Optimize logger calls

Guard logger calls to ensure that they are only made when the
level is set.

See gh-18710

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/jdbc/DataSourcePoolMetricsAutoConfiguration.java

@@ -124,7 +124,9 @@ public class DataSourcePoolMetricsAutoConfiguration {
 					hikari.setMetricsTrackerFactory(new MicrometerMetricsTrackerFactory(this.registry));
 				}
 				catch (Exception ex) {
-					logger.warn("Failed to bind Hikari metrics: " + ex.getMessage());
+					if (logger.isWarnEnabled()) {
+						logger.warn("Failed to bind Hikari metrics: " + ex.getMessage());
+					}
 				}
 			}
 		}

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/system/DiskSpaceHealthIndicator.java

@@ -62,8 +62,10 @@ public class DiskSpaceHealthIndicator extends AbstractHealthIndicator {
 			builder.up();
 		}
 		else {
-			logger.warn(String.format("Free disk space below threshold. Available: %d bytes (threshold: %s)",
-					diskFreeInBytes, this.threshold));
+			if (logger.isWarnEnabled()) {
+				logger.warn(String.format("Free disk space below threshold. Available: %d bytes (threshold: %s)",
+						diskFreeInBytes, this.threshold));
+			}
 			builder.down();
 		}
 		builder.withDetail("total", this.path.getTotalSpace()).withDetail("free", diskFreeInBytes)

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/neo4j/Neo4jDataAutoConfiguration.java

@@ -111,7 +111,7 @@ public class Neo4jDataAutoConfiguration {
 
 		@Bean
 		OpenSessionInViewInterceptor neo4jOpenSessionInViewInterceptor(Neo4jProperties properties) {
-			if (properties.getOpenInView() == null) {
+			if (properties.getOpenInView() == null && logger.isWarnEnabled()) {
 				logger.warn("spring.data.neo4j.open-in-view is enabled by default."
 						+ "Therefore, database queries may be performed during view "
 						+ "rendering. Explicitly configure "

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/groovy/template/GroovyTemplateAutoConfiguration.java

@@ -83,7 +83,7 @@ public class GroovyTemplateAutoConfiguration {
 		public void checkTemplateLocationExists() {
 			if (this.properties.isCheckTemplateLocation() && !isUsingGroovyAllJar()) {
 				TemplateLocation location = new TemplateLocation(this.properties.getResourceLoaderPath());
-				if (!location.exists(this.applicationContext)) {
+				if (!location.exists(this.applicationContext) && logger.isWarnEnabled()) {
 					logger.warn("Cannot find template location: " + location
 							+ " (please add some templates, check your Groovy "
 							+ "configuration, or set spring.groovy.template.check-template-location=false)");

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration.java

@@ -119,8 +119,10 @@ public class JacksonAutoConfiguration {
 
 		@Bean
 		SimpleModule jodaDateTimeSerializationModule(JacksonProperties jacksonProperties) {
-			logger.warn("Auto-configuration of Jackson's Joda-Time integration is deprecated in favor of using "
-					+ "java.time (JSR-310).");
+			if (logger.isWarnEnabled()) {
+				logger.warn("Auto-configuration of Jackson's Joda-Time integration is deprecated in favor of using "
+						+ "java.time (JSR-310).");
+			}
 			SimpleModule module = new SimpleModule();
 			JacksonJodaDateFormat jacksonJodaFormat = getJacksonJodaDateFormat(jacksonProperties);
 			if (jacksonJodaFormat != null) {

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/DataSourceInitializerInvoker.java

@@ -76,7 +76,9 @@ class DataSourceInitializerInvoker implements ApplicationListener<DataSourceSche
 			}
 		}
 		catch (IllegalStateException ex) {
-			logger.warn("Could not send event to complete DataSource initialization (" + ex.getMessage() + ")");
+			if (logger.isWarnEnabled()) {
+				logger.warn("Could not send event to complete DataSource initialization (" + ex.getMessage() + ")");
+			}
 		}
 	}
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mustache/MustacheAutoConfiguration.java

