Feature/bael 338 introduction dropwizard (eugenp#8572)

* [ BAEL-3388 ] : Introduction Dropwizard

* BAEL-3388: Fix formatting

Author: lukaszrys

dropwizard/README.md

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+# Dropwizard

dropwizard/pom.xml

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+<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>dropwizard</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>dropwizard</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.dropwizard</groupId>
+            <artifactId>dropwizard-core</artifactId>
+            <version>${dropwizard.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <configuration>
+                    <createDependencyReducedPom>true</createDependencyReducedPom>
+                    <filters>
+                        <filter>
+                            <artifact>*:*</artifact>
+                            <excludes>
+                                <exclude>META-INF/*.SF</exclude>
+                                <exclude>META-INF/*.DSA</exclude>
+                                <exclude>META-INF/*.RSA</exclude>
+                            </excludes>
+                        </filter>
+                    </filters>
+                </configuration>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                        <configuration>
+                            <transformers>
+                                <transformer
+                                        implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
+                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                                    <mainClass>com.baeldung.dropwizard.introduction.IntroductionApplication</mainClass>
+                                </transformer>
+                            </transformers>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <dropwizard.version>2.0.0</dropwizard.version>
+    </properties>
+
+</project>

dropwizard/src/main/java/com/baeldung/dropwizard/introduction/IntroductionApplication.java

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+package com.baeldung.dropwizard.introduction;
+
+import com.baeldung.dropwizard.introduction.configuration.ApplicationHealthCheck;
+import com.baeldung.dropwizard.introduction.configuration.BasicConfiguration;
+import com.baeldung.dropwizard.introduction.domain.Brand;
+import com.baeldung.dropwizard.introduction.repository.BrandRepository;
+import com.baeldung.dropwizard.introduction.resource.BrandResource;
+import io.dropwizard.Application;
+import io.dropwizard.configuration.ResourceConfigurationSourceProvider;
+import io.dropwizard.setup.Bootstrap;
+import io.dropwizard.setup.Environment;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class IntroductionApplication extends Application<BasicConfiguration> {
+
+    public static void main(final String[] args) throws Exception {
+        new IntroductionApplication().run("server", "introduction-config.yml");
+    }
+
+    @Override
+    public void run(final BasicConfiguration basicConfiguration, final Environment environment) {
+        final int defaultSize = basicConfiguration.getDefaultSize();
+        final BrandRepository brandRepository = new BrandRepository(initBrands());
+        final BrandResource brandResource = new BrandResource(defaultSize, brandRepository);
+        environment
+          .jersey()
+          .register(brandResource);
+
+        final ApplicationHealthCheck healthCheck = new ApplicationHealthCheck();
+        environment
+          .healthChecks()
+          .register("application", healthCheck);
+    }
+
+    @Override
+    public void initialize(final Bootstrap<BasicConfiguration> bootstrap) {
+        bootstrap.setConfigurationSourceProvider(new ResourceConfigurationSourceProvider());
+        super.initialize(bootstrap);
+    }
+
+    private List<Brand> initBrands() {
+        final List<Brand> brands = new ArrayList<>();
+        brands.add(new Brand(1L, "Brand1"));
+        brands.add(new Brand(2L, "Brand2"));
+        brands.add(new Brand(3L, "Brand3"));
+
+        return brands;
+    }
+}

dropwizard/src/main/java/com/baeldung/dropwizard/introduction/configuration/ApplicationHealthCheck.java

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+package com.baeldung.dropwizard.introduction.configuration;
+
+import com.codahale.metrics.health.HealthCheck;
+
+public class ApplicationHealthCheck extends HealthCheck {
+    @Override
+    protected Result check() throws Exception {
+        return Result.healthy();
+    }
+}

dropwizard/src/main/java/com/baeldung/dropwizard/introduction/configuration/BasicConfiguration.java

