Provide remote restart auto-configuration

Provide auto-configuration for remote application update and restart.
Local classpath changes are now monitored via RemoteSpringApplication
and pushed to the remote server.

See gh-3086

spring-boot-developer-tools/src/main/java/org/springframework/boot/developertools/autoconfigure/RemoteDeveloperToolsAutoConfiguration.java

@@ -20,6 +20,8 @@ import java.util.Collection;
 
 import javax.servlet.Filter;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
@@ -33,6 +35,10 @@ import org.springframework.boot.developertools.remote.server.Handler;
 import org.springframework.boot.developertools.remote.server.HandlerMapper;
 import org.springframework.boot.developertools.remote.server.HttpStatusHandler;
 import org.springframework.boot.developertools.remote.server.UrlHandlerMapper;
+import org.springframework.boot.developertools.restart.server.DefaultSourceFolderUrlFilter;
+import org.springframework.boot.developertools.restart.server.HttpRestartServer;
+import org.springframework.boot.developertools.restart.server.HttpRestartServerHandler;
+import org.springframework.boot.developertools.restart.server.SourceFolderUrlFilter;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.http.server.ServerHttpRequest;
@@ -50,6 +56,9 @@ import org.springframework.http.server.ServerHttpRequest;
 @EnableConfigurationProperties(DeveloperToolsProperties.class)
 public class RemoteDeveloperToolsAutoConfiguration {
 
+	private static final Log logger = LogFactory
+			.getLog(RemoteDeveloperToolsAutoConfiguration.class);
+
 	@Autowired
 	private DeveloperToolsProperties properties;
 
@@ -67,4 +76,37 @@ public class RemoteDeveloperToolsAutoConfiguration {
 		return new DispatcherFilter(dispatcher);
 	}
 
+	/**
+	 * Configuration for remote update and restarts.
+	 */
+	@ConditionalOnProperty(prefix = "spring.developertools.remote.restart", name = "enabled", matchIfMissing = true)
+	static class RemoteRestartConfiguration {
+
+		@Autowired
+		private DeveloperToolsProperties properties;
+
+		@Bean
+		@ConditionalOnMissingBean
+		public SourceFolderUrlFilter remoteRestartSourceFolderUrlFilter() {
+			return new DefaultSourceFolderUrlFilter();
+		}
+
+		@Bean
+		@ConditionalOnMissingBean
+		public HttpRestartServer remoteRestartHttpRestartServer(
+				SourceFolderUrlFilter sourceFolderUrlFilter) {
+			return new HttpRestartServer(sourceFolderUrlFilter);
+		}
+
+		@Bean
+		@ConditionalOnMissingBean(name = "remoteRestartHanderMapper")
+		public UrlHandlerMapper remoteRestartHanderMapper(HttpRestartServer server) {
+			String url = this.properties.getRemote().getContextPath() + "/restart";
+			logger.warn("Listening for remote restart updates on " + url);
+			Handler handler = new HttpRestartServerHandler(server);
+			return new UrlHandlerMapper(url, handler);
+		}
+
+	}
+
 }

spring-boot-developer-tools/src/main/java/org/springframework/boot/developertools/autoconfigure/RemoteDeveloperToolsProperties.java

@@ -16,7 +16,6 @@
 
 package org.springframework.boot.developertools.autoconfigure;
 
-
 /**
  * Configuration properties for remote Spring Boot applications.
  *
@@ -34,6 +33,8 @@ public class RemoteDeveloperToolsProperties {
 	 */
 	private String contextPath = DEFAULT_CONTEXT_PATH;
 
+	private Restart restart = new Restart();
+
 	public String getContextPath() {
 		return this.contextPath;
 	}
@@ -42,4 +43,25 @@ public class RemoteDeveloperToolsProperties {
 		this.contextPath = contextPath;
 	}
 
