Merge pull request #15954 from nosan

* pr/15954:
  Polish "Expose Tomcat AccessLog Max days property"
  Expose Tomcat AccessLog Max days property

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/ServerProperties.java

 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -593,6 +593,11 @@ public class ServerProperties {
 			 */
 			private boolean renameOnRotate = false;
 
+			/**
+			 * Number of days to retain the access log files before they are removed.
+			 */
+			private int maxDays = -1;
+
 			/**
 			 * Date format to place in the log file name.
 			 */
@@ -665,6 +670,14 @@ public class ServerProperties {
 				this.renameOnRotate = renameOnRotate;
 			}
 
+			public int getMaxDays() {
+				return this.maxDays;
+			}
+
+			public void setMaxDays(int maxDays) {
+				this.maxDays = maxDays;
+			}
+
 			public String getFileDateFormat() {
 				return this.fileDateFormat;
 			}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/embedded/TomcatWebServerFactoryCustomizer.java

 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -258,6 +258,7 @@ public class TomcatWebServerFactoryCustomizer implements
 		valve.setPrefix(tomcatProperties.getAccesslog().getPrefix());
 		valve.setSuffix(tomcatProperties.getAccesslog().getSuffix());
 		valve.setRenameOnRotate(tomcatProperties.getAccesslog().isRenameOnRotate());
+		valve.setMaxDays(tomcatProperties.getAccesslog().getMaxDays());
 		valve.setFileDateFormat(tomcatProperties.getAccesslog().getFileDateFormat());
 		valve.setRequestAttributesEnabled(
 				tomcatProperties.getAccesslog().isRequestAttributesEnabled());

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/embedded/TomcatWebServerFactoryCustomizerTests.java

 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -325,6 +325,24 @@ public class TomcatWebServerFactoryCustomizerTests {
 		assertThat(factory.getEngineValves()).isEmpty();
 	}
 
+	@Test
+	public void accessLogMaxDaysDefault() {
+		bind("server.tomcat.accesslog.enabled=true");
+		TomcatServletWebServerFactory factory = customizeAndGetFactory();
+		assertThat(((AccessLogValve) factory.getEngineValves().iterator().next())
+				.getMaxDays()).isEqualTo(
+						this.serverProperties.getTomcat().getAccesslog().getMaxDays());
+	}
+
+	@Test
+	public void accessLoMaxDaysCanBeRedefined() {
+		bind("server.tomcat.accesslog.enabled=true",
+				"server.tomcat.accesslog.max-days=20");
+		TomcatServletWebServerFactory factory = customizeAndGetFactory();
+		assertThat(((AccessLogValve) factory.getEngineValves().iterator().next())
+				.getMaxDays()).isEqualTo(20);
+	}
+
 	private void bind(String... inlinedProperties) {
 		TestPropertySourceUtils.addInlinedPropertiesToEnvironment(this.environment,
 				inlinedProperties);

spring-boot-project/spring-boot-docs/src/main/asciidoc/appendix/application-properties.adoc

@@ -255,6 +255,7 @@ content into your application. Rather, pick only the properties that you need.
 	server.tomcat.accesslog.directory=logs # Directory in which log files are created. Can be absolute or relative to the Tomcat base dir.
 	server.tomcat.accesslog.enabled=false # Enable access log.
 	server.tomcat.accesslog.file-date-format=.yyyy-MM-dd # Date format to place in the log file name.
+	server.tomcat.accesslog.max-days=-1# Number of days to retain the access log files before they are removed.
 	server.tomcat.accesslog.pattern=common # Format pattern for access logs.
 	server.tomcat.accesslog.prefix=access_log # Log file name prefix.
 	server.tomcat.accesslog.rename-on-rotate=false # Whether to defer inclusion of the date stamp in the file name until rotate time.