Add Integration Tests support for configuring, bootstrapping and properly closing a Spring ApplicationContext.

spring-data-geode-test/src/main/java/org/springframework/data/gemfire/tests/integration/SpringApplicationContextIntegrationTestsSupport.java

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+/*
+ *  Copyright 2018 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.data.gemfire.tests.integration;
+
+import java.util.Optional;
+
+import org.junit.AfterClass;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
+/**
+ * The {@link SpringApplicationContextIntegrationTestsSupport} class is an extension of {@link IntegrationTestsSupport}
+ * for writing Integration Tests involving a Spring {@link ApplicationContext}.
+ *
+ * This class contains functionality common to all Integration Tests involving a Spring {@link ApplicationContext}
+ * and can be extended to create, acquire a reference and close the {@link ApplicationContext}
+ * on test class completion, properly.
+ *
+ * @author John Blum
+ * @see org.springframework.context.ApplicationContext
+ * @see org.springframework.context.ConfigurableApplicationContext
+ * @see org.springframework.context.annotation.AnnotationConfigApplicationContext
+ * @see org.springframework.data.gemfire.tests.integration.IntegrationTestsSupport
+ * @since 1.0.0
+ */
+@SuppressWarnings("unused")
+public abstract class SpringApplicationContextIntegrationTestsSupport extends IntegrationTestsSupport {
+
+	private volatile ConfigurableApplicationContext applicationContext;
+
+	@AfterClass
+	public void closeApplicationContext() {
+		Optional.ofNullable(this.applicationContext).ifPresent(ConfigurableApplicationContext::close);
+	}
+
+	protected ConfigurableApplicationContext newApplicationContext(Class<?>... annotatedClasses) {
+
+		AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext();
+
+		applicationContext.register(annotatedClasses);
+		applicationContext.registerShutdownHook();
+		applicationContext.refresh();
+
+		this.applicationContext = applicationContext;
+
+		return applicationContext;
+	}
+
+	@SuppressWarnings("unchecked")
+	protected <T extends ConfigurableApplicationContext> T getApplicationContext() {
+		return (T) this.applicationContext;
+	}
+
+	protected <T> T getBean(Class<T> requiredType) {
+		return getApplicationContext().getBean(requiredType);
+	}
+
+	protected <T> T getBean(String beanName, Class<T> requiredType) {
+		return getApplicationContext().getBean(beanName, requiredType);
+	}
+}