+	public Restart getRestart() {
+		return this.restart;
+	}
+
+	public static class Restart {
+
+		/**
+		 * Enable remote restart
+		 */
+		private boolean enabled = true;
+
+		public boolean isEnabled() {
+			return this.enabled;
+		}
+
+		public void setEnabled(boolean enabled) {
+			this.enabled = enabled;
+		}
+
+	}
+
 }

spring-boot-developer-tools/src/main/java/org/springframework/boot/developertools/remote/client/ClassPathChangeUploader.java

@@ -0,0 +1,145 @@
+/*
+ * Copyright 2012-2015 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.developertools.remote.client;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectOutputStream;
+import java.net.MalformedURLException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.springframework.boot.developertools.classpath.ClassPathChangedEvent;
+import org.springframework.boot.developertools.filewatch.ChangedFile;
+import org.springframework.boot.developertools.filewatch.ChangedFiles;
+import org.springframework.boot.developertools.restart.classloader.ClassLoaderFile;
+import org.springframework.boot.developertools.restart.classloader.ClassLoaderFile.Kind;
+import org.springframework.boot.developertools.restart.classloader.ClassLoaderFiles;
+import org.springframework.context.ApplicationListener;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.client.ClientHttpRequest;
+import org.springframework.http.client.ClientHttpRequestFactory;
+import org.springframework.http.client.ClientHttpResponse;
+import org.springframework.util.Assert;
+import org.springframework.util.FileCopyUtils;
+
+/**
+ * Listens and pushes any classpath updates to a remote endpoint.
+ *
+ * @author Phillip Webb
+ * @since 1.3.0
+ */
+public class ClassPathChangeUploader implements
+		ApplicationListener<ClassPathChangedEvent> {
+
+	private static final Map<ChangedFile.Type, ClassLoaderFile.Kind> TYPE_MAPPINGS;
+	static {
+		Map<ChangedFile.Type, ClassLoaderFile.Kind> map = new HashMap<ChangedFile.Type, ClassLoaderFile.Kind>();
+		map.put(ChangedFile.Type.ADD, ClassLoaderFile.Kind.ADDED);
+		map.put(ChangedFile.Type.DELETE, ClassLoaderFile.Kind.DELETED);
+		map.put(ChangedFile.Type.MODIFY, ClassLoaderFile.Kind.MODIFIED);
+		TYPE_MAPPINGS = Collections.unmodifiableMap(map);
+	}
+
+	private static final Log logger = LogFactory.getLog(ClassPathChangeUploader.class);
+
+	private final URI uri;
+
+	private final ClientHttpRequestFactory requestFactory;
+
+	public ClassPathChangeUploader(String url, ClientHttpRequestFactory requestFactory) {
+		Assert.hasLength(url, "URL must not be empty");
+		Assert.notNull(requestFactory, "RequestFactory must not be null");
+		try {
+			this.uri = new URL(url).toURI();
+		}
+		catch (URISyntaxException ex) {
+			throw new IllegalArgumentException("Malformed URL '" + url + "'");
+		}
+		catch (MalformedURLException ex) {
+			throw new IllegalArgumentException("Malformed URL '" + url + "'");
+		}
+		this.requestFactory = requestFactory;
+	}
+
+	@Override
+	public void onApplicationEvent(ClassPathChangedEvent event) {
+		try {
+			ClassLoaderFiles classLoaderFiles = getClassLoaderFiles(event);
+			ClientHttpRequest request = this.requestFactory.createRequest(this.uri,
+					HttpMethod.POST);
+			byte[] bytes = serialize(classLoaderFiles);
+			HttpHeaders headers = request.getHeaders();
+			headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
+			headers.setContentLength(bytes.length);
+			FileCopyUtils.copy(bytes, request.getBody());
+			logUpload(classLoaderFiles);
+			ClientHttpResponse response = request.execute();
+			Assert.state(response.getStatusCode() == HttpStatus.OK, "Unexpected "
+					+ response.getStatusCode() + " response uploading class files");
+		}
+		catch (IOException ex) {
+			throw new IllegalStateException(ex);
+		}
+	}
+
+	private void logUpload(ClassLoaderFiles classLoaderFiles) {
+		int size = classLoaderFiles.size();
+		logger.info("Uploaded " + size + " class "
+				+ (size == 1 ? "resource" : "resources"));
+	}
+
+	private byte[] serialize(ClassLoaderFiles classLoaderFiles) throws IOException {
+		ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+		ObjectOutputStream objectOutputStream = new ObjectOutputStream(outputStream);
+		objectOutputStream.writeObject(classLoaderFiles);
+		objectOutputStream.close();
+		return outputStream.toByteArray();
+	}
+
+	private ClassLoaderFiles getClassLoaderFiles(ClassPathChangedEvent event)
+			throws IOException {
+		ClassLoaderFiles files = new ClassLoaderFiles();
+		for (ChangedFiles changedFiles : event.getChangeSet()) {
+			String sourceFolder = changedFiles.getSourceFolder().getAbsolutePath();
+			for (ChangedFile changedFile : changedFiles) {
+				files.addFile(sourceFolder, changedFile.getRelativeName(),
+						asClassLoaderFile(changedFile));
+			}
+		}
+		return files;
+	}
+
+	private ClassLoaderFile asClassLoaderFile(ChangedFile changedFile) throws IOException {
+		ClassLoaderFile.Kind kind = TYPE_MAPPINGS.get(changedFile.getType());
+		byte[] bytes = (kind == Kind.DELETED ? null : FileCopyUtils
+				.copyToByteArray(changedFile.getFile()));
+		long lastModified = (kind == Kind.DELETED ? System.currentTimeMillis()
+				: changedFile.getFile().lastModified());
+		return new ClassLoaderFile(kind, lastModified, bytes);
+	}
+
+}

