/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.reef.bridge.driver.client;

import org.apache.reef.bridge.driver.client.grpc.DriverClientService;
import org.apache.reef.tang.annotations.DefaultImplementation;

import java.io.IOException;

/**
 * Interface that driver client services implement.
 */
@DefaultImplementation(DriverClientService.class)
public interface IDriverClientService {

  /**
   * Start the DriverClient service.
   * @throws IOException when unable to start service
   */
  void start() throws IOException;


  /**
   * Notify that the count number of evaluators have been
   * requested by the application.
   * @param count of the number of evaluators
   */
  void notifyEvaluatorRequest(final int count);

  /**
   * Wait for termination of driver client service.
   */
  void awaitTermination() throws InterruptedException;

}