    001    /*
    002     * Copyright (c) 2007-2014 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
    021    package cascading.provider;
    022
    023    import 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     */
    031    public 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      }