spring-boot-developer-tools/src/main/java/org/springframework/boot/developertools/remote/client/RemoteClientConfiguration.java

@@ -16,10 +16,22 @@
 
 package org.springframework.boot.developertools.remote.client;
 
+import java.net.URL;
+
+import javax.annotation.PostConstruct;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.boot.developertools.autoconfigure.DeveloperToolsProperties;
+import org.springframework.boot.developertools.autoconfigure.RemoteDeveloperToolsProperties;
+import org.springframework.boot.developertools.classpath.ClassPathFileSystemWatcher;
+import org.springframework.boot.developertools.classpath.ClassPathRestartStrategy;
+import org.springframework.boot.developertools.classpath.PatternClassPathRestartStrategy;
+import org.springframework.boot.developertools.restart.DefaultRestartInitializer;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
@@ -37,6 +49,8 @@ import org.springframework.http.client.SimpleClientHttpRequestFactory;
 @EnableConfigurationProperties(DeveloperToolsProperties.class)
 public class RemoteClientConfiguration {
 
+	private static final Log logger = LogFactory.getLog(RemoteClientConfiguration.class);
+
 	@Autowired
 	private DeveloperToolsProperties properties;
 
@@ -53,4 +67,50 @@ public class RemoteClientConfiguration {
 		return new SimpleClientHttpRequestFactory();
 	}
 
