108 lines
3.0 KiB
Java
108 lines
3.0 KiB
Java
package envoy.util;
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import java.io.*;
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import java.time.LocalDateTime;
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import java.time.format.DateTimeFormatter;
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import java.util.logging.*;
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import envoy.data.Config;
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/**
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* Configures the {@link java.util.logging} API to output the log into the console and a log file.
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*
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* @author Leon Hofmeister
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* @author Kai S. K. Engelbart
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* @since Envoy Common v0.1-beta
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*/
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public final class EnvoyLog {
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private static FileHandler fileHandler;
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private static StreamHandler consoleHandler;
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private static boolean initialized;
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private EnvoyLog() {}
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/**
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* Initializes logging.
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*
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* @param config the config providing the console and log file barriers
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* @since Envoy Common v0.1-beta
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*/
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public static void initialize(Config config) {
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if (initialized)
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throw new IllegalStateException("EnvoyLog is already initialized");
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// Remove default console handler
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LogManager.getLogManager().reset();
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// Configure log file
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final File logFile = new File(config.getHomeDirectory(),
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"log/" + DateTimeFormatter.ofPattern("yyyy-MM-dd--hh-mm").format(LocalDateTime.now())
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+ ".log");
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logFile.getParentFile().mkdirs();
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// Configure formatting
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// Sample log entry: [2020-06-13 16:50:26] [INFORMATION]
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// [envoy.client.ui.Startup] Closing connection...
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System.setProperty("java.util.logging.SimpleFormatter.format",
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"[%1$tF %1$tT] [%4$-7s] [%3$s] %5$s %6$s%n");
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final SimpleFormatter formatter = new SimpleFormatter();
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try {
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fileHandler = new FileHandler(logFile.getAbsolutePath());
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fileHandler.setLevel(config.getFileLevelBarrier());
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fileHandler.setFormatter(formatter);
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} catch (SecurityException | IOException e) {
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e.printStackTrace();
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}
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consoleHandler = new StreamHandler(System.out, formatter) {
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@Override
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public synchronized void publish(LogRecord record) {
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super.publish(record);
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flush();
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}
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};
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consoleHandler.setLevel(config.getConsoleLevelBarrier());
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consoleHandler.setFormatter(formatter);
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initialized = true;
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EnvoyLog.attach("envoy");
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}
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/**
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* Configures all loggers that are contained within the hierarchy of a specific path to use the
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* console and file handlers.
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*
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* @param path the path to the loggers to configure
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* @since Envoy Common v0.1-beta
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*/
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private static void attach(String path) {
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if (!initialized)
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throw new IllegalStateException("EnvoyLog is not initialized");
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// Get root logger
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final Logger logger = Logger.getLogger(path);
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// Add handlers
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if (fileHandler != null)
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logger.addHandler(fileHandler);
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logger.addHandler(consoleHandler);
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// Delegate logger level filtering to the handlers
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logger.setLevel(Level.ALL);
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}
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/**
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* Creates a logger for a specified class, which output will be displayed inside the console and
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* written to the log file.
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*
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* @param logClass the class in which the logger is used
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* @return the created logger
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* @since Envoy Common v0.1-beta
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*/
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public static Logger getLogger(Class<?> logClass) {
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return Logger.getLogger(logClass.getCanonicalName());
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}
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}
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