Add support for spring-devtools.properties

Allow `META-INF/spring-devtools.properties` files to be used by
application developers to declare is specific jars should be included
or excluded from the RestartClassLoader.

A typical example where this might be used is a company that develops
it's own set of internal JARs that are used by developers but not
usually imported into their IDE.

See gh-3316

spring-boot-devtools/src/test/java/org/springframework/boot/devtools/settings/DevToolsSettingsTests.java

@@ -0,0 +1,81 @@
+/*
+ * 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.devtools.settings;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URL;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * Tests for {@link DevToolsSettings}.
+ *
+ * @author Phillip Webb
+ */
+public class DevToolsSettingsTests {
+
+	@Rule
+	public TemporaryFolder temporaryFolder = new TemporaryFolder();
+
+	private static final String ROOT = DevToolsSettingsTests.class.getPackage().getName()
+			.replace(".", "/") + "/";
+
+	@Test
+	public void includePatterns() throws Exception {
+		DevToolsSettings settings = DevToolsSettings
+				.load(ROOT + "spring-devtools-include.properties");
+		assertThat(settings.isRestartInclude(new URL("file://test/a")), equalTo(true));
+		assertThat(settings.isRestartInclude(new URL("file://test/b")), equalTo(true));
+		assertThat(settings.isRestartInclude(new URL("file://test/c")), equalTo(false));
+	}
+
+	@Test
+	public void excludePatterns() throws Exception {
+		DevToolsSettings settings = DevToolsSettings
+				.load(ROOT + "spring-devtools-exclude.properties");
+		assertThat(settings.isRestartExclude(new URL("file://test/a")), equalTo(true));
+		assertThat(settings.isRestartExclude(new URL("file://test/b")), equalTo(true));
+		assertThat(settings.isRestartExclude(new URL("file://test/c")), equalTo(false));
+	}
+
+	@Test
+	public void defaultIncludePatterns() throws Exception {
+		DevToolsSettings settings = DevToolsSettings.get();
+		assertTrue(settings.isRestartExclude(makeUrl("spring-boot")));
+		assertTrue(settings.isRestartExclude(makeUrl("spring-boot-autoconfigure")));
+		assertTrue(settings.isRestartExclude(makeUrl("spring-boot-actuator")));
+		assertTrue(settings.isRestartExclude(makeUrl("spring-boot-starter")));
+		assertTrue(settings.isRestartExclude(makeUrl("spring-boot-starter-some-thing")));
+	}
+
+	private URL makeUrl(String name) throws IOException {
+		File file = this.temporaryFolder.newFolder();
+		file = new File(file, name);
+		file = new File(file, "target");
+		file = new File(file, "classes");
+		file.mkdirs();
+		return file.toURI().toURL();
+	}
+
+}

spring-boot-devtools/src/test/resources/org/springframework/boot/devtools/settings/spring-devtools-exclude.properties

@@ -0,0 +1,2 @@
+restart.exclude.a=a.*
+restart.exclude.b=b.*

spring-boot-devtools/src/test/resources/org/springframework/boot/devtools/settings/spring-devtools-include.properties

@@ -0,0 +1,2 @@
+restart.include.a=a.*
+restart.include.b=b.*