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
019package org.apache.oozie.service;
020
021import org.apache.oozie.DagEngine;
022import org.apache.oozie.service.Service;
023import org.apache.oozie.service.Services;
024
025/**
026 * Service that return a dag engine for a user.
027 */
028public class DagEngineService implements Service {
029
030    /**
031     * Initialize the service.
032     *
033     * @param services services instance.
034     */
035    public void init(Services services) {
036    }
037
038    /**
039     * Destroy the service.
040     */
041    public void destroy() {
042    }
043
044    /**
045     * Return the public interface of the Dag engine service.
046     *
047     * @return {@link DagEngineService}.
048     */
049    public Class<? extends Service> getInterface() {
050        return DagEngineService.class;
051    }
052
053    /**
054     * Return a Dag engine.
055     *
056     * @param user user for the dag engine.
057     * @return the dag engine for the specified user.
058     */
059    public DagEngine getDagEngine(String user) {
060        return new DagEngine(user);
061    }
062
063    /**
064     * Return a Dag engine for a system user (no user, no group).
065     *
066     * @return a system Dag engine.
067     */
068    public DagEngine getSystemDagEngine() {
069        return new DagEngine();
070    }
071
072}