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package com.heavenark.infrastructure.log.hook;

import com.heavenark.infrastructure.log.ArkLogThread;
import com.heavenark.infrastructure.log.component.ArkLogRecord;

/**
 * Ark-Log shutdown hook
 *
 * @author 冰糕Luminous BGLuminous Luminous
 * @since 3.0.0 2022-03-25
 */
public class ArkLogHookReg {
  /** register flag */
  private boolean registered = false;

  /** constructor */
  private ArkLogHookReg() {}

  /**
   * Get Ark-Log util instance
   *
   * @return util instance
   */
  public static ArkLogHookReg instance() {
    return ArkLogHookReg.Holder.INSTANCE;
  }

  /** register hook */
  public static void regShutdownHook() {
    if (instance().registered) {
      return;
    }
    Runtime.getRuntime().addShutdownHook(new ArkLogShutdownHook());
    instance().registered = true;
  }

  private static class ArkLogShutdownHook extends Thread {
    /**
     * If this thread was constructed using a separate Runnable run object, then that
     * Runnable object's run method is called; otherwise, this method does
     * nothing and returns.
     *
     * Subclasses of Thread should override this method.
     *
     * @see #start()
     */
    @Override
    public void run() {
      try {
        Thread.sleep(1000);
        ArkLogThread.shutdown();
        ArkLogRecord.shutdown();
      } catch (InterruptedException ex) {
        Thread.currentThread().interrupt();
      }
    }
  }

  /** Initialization on Demand Holder */
  private static class Holder {
    public static final ArkLogHookReg INSTANCE = new ArkLogHookReg();
  }
}