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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.history;

import java.util.Date;

import org.activiti.engine.task.TaskInfo;


/**
 * Represents a historic task instance (waiting, finished or deleted) that is stored permanent for 
 * statistics, audit and other business intelligence purposes.
 * 
 * @author Tom Baeyens
 * @author Joram Barrez
 */
public interface HistoricTaskInstance extends TaskInfo, HistoricData {

  /** The reason why this task was deleted {'completed' | 'deleted' | any other user defined string }. */
  String getDeleteReason();
  
  /** Time when the task started. */
  Date getStartTime();

  /** Time when the task was deleted or completed. */
  Date getEndTime();

  /** Difference between {@link #getEndTime()} and {@link #getStartTime()} in milliseconds.  */
  Long getDurationInMillis();
  
  /** Difference between {@link #getEndTime()} and {@link #getClaimTime()} in milliseconds.  */
  Long getWorkTimeInMillis();
  
  /** Time when the task was claimed. */
  Date getClaimTime();
  
}