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本文主要研究一下springboot的LoggersEndpoint
LoggersEndpoint
代码语言：javascript复制/**
* {@link Endpoint @Endpoint} to expose a collection of {@link LoggerConfiguration}s.
*
* @author Ben Hale
* @author Phillip Webb
* @author HaiTao Zhang
* @since 2.0.0
*/
@Endpoint(id = "loggers")
public class LoggersEndpoint {
private final LoggingSystem loggingSystem;
private final LoggerGroups loggerGroups;
/**
* Create a new {@link LoggersEndpoint} instance.
* @param loggingSystem the logging system to expose
* @param loggerGroups the logger group to expose
*/
public LoggersEndpoint(LoggingSystem loggingSystem, LoggerGroups loggerGroups) {
Assert.notNull(loggingSystem, "LoggingSystem must not be null");
Assert.notNull(loggerGroups, "LoggerGroups must not be null");
this.loggingSystem = loggingSystem;
this.loggerGroups = loggerGroups;
}
//......
} springboot的actuator定义了LoggersEndpoint，它构造器依赖loggingSystem及loggerGroups
loggers
代码语言：javascript复制 @ReadOperation
public Map<String, Object> loggers() {
Collection<LoggerConfiguration> configurations = this.loggingSystem.getLoggerConfigurations();
if (configurations == null) {
return Collections.emptyMap();
}
Map<String, Object> result = new LinkedHashMap<>();
result.put("levels", getLevels());
result.put("loggers", getLoggers(configurations));
result.put("groups", getGroups());
return result;
}
private NavigableSet<LogLevel> getLevels() {
Set<LogLevel> levels = this.loggingSystem.getSupportedLogLevels();
return new TreeSet<>(levels).descendingSet();
}
private Map<String, LoggerLevels> getLoggers(Collection<LoggerConfiguration> configurations) {
Map<String, LoggerLevels> loggers = new LinkedHashMap<>(configurations.size());
for (LoggerConfiguration configuration : configurations) {
loggers.put(configuration.getName(), new SingleLoggerLevels(configuration));
}
return loggers;
}
private Map<String, LoggerLevels> getGroups() {
Map<String, LoggerLevels> groups = new LinkedHashMap<>();
this.loggerGroups.forEach((group) -> groups.put(group.getName(),
new GroupLoggerLevels(group.getConfiguredLevel(), group.getMembers())));
return groups;
} LoggersEndpoint定义了loggers的read操作，返回levels、loggers、groups
loggerLevels
代码语言：javascript复制 @ReadOperation
public LoggerLevels loggerLevels(@Selector String name) {
Assert.notNull(name, "Name must not be null");
LoggerGroup group = this.loggerGroups.get(name);
if (group != null) {
return new GroupLoggerLevels(group.getConfiguredLevel(), group.getMembers());
}
LoggerConfiguration configuration = this.loggingSystem.getLoggerConfiguration(name);
return (configuration != null) ? new SingleLoggerLevels(configuration) : null;
}LoggersEndpoint定义了loggerLevels的read操作，它接受name，返回对应的GroupLoggerLevels或者SingleLoggerLevels
configureLogLevel
代码语言：javascript复制 @WriteOperation
public void configureLogLevel(@Selector String name, @Nullable LogLevel configuredLevel) {
Assert.notNull(name, "Name must not be empty");
LoggerGroup group = this.loggerGroups.get(name);
if (group != null && group.hasMembers()) {
group.configureLogLevel(configuredLevel, this.loggingSystem::setLogLevel);
return;
}
this.loggingSystem.setLogLevel(name, configuredLevel);
}LoggersEndpoint定义了configureLogLevel这个write操作，它可用于变更logger的级别
小结
springboot的actuator定义了LoggersEndpoint，它定义了loggers的read操作，返回levels、loggers、groups；定义了loggerLevels的read操作，它接受name，返回对应的GroupLoggerLevels或者SingleLoggerLevels；定义了configureLogLevel这个write操作，可用于变更logger的级别。
