001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 package org.apache.oozie.service; 019 020 import org.apache.oozie.DagEngine; 021 import org.apache.oozie.service.Service; 022 import org.apache.oozie.service.Services; 023 024 /** 025 * Service that return a dag engine for a user. 026 */ 027 public class DagEngineService implements Service { 028 029 /** 030 * Initialize the service. 031 * 032 * @param services services instance. 033 */ 034 public void init(Services services) { 035 } 036 037 /** 038 * Destroy the service. 039 */ 040 public void destroy() { 041 } 042 043 /** 044 * Return the public interface of the Dag engine service. 045 * 046 * @return {@link DagEngineService}. 047 */ 048 public Class<? extends Service> getInterface() { 049 return DagEngineService.class; 050 } 051 052 /** 053 * Return a Dag engine. 054 * 055 * @param user user for the dag engine. 056 * @return the dag engine for the specified user. 057 */ 058 public DagEngine getDagEngine(String user) { 059 return new DagEngine(user); 060 } 061 062 /** 063 * Return a Dag engine for a system user (no user, no group). 064 * 065 * @return a system Dag engine. 066 */ 067 public DagEngine getSystemDagEngine() { 068 return new DagEngine(); 069 } 070 071 }