Merge pull request #670 from dsyer:feature/function

* pr/670:
  Polish "Add Spring Cloud Function"
  Add Spring Cloud Function

initializr-service/src/main/java/io/spring/initializr/service/extension/SpringCloudFunctionRequestPostProcessor.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2012-2018 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 io.spring.initializr.service.extension;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import io.spring.initializr.generator.ProjectRequest;
+import io.spring.initializr.metadata.Dependency;
+import io.spring.initializr.metadata.InitializrMetadata;
+
+import org.springframework.stereotype.Component;
+
+/**
+ * Determine the appropriate Spring Cloud function dependency according to the messaging
+ * and/or platform dependencies requested.
+ *
+ * @author Dave Syer
+ */
+@Component
+class SpringCloudFunctionRequestPostProcessor
+		extends AbstractProjectRequestPostProcessor {
+
+	static final Dependency SCS_ADAPTER = Dependency.withId("cloud-function-stream",
+			"org.springframework.cloud", "spring-cloud-function-stream");
+
+	static final Dependency WEB_ADAPTER = Dependency.withId("cloud-function-web",
+			"org.springframework.cloud", "spring-cloud-function-web");
+
+	@Override
+	public void postProcessAfterResolution(ProjectRequest request,
+			InitializrMetadata metadata) {
+		Dependency cloudFunction = getDependency(request, "cloud-function");
+		if (cloudFunction != null) {
+			List<Dependency> swap = new ArrayList<>();
+			if (hasDependency(request, "cloud-stream")
+					|| hasDependency(request, "reactive-cloud-stream")) {
+				swap.add(SCS_ADAPTER);
+			}
+			if (hasDependency(request, "web")) {
+				swap.add(WEB_ADAPTER);
+			}
+			if (!swap.isEmpty()) {
+				request.getResolvedDependencies().remove(cloudFunction);
+				request.getResolvedDependencies().addAll(swap);
+			}
+		}
+	}
+
+}

initializr-service/src/main/resources/application.yml

@@ -814,6 +814,18 @@ initializr:
           groupId: org.springframework.cloud
           artifactId: spring-cloud-starter
           weight: 100
+        - name: Cloud Function
+          id: cloud-function
+          groupId: org.springframework.cloud
+          artifactId: spring-cloud-function-context
+          description: Functions as Spring Beans
+          versionRange: 2.0.2.RELEASE
+          links:
+            - rel: reference
+              href: https://cloud.spring.io/spring-cloud-function/
+            - rel: sample
+              href: https://github.com/spring-cloud/spring-cloud-function/tree/master/spring-cloud-function-samples
+              description: Various sample apps using Spring Cloud Function
         - name: Cloud Security
           id: cloud-security
           description: Secure load balancing and routing with spring-cloud-security

initializr-service/src/test/java/io/spring/initializr/service/extension/SpringCloudFunctionRequestPostProcessorTests.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2012-2018 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 io.spring.initializr.service.extension;
+
+import io.spring.initializr.generator.ProjectRequest;
+import org.junit.Test;
+
+/**
+ * Tests for {@link SpringCloudFunctionRequestPostProcessor}.
+ *
+ * @author Dave Syer
+ */
+public class SpringCloudFunctionRequestPostProcessorTests
+		extends AbstractRequestPostProcessorTests {
+
+	@Test
+	public void functionOnly() {
+		ProjectRequest request = createProjectRequest("cloud-function");
+		generateMavenPom(request).hasDependency(getDependency("cloud-function"))
+				.hasSpringBootStarterTest().hasDependenciesCount(2);
+	}
+
+	@Test
+	public void springCloudStreamWithRabbit() {
+		ProjectRequest request = createProjectRequest("cloud-stream", "amqp",
+				"cloud-function");
+		generateMavenPom(request).hasDependency(getDependency("cloud-stream"))
+				.hasDependency(getDependency("amqp"))
+				.hasDependency(SpringCloudFunctionRequestPostProcessor.SCS_ADAPTER)
+				.hasDependenciesCount(6);
+	}
+
+	@Test
+	public void reactiveSpringCloudStreamWithKafka() {
+		ProjectRequest request = createProjectRequest("reactive-cloud-stream", "kafka",
+				"cloud-function");
+		generateMavenPom(request).hasDependency(getDependency("reactive-cloud-stream"))
+				.hasDependency(getDependency("kafka"))
+				.hasDependency(SpringCloudFunctionRequestPostProcessor.SCS_ADAPTER)
+				.hasDependenciesCount(6);
+	}
+
+	@Test
+	public void web() {
+		ProjectRequest request = createProjectRequest("web", "cloud-function");
+		generateMavenPom(request).hasDependency(getDependency("web"))
+				.hasDependency(SpringCloudFunctionRequestPostProcessor.WEB_ADAPTER)
+				.hasDependenciesCount(3);
+	}
+
+}