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package org.activiti.engine.impl.cmd;

import java.io.Serializable;

import org.activiti.engine.ActivitiException;
import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.ActivitiObjectNotFoundException;
import org.activiti.engine.delegate.event.ActivitiEventType;
import org.activiti.engine.delegate.event.impl.ActivitiEventBuilder;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.TimerJobEntity;
import org.activiti.engine.runtime.Job;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**

 */

public class DeleteTimerJobCmd implements Command, Serializable {

  private static final Logger log = LoggerFactory.getLogger(DeleteTimerJobCmd.class);
  private static final long serialVersionUID = 1L;

  protected String timerJobId;

  public DeleteTimerJobCmd(String timerJobId) {
    this.timerJobId = timerJobId;
  }

  public Object execute(CommandContext commandContext) {
    TimerJobEntity jobToDelete = getJobToDelete(commandContext);
    
    sendCancelEvent(jobToDelete);

    commandContext.getTimerJobEntityManager().delete(jobToDelete);
    return null;
  }

  protected void sendCancelEvent(TimerJobEntity jobToDelete) {
    if (Context.getProcessEngineConfiguration().getEventDispatcher().isEnabled()) {
      Context.getProcessEngineConfiguration().getEventDispatcher().dispatchEvent(ActivitiEventBuilder.createEntityEvent(ActivitiEventType.JOB_CANCELED, jobToDelete));
    }
  }

  protected TimerJobEntity getJobToDelete(CommandContext commandContext) {
    if (timerJobId == null) {
      throw new ActivitiIllegalArgumentException("jobId is null");
    }
    if (log.isDebugEnabled()) {
      log.debug("Deleting job {}", timerJobId);
    }

    TimerJobEntity job = commandContext.getTimerJobEntityManager().findById(timerJobId);
    if (job == null) {
      throw new ActivitiObjectNotFoundException("No timer job found with id '" + timerJobId + "'", Job.class);
    }

    // We need to check if the job was locked, ie acquired by the job acquisition thread
    // This happens if the the job was already acquired, but not yet executed.
    // In that case, we can't allow to delete the job.
    if (job.getLockOwner() != null) {
      throw new ActivitiException("Cannot delete timer job when the job is being executed. Try again later.");
    }
    return job;
  }

}
    

    

    

                
 
            

    

                
 
            



    
    






    
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