Make FeignClientRegistrar implement EnvironmentAware (#1569)

Make FeignClientRegistrar implement EnvironmentAware to inject the environment.  

Fixes gh-1568

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/feign/FeignClientsRegistrar.java

@@ -37,10 +37,12 @@ import org.springframework.beans.factory.support.BeanDefinitionBuilder;
 import org.springframework.beans.factory.support.BeanDefinitionReaderUtils;
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
 import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.EnvironmentAware;
 import org.springframework.context.ResourceLoaderAware;
 import org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider;
 import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
 import org.springframework.core.annotation.AnnotationAttributes;
+import org.springframework.core.env.Environment;
 import org.springframework.core.io.ResourceLoader;
 import org.springframework.core.type.AnnotationMetadata;
 import org.springframework.core.type.ClassMetadata;
@@ -59,7 +61,7 @@ import org.springframework.util.StringUtils;
  * @author Venil Noronha
  */
 class FeignClientsRegistrar implements ImportBeanDefinitionRegistrar,
-		ResourceLoaderAware, BeanClassLoaderAware {
+		ResourceLoaderAware, BeanClassLoaderAware, EnvironmentAware {
 
 	// patterned after Spring Integration IntegrationComponentScanRegistrar
 	// and RibbonClientsConfigurationRegistgrar
@@ -68,6 +70,8 @@ class FeignClientsRegistrar implements ImportBeanDefinitionRegistrar,
 
 	private ClassLoader classLoader;
 
+	private Environment environment;
+
 	public FeignClientsRegistrar() {
 	}
 
@@ -272,7 +276,7 @@ class FeignClientsRegistrar implements ImportBeanDefinitionRegistrar,
 	}
 
 	protected ClassPathScanningCandidateComponentProvider getScanner() {
-		return new ClassPathScanningCandidateComponentProvider(false) {
+		return new ClassPathScanningCandidateComponentProvider(false, this.environment) {
 
 			@Override
 			protected boolean isCandidateComponent(
@@ -373,6 +377,11 @@ class FeignClientsRegistrar implements ImportBeanDefinitionRegistrar,
 				builder.getBeanDefinition());
 	}
 
+	@Override
+	public void setEnvironment(Environment environment) {
+		this.environment = environment;
+	}
+
 	/**
 	 * Helper class to create a {@link TypeFilter} that matches if all the delegates
 	 * match.

spring-cloud-netflix-core/src/test/java/org/springframework/cloud/netflix/feign/testclients/TestClient.java

@@ -0,0 +1,32 @@
+/*
+ *
+ *  * Copyright 2013-2016 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.cloud.netflix.feign.testclients;
+
+import org.springframework.cloud.netflix.feign.FeignClient;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+
+/**
+ * @author Ryan Baxter
+ */
+@FeignClient(name = "localapp")
+public interface TestClient {
+	@RequestMapping(method = RequestMethod.GET, value = "/hello")
+	String getHello();
+}
+

spring-cloud-netflix-core/src/test/java/org/springframework/cloud/netflix/feign/valid/scanning/FeignClientEnvVarTests.java

@@ -0,0 +1,97 @@
+/*
+ *
+ *  * Copyright 2013-2016 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.cloud.netflix.feign.valid.scanning;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.cloud.netflix.feign.EnableFeignClients;
+import org.springframework.cloud.netflix.feign.testclients.TestClient;
+import org.springframework.cloud.netflix.ribbon.RibbonClient;
+import org.springframework.cloud.netflix.ribbon.StaticServerList;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.netflix.loadbalancer.Server;
+import com.netflix.loadbalancer.ServerList;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+/**
+ * @author Ryan Baxter
+ */
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringBootTest(classes = FeignClientEnvVarTests.Application.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT, value = {
+		"spring.application.name=feignclienttest", "feign.httpclient.enabled=false",
+		"basepackage=org.springframework.cloud.netflix.feign.testclients" })
+@DirtiesContext
+public class FeignClientEnvVarTests {
+
+	@Autowired
+	private TestClient testClient;
+
+	@Test
+	public void testSimpleType() {
+		String hello = this.testClient.getHello();
+		assertNotNull("hello was null", hello);
+		assertEquals("first hello didn't match", "hello world 1", hello);
+	}
+
+	@Configuration
+	@EnableAutoConfiguration
+	@RestController
+	@EnableFeignClients(basePackages = {"${basepackage}"})
+	@RibbonClient(name = "localapp", configuration = LocalRibbonClientConfiguration.class)
+	protected static class Application {
+		@RequestMapping(method = RequestMethod.GET, value = "/hello")
+		public String getHello() {
+			return "hello world 1";
+		}
+
+		public static void main(String[] args) {
+			new SpringApplicationBuilder(Application.class)
+					.properties("spring.application.name=feignclienttest",
+							"management.contextPath=/admin")
+					.run(args);
+		}
+	}
+
+	// Load balancer with fixed server list for "local" pointing to localhost
+	@Configuration
+	public static class LocalRibbonClientConfiguration {
+
+		@Value("${local.server.port}")
+		private int port = 0;
+
+		@Bean
+		public ServerList<Server> ribbonServerList() {
+			return new StaticServerList<>(new Server("localhost", this.port));
+		}
+
+	}
+}