Add support for Hazelcast YAML configuration

Since Hazlecast 3.12, YAML configuration format is supported in
addition to XML. Therefore, this change makes Spring Boot automatically
discover not only `hazelcast.xml` (and `hazelcast-client.xml`), but also
`hazelcast.yaml` (and `hazelcast-client.yaml`).

See gh-16632

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/hazelcast/HazelcastClientConfiguration.java

@@ -79,7 +79,8 @@ class HazelcastClientConfiguration {
 
 		ConfigAvailableCondition() {
 			super(CONFIG_SYSTEM_PROPERTY, "file:./hazelcast-client.xml",
-					"classpath:/hazelcast-client.xml");
+					"classpath:/hazelcast-client.xml", "file:./hazelcast-client.yaml",
+					"classpath:/hazelcast-client.yaml");
 		}
 
 	}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/hazelcast/HazelcastClientFactory.java

@@ -22,6 +22,7 @@ import java.net.URL;
 import com.hazelcast.client.HazelcastClient;
 import com.hazelcast.client.config.ClientConfig;
 import com.hazelcast.client.config.XmlClientConfigBuilder;
+import com.hazelcast.client.config.YamlClientConfigBuilder;
 import com.hazelcast.core.HazelcastInstance;
 
 import org.springframework.core.io.Resource;
@@ -59,7 +60,14 @@ public class HazelcastClientFactory {
 	private ClientConfig getClientConfig(Resource clientConfigLocation)
 			throws IOException {
 		URL configUrl = clientConfigLocation.getURL();
-		return new XmlClientConfigBuilder(configUrl).build();
+		String configFileName = configUrl.getFile();
+
+		if (configFileName.endsWith(".xml")) {
+			return new XmlClientConfigBuilder(configUrl).build();
+		}
+		else {
+			return new YamlClientConfigBuilder(configUrl).build();
+		}
 	}
 
 	/**

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/hazelcast/HazelcastInstanceFactory.java

@@ -21,6 +21,7 @@ import java.net.URL;
 
 import com.hazelcast.config.Config;
 import com.hazelcast.config.XmlConfigBuilder;
+import com.hazelcast.config.YamlConfigBuilder;
 import com.hazelcast.core.Hazelcast;
 import com.hazelcast.core.HazelcastInstance;
 
@@ -61,7 +62,7 @@ public class HazelcastInstanceFactory {
 
 	private Config getConfig(Resource configLocation) throws IOException {
 		URL configUrl = configLocation.getURL();
-		Config config = new XmlConfigBuilder(configUrl).build();
+		Config config = createConfig(configUrl);
 		if (ResourceUtils.isFileURL(configUrl)) {
 			config.setConfigurationFile(configLocation.getFile());
 		}
@@ -71,6 +72,14 @@ public class HazelcastInstanceFactory {
 		return config;
 	}
 
+	private static Config createConfig(URL configUrl) throws IOException {
+		String configFileName = configUrl.getFile();
+		if (configFileName.endsWith(".xml")) {
+			return new XmlConfigBuilder(configUrl).build();
+		}
+		return new YamlConfigBuilder(configUrl).build();
+	}
+
 	/**
 	 * Get the {@link HazelcastInstance}.
 	 * @return the {@link HazelcastInstance}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/hazelcast/HazelcastServerConfiguration.java

@@ -77,7 +77,8 @@ class HazelcastServerConfiguration {
 
 		ConfigAvailableCondition() {
 			super(CONFIG_SYSTEM_PROPERTY, "file:./hazelcast.xml",
-					"classpath:/hazelcast.xml");
+					"classpath:/hazelcast.xml", "file:./hazelcast.yaml",
+					"classpath:/hazelcast.yaml");
 		}
 
 	}

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/hazelcast/HazelcastAutoConfigurationClientTests.java

@@ -28,6 +28,7 @@ import org.junit.Test;
 
 import org.springframework.beans.factory.BeanCreationException;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.test.context.assertj.AssertableApplicationContext;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -63,35 +64,58 @@ public class HazelcastAutoConfigurationClientTests {
 			.withConfiguration(AutoConfigurations.of(HazelcastAutoConfiguration.class));
 
 	@Test
-	public void systemProperty() {
-		this.contextRunner
-				.withSystemProperties(HazelcastClientConfiguration.CONFIG_SYSTEM_PROPERTY
-						+ "=classpath:org/springframework/boot/autoconfigure/hazelcast/"
-						+ "hazelcast-client-specific.xml")
-				.run((context) -> assertThat(context).getBean(HazelcastInstance.class)
-						.isInstanceOf(HazelcastInstance.class)
-						.has(nameStartingWith("hz.client_")));
+	public void systemPropertyWithXml() {
+		systemProperty(HazelcastClientConfiguration.CONFIG_SYSTEM_PROPERTY
+				+ "=classpath:org/springframework/boot/autoconfigure/hazelcast/"
+				+ "hazelcast-client-specific.xml");
 	}
 
