special-case/src/main/java/com/iluwatar/specialcase/MaintenanceLock.java - master - githubmirror/java-design-patterns

special-case/src/main/java/com/iluwatar/specialcase/MaintenanceLock.java

56 строк2 KB

Ilkka Seppälä

deps: Refactor dependencies (#3224)

29 мар 2025, 20:34

29 мар 2025, 20:340ca162a

/*
 * This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
 *
 * The MIT License
 * Copyright © 2014-2022 Ilkka Seppälä
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.iluwatar.specialcase;

import lombok.Getter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/** Acquire lock on the DB for maintenance. */
public class MaintenanceLock {

  private static final Logger LOGGER = LoggerFactory.getLogger(MaintenanceLock.class);

  private static MaintenanceLock instance;

  @Getter private boolean lock = true;

  /**
   * Get the instance of MaintenanceLock.
   *
   * @return singleton instance of MaintenanceLock
   */
  public static synchronized MaintenanceLock getInstance() {
    if (instance == null) {
      instance = new MaintenanceLock();
    }
    return instance;
  }

  public void setLock(boolean lock) {
    this.lock = lock;
    LOGGER.info("Maintenance lock is set to: {}", lock);
  }
}