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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.camunda.bpm.engine.externaltask;

import java.util.Date;

import org.camunda.bpm.engine.ExternalTaskService;

/**
 * Represents an instance of an external task that is created when
 * a service-task like activity (i.e. service task, send task, ...) with
 * attribute camunda:type="external" is executed.
 *
 * @author Thorben Lindhauer
 */
public interface ExternalTask {

  /**
   * @return the id of the task
   */
  String getId();

  /**
   * @return the name of the topic the task belongs to
   */
  String getTopicName();

  /**
   * @return the id of the worker that has locked the task
   */
  String getWorkerId();

  /**
   * @return the absolute time at which the lock expires
   */
  Date getLockExpirationTime();

  /**
   * @return the id of the process instance the task exists in
   */
  String getProcessInstanceId();

  /**
   * @return the id of the execution that the task is assigned to
   */
  String getExecutionId();

  /**
   * @return the id of the activity for which the task is created
   */
  String getActivityId();

  /**
   * @return the id of the activity instance in which context the task exists
   */
  String getActivityInstanceId();

  /**
   * @return the id of the process definition the task's activity belongs to
   */
  String getProcessDefinitionId();

  /**
   * @return the key of the process definition the task's activity belongs to
   */
  String getProcessDefinitionKey();

  /**
   * @return the number of retries left. The number of retries is provided by
   *   a task client, therefore the initial value is null.
   */
  Integer getRetries();

  /**
   * @return the error message submitted with the latest reported failure executing this task;
   *   null if no failure was reported previously or if no error message
   *   was submitted
   *
   * @see ExternalTaskService#handleFailure(String, String, String, int, long)
   */
  String getErrorMessage();

  /**
   * @return true if the external task is suspended; a suspended external task
   * cannot be completed, thereby preventing process continuation
   */
  boolean isSuspended();

  /**
   * @return the id of the tenant the task belongs to. Can be null
   * if the task belongs to no single tenant.
   */
  String getTenantId();

}