content: /**
   * 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.apache.aurora.scheduler.cron;
  
  import java.util.Optional;
  
  import org.apache.aurora.scheduler.storage.entities.IJobKey;
  
  /**
   * An execution manager that executes work on a cron schedule.
   */
  public interface CronScheduler {
    /**
     * Gets the cron schedule associated with a scheduling key.
     *
     * @param key Key previously returned from {@link #schedule(CrontabEntry, Runnable)}.
     * @return The task's cron schedule, if a matching task was found.
     */
    Optional<CrontabEntry> getSchedule(IJobKey key);
  }
  