001 /* 002 * Copyright (c) 2007-2015 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 }