Register the LoggingSystem in the ApplicationContext

Closes gh-4159

Author: snicoll

spring-boot/src/main/java/org/springframework/boot/logging/LoggingApplicationListener.java

@@ -24,10 +24,12 @@
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
+import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
 import org.springframework.boot.ApplicationPid;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.bind.RelaxedPropertyResolver;
 import org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent;
+import org.springframework.boot.context.event.ApplicationPreparedEvent;
 import org.springframework.boot.context.event.ApplicationStartedEvent;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationEvent;
@@ -107,6 +109,11 @@ public class LoggingApplicationListener implements GenericApplicationListener {
 	 */
 	public static final String EXCEPTION_CONVERSION_WORD = "LOG_EXCEPTION_CONVERSION_WORD";
 
+	/**
+	 * The name of the {@link LoggingSystem} bean.
+	 */
+	private static final String LOGGING_SYSTEM_BEAN_NAME = "springBootLoggingSystem";
+
 	private static MultiValueMap<LogLevel, String> LOG_LEVEL_LOGGERS;
 
 	private static AtomicBoolean shutdownHookRegistered = new AtomicBoolean(false);
@@ -123,7 +130,8 @@ public class LoggingApplicationListener implements GenericApplicationListener {
 	}
 
 	private static Class<?>[] EVENT_TYPES = { ApplicationStartedEvent.class,
-			ApplicationEnvironmentPreparedEvent.class, ContextClosedEvent.class };
+			ApplicationEnvironmentPreparedEvent.class, ApplicationPreparedEvent.class,
+			ContextClosedEvent.class };
 
 	private static Class<?>[] SOURCE_TYPES = { SpringApplication.class,
 			ApplicationContext.class };
@@ -168,6 +176,9 @@ else if (event instanceof ApplicationEnvironmentPreparedEvent) {
 			onApplicationEnvironmentPreparedEvent(
 					(ApplicationEnvironmentPreparedEvent) event);
 		}
+		else if (event instanceof ApplicationPreparedEvent) {
+			onApplicationPreparedEvent((ApplicationPreparedEvent) event);
+		}
 		else if (event instanceof ContextClosedEvent) {
 			onContextClosedEvent();
 		}
@@ -188,6 +199,13 @@ private void onApplicationEnvironmentPreparedEvent(
 		initialize(event.getEnvironment(), event.getSpringApplication().getClassLoader());
 	}
 
+	private void onApplicationPreparedEvent(ApplicationPreparedEvent event) {
+		ConfigurableListableBeanFactory beanFactory = event.getApplicationContext().getBeanFactory();
+		if (!beanFactory.containsBean(LOGGING_SYSTEM_BEAN_NAME)) {
+			beanFactory.registerSingleton(LOGGING_SYSTEM_BEAN_NAME, this.loggingSystem);
+		}
+	}
+
 	private void onContextClosedEvent() {
 		if (this.loggingSystem != null) {
 			this.loggingSystem.cleanUp();

spring-boot/src/test/java/org/springframework/boot/logging/LoggingApplicationListenerIntegrationTests.java

@@ -0,0 +1,62 @@
+/*
+ * 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.logging;
+
+import org.junit.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.stereotype.Component;
+
+import static org.junit.Assert.assertNotNull;
+
+/**
+ * Integration tests for {@link LoggingApplicationListener}.
+ *
+ * @author Stephane Nicoll
+ */
+public class LoggingApplicationListenerIntegrationTests {
+
+
+	@Test
+	public void loggingSystemRegisteredInTheContext() {
+		ConfigurableApplicationContext context = new SpringApplicationBuilder(
+				SampleService.class).web(false).run();
+		try {
+			SampleService service = context.getBean(SampleService.class);
+			assertNotNull(service.loggingSystem);
+		}
+		finally {
+			context.close();
+		}
+	}
+
+
+	@Component
+	static class SampleService {
+
+		private final LoggingSystem loggingSystem;
+
+		@Autowired
+		SampleService(LoggingSystem loggingSystem) {
+			this.loggingSystem = loggingSystem;
+		}
+	}
+
+}
+