spring StartupInfoLogger 源码

springboot StartupInfoLogger 代码

文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/StartupInfoLogger.java

/*
 * Copyright 2012-2022 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
 *
 *      https://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;

import java.lang.management.ManagementFactory;
import java.net.InetAddress;
import java.time.Duration;
import java.util.concurrent.Callable;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.boot.system.ApplicationHome;
import org.springframework.boot.system.ApplicationPid;
import org.springframework.context.ApplicationContext;
import org.springframework.core.log.LogMessage;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.util.StringUtils;

/**
 * Logs application information on startup.
 *
 * @author Phillip Webb
 * @author Dave Syer
 */
class StartupInfoLogger {

	private static final Log logger = LogFactory.getLog(StartupInfoLogger.class);

	private static final long HOST_NAME_RESOLVE_THRESHOLD = 200;

	private final Class<?> sourceClass;

	StartupInfoLogger(Class<?> sourceClass) {
		this.sourceClass = sourceClass;
	}

	void logStarting(Log applicationLog) {
		Assert.notNull(applicationLog, "Log must not be null");
		applicationLog.info(LogMessage.of(this::getStartingMessage));
		applicationLog.debug(LogMessage.of(this::getRunningMessage));
	}

	void logStarted(Log applicationLog, Duration timeTakenToStartup) {
		if (applicationLog.isInfoEnabled()) {
			applicationLog.info(getStartedMessage(timeTakenToStartup));
		}
	}

	private CharSequence getStartingMessage() {
		StringBuilder message = new StringBuilder();
		message.append("Starting ");
		appendApplicationName(message);
		appendVersion(message, this.sourceClass);
		appendJavaVersion(message);
		appendOn(message);
		appendPid(message);
		appendContext(message);
		return message;
	}

	private CharSequence getRunningMessage() {
		StringBuilder message = new StringBuilder();
		message.append("Running with Spring Boot");
		appendVersion(message, getClass());
		message.append(", Spring");
		appendVersion(message, ApplicationContext.class);
		return message;
	}

	private CharSequence getStartedMessage(Duration timeTakenToStartup) {
		StringBuilder message = new StringBuilder();
		message.append("Started ");
		appendApplicationName(message);
		message.append(" in ");
		message.append(timeTakenToStartup.toMillis() / 1000.0);
		message.append(" seconds");
		try {
			double uptime = ManagementFactory.getRuntimeMXBean().getUptime() / 1000.0;
			message.append(" (process running for ").append(uptime).append(")");
		}
		catch (Throwable ex) {
			// No JVM time available
		}
		return message;
	}

	private void appendApplicationName(StringBuilder message) {
		String name = (this.sourceClass != null) ? ClassUtils.getShortName(this.sourceClass) : "application";
		message.append(name);
	}

	private void appendVersion(StringBuilder message, Class<?> source) {
		append(message, "v", () -> source.getPackage().getImplementationVersion());
	}

	private void appendOn(StringBuilder message) {
		long startTime = System.currentTimeMillis();
		append(message, "on ", () -> InetAddress.getLocalHost().getHostName());
		long resolveTime = System.currentTimeMillis() - startTime;
		if (resolveTime > HOST_NAME_RESOLVE_THRESHOLD) {
			logger.warn(LogMessage.of(() -> {
				StringBuilder warning = new StringBuilder();
				warning.append("InetAddress.getLocalHost().getHostName() took ");
				warning.append(resolveTime);
				warning.append(" milliseconds to respond.");
				warning.append(" Please verify your network configuration");
				if (System.getProperty("os.name").toLowerCase().contains("mac")) {
					warning.append(" (macOS machines may need to add entries to /etc/hosts)");
				}
				warning.append(".");
				return warning;
			}));
		}
	}

	private void appendPid(StringBuilder message) {
		append(message, "with PID ", ApplicationPid::new);
	}

	private void appendContext(StringBuilder message) {
		StringBuilder context = new StringBuilder();
		ApplicationHome home = new ApplicationHome(this.sourceClass);
		if (home.getSource() != null) {
			context.append(home.getSource().getAbsolutePath());
		}
		append(context, "started by ", () -> System.getProperty("user.name"));
		append(context, "in ", () -> System.getProperty("user.dir"));
		if (context.length() > 0) {
			message.append(" (");
			message.append(context);
			message.append(")");
		}
	}

	private void appendJavaVersion(StringBuilder message) {
		append(message, "using Java ", () -> System.getProperty("java.version"));
	}

	private void append(StringBuilder message, String prefix, Callable<Object> call) {
		append(message, prefix, call, "");
	}

	private void append(StringBuilder message, String prefix, Callable<Object> call, String defaultValue) {
		Object result = callIfPossible(call);
		String value = (result != null) ? result.toString() : null;
		if (!StringUtils.hasLength(value)) {
			value = defaultValue;
		}
		if (StringUtils.hasLength(value)) {
			message.append((message.length() > 0) ? " " : "");
			message.append(prefix);
			message.append(value);
		}
	}

	private Object callIfPossible(Callable<Object> call) {
		try {
			return call.call();
		}
		catch (Exception ex) {
			return null;
		}
	}

}

相关信息

spring 源码目录

相关文章

spring AotProcessor 源码

spring ApplicationArguments 源码

spring ApplicationContextFactory 源码

spring ApplicationEnvironment 源码

spring ApplicationReactiveWebEnvironment 源码

spring ApplicationRunner 源码

spring ApplicationServletEnvironment 源码

spring Banner 源码

spring BeanDefinitionLoader 源码

spring BootstrapContext 源码