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/* 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 org.activiti.engine.impl.jobexecutor;

import java.util.List;

import org.activiti.engine.impl.cmd.ExecuteJobsCmd;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.interceptor.CommandExecutor;
import org.activiti.engine.impl.persistence.entity.JobEntity;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Tom Baeyens
 * @author Daniel Meyer
 * @author Joram Barrez
 */
public class ExecuteJobsRunnable implements Runnable {

  private static Logger log = LoggerFactory.getLogger(ExecuteJobsRunnable.class);

  protected JobEntity job;
  protected List jobIds;
  protected JobExecutor jobExecutor;

  public ExecuteJobsRunnable(JobExecutor jobExecutor, JobEntity job) {
    this.jobExecutor = jobExecutor;
    this.job = job;
  }

  public ExecuteJobsRunnable(JobExecutor jobExecutor, List jobIds) {
    this.jobExecutor = jobExecutor;
    this.jobIds = jobIds;
  }

  public void run() {
    if (jobIds != null) {
      handleMultipleJobs();
    }
    if (job != null) {
      handleSingleJob();
    }
  }

  protected void handleSingleJob() {
    final SingleJobExecutorContext jobExecutorContext = new SingleJobExecutorContext();
    final List currentProcessorJobQueue = jobExecutorContext.getCurrentProcessorJobQueue();
    final CommandExecutor commandExecutor = jobExecutor.getCommandExecutor();

    currentProcessorJobQueue.add(job);

    Context.setJobExecutorContext(jobExecutorContext);
    try {
      while (!currentProcessorJobQueue.isEmpty()) {

        JobEntity currentJob = currentProcessorJobQueue.remove(0);
        try {
          commandExecutor.execute(new ExecuteJobsCmd(currentJob));
        } catch (Throwable e) {
          log.error("exception during job execution: {}", e.getMessage(), e);
        } finally {
          jobExecutor.jobDone(currentJob);
        }
      }
    } finally {
      Context.removeJobExecutorContext();
    }
  }

  protected void handleMultipleJobs() {
    final MultipleJobsExecutorContext jobExecutorContext = new MultipleJobsExecutorContext();
    final List currentProcessorJobQueue = jobExecutorContext.getCurrentProcessorJobQueue();
    final CommandExecutor commandExecutor = jobExecutor.getCommandExecutor();

    currentProcessorJobQueue.addAll(jobIds);

    Context.setJobExecutorContext(jobExecutorContext);
    try {
      while (!currentProcessorJobQueue.isEmpty()) {

        String currentJobId = currentProcessorJobQueue.remove(0);
        try {
          commandExecutor.execute(new ExecuteJobsCmd(currentJobId));
        } catch (Throwable e) {
          log.error("exception during job execution: {}", e.getMessage(), e);
        } finally {
          jobExecutor.jobDone(currentJobId);
        }
      }
    } finally {
      Context.removeJobExecutorContext();
    }
  }
}