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.workflow.lite; 019 020 import org.apache.oozie.workflow.WorkflowException; 021 import org.apache.oozie.ErrorCode; 022 023 import java.util.ArrayList; 024 import java.util.Arrays; 025 import java.util.List; 026 027 //TODO javadoc 028 public class JoinNodeDef extends NodeDef { 029 030 JoinNodeDef() { 031 } 032 033 public JoinNodeDef(String name, String transition) { 034 super(name, null, JoinNodeHandler.class, Arrays.asList(transition)); 035 } 036 037 public static class JoinNodeHandler extends NodeHandler { 038 039 public void loopDetection(Context context) throws WorkflowException { 040 String flag = getLoopFlag(context.getNodeDef().getName()); 041 if (context.getVar(flag) != null) { 042 throw new WorkflowException(ErrorCode.E0709, context.getNodeDef().getName()); 043 } 044 String parentExecutionPath = context.getParentExecutionPath(context.getExecutionPath()); 045 String forkCount = context.getVar(ForkNodeDef.FORK_COUNT_PREFIX + parentExecutionPath); 046 if (forkCount == null) { 047 throw new WorkflowException(ErrorCode.E0720, context.getNodeDef().getName()); 048 } 049 int count = Integer.parseInt(forkCount) - 1; 050 if (count == 0) { 051 context.setVar(flag, "true"); 052 } 053 } 054 055 public boolean enter(Context context) throws WorkflowException { 056 String parentExecutionPath = context.getParentExecutionPath(context.getExecutionPath()); 057 String forkCount = context.getVar(ForkNodeDef.FORK_COUNT_PREFIX + parentExecutionPath); 058 if (forkCount == null) { 059 throw new WorkflowException(ErrorCode.E0720, context.getNodeDef().getName()); 060 } 061 int count = Integer.parseInt(forkCount) - 1; 062 if (count > 0) { 063 context.setVar(ForkNodeDef.FORK_COUNT_PREFIX + parentExecutionPath, "" + count); 064 context.deleteExecutionPath(); 065 } 066 else { 067 context.setVar(ForkNodeDef.FORK_COUNT_PREFIX + parentExecutionPath, null); 068 } 069 return (count == 0); 070 } 071 072 public List<String> multiExit(Context context) { 073 String parentExecutionPath = context.getParentExecutionPath(context.getExecutionPath()); 074 // NOW we delete.. 075 context.deleteExecutionPath(); 076 077 String transition = context.getNodeDef().getTransitions().get(0); 078 String fullTransition = context.createFullTransition(parentExecutionPath, transition); 079 List<String> transitions = new ArrayList<String>(1); 080 transitions.add(fullTransition); 081 return transitions; 082 } 083 084 public String exit(Context context) { 085 throw new UnsupportedOperationException(); 086 } 087 088 public void kill(Context context) { 089 } 090 091 public void fail(Context context) { 092 } 093 } 094 095 }