Merge pull request #20729 from gurbuzali

* pr/20729:
  Polish "Disable Hazelcast auto-configuration when Jet is present"
  Disable Hazelcast auto-configuration when Jet is present

Closes gh-20729

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

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -19,13 +19,22 @@ package org.springframework.boot.autoconfigure.hazelcast;
 import com.hazelcast.core.HazelcastInstance;
 
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage.Builder;
+import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
+import org.springframework.boot.autoconfigure.hazelcast.HazelcastAutoConfiguration.HazelcastDataGridCondition;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.ConditionContext;
+import org.springframework.context.annotation.Conditional;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
+import org.springframework.core.io.Resource;
+import org.springframework.core.type.AnnotatedTypeMetadata;
 
 /**
- * {@link EnableAutoConfiguration Auto-configuration} for Hazelcast. Creates a
+ * {@link EnableAutoConfiguration Auto-configuration} for Hazelcast IMDG. Creates a
  * {@link HazelcastInstance} based on explicit configuration or when a default
  * configuration file is found in the environment.
  *
@@ -35,9 +44,26 @@ import org.springframework.context.annotation.Import;
  * @see HazelcastConfigResourceCondition
  */
 @Configuration(proxyBeanMethods = false)
+@Conditional(HazelcastDataGridCondition.class)
 @ConditionalOnClass(HazelcastInstance.class)
 @EnableConfigurationProperties(HazelcastProperties.class)
 @Import({ HazelcastClientConfiguration.class, HazelcastServerConfiguration.class })
 public class HazelcastAutoConfiguration {
 
+	static class HazelcastDataGridCondition extends SpringBootCondition {
+
+		private static final String HAZELCAST_JET_CONFIG_FILE = "classpath:/hazelcast-jet-default.yaml";
+
+		@Override
+		public ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeMetadata metadata) {
+			Builder message = ConditionMessage.forCondition(HazelcastDataGridCondition.class.getSimpleName());
+			Resource resource = context.getResourceLoader().getResource(HAZELCAST_JET_CONFIG_FILE);
+			if (resource.exists()) {
+				return ConditionOutcome.noMatch(message.because("Found Hazelcast Jet on the classpath"));
+			}
+			return ConditionOutcome.match(message.because("Hazelcast Jet not found on the classpath"));
+		}
+
+	}
+
 }

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

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -16,6 +16,10 @@
 
 package org.springframework.boot.autoconfigure.hazelcast;
 
+import java.io.IOException;
+import java.net.URL;
+import java.net.URLClassLoader;
+
 import com.hazelcast.config.Config;
 import com.hazelcast.core.HazelcastInstance;
 import org.junit.jupiter.api.Test;
@@ -23,6 +27,7 @@ import org.junit.jupiter.api.Test;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.Resource;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -47,4 +52,41 @@ class HazelcastAutoConfigurationTests {
 		});
 	}
 
+	@Test
+	void hazelcastInstanceNotCreatedWhenJetIsPresent() {
+		this.contextRunner.withClassLoader(new JetConfigClassLoader())
+				.run((context) -> assertThat(context).doesNotHaveBean(HazelcastInstance.class));
+	}
+
+	/**
+	 * A test {link {@link URLClassLoader} that emulates the default Hazelcast Jet
+	 * configuration file exists on the classpath.
+	 */
+	static class JetConfigClassLoader extends URLClassLoader {
+
+		private static final Resource FALLBACK = new ClassPathResource("hazelcast.yaml");
+
+		JetConfigClassLoader() {
+			super(new URL[0], JetConfigClassLoader.class.getClassLoader());
+		}
+
+		@Override
+		public URL getResource(String name) {
+			if (name.equals("hazelcast-jet-default.yaml")) {
+				return getEmulatedJestConfigUrl();
+			}
+			return super.getResource(name);
+		}
+
+		private URL getEmulatedJestConfigUrl() {
+			try {
+				return FALLBACK.getURL();
+			}
+			catch (IOException ex) {
+				throw new IllegalArgumentException(ex);
+			}
+		}
+
+	}
+
 }