@@ -63,7 +63,7 @@ public class MustacheAutoConfiguration {
 	public void checkTemplateLocationExists() {
 		if (this.mustache.isCheckTemplateLocation()) {
 			TemplateLocation location = new TemplateLocation(this.mustache.getPrefix());
-			if (!location.exists(this.applicationContext)) {
+			if (!location.exists(this.applicationContext) && logger.isWarnEnabled()) {
 				logger.warn("Cannot find template location: " + location
 						+ " (please add some templates, check your Mustache configuration, or set spring.mustache."
 						+ "check-template-location=false)");

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/orm/jpa/JpaBaseConfiguration.java

@@ -216,7 +216,7 @@ public abstract class JpaBaseConfiguration implements BeanFactoryAware {
 
 		@Bean
 		public OpenEntityManagerInViewInterceptor openEntityManagerInViewInterceptor() {
-			if (this.jpaProperties.getOpenInView() == null) {
+			if (this.jpaProperties.getOpenInView() == null && logger.isWarnEnabled()) {
 				logger.warn("spring.jpa.open-in-view is enabled by default. "
 						+ "Therefore, database queries may be performed during view "
 						+ "rendering. Explicitly configure spring.jpa.open-in-view to disable this warning");

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/reactive/error/AbstractErrorWebExceptionHandler.java

@@ -287,7 +287,7 @@ public abstract class AbstractErrorWebExceptionHandler implements ErrorWebExcept
 			logger.debug(request.exchange().getLogPrefix() + formatError(throwable, request));
 		}
 		if (HttpStatus.resolve(response.rawStatusCode()) != null
-				&& response.statusCode().equals(HttpStatus.INTERNAL_SERVER_ERROR)) {
+				&& response.statusCode().equals(HttpStatus.INTERNAL_SERVER_ERROR) && logger.isErrorEnabled()) {
 			logger.error(request.exchange().getLogPrefix() + "500 Server Error for " + formatRequest(request),
 					throwable);
 		}

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/autoconfigure/OptionalLiveReloadServer.java

@@ -54,7 +54,9 @@ public class OptionalLiveReloadServer implements InitializingBean {
 				if (!this.server.isStarted()) {
 					this.server.start();
 				}
-				logger.info("LiveReload server is running on port " + this.server.getPort());
+				if (logger.isInfoEnabled()) {
+					logger.info("LiveReload server is running on port " + this.server.getPort());
+				}
 			}
 			catch (Exception ex) {
 				logger.warn("Unable to start LiveReload server");

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/autoconfigure/RemoteDevToolsAutoConfiguration.java

@@ -126,7 +126,9 @@ public class RemoteDevToolsAutoConfiguration {
 			RemoteDevToolsProperties remote = properties.getRemote();
 			String servletContextPath = (servlet.getContextPath() != null) ? servlet.getContextPath() : "";
 			String url = servletContextPath + remote.getContextPath() + "/restart";
-			logger.warn("Listening for remote restart updates on " + url);
+			if (logger.isWarnEnabled()) {
+				logger.warn("Listening for remote restart updates on " + url);
+			}
 			Handler handler = new HttpRestartServerHandler(server);
 			return new UrlHandlerMapper(url, handler);
 		}

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/classpath/ClassPathFolders.java

@@ -58,8 +58,12 @@ public class ClassPathFolders implements Iterable<File> {
 				this.folders.add(ResourceUtils.getFile(url));
 			}
 			catch (Exception ex) {
-				logger.warn("Unable to get classpath URL " + url);
-				logger.trace("Unable to get classpath URL " + url, ex);
+				if (logger.isWarnEnabled()) {
+					logger.warn("Unable to get classpath URL " + url);
+				}
+				if (logger.isTraceEnabled()) {
+					logger.trace("Unable to get classpath URL " + url, ex);
+				}
 			}
 		}
 	}