 	@Test
-	public void explicitConfigFile() {
-		this.contextRunner
-				.withPropertyValues(
-						"spring.hazelcast.config=org/springframework/boot/autoconfigure/"
-								+ "hazelcast/hazelcast-client-specific.xml")
-				.run((context) -> assertThat(context).getBean(HazelcastInstance.class)
-						.isInstanceOf(HazelcastClientProxy.class)
-						.has(nameStartingWith("hz.client_")));
+	public void systemPropertyWithYaml() {
+		systemProperty(HazelcastClientConfiguration.CONFIG_SYSTEM_PROPERTY
+				+ "=classpath:org/springframework/boot/autoconfigure/hazelcast/"
+				+ "hazelcast-client-specific.yaml");
+	}
+
+	private void systemProperty(String systemProperty) {
+		this.contextRunner.withSystemProperties(systemProperty)
+				.run((context) -> assertHazelcastClientSpecific(context));
 	}
 
 	@Test
-	public void explicitConfigUrl() {
-		this.contextRunner
-				.withPropertyValues(
-						"spring.hazelcast.config=hazelcast-client-default.xml")
-				.run((context) -> assertThat(context).getBean(HazelcastInstance.class)
-						.isInstanceOf(HazelcastClientProxy.class)
-						.has(nameStartingWith("hz.client_")));
+	public void explicitConfigFileWithXml() {
+		propertyValues("spring.hazelcast.config=org/springframework/boot/autoconfigure/"
+				+ "hazelcast/hazelcast-client-specific.xml");
+	}
+
+	@Test
+	public void explicitConfigFileWithYaml() {
+		propertyValues("spring.hazelcast.config=org/springframework/boot/autoconfigure/"
+				+ "hazelcast/hazelcast-client-specific.yaml");
+	}
+
+	@Test
+	public void explicitConfigUrlWithXml() {
+		propertyValues("spring.hazelcast.config=classpath:org/springframework/"
+				+ "boot/autoconfigure/hazelcast/hazelcast-client-specific.xml");
+	}
+
+	@Test
+	public void explicitConfigUrlWithYaml() {
+		propertyValues("spring.hazelcast.config=classpath:org/springframework/"
+				+ "boot/autoconfigure/hazelcast/hazelcast-client-specific.yaml");
+	}
+
+	private void propertyValues(String propertyValues) {
+		this.contextRunner.withPropertyValues(propertyValues)
+				.run((context) -> assertHazelcastClientSpecific(context));
+	}
+
+	private static void assertHazelcastClientSpecific(
+			AssertableApplicationContext context) {
+		assertThat(context).getBean(HazelcastInstance.class)
+				.isInstanceOf(HazelcastInstance.class)
+				.has(labelEqualTo("configured-client"));
 	}
 
 	@Test
@@ -111,9 +135,10 @@ public class HazelcastAutoConfigurationClientTests {
 						.isInstanceOf(HazelcastClientProxy.class));
 	}
 
-	private Condition<HazelcastInstance> nameStartingWith(String prefix) {
-		return new Condition<>((o) -> o.getName().startsWith(prefix),
-				"Name starts with " + prefix);
+	private static Condition<HazelcastInstance> labelEqualTo(String label) {
+		return new Condition<>((o) -> ((HazelcastClientProxy) o).getClientConfig()
+				.getLabels().stream().anyMatch((e) -> e.equals(label)),
+				"Label equals to " + label);
 	}
 
 	@Configuration(proxyBeanMethods = false)

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/hazelcast/HazelcastAutoConfigurationServerTests.java

@@ -27,6 +27,7 @@ import org.junit.runner.RunWith;
 
 import org.springframework.beans.factory.BeanCreationException;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.test.context.assertj.AssertableApplicationContext;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.boot.testsupport.runner.classpath.ClassPathExclusions;
 import org.springframework.boot.testsupport.runner.classpath.ModifiedClassPathRunner;
@@ -59,39 +60,56 @@ public class HazelcastAutoConfigurationServerTests {
 	}
 
 	@Test
-	public void systemProperty() {
-		this.contextRunner
-				.withSystemProperties(HazelcastServerConfiguration.CONFIG_SYSTEM_PROPERTY
-						+ "=classpath:org/springframework/boot/autoconfigure/hazelcast/hazelcast-specific.xml")
-				.run((context) -> {
-					Config config = context.getBean(HazelcastInstance.class).getConfig();
-					assertThat(config.getQueueConfigs().keySet()).containsOnly("foobar");
-				});
+	public void systemPropertyWithXml() {
+		systemProperty(HazelcastServerConfiguration.CONFIG_SYSTEM_PROPERTY
+				+ "=classpath:org/springframework/boot/autoconfigure/hazelcast/hazelcast-specific.xml");
+	}
+
+	@Test
+	public void systemPropertyWithYaml() {
+		systemProperty(HazelcastServerConfiguration.CONFIG_SYSTEM_PROPERTY
+				+ "=classpath:org/springframework/boot/autoconfigure/hazelcast/hazelcast-specific.yaml");
+	}
+
+	private void systemProperty(String systemProperties) {
+		this.contextRunner.withSystemProperties(systemProperties)
+				.run((context) -> assertHazelcastSpecific(context));
 	}
 
