    001/*
    002 * Copyright (c) 2007-2016 Concurrent, Inc. All Rights Reserved.
    003 *
    004 * Project and contact information: http://www.cascading.org/
    005 *
    006 * This file is part of the Cascading project.
    007 *
    008 * Licensed under the Apache License, Version 2.0 (the "License");
    009 * you may not use this file except in compliance with the License.
    010 * You may obtain a copy of the License at
    011 *
    012 *     http://www.apache.org/licenses/LICENSE-2.0
    013 *
    014 * Unless required by applicable law or agreed to in writing, software
    015 * distributed under the License is distributed on an "AS IS" BASIS,
    016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    017 * See the License for the specific language governing permissions and
    018 * limitations under the License.
    019 */
    020
    021package cascading.provider;
    022
    023import java.util.Map;
    024
    025/**
    026 * Interface CascadingService defines a pluggable "service" class that can be loaded by the {@link ServiceLoader}
    027 * utility.
    028 *
    029 * @see ServiceLoader
    030 */
    031public interface CascadingService
    032  {
    033  void setProperties( Map<Object, Object> properties );
    034
    035  /** May be called more than once, but only the first invocation will start the service. */
    036  void startService();
    037
    038  /** May be called more than once, but only the first invocation will stop the service. */
    039  void stopService();
    040
    041  /**
    042   * Returns true if this service has been enabled.
    043   *
    044   * @return boolean
    045   */
    046  boolean isEnabled();
    047  }