spring Log4J2LoggingSystem 源码
springboot Log4J2LoggingSystem 代码
文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/log4j2/Log4J2LoggingSystem.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.logging.log4j2;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.ConsoleHandler;
import java.util.logging.Handler;
import java.util.stream.Collectors;
import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Marker;
import org.apache.logging.log4j.core.Filter;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.Logger;
import org.apache.logging.log4j.core.LoggerContext;
import org.apache.logging.log4j.core.config.AbstractConfiguration;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.ConfigurationFactory;
import org.apache.logging.log4j.core.config.ConfigurationSource;
import org.apache.logging.log4j.core.config.LoggerConfig;
import org.apache.logging.log4j.core.config.composite.CompositeConfiguration;
import org.apache.logging.log4j.core.filter.AbstractFilter;
import org.apache.logging.log4j.core.util.NameUtil;
import org.apache.logging.log4j.jul.Log4jBridgeHandler;
import org.apache.logging.log4j.message.Message;
import org.springframework.boot.context.properties.bind.BindResult;
import org.springframework.boot.context.properties.bind.Bindable;
import org.springframework.boot.context.properties.bind.Binder;
import org.springframework.boot.logging.AbstractLoggingSystem;
import org.springframework.boot.logging.LogFile;
import org.springframework.boot.logging.LogLevel;
import org.springframework.boot.logging.LoggerConfiguration;
import org.springframework.boot.logging.LoggingInitializationContext;
import org.springframework.boot.logging.LoggingSystem;
import org.springframework.boot.logging.LoggingSystemFactory;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.util.CollectionUtils;
import org.springframework.util.ResourceUtils;
import org.springframework.util.StringUtils;
/**
* {@link LoggingSystem} for <a href="https://logging.apache.org/log4j/2.x/">Log4j 2</a>.
*
* @author Daniel Fullarton
* @author Andy Wilkinson
* @author Alexander Heusingfeld
* @author Ben Hale
* @since 1.2.0
*/
public class Log4J2LoggingSystem extends AbstractLoggingSystem {
private static final String FILE_PROTOCOL = "file";
private static final String LOG4J_BRIDGE_HANDLER = "org.apache.logging.log4j.jul.Log4jBridgeHandler";
private static final String LOG4J_LOG_MANAGER = "org.apache.logging.log4j.jul.LogManager";
private static final LogLevels<Level> LEVELS = new LogLevels<>();
static {
LEVELS.map(LogLevel.TRACE, Level.TRACE);
LEVELS.map(LogLevel.DEBUG, Level.DEBUG);
LEVELS.map(LogLevel.INFO, Level.INFO);
LEVELS.map(LogLevel.WARN, Level.WARN);
LEVELS.map(LogLevel.ERROR, Level.ERROR);
LEVELS.map(LogLevel.FATAL, Level.FATAL);
LEVELS.map(LogLevel.OFF, Level.OFF);
}
private static final Filter FILTER = new AbstractFilter() {
@Override
public Result filter(LogEvent event) {
return Result.DENY;
}
@Override
public Result filter(Logger logger, Level level, Marker marker, Message msg, Throwable t) {
return Result.DENY;
}
@Override
public Result filter(Logger logger, Level level, Marker marker, Object msg, Throwable t) {
return Result.DENY;
}
@Override
public Result filter(Logger logger, Level level, Marker marker, String msg, Object... params) {
return Result.DENY;
}
};
public Log4J2LoggingSystem(ClassLoader classLoader) {
super(classLoader);
}
@Override
protected String[] getStandardConfigLocations() {
return getCurrentlySupportedConfigLocations();
}
private String[] getCurrentlySupportedConfigLocations() {
List<String> supportedConfigLocations = new ArrayList<>();
addTestFiles(supportedConfigLocations);
supportedConfigLocations.add("log4j2.properties");
if (isClassAvailable("com.fasterxml.jackson.dataformat.yaml.YAMLParser")) {
Collections.addAll(supportedConfigLocations, "log4j2.yaml", "log4j2.yml");
}
if (isClassAvailable("com.fasterxml.jackson.databind.ObjectMapper")) {
Collections.addAll(supportedConfigLocations, "log4j2.json", "log4j2.jsn");
}
supportedConfigLocations.add("log4j2.xml");
return StringUtils.toStringArray(supportedConfigLocations);
