code: /*
   * Copyright © 2014-2017 EntIT Software LLC, a Micro Focus company (L.P.)
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package io.cloudslang.engine.node.services;
  
  import io.cloudslang.engine.node.entities.WorkerLock;
  import io.cloudslang.engine.node.repositories.WorkerLockRepository;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.transaction.annotation.Transactional;
  
  /**
   * User: varelasa
   * Date: 20/07/14
   * Time: 11:27
   */
  //@Service
  public final class WorkerLockServiceImpl implements WorkerLockService {
  
      private final Logger logger = LogManager.getLogger(getClass());
  
      @Autowired
      private WorkerLockRepository workerLockRepository;
  
      @Override
      @Transactional
      public void create(String uuid) {
  
          WorkerLock workerLock = new WorkerLock();
          workerLock.setUuid(uuid);
          workerLockRepository.save(workerLock);
      }
  
      @Override
      @Transactional
      public void delete(String uuid) {
  
          workerLockRepository.deleteByUuid(uuid);
      }
  
      @Override
      @Transactional
      public void lock(String uuid) {
          if (workerLockRepository.lock(uuid) == 1){
              if (logger.isDebugEnabled()) logger.debug("Worker [" + uuid + "] is locked");
          }
          else {
              throw new IllegalStateException("Unknown worker uuid [" + uuid + "]");
          }
      }
  }
  