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/env/DevToolsPropertyDefaultsPostProcessor.java

@@ -80,10 +80,12 @@ public class DevToolsPropertyDefaultsPostProcessor implements EnvironmentPostPro
 	public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
 		if (DevToolsEnablementDeducer.shouldEnable(Thread.currentThread()) && isLocalApplication(environment)) {
 			if (canAddProperties(environment)) {
-				logger.info("Devtools property defaults active! Set '" + ENABLED + "' to 'false' to disable");
+				if (logger.isInfoEnabled()) {
+					logger.info("Devtools property defaults active! Set '" + ENABLED + "' to 'false' to disable");
+				}
 				environment.getPropertySources().addLast(new MapPropertySource("devtools", PROPERTIES));
 			}
-			if (isWebApplication(environment) && !environment.containsProperty(WEB_LOGGING)) {
+			if (isWebApplication(environment) && !environment.containsProperty(WEB_LOGGING) && logger.isInfoEnabled()) {
 				logger.info("For additional web related logging consider setting the '" + WEB_LOGGING
 						+ "' property to 'DEBUG'");
 			}

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/remote/client/ClassPathChangeUploader.java

@@ -114,8 +114,10 @@ public class ClassPathChangeUploader implements ApplicationListener<ClassPathCha
 					return;
 				}
 				catch (SocketException ex) {
-					logger.warn("A failure occurred when uploading to " + this.uri
-							+ ". Upload will be retried in 2 seconds");
+					if (logger.isWarnEnabled()) {
+						logger.warn("A failure occurred when uploading to " + this.uri
+								+ ". Upload will be retried in 2 seconds");
+					}
 					logger.debug("Upload failure", ex);
 					Thread.sleep(2000);
 				}
@@ -128,8 +130,10 @@ public class ClassPathChangeUploader implements ApplicationListener<ClassPathCha
 	}
 
 	private void logUpload(ClassLoaderFiles classLoaderFiles) {
-		int size = classLoaderFiles.size();
-		logger.info("Uploaded " + size + " class " + ((size != 1) ? "resources" : "resource"));
+		if (logger.isInfoEnabled()) {
+			int size = classLoaderFiles.size();
+			logger.info("Uploaded " + size + " class " + ((size != 1) ? "resources" : "resource"));
+		}
 	}
 
 	private byte[] serialize(ClassLoaderFiles classLoaderFiles) throws IOException {

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/remote/client/RemoteClientConfiguration.java

@@ -118,7 +118,7 @@ public class RemoteClientConfiguration implements InitializingBean {
 		if (!remoteProperties.getRestart().isEnabled()) {
 			logger.warn("Remote restart is disabled.");
 		}
-		if (!this.remoteUrl.startsWith("https://")) {
+		if (!this.remoteUrl.startsWith("https://") && logger.isWarnEnabled()) {
 			logger.warn("The connection to " + this.remoteUrl
 					+ " is insecure. You should use a URL starting with 'https://'.");
 		}

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/ChangeableUrls.java

@@ -170,7 +170,7 @@ final class ChangeableUrls implements Iterable<URL> {
 				throw new IllegalStateException("Class-Path attribute contains malformed URL", ex);
 			}
 		}
-		if (!nonExistentEntries.isEmpty()) {
+		if (!nonExistentEntries.isEmpty() && logger.isInfoEnabled()) {
 			logger.info("The Class-Path manifest attribute in " + jarFile.getName()
 					+ " referenced one or more files that do not exist: "
 					+ StringUtils.collectionToCommaDelimitedString(nonExistentEntries));

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/RestartApplicationListener.java