+	@PostConstruct
+	private void logWarnings() {
+		RemoteDeveloperToolsProperties remoteProperties = this.properties.getRemote();
+		if (!remoteProperties.getRestart().isEnabled()) {
+			logger.warn("Remote restart is not enabled.");
+		}
+	}
+
+	/**
+	 * Client configuration for remote update and restarts.
+	 */
+	@ConditionalOnProperty(prefix = "spring.developertools.remote.restart", name = "enabled", matchIfMissing = true)
+	static class RemoteRestartClientConfiguration {
+
+		@Autowired
+		private DeveloperToolsProperties properties;
+
+		@Value("${remoteUrl}")
+		private String remoteUrl;
+
+		@Bean
+		public ClassPathFileSystemWatcher classPathFileSystemWatcher() {
+			DefaultRestartInitializer restartInitializer = new DefaultRestartInitializer();
+			URL[] urls = restartInitializer.getInitialUrls(Thread.currentThread());
+			if (urls == null) {
+				urls = new URL[0];
+			}
+			return new ClassPathFileSystemWatcher(classPathRestartStrategy(), urls);
+		}
+
+		@Bean
+		public ClassPathRestartStrategy classPathRestartStrategy() {
+			return new PatternClassPathRestartStrategy(this.properties.getRestart()
+					.getExclude());
+		}
+
+		@Bean
+		public ClassPathChangeUploader classPathChangeUploader(
+				ClientHttpRequestFactory requestFactory) {
+			String url = this.remoteUrl + this.properties.getRemote().getContextPath()
+					+ "/restart";
+			return new ClassPathChangeUploader(url, requestFactory);
+		}
+
+	}
+
 }

spring-boot-developer-tools/src/test/java/org/springframework/boot/developertools/autoconfigure/RemoteDeveloperToolsAutoConfigurationTests.java

@@ -16,18 +16,26 @@
 
 package org.springframework.boot.developertools.autoconfigure;
 
+import java.io.IOException;
+
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
+import org.springframework.beans.factory.NoSuchBeanDefinitionException;
 import org.springframework.boot.autoconfigure.PropertyPlaceholderAutoConfiguration;
 import org.springframework.boot.autoconfigure.web.ServerPropertiesAutoConfiguration;
 import org.springframework.boot.developertools.remote.server.DispatcherFilter;
 import org.springframework.boot.developertools.restart.MockRestarter;
+import org.springframework.boot.developertools.restart.server.HttpRestartServer;
+import org.springframework.boot.developertools.restart.server.SourceFolderUrlFilter;
 import org.springframework.boot.test.EnvironmentTestUtils;
+import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
+import org.springframework.http.server.ServerHttpRequest;
+import org.springframework.http.server.ServerHttpResponse;
 import org.springframework.mock.web.MockFilterChain;
 import org.springframework.mock.web.MockHttpServletRequest;
 import org.springframework.mock.web.MockHttpServletResponse;
@@ -36,6 +44,7 @@ import org.springframework.web.context.support.AnnotationConfigWebApplicationCon
 
 import static org.hamcrest.Matchers.equalTo;
 import static org.junit.Assert.assertThat;
+import static org.mockito.Mockito.mock;
 
 /**
  * Tests for {@link RemoteDeveloperToolsAutoConfiguration}.
@@ -75,6 +84,32 @@ public class RemoteDeveloperToolsAutoConfigurationTests {
 		}
 	}
 
+	@Test
+	public void ignoresUnmappedUrl() throws Exception {
+		loadContext("spring.developertools.remote.enabled:true");
+		DispatcherFilter filter = this.context.getBean(DispatcherFilter.class);
+		this.request.setRequestURI("/restart");
+		filter.doFilter(this.request, this.response, this.chain);
+		assertRestartInvoked(false);
+	}
+
+	@Test
+	public void invokeRestartWithDefaultSetup() throws Exception {
+		loadContext("spring.developertools.remote.enabled:true");
+		DispatcherFilter filter = this.context.getBean(DispatcherFilter.class);
+		this.request.setRequestURI(DEFAULT_CONTEXT_PATH + "/restart");
+		filter.doFilter(this.request, this.response, this.chain);
+		assertRestartInvoked(true);
+	}
+
+	@Test
+	public void disableRestart() throws Exception {
+		loadContext("spring.developertools.remote.enabled:true",
+				"spring.developertools.remote.restart.enabled:false");
+		this.thrown.expect(NoSuchBeanDefinitionException.class);
+		this.context.getBean("remoteRestartHanderMapper");
+	}
+
 	@Test
 	public void developerToolsHealthReturns200() throws Exception {
 		loadContext("spring.developertools.remote.enabled:true");
@@ -85,6 +120,11 @@ public class RemoteDeveloperToolsAutoConfigurationTests {
 		assertThat(this.response.getStatus(), equalTo(200));
 	}
 
