001    /**
002     * Copyright (c) 2010 Yahoo! Inc. All rights reserved.
003     * Licensed under the Apache License, Version 2.0 (the "License");
004     * you may not use this file except in compliance with the License.
005     * You may obtain a copy of the License at
006     *
007     *   http://www.apache.org/licenses/LICENSE-2.0
008     *
009     *  Unless required by applicable law or agreed to in writing, software
010     *  distributed under the License is distributed on an "AS IS" BASIS,
011     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012     *  See the License for the specific language governing permissions and
013     *  limitations under the License. See accompanying LICENSE file.
014     */
015    package org.apache.oozie.workflow.lite;
016    
017    
018    import org.apache.oozie.workflow.WorkflowApp;
019    import org.apache.oozie.workflow.WorkflowException;
020    import org.apache.oozie.workflow.WorkflowInstance;
021    import org.apache.oozie.workflow.WorkflowLib;
022    import org.apache.oozie.service.Services;
023    import org.apache.oozie.service.UUIDService;
024    import org.apache.oozie.service.UUIDService.ApplicationType;
025    import org.apache.oozie.util.ParamChecker;
026    import org.apache.hadoop.conf.Configuration;
027    
028    import javax.xml.validation.Schema;
029    import java.io.StringReader;
030    
031    //TODO javadoc
032    public abstract class LiteWorkflowLib implements WorkflowLib {
033        private Schema schema;
034        private Class<? extends DecisionNodeHandler> decisionHandlerClass;
035        private Class<? extends ActionNodeHandler> actionHandlerClass;
036    
037        public LiteWorkflowLib(Schema schema, Class<? extends DecisionNodeHandler> decisionHandlerClass,
038                               Class<? extends ActionNodeHandler> actionHandlerClass) {
039            this.schema = schema;
040            this.decisionHandlerClass = decisionHandlerClass;
041            this.actionHandlerClass = actionHandlerClass;
042        }
043    
044        @Override
045        public WorkflowApp parseDef(String appXml) throws WorkflowException {
046            ParamChecker.notEmpty(appXml, "appXml");
047            return new LiteWorkflowAppParser(schema, decisionHandlerClass, actionHandlerClass)
048                    .validateAndParse(new StringReader(appXml));
049        }
050    
051        @Override
052        public WorkflowInstance createInstance(WorkflowApp app, Configuration conf) throws WorkflowException {
053            ParamChecker.notNull(app, "app");
054            String jobId = Services.get().get(UUIDService.class).generateId(ApplicationType.WORKFLOW);
055            return new LiteWorkflowInstance((LiteWorkflowApp) app, conf, jobId);
056        }
057    
058        @Override
059        public WorkflowInstance createInstance(WorkflowApp app, Configuration conf, String wfId) throws WorkflowException {
060            ParamChecker.notNull(app, "app");
061            ParamChecker.notNull(wfId, "wfId");
062            return new LiteWorkflowInstance((LiteWorkflowApp) app, conf, wfId);
063        }
064    }