| 1 | // Copyright 2004-2007 Jean-Francois Poilpret |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package net.sourceforge.hiveboard.model; |
| 16 | |
| 17 | import java.util.HashMap; |
| 18 | import java.util.Map; |
| 19 | |
| 20 | import net.sourceforge.hiveboard.Board; |
| 21 | import net.sourceforge.hiveboard.Event; |
| 22 | import net.sourceforge.hiveboard.EventType; |
| 23 | import net.sourceforge.hiveboard.event.ConstraintEventFilter; |
| 24 | import net.sourceforge.hiveboard.event.Constraints; |
| 25 | import net.sourceforge.hiveboard.event.EventsPriorities; |
| 26 | import net.sourceforge.hiveboard.event.PersistentDeferredConsumer; |
| 27 | import net.sourceforge.hiveboard.main.IdentityHolder; |
| 28 | import net.sourceforge.hiveevents.Channel; |
| 29 | import net.sourceforge.hiveevents.Filter; |
| 30 | |
| 31 | /** |
| 32 | * Service acting as a memory repository of all active Whiteboards in the system. |
| 33 | * <p> |
| 34 | * This service must use the singleton service model. |
| 35 | * |
| 36 | * @author Jean-Francois Poilpret |
| 37 | */ |
| 38 | public class BoardRepositoryImpl implements BoardRepository |
| 39 | { |
| 40 | public BoardRepositoryImpl(Channel<Event> eventChannel, IdentityHolder holder) |
| 41 | { |
| 42 | _identity = holder; |
| 43 | |
| 44 | // Add events listeners |
| 45 | int priority = EventsPriorities.BOARD_REPOSITORY_UPDATE; |
| 46 | String constraint = Constraints.eventType( EventType.EVT_CREATE_BOARD, |
| 47 | EventType.EVT_MODIFY_BOARD); |
| 48 | Filter<Event> filter = new ConstraintEventFilter(constraint); |
| 49 | PersistentDeferredConsumer consumer = new PersistentDeferredConsumer() |
| 50 | { |
| 51 | @Override protected void pushEvent(Event event) |
| 52 | { |
| 53 | int idBoard = event.getWhere(); |
| 54 | Board board = event.getBoard(); |
| 55 | if (board.getParticipants().contains(_identity.getId())) |
| 56 | { |
| 57 | Board oldBoard = _boards.get(idBoard); |
| 58 | if (oldBoard == null) |
| 59 | { |
| 60 | _boards.put(idBoard, board); |
| 61 | } |
| 62 | else |
| 63 | { |
| 64 | // Board already in repository, update it but do not replace it! |
| 65 | Board.copy(board, oldBoard, false); |
| 66 | } |
| 67 | } |
| 68 | else |
| 69 | { |
| 70 | // self has been removed from the board |
| 71 | _boards.remove(idBoard); |
| 72 | } |
| 73 | } |
| 74 | }; |
| 75 | eventChannel.registerPushConsumer(priority, filter, consumer); |
| 76 | |
| 77 | constraint = Constraints.eventType(EventType.EVT_DESTROY_BOARD); |
| 78 | filter = new ConstraintEventFilter(constraint); |
| 79 | consumer = new PersistentDeferredConsumer() |
| 80 | { |
| 81 | @Override protected void pushEvent(Event event) |
| 82 | { |
| 83 | _boards.remove(event.getWhere()); |
| 84 | } |
| 85 | }; |
| 86 | eventChannel.registerPushConsumer(priority, filter, consumer); |
| 87 | |
| 88 | constraint = Constraints.eventType(EventType.EVT_JOIN_BOARD); |
| 89 | filter = new ConstraintEventFilter(constraint); |
| 90 | consumer = new PersistentDeferredConsumer() |
| 91 | { |
| 92 | @Override protected void pushEvent(Event event) |
| 93 | { |
| 94 | Board board = getBoard(event.getWhere()); |