@@ -73,7 +73,9 @@ public class RestartApplicationListener implements ApplicationListener<Applicati
 			Restarter.initialize(args, false, initializer, restartOnInitialize);
 		}
 		else {
-			logger.info("Restart disabled due to System property '" + ENABLED_PROPERTY + "' being set to false");
+			if (logger.isInfoEnabled()) {
+				logger.info("Restart disabled due to System property '" + ENABLED_PROPERTY + "' being set to false");
+			}
 			Restarter.disable();
 		}
 	}

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/tunnel/client/HttpTunnelConnection.java

@@ -92,7 +92,9 @@ public class HttpTunnelConnection implements TunnelConnection {
 
 	@Override
 	public TunnelChannel open(WritableByteChannel incomingChannel, Closeable closeable) throws Exception {
-		logger.trace("Opening HTTP tunnel to " + this.uri);
+		if (logger.isTraceEnabled()) {
+			logger.trace("Opening HTTP tunnel to " + this.uri);
+		}
 		return new TunnelChannel(incomingChannel, closeable);
 	}
 
@@ -152,7 +154,10 @@ public class HttpTunnelConnection implements TunnelConnection {
 					}
 					catch (IOException ex) {
 						if (ex instanceof ConnectException) {
-							logger.warn("Failed to connect to remote application at " + HttpTunnelConnection.this.uri);
+							if (logger.isWarnEnabled()) {
+								logger.warn(
+										"Failed to connect to remote application at " + HttpTunnelConnection.this.uri);
+							}
 						}
 						else {
 							logger.trace("Unexpected connection error", ex);

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/tunnel/client/TunnelClient.java

@@ -88,7 +88,9 @@ public class TunnelClient implements SmartInitializingSingleton {
 			ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
 			serverSocketChannel.socket().bind(new InetSocketAddress(this.listenPort));
 			int port = serverSocketChannel.socket().getLocalPort();
-			logger.trace("Listening for TCP traffic to tunnel on port " + port);
+			if (logger.isTraceEnabled()) {
+				logger.trace("Listening for TCP traffic to tunnel on port " + port);
+			}
 			this.serverThread = new ServerThread(serverSocketChannel);
 			this.serverThread.start();
 			return port;
@@ -144,7 +146,9 @@ public class TunnelClient implements SmartInitializingSingleton {
 		}
 
 		public void close() throws IOException {
-			logger.trace("Closing tunnel client on port " + this.serverSocketChannel.socket().getLocalPort());
+			if (logger.isTraceEnabled()) {
+				logger.trace("Closing tunnel client on port " + this.serverSocketChannel.socket().getLocalPort());
+			}
 			this.serverSocketChannel.close();
 			this.acceptConnections = false;
 			interrupt();

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/tunnel/server/SocketTargetServerConnection.java

@@ -54,7 +54,9 @@ public class SocketTargetServerConnection implements TargetServerConnection {
 	@Override
 	public ByteChannel open(int socketTimeout) throws IOException {
 		SocketAddress address = new InetSocketAddress(this.portProvider.getPort());
-		logger.trace("Opening tunnel connection to target server on " + address);
+		if (logger.isTraceEnabled()) {
+			logger.trace("Opening tunnel connection to target server on " + address);
+		}
 		SocketChannel channel = SocketChannel.open(address);
 		channel.socket().setSoTimeout(socketTimeout);
 		return new TimeoutAwareChannel(channel);

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/ImageBanner.java

@@ -78,8 +78,10 @@ public class ImageBanner implements Banner {
 			printBanner(environment, out);
 		}
 		catch (Throwable ex) {
-			logger.warn("Image banner not printable: " + this.image + " (" + ex.getClass() + ": '" + ex.getMessage()
-					+ "')");
+			if (logger.isWarnEnabled()) {
+				logger.warn("Image banner not printable: " + this.image + " (" + ex.getClass() + ": '" + ex.getMessage()
+						+ "')");
+			}
 			logger.debug("Image banner printing failure", ex);
 		}
 		finally {

