Create software components for Spring Boot jar and war artifacts

Closes gh-1666

spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/bundling/BundlingPluginFeatures.java

@@ -16,13 +16,21 @@
 
 package org.springframework.boot.gradle.bundling;
 
+import java.util.Collections;
+import java.util.Set;
 import java.util.concurrent.Callable;
 
 import org.gradle.api.Project;
 import org.gradle.api.artifacts.Configuration;
+import org.gradle.api.artifacts.ModuleDependency;
+import org.gradle.api.artifacts.PublishArtifact;
 import org.gradle.api.artifacts.maven.MavenResolver;
+import org.gradle.api.attributes.Usage;
 import org.gradle.api.file.FileCollection;
 import org.gradle.api.internal.artifacts.publish.ArchivePublishArtifact;
+import org.gradle.api.internal.attributes.Usages;
+import org.gradle.api.internal.component.SoftwareComponentInternal;
+import org.gradle.api.internal.component.UsageContext;
 import org.gradle.api.plugins.JavaPlugin;
 import org.gradle.api.plugins.JavaPluginConvention;
 import org.gradle.api.plugins.WarPlugin;
@@ -54,7 +62,9 @@ public class BundlingPluginFeatures implements PluginFeatures {
 	private void configureBootWarTask(Project project) {
 		BootWar bootWar = project.getTasks().create("bootWar", BootWar.class);
 		bootWar.providedClasspath(providedRuntimeConfiguration(project));
-		this.singlePublishedArtifact.addCandidate(new ArchivePublishArtifact(bootWar));
+		ArchivePublishArtifact artifact = new ArchivePublishArtifact(bootWar);
+		this.singlePublishedArtifact.addCandidate(artifact);
+		project.getComponents().add(new BootSoftwareComponent(artifact, "bootWeb"));
 	}
 
 	private void configureBootJarTask(Project project) {
@@ -66,7 +76,9 @@ public class BundlingPluginFeatures implements PluginFeatures {
 					.getByName(SourceSet.MAIN_SOURCE_SET_NAME);
 			return mainSourceSet.getRuntimeClasspath();
 		});
-		this.singlePublishedArtifact.addCandidate(new ArchivePublishArtifact(bootJar));
+		ArchivePublishArtifact artifact = new ArchivePublishArtifact(bootJar);
+		this.singlePublishedArtifact.addCandidate(artifact);
+		project.getComponents().add(new BootSoftwareComponent(artifact, "bootJava"));
 	}
 
 	private void configureBootArchivesUpload(Project project) {
@@ -89,4 +101,58 @@ public class BundlingPluginFeatures implements PluginFeatures {
 				.getByName(WarPlugin.PROVIDED_RUNTIME_CONFIGURATION_NAME);
 	}
 
+	/**
+	 * {@link SofwareComponent} for a Spring Boot fat jar or war.
+	 */
+	private static final class BootSoftwareComponent
+			implements SoftwareComponentInternal {
+
+		private final PublishArtifact artifact;
+
+		private final String name;
+
+		private BootSoftwareComponent(PublishArtifact artifact, String name) {
+			this.artifact = artifact;
+			this.name = name;
+		}
+
+		@Override
+		public String getName() {
+			return this.name;
+		}
+
+		@Override
+		public Set<UsageContext> getUsages() {
+			return Collections.singleton(new BootUsageContext(this.artifact));
+		}
+
+		private static final class BootUsageContext implements UsageContext {
+
+			private static final Usage USAGE = Usages.usage("master");
+
+			private final PublishArtifact artifact;
+
+			private BootUsageContext(PublishArtifact artifact) {
+				this.artifact = artifact;
+			}
+
+			@Override
+			public Usage getUsage() {
+				return USAGE;
+			}
+
+			@Override
+			public Set<PublishArtifact> getArtifacts() {
+				return Collections.singleton(this.artifact);
+			}
+
+			@Override
+			public Set<ModuleDependency> getDependencies() {
+				return Collections.emptySet();
+			}
+
+		}
+
+	}
+
 }

spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/bundling/MavenPublishingIntegrationTests.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright 2012-2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.gradle.bundling;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+import org.gradle.testkit.runner.BuildResult;
+import org.gradle.testkit.runner.TaskOutcome;
+import org.junit.Rule;
+import org.junit.Test;
+
+import org.springframework.boot.gradle.testkit.GradleBuild;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Integration tests for publishing Boot jars and wars using Gradle's Maven Publish
+ * plugin.
+ *
+ * @author Andy Wilkinson
+ */
+public class MavenPublishingIntegrationTests {
+
+	@Rule
+	public final GradleBuild gradleBuild = new GradleBuild();
+
+	@Test
+	public void bootJarCanBePublished() throws FileNotFoundException, IOException {
+		BuildResult result = this.gradleBuild.build("publish");
+		assertThat(result.task(":publish").getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
+		assertThat(artifactWithSuffix("jar")).isFile();
+		assertThat(artifactWithSuffix("pom")).is(pomWith().groupId("com.example")
+				.artifactId(this.gradleBuild.getProjectDir().getName()).version("1.0")
+				.noPackaging().noDependencies());
+	}
+
+	@Test
+	public void bootWarCanBePublished() throws IOException {
+		BuildResult result = this.gradleBuild.build("publish");
+		assertThat(result.task(":publish").getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
+		assertThat(artifactWithSuffix("war")).isFile();
+		assertThat(artifactWithSuffix("pom")).is(pomWith().groupId("com.example")
+				.artifactId(this.gradleBuild.getProjectDir().getName()).version("1.0")
+				.packaging("war").noDependencies());
+	}
+
+	private File artifactWithSuffix(String suffix) {
+		String name = this.gradleBuild.getProjectDir().getName();
+		return new File(new File(this.gradleBuild.getProjectDir(), "build/repo"),
+				String.format("com/example/%s/1.0/%s-1.0.%s", name, name, suffix));
+	}
+
+	private PomCondition pomWith() {
+		return new PomCondition();
+	}
+
+}

spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/bundling/MavenPublishingIntegrationTests-bootJarCanBePublished.gradle

@@ -0,0 +1,29 @@
+buildscript {
+	dependencies {
+		classpath files(pluginClasspath.split(','))
+	}
+}
+
+apply plugin: 'java'
+apply plugin: 'org.springframework.boot'
+apply plugin: 'maven-publish'
+
+bootJar {
+	mainClass = 'com.example.Application'
+}
+
+group = 'com.example'
+version = '1.0'
+
+publishing {
+	repositories {
+		maven {
+			url "$buildDir/repo"
+		}
+	}
+	publications {
+		mavenBootJava(MavenPublication) {
+			from components.bootJava
+		}
+	}
+}

spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/bundling/MavenPublishingIntegrationTests-bootWarCanBePublished.gradle

@@ -0,0 +1,29 @@
+buildscript {
+	dependencies {
+		classpath files(pluginClasspath.split(','))
+	}
+}
+
+apply plugin: 'war'
+apply plugin: 'org.springframework.boot'
+apply plugin: 'maven-publish'
+
+bootWar {
+	mainClass = 'com.example.Application'
+}
+
+group = 'com.example'
+version = '1.0'
+
+publishing {
+	repositories {
+		maven {
+			url "$buildDir/repo"
+		}
+	}
+	publications {
+		mavenBootWeb(MavenPublication) {
+			from components.bootWeb
+		}
+	}
+}