 	@Test
-	public void explicitConfigFile() {
-		this.contextRunner.withPropertyValues(
+	public void explicitConfigFileWithXml() {
+		propertyValues(
 				"spring.hazelcast.config=org/springframework/boot/autoconfigure/hazelcast/"
-						+ "hazelcast-specific.xml")
-				.run((context) -> {
-					Config config = context.getBean(HazelcastInstance.class).getConfig();
-					assertThat(config.getConfigurationFile())
-							.isEqualTo(new ClassPathResource(
-									"org/springframework/boot/autoconfigure/hazelcast"
-											+ "/hazelcast-specific.xml").getFile());
-				});
+						+ "hazelcast-specific.xml");
 	}
 
 	@Test
-	public void explicitConfigUrl() {
-		this.contextRunner
-				.withPropertyValues("spring.hazelcast.config=hazelcast-default.xml")
-				.run((context) -> {
-					Config config = context.getBean(HazelcastInstance.class).getConfig();
-					assertThat(config.getConfigurationUrl()).isEqualTo(
-							new ClassPathResource("hazelcast-default.xml").getURL());
-				});
+	public void explicitConfigFileWithYaml() {
+		propertyValues(
+				"spring.hazelcast.config=org/springframework/boot/autoconfigure/hazelcast/"
+						+ "hazelcast-specific.yaml");
+	}
+
+	@Test
+	public void explicitConfigUrlWithXml() {
+		propertyValues("spring.hazelcast.config=classpath:org/springframework/"
+				+ "boot/autoconfigure/hazelcast/hazelcast-specific.xml");
+	}
+
+	@Test
+	public void explicitConfigUrlWithYaml() {
+		propertyValues("spring.hazelcast.config=classpath:org/springframework/"
+				+ "boot/autoconfigure/hazelcast/hazelcast-specific.yaml");
+	}
+
+	private void propertyValues(String propertyValues) {
+		this.contextRunner.withPropertyValues(propertyValues)
+				.run((context) -> assertHazelcastSpecific(context));
+	}
+
+	private static void assertHazelcastSpecific(AssertableApplicationContext context) {
+		Config config = context.getBean(HazelcastInstance.class).getConfig();
+		assertThat(config.getMapConfigs().keySet()).containsOnly("foobar");
 	}
 
 	@Test

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/hazelcast/HazelcastAutoConfigurationTests.java

@@ -39,6 +39,8 @@ public class HazelcastAutoConfigurationTests {
 	@Test
 	public void defaultConfigFile() {
 		// no hazelcast-client.xml and hazelcast.xml is present in root classpath
+		// this also asserts that XML has priority over YAML
+		// as both hazelcast.yaml and hazelcast.xml in test classpath.
 		this.contextRunner.run((context) -> {
 			Config config = context.getBean(HazelcastInstance.class).getConfig();
 			assertThat(config.getConfigurationUrl())

spring-boot-project/spring-boot-autoconfigure/src/test/resources/hazelcast.yaml

@@ -0,0 +1,5 @@
+hazelcast:
+  network:
+    join:
+      multicast:
+        enabled: false

spring-boot-project/spring-boot-autoconfigure/src/test/resources/org/springframework/boot/autoconfigure/hazelcast/hazelcast-client-specific.xml

@@ -2,5 +2,8 @@
 <hazelcast-client xmlns="http://www.hazelcast.com/schema/client-config"
 		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 		xsi:schemaLocation="http://www.hazelcast.com/schema/client-config hazelcast-client-config-3.12.xsd">
+	<client-labels>
+		<label>configured-client</label>
+	</client-labels>
 
 </hazelcast-client>

spring-boot-project/spring-boot-autoconfigure/src/test/resources/org/springframework/boot/autoconfigure/hazelcast/hazelcast-client-specific.yaml

@@ -0,0 +1,3 @@
+hazelcast-client:
+  client-labels:
+    - configured-client

spring-boot-project/spring-boot-autoconfigure/src/test/resources/org/springframework/boot/autoconfigure/hazelcast/hazelcast-specific.yaml

@@ -0,0 +1,10 @@
+hazelcast:
+  network:
+    join:
+      multicast:
+        enabled: false
+
+  map:
+    foobar:
+      time-to-live-seconds: 3600
+      max-idle-seconds: 600