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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.runtime;

import org.activiti.engine.api.internal.Internal;

/**
 * Represent a 'path of execution' in a process instance.
 * 
 * Note that a {@link ProcessInstance} also is an execution.
 * 

 */
@Internal
public interface Execution {

  /**
   * The unique identifier of the execution.
   */
  String getId();

  /**
   * Indicates if the execution is suspended.
   */
  boolean isSuspended();

  /**
   * Indicates if the execution is ended.
   */
  boolean isEnded();

  /**
   * Returns the id of the activity where the execution currently is at. Returns null if the execution is not a 'leaf' execution (eg concurrent parent).
   */
  String getActivityId();

  /**
   * Id of the root of the execution tree representing the process instance. It is the same as {@link #getId()} if this execution is the process instance.
   */
  String getProcessInstanceId();

  /**
   * Gets the id of the parent of this execution. If null, the execution represents a process-instance.
   */
  String getParentId();
  
  /**
   * Gets the id of the super execution of this execution.
   */
  String getSuperExecutionId();

  /**
   * Id of the root of the execution tree representing the process instance that has no super execution.
   */
  public String getRootProcessInstanceId();
  
  /**
   * Returns Id of the process instance related to the super execution of this execution.
   */
  public String getParentProcessInstanceId();
  

  /**
   * The tenant identifier of this process instance
   */
  String getTenantId();

  /**
   * Returns the name of this execution.
   */
  String getName();
  
  /**
   * Returns the description of this execution.
   */
  String getDescription();
}