1 /* 2 * JBoss, Home of Professional Open Source 3 * Copyright 2014, Red Hat, Inc. and/or its affiliates, and individual 4 * contributors by the @authors tag. See the copyright.txt in the 5 * distribution for a full listing of individual contributors. 6 * 7 * Licensed under the Apache License, Version 2.0 (the "License"); 8 * you may not use this file except in compliance with the License. 9 * You may obtain a copy of the License at 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.jboss.as.quickstarts.wsat.simple; 18 19 import com.arjuna.wst.*; 20 21 import java.io.Serializable; 22 23 /** 24 * An adapter class that exposes the RestaurantManager as a WS-T Atomic Transaction participant. 25 * 26 * @author paul.robinson@redhat.com, 2012-01-04 27 */ 28 public class RestaurantParticipant implements Durable2PCParticipant, Serializable { 29 private static final long serialVersionUID = 1L; 30 31 // The back-end resource for managing bookings 32 private MockRestaurantManager mockRestaurantManager = MockRestaurantManager.getSingletonInstance(); 33 34 // The transaction ID for this transaction 35 private String txID; 36 37 /** 38 * Creates a new participant for this transaction. Participants and transaction instances have a one-to-one mapping. 39 * 40 * @param txID the ID of the transaction tht this participant will be enlisted within. 41 */ 42 public RestaurantParticipant(String txID) { 43 this.txID = txID; 44 } 45 46 /** 47 * Invokes the prepare step of the business logic, reporting activity and outcome. 48 * 49 * @return Prepared where possible, Aborted where necessary. 50 * @throws WrongStateException 51 * @throws SystemException 52 */ 53 public Vote prepare() throws WrongStateException, SystemException { 54 // Log the event and invoke the prepare operation 55 // on the back-end logic. 56 System.out.println("[SERVICE] Prepare called on participant, about to prepare the back-end resource"); 57 boolean success = mockRestaurantManager.prepare(txID); 58 59 // Map the return value from 60 // the business logic to the appropriate Vote type. 61 if (success) { 62 System.out.println("[SERVICE] back-end resource prepared, participant votes prepared"); 63 return new Prepared(); 64 } else { 65 System.out.println("[SERVICE] back-end resource failed to prepare, participant votes aborted"); 66 return new Aborted(); 67 } 68 } 69 70 /** 71 * Invokes the commit step of the business logic. 72 * 73 * @throws WrongStateException 74 * @throws SystemException 75 */ 76 public void commit() throws WrongStateException, SystemException { 77 // Log the event and invoke the commit operation 78 // on the backend business logic. 79 System.out.println("[SERVICE] all participants voted 'prepared', so coordinator tells the participant to commit"); 80 mockRestaurantManager.commit(txID); 81 } 82 83 /** 84 * Invokes the rollback operation on the business logic. 85 * 86 * @throws WrongStateException 87 * @throws SystemException 88 */ 89 public void rollback() throws WrongStateException, SystemException { 90 // Log the event and invoke the rollback operation 91 // on the backend business logic. 92 System.out 93 .println("[SERVICE] one or more participants voted 'aborted' or a failure occurred, so coordinator tells the participant to rollback"); 94 mockRestaurantManager.rollback(txID); 95 } 96 97 public void unknown() throws SystemException { 98 System.out.println("RestaurantParticipantAT.unknown"); 99 } 100 101 public void error() throws SystemException { 102 System.out.println("RestaurantParticipantAT.error"); 103 } 104 105 }