| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.oozie.workflow.lite; |
| |
| import org.apache.oozie.ErrorCode; |
| import org.apache.oozie.util.XLog; |
| import org.apache.oozie.workflow.WorkflowException; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| |
| /** |
| * Node handler that provides the necessary workflow logic for control nodes: START/END/KILL/FORK/JOIN. |
| */ |
| public abstract class ControlNodeHandler extends NodeHandler { |
| |
| public static final String FORK_COUNT_PREFIX = "workflow.fork."; |
| public XLog LOG = XLog.getLog(getClass()); |
| |
| |
| /** |
| * Called by {@link #enter(Context)} when returning TRUE. |
| * |
| * @param context workflow context |
| * @throws WorkflowException thrown if an error occurred. |
| */ |
| public abstract void touch(Context context) throws WorkflowException; |
| |
| @Override |
| public boolean enter(Context context) throws WorkflowException { |
| boolean doTouch; |
| Class<? extends NodeDef> nodeClass = context.getNodeDef().getClass(); |
| if (nodeClass.equals(StartNodeDef.class)) { |
| if (!context.getSignalValue().equals(StartNodeDef.START)) { |
| throw new WorkflowException(ErrorCode.E0715, context.getSignalValue()); |
| } |
| doTouch = true; |
| } |
| else if (nodeClass.equals(EndNodeDef.class)) { |
| doTouch = true; |
| } |
| else if (nodeClass.equals(KillNodeDef.class)) { |
| doTouch = true; |
| } |
| else if (nodeClass.equals(ForkNodeDef.class)) { |
| doTouch = true; |
| } |
| else if (nodeClass.equals(JoinNodeDef.class)) { |
| String parentExecutionPath = context.getParentExecutionPath(context.getExecutionPath()); |
| String forkCount = context.getVar(FORK_COUNT_PREFIX + parentExecutionPath); |
| |
| if (forkCount == null) { |
| throw new WorkflowException(ErrorCode.E0720, context.getNodeDef().getName()); |
| } |
| int count = Integer.parseInt(forkCount) - 1; |
| if (count > 0) { |
| context.setVar(FORK_COUNT_PREFIX + parentExecutionPath, "" + count); |
| context.deleteExecutionPath(); |
| } |
| else { |
| context.setVar(FORK_COUNT_PREFIX + parentExecutionPath, null); |
| } |
| LOG.debug("count = " + count + " for parent execution path " + parentExecutionPath); |
| |
| doTouch = (count == 0); |
| } |
| else { |
| throw new IllegalStateException("Invalid node type: " + nodeClass); |
| } |
| if (doTouch) { |
| touch(context); |
| } |
| return false; |
| } |
| |
| @Override |
| public String exit(Context context) throws WorkflowException { |
| Class<? extends NodeDef> nodeClass = context.getNodeDef().getClass(); |
| if (nodeClass.equals(StartNodeDef.class)) { |
| return context.getNodeDef().getTransitions().get(0); |
| } |
| else if (nodeClass.equals(EndNodeDef.class)) { |
| context.completeJob(); |
| return null; |
| } |
| else if (nodeClass.equals(KillNodeDef.class)) { |
| context.killJob(); |
| return null; |
| } |
| else if (nodeClass.equals(ForkNodeDef.class)) { |
| throw new UnsupportedOperationException(); |
| } |
| else if (nodeClass.equals(JoinNodeDef.class)) { |
| throw new UnsupportedOperationException(); |
| } |
| else { |
| throw new IllegalStateException("Invalid node type: " + nodeClass); |
| } |
| } |
| |
| @Override |
| public void loopDetection(Context context) |
| throws WorkflowException { |
| Class<? extends NodeDef> nodeClass = context.getNodeDef().getClass(); |
| if (nodeClass.equals(StartNodeDef.class)) { |
| } |
| else if (nodeClass.equals(EndNodeDef.class)) { |
| } |
| else if (nodeClass.equals(KillNodeDef.class)) { |
| } |
| else if (nodeClass.equals(ForkNodeDef.class)) { |
