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.scheduling;
  
  import java.util.Set;
  
  import org.apache.aurora.scheduler.events.PubsubEvent.EventSubscriber;
  import org.apache.aurora.scheduler.storage.Storage.MutableStoreProvider;
  
  /**
   * Enables scheduling and preemption of tasks.
   */
  public interface TaskScheduler extends EventSubscriber {
  
    /**
     * Attempts to schedule a task, possibly performing irreversible actions.
     *
     * @param storeProvider {@code MutableStoreProvider} instance to access data store.
     * @param taskIds The tasks to attempt to schedule.
     * @return Successfully scheduled task IDs. The caller should call schedule again if a given
     *         task ID was not present in the result.
     */
    Set<String> schedule(MutableStoreProvider storeProvider, Set<String> taskIds);
  }
  