}
private void addTestFiles(List<String> supportedConfigLocations) {
supportedConfigLocations.add("log4j2-test.properties");
if (isClassAvailable("com.fasterxml.jackson.dataformat.yaml.YAMLParser")) {
Collections.addAll(supportedConfigLocations, "log4j2-test.yaml", "log4j2-test.yml");
}
if (isClassAvailable("com.fasterxml.jackson.databind.ObjectMapper")) {
Collections.addAll(supportedConfigLocations, "log4j2-test.json", "log4j2-test.jsn");
}
supportedConfigLocations.add("log4j2-test.xml");
}
protected boolean isClassAvailable(String className) {
return ClassUtils.isPresent(className, getClassLoader());
}
@Override
public void beforeInitialize() {
LoggerContext loggerContext = getLoggerContext();
if (isAlreadyInitialized(loggerContext)) {
return;
}
if (!configureJdkLoggingBridgeHandler()) {
super.beforeInitialize();
}
loggerContext.getConfiguration().addFilter(FILTER);
}
private boolean configureJdkLoggingBridgeHandler() {
try {
if (isJulUsingASingleConsoleHandlerAtMost() && !isLog4jLogManagerInstalled()
&& isLog4jBridgeHandlerAvailable()) {
removeDefaultRootHandler();
Log4jBridgeHandler.install(false, null, true);
return true;
}
}
catch (Throwable ex) {
// Ignore. No java.util.logging bridge is installed.
}
return false;
}
private boolean isJulUsingASingleConsoleHandlerAtMost() {
java.util.logging.Logger rootLogger = java.util.logging.LogManager.getLogManager().getLogger("");
Handler[] handlers = rootLogger.getHandlers();
return handlers.length == 0 || (handlers.length == 1 && handlers[0] instanceof ConsoleHandler);
}
private boolean isLog4jLogManagerInstalled() {
final String logManagerClassName = java.util.logging.LogManager.getLogManager().getClass().getName();
return LOG4J_LOG_MANAGER.equals(logManagerClassName);
}
private boolean isLog4jBridgeHandlerAvailable() {
return ClassUtils.isPresent(LOG4J_BRIDGE_HANDLER, getClassLoader());
}
private void removeLog4jBridgeHandler() {
removeDefaultRootHandler();
java.util.logging.Logger rootLogger = java.util.logging.LogManager.getLogManager().getLogger("");
for (final Handler handler : rootLogger.getHandlers()) {
if (handler instanceof Log4jBridgeHandler) {
handler.close();
rootLogger.removeHandler(handler);
}
}
}
private void removeDefaultRootHandler() {
try {
java.util.logging.Logger rootLogger = java.util.logging.LogManager.getLogManager().getLogger("");
Handler[] handlers = rootLogger.getHandlers();
if (handlers.length == 1 && handlers[0] instanceof ConsoleHandler) {
rootLogger.removeHandler(handlers[0]);
}
}
catch (Throwable ex) {
// Ignore and continue
}
}
@Override
public void initialize(LoggingInitializationContext initializationContext, String configLocation, LogFile logFile) {
LoggerContext loggerContext = getLoggerContext();
if (isAlreadyInitialized(loggerContext)) {
return;
}
loggerContext.getConfiguration().removeFilter(FILTER);
super.initialize(initializationContext, configLocation, logFile);
markAsInitialized(loggerContext);
}
@Override
protected void loadDefaults(LoggingInitializationContext initializationContext, LogFile logFile) {
if (logFile != null) {
loadConfiguration(getPackagedConfigFile("log4j2-file.xml"), logFile, getOverrides(initializationContext));
}
else {
loadConfiguration(getPackagedConfigFile("log4j2.xml"), logFile, getOverrides(initializationContext));
}
}
private List<String> getOverrides(LoggingInitializationContext initializationContext) {
BindResult<List<String>> overrides = Binder.get(initializationContext.getEnvironment())
.bind("logging.log4j2.config.override", Bindable.listOf(String.class));
return overrides.orElse(Collections.emptyList());
}
@Override
protected void loadConfiguration(LoggingInitializationContext initializationContext, String location,
LogFile logFile) {
if (initializationContext != null) {
applySystemProperties(initializationContext.getEnvironment(), logFile);
}
loadConfiguration(location, logFile, getOverrides(initializationContext));
}
/**
* Load the configuration from the given {@code location}, creating a composite using
* the configuration from the given {@code overrides}.