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/ResourceBanner.java

@@ -70,9 +70,10 @@ public class ResourceBanner implements Banner {
 			out.println(banner);
 		}
 		catch (Exception ex) {
-			logger.warn(
-					"Banner not printable: " + this.resource + " (" + ex.getClass() + ": '" + ex.getMessage() + "')",
-					ex);
+			if (logger.isWarnEnabled()) {
+				logger.warn("Banner not printable: " + this.resource + " (" + ex.getClass() + ": '" + ex.getMessage()
+						+ "')", ex);
+			}
 		}
 	}
 

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/StartupInfoLogger.java

@@ -121,7 +121,9 @@ class StartupInfoLogger {
 			if (System.getProperty("os.name").toLowerCase().contains("mac")) {
 				warning.append(" (macOS machines may need to add entries to /etc/hosts)");
 			}
-			logger.warn(warning.append("."));
+			if (logger.isWarnEnabled()) {
+				logger.warn(warning.append("."));
+			}
 		}
 	}
 

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/FileEncodingApplicationListener.java

@@ -64,12 +64,14 @@ public class FileEncodingApplicationListener
 		String encoding = System.getProperty("file.encoding");
 		String desired = environment.getProperty("spring.mandatory-file-encoding");
 		if (encoding != null && !desired.equalsIgnoreCase(encoding)) {
-			logger.error("System property 'file.encoding' is currently '" + encoding + "'. It should be '" + desired
-					+ "' (as defined in 'spring.mandatoryFileEncoding').");
-			logger.error("Environment variable LANG is '" + System.getenv("LANG")
-					+ "'. You could use a locale setting that matches encoding='" + desired + "'.");
-			logger.error("Environment variable LC_ALL is '" + System.getenv("LC_ALL")
-					+ "'. You could use a locale setting that matches encoding='" + desired + "'.");
+			if (logger.isErrorEnabled()) {
+				logger.error("System property 'file.encoding' is currently '" + encoding + "'. It should be '" + desired
+						+ "' (as defined in 'spring.mandatoryFileEncoding').");
+				logger.error("Environment variable LANG is '" + System.getenv("LANG")
+						+ "'. You could use a locale setting that matches encoding='" + desired + "'.");
+				logger.error("Environment variable LC_ALL is '" + System.getenv("LC_ALL")
+						+ "'. You could use a locale setting that matches encoding='" + desired + "'.");
+			}
 			throw new IllegalStateException("The Java Virtual Machine has not been configured to use the "
 					+ "desired default character encoding (" + desired + ").");
 		}

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

@@ -416,7 +416,9 @@ public class LoggingApplicationListener implements GenericApplicationListener {
 				system.setLogLevel(name, level);
 			}
 			catch (RuntimeException ex) {
-				this.logger.error("Cannot set level '" + level + "' for '" + name + "'");
+				if (this.logger.isErrorEnabled()) {
+					this.logger.error("Cannot set level '" + level + "' for '" + name + "'");
+				}
 			}
 		};
 	}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/diagnostics/FailureAnalyzers.java

@@ -77,7 +77,9 @@ final class FailureAnalyzers implements SpringBootExceptionReporter {
 				analyzers.add((FailureAnalyzer) constructor.newInstance());
 			}
 			catch (Throwable ex) {
-				logger.trace("Failed to load " + analyzerName, ex);
+				if (logger.isTraceEnabled()) {
+					logger.trace("Failed to load " + analyzerName, ex);
+				}
 			}
 		}
 		AnnotationAwareOrderComparator.sort(analyzers);

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/context/WebServerPortFileWriter.java

@@ -91,7 +91,9 @@ public class WebServerPortFileWriter implements ApplicationListener<WebServerIni
 			portFile.deleteOnExit();
 		}
 		catch (Exception ex) {
-			logger.warn(String.format("Cannot create port file %s", this.file));
+			if (logger.isWarnEnabled()) {
+				logger.warn(String.format("Cannot create port file %s", this.file));
+			}
 		}
 	}