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About Emmanouil Gkatziouras

Emmanouil Gkatziouras
He is a versatile software engineer with experience in a wide variety of applications/services.He is enthusiastic about new projects, embracing new technologies, and getting to know people in the field of software.

Spring Boot and Micrometer with InlfuxDB Part 1: The base project

To those who follow this blog it’s no wonder that I tend to use InfluxDB a lot. I like the fact that it is a real single purpose database (time series) with many features and also comes with enterprise support.

Spring is also one of the tools of my choice. Thus in this blog we shall integrate spring with micrometer and InfluxDB.

Our application will be a rest api for jobs. Initially it will fetch the Jobs from Github’s job api as shown here.

Let’s start with a pom

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<?xml version="1.0" encoding="UTF-8"?>
    <modelVersion>4.0.0</modelVersion>
 
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.4.RELEASE</version>
    </parent>
 
    <groupId>com.gkatzioura</groupId>
    <artifactId>DevJobsApi</artifactId>
    <version>1.0-SNAPSHOT</version>
 
    <build>
        <defaultGoal>spring-boot:run</defaultGoal>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>8</source>
                    <target>8</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
 
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-webflux</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
            <scope>provided</scope>
        </dependency>
   </dependencies>
</project>

Let’s add the Job Repository for GitHub.

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package com.gkatzioura.jobs.repository;
 
import java.util.List;
 
import org.springframework.http.HttpMethod;
import org.springframework.stereotype.Repository;
import org.springframework.web.reactive.function.client.WebClient;
 
import com.gkatzioura.jobs.model.Job;
 
import reactor.core.publisher.Mono;
 
@Repository
public class GitHubJobRepository {
 
    private WebClient githubClient;
 
    public GitHubJobRepository() {
        this.githubClient = WebClient.create("https://jobs.github.com");
    }
 
    public Mono<List<Job>> getJobsFromPage(int page) {
 
        return githubClient.method(HttpMethod.GET)
                           .uri("/positions.json?page=" + page)
                           .retrieve()
                           .bodyToFlux(Job.class)
                           .collectList();
    }
 
}

The Job model

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package com.gkatzioura.jobs.model;
 
import lombok.Data;
 
@Data
public class Job {
 
    private String id;
    private String type;
    private String url;
    private String createdAt;
    private String company;
    private String companyUrl;
    private String location;
    private String title;
    private String description;
 
}

The controller

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package com.gkatzioura.jobs.controller;
 
import java.util.List;
 
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
 
import com.gkatzioura.jobs.model.Job;
import com.gkatzioura.jobs.repository.GitHubJobRepository;
 
import reactor.core.publisher.Mono;
 
@RestController
@RequestMapping("/jobs")
public class JobsController {
 
    private final GitHubJobRepository gitHubJobRepository;
 
    public JobsController(GitHubJobRepository gitHubJobRepository) {
        this.gitHubJobRepository = gitHubJobRepository;
    }
 
    @GetMapping("/github/{page}")
    private Mono<List<Job>> getEmployeeById(@PathVariable int page) {
        return gitHubJobRepository.getJobsFromPage(page);
    }
 
}

And last but not least the main application.

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package com.gkatzioura;
 
 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.security.reactive.ReactiveSecurityAutoConfiguration;
 
@SpringBootApplication
@EnableAutoConfiguration(exclude = {
        ReactiveSecurityAutoConfiguration.class
})
public class Application {
 
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

On the next blog we are going to integrate with InfluxDB and micrometer.

Published on Java Code Geeks with permission by Emmanouil Gkatziouras, partner at our JCG program. See the original article here: Spring Boot and Micrometer with InlfuxDB Part 1: The base project

Opinions expressed by Java Code Geeks contributors are their own.

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