* @param location the location
* @param logFile log file configuration
* @param overrides the overriding locations
* @since 2.6.0
*/
protected void loadConfiguration(String location, LogFile logFile, List<String> overrides) {
Assert.notNull(location, "Location must not be null");
try {
List<Configuration> configurations = new ArrayList<>();
LoggerContext context = getLoggerContext();
configurations.add(load(location, context));
for (String override : overrides) {
configurations.add(load(override, context));
}
Configuration configuration = (configurations.size() > 1) ? createComposite(configurations)
: configurations.iterator().next();
context.start(configuration);
}
catch (Exception ex) {
throw new IllegalStateException("Could not initialize Log4J2 logging from " + location, ex);
}
}
private Configuration load(String location, LoggerContext context) throws IOException {
URL url = ResourceUtils.getURL(location);
ConfigurationSource source = getConfigurationSource(url);
return ConfigurationFactory.getInstance().getConfiguration(context, source);
}
private ConfigurationSource getConfigurationSource(URL url) throws IOException {
InputStream stream = url.openStream();
if (FILE_PROTOCOL.equals(url.getProtocol())) {
return new ConfigurationSource(stream, ResourceUtils.getFile(url));
}
return new ConfigurationSource(stream, url);
}
private CompositeConfiguration createComposite(List<Configuration> configurations) {
return new CompositeConfiguration(
configurations.stream().map(AbstractConfiguration.class::cast).collect(Collectors.toList()));
}
@Override
protected void reinitialize(LoggingInitializationContext initializationContext) {
List<String> overrides = getOverrides(initializationContext);
if (!CollectionUtils.isEmpty(overrides)) {
reinitializeWithOverrides(overrides);
}
else {
LoggerContext context = getLoggerContext();
context.reconfigure();
}
}
private void reinitializeWithOverrides(List<String> overrides) {
LoggerContext context = getLoggerContext();
Configuration base = context.getConfiguration();
List<AbstractConfiguration> configurations = new ArrayList<>();
configurations.add((AbstractConfiguration) base);
for (String override : overrides) {
try {
configurations.add((AbstractConfiguration) load(override, context));
}
catch (IOException ex) {
throw new RuntimeException("Failed to load overriding configuration from '" + override + "'", ex);
}
}
CompositeConfiguration composite = new CompositeConfiguration(configurations);
context.reconfigure(composite);
}
@Override
public Set<LogLevel> getSupportedLogLevels() {
return LEVELS.getSupported();
}
@Override
public void setLogLevel(String loggerName, LogLevel logLevel) {
setLogLevel(loggerName, LEVELS.convertSystemToNative(logLevel));
}
private void setLogLevel(String loggerName, Level level) {
LoggerConfig logger = getLogger(loggerName);
if (level == null) {
clearLogLevel(loggerName, logger);
}
else {
setLogLevel(loggerName, logger, level);
}
getLoggerContext().updateLoggers();
}
private void clearLogLevel(String loggerName, LoggerConfig logger) {
if (logger instanceof LevelSetLoggerConfig) {
getLoggerContext().getConfiguration().removeLogger(loggerName);
}
else {
logger.setLevel(null);
}
}
private void setLogLevel(String loggerName, LoggerConfig logger, Level level) {
if (logger == null) {
getLoggerContext().getConfiguration().addLogger(loggerName,
new LevelSetLoggerConfig(loggerName, level, true));
}
else {
logger.setLevel(level);
}
}
@Override
public List<LoggerConfiguration> getLoggerConfigurations() {
List<LoggerConfiguration> result = new ArrayList<>();
getAllLoggers().forEach((name, loggerConfig) -> result.add(convertLoggerConfig(name, loggerConfig)));
result.sort(CONFIGURATION_COMPARATOR);