| 95 | board.getPresents().add(event.getWho()); |
| 96 | } |
| 97 | }; |
| 98 | eventChannel.registerPushConsumer(priority, filter, consumer); |
| 99 | |
| 100 | constraint = Constraints.eventType(EventType.EVT_LEAVE_BOARD); |
| 101 | filter = new ConstraintEventFilter(constraint); |
| 102 | consumer = new PersistentDeferredConsumer() |
| 103 | { |
| 104 | @Override protected void pushEvent(Event event) |
| 105 | { |
| 106 | Board board = getBoard(event.getWhere()); |
| 107 | board.getPresents().remove(event.getWho()); |
| 108 | } |
| 109 | }; |
| 110 | eventChannel.registerPushConsumer(priority, filter, consumer); |
| 111 | |
| 112 | constraint = Constraints.eventType(EventType.EVT_BOARD_ADD_PARTICIPANT); |
| 113 | filter = new ConstraintEventFilter(constraint); |
| 114 | consumer = new PersistentDeferredConsumer() |
| 115 | { |
| 116 | @Override protected void pushEvent(Event event) |
| 117 | { |
| 118 | if (event.getBoard() != null) |
| 119 | { |
| 120 | // Actually self is the new participant => new board in repository |
| 121 | _boards.put(event.getWhere(), event.getBoard()); |
| 122 | } |
| 123 | else |
| 124 | { |
| 125 | Board board = getBoard(event.getWhere()); |
| 126 | board.getParticipants().add(event.getWho()); |
| 127 | } |
| 128 | } |
| 129 | }; |
| 130 | eventChannel.registerPushConsumer(priority, filter, consumer); |
| 131 | |
| 132 | constraint = Constraints.eventType(EventType.EVT_BOARD_DEL_PARTICIPANT); |
| 133 | filter = new ConstraintEventFilter(constraint); |
| 134 | consumer = new PersistentDeferredConsumer() |
| 135 | { |
| 136 | @Override protected void pushEvent(Event event) |
| 137 | { |
| 138 | if (event.getWho() == _identity.getId()) |
| 139 | { |
| 140 | // Deleted participant is self |
| 141 | _boards.remove(event.getWhere()); |
| 142 | } |
| 143 | else |
| 144 | { |
| 145 | Board board = getBoard(event.getWhere()); |
| 146 | int who = event.getWho(); |
| 147 | board.getParticipants().remove(who); |
| 148 | // Remove from presents (just in case) |
| 149 | board.getPresents().remove(who); |
| 150 | // If that participant was also writer, then reset writer for the board |
| 151 | if (board.getWriter() == who) |
| 152 | { |
| 153 | board.setWriter(0); |
| 154 | } |
| 155 | } |
| 156 | } |
| 157 | }; |
| 158 | eventChannel.registerPushConsumer(priority, filter, consumer); |
| 159 | |
| 160 | constraint = Constraints.eventType(EventType.EVT_GIVE_TOKEN); |
| 161 | filter = new ConstraintEventFilter(constraint); |
| 162 | consumer = new PersistentDeferredConsumer() |
| 163 | { |
| 164 | @Override protected void pushEvent(Event event) |
| 165 | { |
| 166 | getBoard(event.getWhere()).setWriter(event.getWho()); |
| 167 | } |
| 168 | }; |
| 169 | eventChannel.registerPushConsumer(priority, filter, consumer); |
| 170 | } |
| 171 | |
| 172 | public Board getBoard(int id) |
| 173 | { |
| 174 | return _boards.get(id); |
| 175 | } |
| 176 | |
| 177 | public Board[] getBoards() |
| 178 | { |
| 179 | return _boards.values().toArray(new Board[0]); |
| 180 | } |
| 181 | |
| 182 | private final IdentityHolder _identity; |
| 183 | protected final Map<Integer, Board> _boards = new HashMap<Integer, Board>(); |
| 184 | } |