+	private void assertRestartInvoked(boolean value) {
+		assertThat(this.context.getBean(MockHttpRestartServer.class).invoked,
+				equalTo(value));
+	}
+
 	private void loadContext(String... properties) {
 		this.context = new AnnotationConfigWebApplicationContext();
 		this.context.setServletContext(new MockServletContext());
@@ -98,5 +138,31 @@ public class RemoteDeveloperToolsAutoConfigurationTests {
 	@Import(RemoteDeveloperToolsAutoConfiguration.class)
 	static class Config {
 
+		@Bean
+		public HttpRestartServer remoteRestartHttpRestartServer() {
+			SourceFolderUrlFilter sourceFolderUrlFilter = mock(SourceFolderUrlFilter.class);
+			return new MockHttpRestartServer(sourceFolderUrlFilter);
+		}
+
+	}
+
+	/**
+	 * Mock {@link HttpRestartServer} implementation.
+	 */
+	static class MockHttpRestartServer extends HttpRestartServer {
+
+		private boolean invoked;
+
+		public MockHttpRestartServer(SourceFolderUrlFilter sourceFolderUrlFilter) {
+			super(sourceFolderUrlFilter);
+		}
+
+		@Override
+		public void handle(ServerHttpRequest request, ServerHttpResponse response)
+				throws IOException {
+			this.invoked = true;
+		}
+
 	}
+
 }

spring-boot-developer-tools/src/test/java/org/springframework/boot/developertools/remote/client/ClassPathChangeUploaderTests.java