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+package com.baeldung.dropwizard.introduction.configuration;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import io.dropwizard.Configuration;
+
+import javax.validation.constraints.NotNull;
+
+public class BasicConfiguration extends Configuration {
+    @NotNull private final int defaultSize;
+
+    @JsonCreator
+    public BasicConfiguration(@JsonProperty("defaultSize") final int defaultSize) {
+        this.defaultSize = defaultSize;
+    }
+
+    public int getDefaultSize() {
+        return defaultSize;
+    }
+}

dropwizard/src/main/java/com/baeldung/dropwizard/introduction/domain/Brand.java

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+package com.baeldung.dropwizard.introduction.domain;
+
+public class Brand {
+    private final Long id;
+    private final String name;
+
+    public Brand(final Long id, final String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+}

dropwizard/src/main/java/com/baeldung/dropwizard/introduction/repository/BrandRepository.java

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+package com.baeldung.dropwizard.introduction.repository;
+
+import com.baeldung.dropwizard.introduction.domain.Brand;
+import com.google.common.collect.ImmutableList;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+public class BrandRepository {
+    private final List<Brand> brands;
+
+    public BrandRepository(final List<Brand> brands) {
+        this.brands = ImmutableList.copyOf(brands);
+    }
+
+    public List<Brand> findAll(final int size) {
+        return brands
+          .stream()
+          .limit(size)
+          .collect(Collectors.toList());
+    }
+
+    public Optional<Brand> findById(final Long id) {
+        return brands
+          .stream()
+          .filter(brand -> brand
+            .getId()
+            .equals(id))
+          .findFirst();
+    }
+}

dropwizard/src/main/java/com/baeldung/dropwizard/introduction/resource/BrandResource.java

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+package com.baeldung.dropwizard.introduction.resource;
+
+import com.baeldung.dropwizard.introduction.domain.Brand;
+import com.baeldung.dropwizard.introduction.repository.BrandRepository;
+
+import javax.ws.rs.*;
+import javax.ws.rs.core.MediaType;
+import java.util.List;
+import java.util.Optional;
+
+@Path("/brands")
+@Produces(MediaType.APPLICATION_JSON)
+public class BrandResource {
+    private final int defaultSize;
+    private final BrandRepository brandRepository;
+
+    public BrandResource(final int defaultSize, final BrandRepository brandRepository) {
+        this.defaultSize = defaultSize;
+        this.brandRepository = brandRepository;
+
+    }
+
+    @GET
+    public List<Brand> getBrands(@QueryParam("size") final Optional<Integer> size) {
+        return brandRepository.findAll(size.orElse(defaultSize));
+    }
+
+    @GET
+    @Path("/{id}")
+    public Brand getById(@PathParam("id") final Long id) {
+        return brandRepository
+          .findById(id)
+          .orElseThrow(RuntimeException::new);
+    }
+}

dropwizard/src/main/resources/introduction-config.yml

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+defaultSize: 5

dropwizard/src/test/java/com/baeldung/dropwizard/introduction/repository/BrandRepositoryUnitTest.java

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+package com.baeldung.dropwizard.introduction.repository;
+
+import com.baeldung.dropwizard.introduction.domain.Brand;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class BrandRepositoryUnitTest {
+
+    private static final Brand BRAND_1 = new Brand(1L, "Brand1");
+
+    private final BrandRepository brandRepository  = new BrandRepository(getBrands());
+
+    @Test
+    void givenSize_whenFindingAll_thenReturnList() {
+        final int size = 2;
+
+        final List<Brand> result = brandRepository.findAll(size);
+
+        assertEquals(size, result.size());
+    }
+
+    @Test
+    void givenId_whenFindingById_thenReturnFoundBrand() {
+        final Long id = BRAND_1.getId();
+
+        final Optional<Brand> result = brandRepository.findById(id);
+
+        Assertions.assertTrue(result.isPresent());
+        assertEquals(BRAND_1, result.get());
+    }
+
+
+    private List<Brand> getBrands() {
+        final List<Brand> brands = new ArrayList<>();
+        brands.add(BRAND_1);
+        brands.add(new Brand(2L, "Brand2"));
+        brands.add(new Brand(3L, "Brand3"));
+
+        return brands;
+    }
+}