| } |
| else if (nodeClass.equals(JoinNodeDef.class)) { |
| String flag = getLoopFlag(context.getNodeDef().getName()); |
| if (context.getVar(flag) != null) { |
| throw new WorkflowException(ErrorCode.E0709, context.getNodeDef().getName()); |
| } |
| String parentExecutionPath = context.getParentExecutionPath(context.getExecutionPath()); |
| String forkCount = context.getVar(FORK_COUNT_PREFIX + parentExecutionPath); |
| if (forkCount == null) { |
| throw new WorkflowException(ErrorCode.E0720, context.getNodeDef().getName()); |
| } |
| int count = Integer.parseInt(forkCount) - 1; |
| if (count == 0) { |
| context.setVar(flag, "true"); |
| } |
| |
| } |
| else { |
| throw new IllegalStateException("Invalid node type: " + nodeClass); |
| } |
| } |
| |
| @Override |
| public List<String> multiExit(Context context) |
| throws WorkflowException { |
| Class<? extends NodeDef> nodeClass = context.getNodeDef().getClass(); |
| if (nodeClass.equals(StartNodeDef.class)) { |
| return super.multiExit(context); |
| } |
| else if (nodeClass.equals(EndNodeDef.class)) { |
| return super.multiExit(context); |
| } |
| else if (nodeClass.equals(KillNodeDef.class)) { |
| return super.multiExit(context); |
| } |
| else if (nodeClass.equals(ForkNodeDef.class)) { |
| List<String> transitions = context.getNodeDef().getTransitions(); |
| context.setVar(FORK_COUNT_PREFIX + context.getExecutionPath(), "" + transitions.size()); |
| |
| List<String> fullTransitions = new ArrayList<String>(transitions.size()); |
| |
| for (String transition : transitions) { |
| String childExecutionPath = context.createExecutionPath(transition); |
| String fullTransition = context.createFullTransition(childExecutionPath, transition); |
| fullTransitions.add(fullTransition); |
| } |
| return fullTransitions; |
| } |
| else if (nodeClass.equals(JoinNodeDef.class)) { |
| String parentExecutionPath = context.getParentExecutionPath(context.getExecutionPath()); |
| // NOW we delete.. |
| context.deleteExecutionPath(); |
| |
| String transition = context.getNodeDef().getTransitions().get(0); |
| String fullTransition = context.createFullTransition(parentExecutionPath, transition); |
| List<String> transitions = new ArrayList<String>(1); |
| transitions.add(fullTransition); |
| return transitions; |
| } |
| else { |
| throw new IllegalStateException("Invalid node type: " + nodeClass); |
| } |
| } |
| |
| @Override |
| public void kill(Context context) { |
| Class<? extends NodeDef> nodeClass = context.getNodeDef().getClass(); |
| if (nodeClass.equals(StartNodeDef.class)) { |
| //NOP |
| } |
| else if (nodeClass.equals(EndNodeDef.class)) { |
| //NOP |
| } |
| else if (nodeClass.equals(KillNodeDef.class)) { |
| //NOP |
| } |
| else if (nodeClass.equals(ForkNodeDef.class)) { |
| //NOP |
| } |
| else if (nodeClass.equals(JoinNodeDef.class)) { |
| //NOP |
| } |
| else { |
| throw new IllegalStateException("Invalid node type: " + nodeClass); |
| } |
| } |
| |
| @Override |
| public void fail(Context context) { |
| Class<? extends NodeDef> nodeClass = context.getNodeDef().getClass(); |
| if (nodeClass.equals(StartNodeDef.class)) { |
| //NOP |
| } |
| else if (nodeClass.equals(EndNodeDef.class)) { |
| //NOP |
| } |
| else if (nodeClass.equals(KillNodeDef.class)) { |
| //NOP |
| } |
| else if (nodeClass.equals(ForkNodeDef.class)) { |
| //NOP |
| } |
| else if (nodeClass.equals(JoinNodeDef.class)) { |
| //NOP |
| } |
| else { |
| throw new IllegalStateException("Invalid node type: " + nodeClass); |
| } |
| } |
| } |