@@ -0,0 +1,148 @@
+/*
+ * Copyright 2012-2015 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.developertools.remote.client;
+
+import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.junit.rules.TemporaryFolder;
+import org.springframework.boot.developertools.classpath.ClassPathChangedEvent;
+import org.springframework.boot.developertools.filewatch.ChangedFile;
+import org.springframework.boot.developertools.filewatch.ChangedFile.Type;
+import org.springframework.boot.developertools.filewatch.ChangedFiles;
+import org.springframework.boot.developertools.restart.classloader.ClassLoaderFile;
+import org.springframework.boot.developertools.restart.classloader.ClassLoaderFile.Kind;
+import org.springframework.boot.developertools.restart.classloader.ClassLoaderFiles;
+import org.springframework.boot.developertools.restart.classloader.ClassLoaderFiles.SourceFolder;
+import org.springframework.boot.developertools.test.MockClientHttpRequestFactory;
+import org.springframework.http.HttpStatus;
+import org.springframework.mock.http.client.MockClientHttpRequest;
+import org.springframework.util.FileCopyUtils;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Tests for {@link ClassPathChangeUploader}.
+ *
+ * @author Phillip Webb
+ */
+public class ClassPathChangeUploaderTests {
+
+	@Rule
+	public ExpectedException thrown = ExpectedException.none();
+
+	@Rule
+	public TemporaryFolder temp = new TemporaryFolder();
+
+	private MockClientHttpRequestFactory requestFactory;
+
+	private ClassPathChangeUploader uploader;
+
+	@Before
+	public void setup() {
+		this.requestFactory = new MockClientHttpRequestFactory();
+		this.uploader = new ClassPathChangeUploader("http://localhost/upload",
+				this.requestFactory);
+	}
+
+	@Test
+	public void urlMustNotBeNull() throws Exception {
+		this.thrown.expect(IllegalArgumentException.class);
+		this.thrown.expectMessage("URL must not be empty");
+		new ClassPathChangeUploader(null, this.requestFactory);
+	}
+
+	@Test
+	public void urlMustNotBeEmpty() throws Exception {
+		this.thrown.expect(IllegalArgumentException.class);
+		this.thrown.expectMessage("URL must not be empty");
+		new ClassPathChangeUploader("", this.requestFactory);
+	}
+
+	@Test
+	public void requestFactoryMustNotBeNull() throws Exception {
+		this.thrown.expect(IllegalArgumentException.class);
+		this.thrown.expectMessage("RequestFactory must not be null");
+		new ClassPathChangeUploader("http://localhost:8080", null);
+	}
+
+	@Test
+	public void urlMustNotBeMalformed() throws Exception {
+		this.thrown.expect(IllegalArgumentException.class);
+		this.thrown.expectMessage("Malformed URL 'htttttp:///ttest'");
+		new ClassPathChangeUploader("htttttp:///ttest", this.requestFactory);
+	}
+
+	@Test
+	public void sendsClassLoaderFiles() throws Exception {
+		File sourceFolder = this.temp.newFolder();
+		Set<ChangedFile> files = new LinkedHashSet<ChangedFile>();
+		File file1 = createFile(sourceFolder, "File1");
+		File file2 = createFile(sourceFolder, "File2");
+		File file3 = createFile(sourceFolder, "File3");
+		files.add(new ChangedFile(sourceFolder, file1, Type.ADD));
+		files.add(new ChangedFile(sourceFolder, file2, Type.MODIFY));
+		files.add(new ChangedFile(sourceFolder, file3, Type.DELETE));
+		Set<ChangedFiles> changeSet = new LinkedHashSet<ChangedFiles>();
+		changeSet.add(new ChangedFiles(sourceFolder, files));
+		ClassPathChangedEvent event = new ClassPathChangedEvent(this, changeSet, false);
+		this.requestFactory.willRespond(HttpStatus.OK);
+		this.uploader.onApplicationEvent(event);
+		MockClientHttpRequest request = this.requestFactory.getExecutedRequests().get(0);
+		ClassLoaderFiles classLoaderFiles = deserialize(request.getBodyAsBytes());
+		Collection<SourceFolder> sourceFolders = classLoaderFiles.getSourceFolders();
+		assertThat(sourceFolders.size(), equalTo(1));
+		SourceFolder classSourceFolder = sourceFolders.iterator().next();
+		assertThat(classSourceFolder.getName(), equalTo(sourceFolder.getAbsolutePath()));
+		Iterator<ClassLoaderFile> classFiles = classSourceFolder.getFiles().iterator();
+		assertClassFile(classFiles.next(), "File1", ClassLoaderFile.Kind.ADDED);
+		assertClassFile(classFiles.next(), "File2", ClassLoaderFile.Kind.MODIFIED);
+		assertClassFile(classFiles.next(), null, ClassLoaderFile.Kind.DELETED);
+		assertThat(classFiles.hasNext(), equalTo(false));
+	}
+
+	private void assertClassFile(ClassLoaderFile file, String content, Kind kind) {
+		assertThat(file.getContents(),
+				equalTo(content == null ? null : content.getBytes()));
+		assertThat(file.getKind(), equalTo(kind));
+	}
+
+	private File createFile(File sourceFolder, String name) throws IOException {
+		File file = new File(sourceFolder, name);
+		FileCopyUtils.copy(name.getBytes(), file);
+		return file;
+	}
+
+	private ClassLoaderFiles deserialize(byte[] bytes) throws IOException,
+			ClassNotFoundException {
+		ObjectInputStream objectInputStream = new ObjectInputStream(
+				new ByteArrayInputStream(bytes));
+		return (ClassLoaderFiles) objectInputStream.readObject();
+	}
+
+}

spring-boot-developer-tools/src/test/java/org/springframework/boot/developertools/remote/client/RemoteClientConfigurationTests.java

