Logging.java

package org.myrobotlab.logging;

import java.io.PrintWriter;
import java.io.StringWriter;

import org.slf4j.Logger;

public abstract class Logging {

  public final static Logger log = LoggerFactory.getLogger(Logging.class);

  // performance timing
  public static long startTimeMilliseconds = 0;

  public static boolean performanceTiming = false;

  public final static String logError(final Throwable e) {
    String ret = stackToString(e);
    log.error(ret);
    return ret;
  }

  /**
   * 
   * @param tag
   */
  static public void logTime(String tag) {
    if (!performanceTiming) {
      return;
    }
    if ("start".equals(tag)) {
      startTimeMilliseconds = System.currentTimeMillis();
    }

    log.info(String.format("performance clock :%d ms %s", System.currentTimeMillis() - startTimeMilliseconds, tag));

  }

  static public Boolean logTimeEnable(Boolean b) {
    performanceTiming = b;
    return performanceTiming;
  }

  static public void logTimeStart() {
    logTime("start");
  }

  public final static String stackToString(final Throwable e) {
    StringWriter sw;
    try {
      sw = new StringWriter();
      PrintWriter pw = new PrintWriter(sw);
      e.printStackTrace(pw);
    } catch (Exception e2) {
      return "bad stackToString";
    }
    return "------\r\n" + sw.toString() + "------\r\n";
  }

  public abstract void addAppender(Object type);

  public abstract void addAppender(String type);

  public abstract void addAppender(String type, String filename);

  public abstract void configure(); // a basic configuration

  public abstract String getLevel();

  public abstract void removeAllAppenders();

  public abstract void removeAppender(Object console);

  public abstract void removeAppender(String name);

  public abstract void setLevel(String level);

  public abstract void setLevel(String clazz, String level);

  /**
   * 
   * @param timerName
   * @param tag
   */
  /*
   * static public void logTime(String timerName, String tag) { if (timerMap ==
   * null) { timerMap = new HashMap<String, Long>(); }
   * 
   * if (!timerMap.containsKey(timerName) || "start".equals(tag)) {
   * timerMap.put(timerName, System.currentTimeMillis()); }
   * 
   * StringBuffer sb = new StringBuffer(40).append("timer ").append(timerName).
   * append(" ").append(System.currentTimeMillis() -
   * timerMap.get(timerName)).append(" ms ") .append(tag);
   * 
   * log.info(sb.toString()); }
   */
}