+    }
+    public double getMax() {
+        return max;
+    }
+    public void setMax(double max) {
+        this.max = max;
+    }
+}

demos/sample_apps/java/weather_forcecast_service/src/main/java/weather/model/WeatherForecastResponse.java

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+package weather.model;
+
+import java.util.List;
+
+public class WeatherForecastResponse {
+    private String location;
+    private String units;
+    private List<DayForecast> temperature;
+
+    // Default Constructor
+    public WeatherForecastResponse() {}
+
+    // Getters and Setters
+    public String getLocation() {
+        return location;
+    }
+
+    public void setLocation(String location) {
+        this.location = location;
+    }
+
+    public String getUnits() {
+        return units;
+    }
+
+    public void setUnits(String units) {
+        this.units = units;
+    }
+
+    public List<DayForecast> getDailyForecast() {
+        return temperature;
+    }
+
+    public void setDailyForecas(List<DayForecast> forecast) {
+        this.forecast = forecast;
+    }
+}

demos/sample_apps/java/weather_forcecast_service/src/main/java/weather/model/WeatherRequest.java

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+package weather.model;
+
+public class WeatherRequest {
+    private String location;
+    private int days = 7;
+    private String units = "Farenheit";
+
+    public WeatherRequest() {}
+
+    // Getters and setters
+    public String getLocation() {
+        return location;
+    }
+    public void setLocation(String location) {
+        this.location = location;
+    }
+    public int getDays() {
+        return days;
+    }
+    public void setDays(int days) {
+        this.days = days;
+    }
+    public String getUnits() {
+        return units;
+    }
+    public void setUnits(String units) {
+        this.units = units;
+    }
+}