return result;
}
@Override
public LoggerConfiguration getLoggerConfiguration(String loggerName) {
LoggerConfig loggerConfig = getAllLoggers().get(loggerName);
return (loggerConfig != null) ? convertLoggerConfig(loggerName, loggerConfig) : null;
}
private Map<String, LoggerConfig> getAllLoggers() {
Map<String, LoggerConfig> loggers = new LinkedHashMap<>();
for (Logger logger : getLoggerContext().getLoggers()) {
addLogger(loggers, logger.getName());
}
getLoggerContext().getConfiguration().getLoggers().keySet().forEach((name) -> addLogger(loggers, name));
return loggers;
}
private void addLogger(Map<String, LoggerConfig> loggers, String name) {
Configuration configuration = getLoggerContext().getConfiguration();
while (name != null) {
loggers.computeIfAbsent(name, configuration::getLoggerConfig);
name = getSubName(name);
}
}
private String getSubName(String name) {
if (!StringUtils.hasLength(name)) {
return null;
}
int nested = name.lastIndexOf('$');
return (nested != -1) ? name.substring(0, nested) : NameUtil.getSubName(name);
}
private LoggerConfiguration convertLoggerConfig(String name, LoggerConfig loggerConfig) {
if (loggerConfig == null) {
return null;
}
LogLevel level = LEVELS.convertNativeToSystem(loggerConfig.getLevel());
if (!StringUtils.hasLength(name) || LogManager.ROOT_LOGGER_NAME.equals(name)) {
name = ROOT_LOGGER_NAME;
}
boolean isLoggerConfigured = loggerConfig.getName().equals(name);
LogLevel configuredLevel = (isLoggerConfigured) ? level : null;
return new LoggerConfiguration(name, configuredLevel, level);
}
@Override
public Runnable getShutdownHandler() {
return () -> getLoggerContext().stop();
}
@Override
public void cleanUp() {
if (isLog4jBridgeHandlerAvailable()) {
removeLog4jBridgeHandler();
}
super.cleanUp();
LoggerContext loggerContext = getLoggerContext();
markAsUninitialized(loggerContext);
loggerContext.getConfiguration().removeFilter(FILTER);
}
private LoggerConfig getLogger(String name) {
boolean isRootLogger = !StringUtils.hasLength(name) || ROOT_LOGGER_NAME.equals(name);
return findLogger(isRootLogger ? LogManager.ROOT_LOGGER_NAME : name);
}
private LoggerConfig findLogger(String name) {
Configuration configuration = getLoggerContext().getConfiguration();
if (configuration instanceof AbstractConfiguration abstractConfiguration) {
return abstractConfiguration.getLogger(name);
}
return configuration.getLoggers().get(name);
}
private LoggerContext getLoggerContext() {
return (LoggerContext) LogManager.getContext(false);
}
private boolean isAlreadyInitialized(LoggerContext loggerContext) {
return LoggingSystem.class.getName().equals(loggerContext.getExternalContext());
}
private void markAsInitialized(LoggerContext loggerContext) {
loggerContext.setExternalContext(LoggingSystem.class.getName());
}
private void markAsUninitialized(LoggerContext loggerContext) {
loggerContext.setExternalContext(null);
}
/**
* {@link LoggingSystemFactory} that returns {@link Log4J2LoggingSystem} if possible.
*/
@Order(Ordered.LOWEST_PRECEDENCE)
public static class Factory implements LoggingSystemFactory {
private static final boolean PRESENT = ClassUtils
.isPresent("org.apache.logging.log4j.core.impl.Log4jContextFactory", Factory.class.getClassLoader());
@Override
public LoggingSystem getLoggingSystem(ClassLoader classLoader) {
if (PRESENT) {
return new Log4J2LoggingSystem(classLoader);
}
return null;
}
}
/**
* {@link LoggerConfig} used when the user has set a specific {@link Level}.
*/
private static class LevelSetLoggerConfig extends LoggerConfig {
LevelSetLoggerConfig(String name, Level level, boolean additive) {
super(name, level, additive);
}
}
}
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