@@ -72,6 +72,13 @@ public class RemoteClientConfigurationTests {
 		}
 	}
 
+	@Test
+	public void warnIfRestartDisabled() throws Exception {
+		configure("spring.developertools.remote.restart.enabled:false");
+		assertThat(this.output.toString(),
+				containsString("Remote restart is not enabled"));
+	}
+
 	@Test
 	public void doesntWarnIfUsingHttps() throws Exception {
 		configureWithRemoteUrl("https://localhost");

spring-boot-developer-tools/src/test/java/org/springframework/boot/developertools/test/MockClientHttpRequestFactory.java

@@ -0,0 +1,133 @@
+/*
+ * Copyright 2012-2015 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.developertools.test;
+
+import java.io.IOException;
+import java.net.URI;
+import java.util.ArrayDeque;
+import java.util.ArrayList;
+import java.util.Deque;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicLong;
+
+import org.springframework.http.HttpMethod;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.client.ClientHttpRequest;
+import org.springframework.http.client.ClientHttpRequestFactory;
+import org.springframework.http.client.ClientHttpResponse;
+import org.springframework.mock.http.client.MockClientHttpRequest;
+import org.springframework.mock.http.client.MockClientHttpResponse;
+
+/**
+ * Mock {@link ClientHttpRequestFactory}.
+ *
+ * @author Phillip Webb
+ */
+public class MockClientHttpRequestFactory implements ClientHttpRequestFactory {
+
+	private AtomicLong seq = new AtomicLong();
+
+	private Deque<Response> responses = new ArrayDeque<Response>();
+
+	private List<MockClientHttpRequest> executedRequests = new ArrayList<MockClientHttpRequest>();
+
+	@Override
+	public ClientHttpRequest createRequest(URI uri, HttpMethod httpMethod)
+			throws IOException {
+		return new MockRequest(uri, httpMethod);
+	}
+
+	public void willRespond(HttpStatus... response) {
+		for (HttpStatus status : response) {
+			this.responses.add(new Response(0, null, status));
+		}
+	}
+
+	public void willRespond(String... response) {
+		for (String payload : response) {
+			this.responses.add(new Response(0, payload.getBytes(), HttpStatus.OK));
+		}
+	}
+
+	public void willRespondAfterDelay(int delay, HttpStatus status) {
+		this.responses.add(new Response(delay, null, status));
+	}
+
+	public List<MockClientHttpRequest> getExecutedRequests() {
+		return this.executedRequests;
+	}
+
+	private class MockRequest extends MockClientHttpRequest {
+
+		public MockRequest(URI uri, HttpMethod httpMethod) {
+			super(httpMethod, uri);
+		}
+
+		@Override
+		protected ClientHttpResponse executeInternal() throws IOException {
+			MockClientHttpRequestFactory.this.executedRequests.add(this);
+			Response response = MockClientHttpRequestFactory.this.responses.pollFirst();
+			if (response == null) {
+				response = new Response(0, null, HttpStatus.GONE);
+			}
+			return response.asHttpResponse(MockClientHttpRequestFactory.this.seq);
+		}
+
+	}
+
+	static class Response {
+
+		private final int delay;
+
+		private final byte[] payload;
+
+		private final HttpStatus status;
+
+		public Response(int delay, byte[] payload, HttpStatus status) {
+			this.delay = delay;
+			this.payload = payload;
+			this.status = status;
+		}
+
+		public ClientHttpResponse asHttpResponse(AtomicLong seq) {
+			MockClientHttpResponse httpResponse = new MockClientHttpResponse(
+					this.payload, this.status);
+			waitForDelay();
+			if (this.payload != null) {
+				httpResponse.getHeaders().setContentLength(this.payload.length);
+				httpResponse.getHeaders().setContentType(
+						MediaType.APPLICATION_OCTET_STREAM);
+				httpResponse.getHeaders().add("x-seq",
+						Long.toString(seq.incrementAndGet()));
+			}
+			return httpResponse;
+		}
+
+		private void waitForDelay() {
+			if (this.delay > 0) {
+				try {
+					Thread.sleep(this.delay);
+				}
+				catch (InterruptedException ex) {
+				}
+			}
+		}
+
+	}
+
+}