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.queue.services.recovery;
  
  import io.cloudslang.engine.queue.entities.ExecStatus;
  import io.cloudslang.engine.queue.entities.ExecutionMessage;
  import io.cloudslang.engine.queue.services.ExecutionQueueService;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.transaction.annotation.Propagation;
  import org.springframework.transaction.annotation.Transactional;
  import org.springframework.util.CollectionUtils;
  
  import java.util.List;
  
  /**
   * User: varelasa
   * Date: 22/07/14
   * Time: 13:24
   */
  final public class MessageRecoveryServiceImpl implements MessageRecoveryService {
  
      private final Logger logger = LogManager.getLogger(getClass());
  
      @Autowired
      private ExecutionQueueService executionQueueService;
  
      @Override
      @Transactional(propagation = Propagation.REQUIRES_NEW)
      public boolean recoverMessagesBulk(String workerName, int defaultPoolSize) {
  
          List<ExecutionMessage> messages = executionQueueService.pollRecovery(workerName, defaultPoolSize,
                  ExecStatus.ASSIGNED,
                  ExecStatus.SENT,
                  ExecStatus.IN_PROGRESS);
  
          logMessageRecovery(messages);
          enqueueMessages(messages,ExecStatus.RECOVERED);
          //noinspection RedundantIfStatement
          if (messages == null || messages.size() < defaultPoolSize){
             return false;
          }
          return true;
      }
  
      @Override
      @Transactional(propagation = Propagation.SUPPORTS)
      public void logMessageRecovery(List<ExecutionMessage> messages) {
          if(!CollectionUtils.isEmpty(messages)){
              logger.warn("Will do recovery for " + messages.size() + " messages. ");
              if(logger.isDebugEnabled()){
                  for(ExecutionMessage msg:messages){
                      logger.debug("Will do recovery for messages with ExecStateId = " + msg.getExecStateId());
                  }
              }
          }
      }
  
      @Override
      @Transactional
      public void enqueueMessages(List<ExecutionMessage> messages, ExecStatus messageStatus) {
          if(!CollectionUtils.isEmpty(messages)){
              for(ExecutionMessage msg:messages){
                  msg.setStatus(messageStatus);
                  msg.setWorkerId(ExecutionMessage.EMPTY_WORKER);
                  msg.incMsgSeqId();
              }
              executionQueueService.enqueue(messages);
          }
      }
  }
  