net.snowflake.client.log.JDK14Logger Maven / Gradle / Ivy

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/*
 * Copyright (c) 2012-2018 Snowflake Computing Inc. All rights reserved.
 */
package net.snowflake.client.log;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Logger;
import java.util.logging.Level;
import java.util.logging.Handler;

/**
 * Use java.util.logging to implements SFLogger.
 *
 * Log Level mapping from SFLogger to java.util.logging:
 * ERROR -- SEVERE
 * WARN  -- WARNING
 * INFO  -- INFO
 * DEBUG -- FINE
 * TRACE -- FINEST
 *
 * Created by hyu on 11/17/16.
 */
public class JDK14Logger implements SFLogger
{
  private Logger jdkLogger;

  private Set logMethods = new HashSet<>(Arrays.asList(
      "debug", "error", "info", "trace", "warn"));

  public JDK14Logger(String name)
  {
    this.jdkLogger = Logger.getLogger(name);
  }

  public boolean isDebugEnabled()
  {
    return this.jdkLogger.isLoggable(Level.FINE);
  }

  public boolean isErrorEnabled()
  {
    return this.jdkLogger.isLoggable(Level.SEVERE);
  }

  public boolean isInfoEnabled()
  {
    return this.jdkLogger.isLoggable(Level.INFO);
  }

  public boolean isTraceEnabled()
  {
    return this.jdkLogger.isLoggable(Level.FINEST);
  }

  public boolean isWarnEnabled()
  {
    return this.jdkLogger.isLoggable(Level.WARNING);
  }

  public void debug(String msg)
  {
    logInternal(Level.FINE, msg);
  }

  public void debug(String msg, Object... arguments)
  {
    logInternal(Level.FINE, msg, arguments);
  }

  public void debug(String msg, Throwable t)
  {
    logInternal(Level.FINE, msg, t);
  }

  public void error(String msg)
  {
    logInternal(Level.SEVERE, msg);
  }

  public void error(String msg, Object... arguments)
  {
    logInternal(Level.SEVERE, msg, arguments);
  }

  public void error(String msg, Throwable t)
  {
    logInternal(Level.SEVERE, msg, t);
  }

  public void info(String msg)
  {
    logInternal(Level.INFO, msg);
  }

  public void info(String msg, Object... arguments)
  {
    logInternal(Level.INFO, msg, arguments);
  }

  public void info(String msg, Throwable t)
  {
    logInternal(Level.INFO, msg, t);
  }

  public void trace(String msg)
  {
    logInternal(Level.FINEST, msg);
  }

  public void trace(String msg, Object... arguments)
  {
    logInternal(Level.FINEST, msg, arguments);
  }

  public void trace(String msg, Throwable t)
  {
    logInternal(Level.FINEST, msg, t);
  }

  public void warn(String msg)
  {
    logInternal(Level.WARNING, msg);
  }

  public void warn(String msg, Object... arguments)
  {
    logInternal(Level.WARNING, msg, arguments);
  }

  public void warn(String msg, Throwable t)
  {
    logInternal(Level.WARNING, msg, t);
  }

  private void logInternal(Level level, String msg)
  {
    if (jdkLogger.isLoggable(level))
    {
      String[] source = findSourceInStack();
      jdkLogger.logp(level, source[0], source[1], msg);
    }
  }

  private void logInternal(Level level, String msg, Object... arguments)
  {
    if (jdkLogger.isLoggable(level))
    {
      String[] source = findSourceInStack();
      jdkLogger.logp(level, source[0], source[1], refactorString(msg), arguments);
    }
  }

  private void logInternal(Level level, String msg, Throwable t)
  {
    if (jdkLogger.isLoggable(level))
    {
      String[] source = findSourceInStack();
      jdkLogger.logp(level, source[0], source[1], msg, t);
    }
  }

  public static void addHandler(Handler handler)
  {
    Logger snowflakeLogger = Logger.getLogger(SFFormatter.CLASS_NAME_PREFIX);
    snowflakeLogger.addHandler(handler);
  }

  public static void setLevel(Level level)
  {
    Logger snowflakeLogger = Logger.getLogger(SFFormatter.CLASS_NAME_PREFIX);
    snowflakeLogger.setLevel(level);
  }

  public static void disableDefaultHandler()
  {
    Logger snowflakeLogger = Logger.getLogger("net.snowflake");
    snowflakeLogger.setUseParentHandlers(false);
  }

  /**
   * Since we use SLF4J ways of formatting string we need to refactor message string
   * if we have arguments.
   * For example, in sl4j, this string can be formatted with 2 arguments
   *
   *   ex.1: Error happened in {} on {}
   *
   * And if two arguments are provided, error message can be formatted.
   *
   * However, in java.util.logging, to achieve formatted error message,
   * Same string should be converted to
   *
   *   ex.2: Error happened in {0} on {1}
   *
   * Which represented first arguments and second arguments will be replaced in the
   * corresponding places.
   *
   * This method will convert string in ex.1 to ex.2
   *
   */
  private String refactorString(String original)
  {
    StringBuilder sb = new StringBuilder();
    int argCount = 0;
    for (int i=0; i