| 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.business; |
| 16 | |
| 17 | import java.awt.image.BufferedImage; |
| 18 | import java.util.Arrays; |
| 19 | |
| 20 | import org.apache.commons.logging.Log; |
| 21 | import org.apache.commons.logging.LogFactory; |
| 22 | |
| 23 | import net.sf.ehcache.Cache; |
| 24 | |
| 25 | import net.sourceforge.hiveboard.Board; |
| 26 | import net.sourceforge.hiveboard.dao.BoardDAO; |
| 27 | import net.sourceforge.hiveboard.drawing.ClearBoardAction; |
| 28 | import net.sourceforge.hiveboard.drawing.CompoundHiliteAction; |
| 29 | import net.sourceforge.hiveboard.drawing.DrawingAction; |
| 30 | import net.sourceforge.hiveboard.util.ImageCache; |
| 31 | import net.sourceforge.hiveboard.util.ImageDef; |
| 32 | import net.sourceforge.hiveboard.util.ImageHolder; |
| 33 | import net.sourceforge.hiveboard.util.RGBImageHolder; |
| 34 | import net.sourceforge.hiveutils.collections.Queue; |
| 35 | import net.sourceforge.hiveutils.collections.impl.QueueImpl; |
| 36 | import net.sourceforge.hiveutils.service.ObjectTools; |
| 37 | |
| 38 | /** |
| 39 | * @author Jean-Francois Poilpret |
| 40 | */ |
| 41 | public class BoardImageHolderImpl extends ImageCache implements BoardImageHolder |
| 42 | { |
| 43 | static private final Log _logger = LogFactory.getLog(BoardImageHolderImpl.class); |
| 44 | |
| 45 | public BoardImageHolderImpl(BoardDAO boardDAO, |
| 46 | ObjectTools objectTools, |
| 47 | Cache cache, |
| 48 | Board board) |
| 49 | { |
| 50 | super(cache, board.getId()); |
| 51 | _boardDAO = boardDAO; |
| 52 | _objectTools = objectTools; |
| 53 | _board = board; |
| 54 | _idSnapshot = _boardDAO.selectCurrentSnapshot(_board.getId()); |
| 55 | if (_idSnapshot == -1) |
| 56 | { |
| 57 | _logger.debug("<init> insert snapshot for board <" + _board.getId() + ">"); |
| 58 | byte[] raster = |
| 59 | new byte[_board.getWidth() * _board.getHeight() * ImageDef.BYTES_PER_PIXEL]; |
| 60 | // Force white background |
| 61 | Arrays.fill(raster, PIXEL_DEFAULT); |
| 62 | ImageHolder holder = new RGBImageHolder(); |
| 63 | holder.setImage(_board.getWidth(), _board.getHeight(), raster); |
| 64 | // Save to cache immediately |
| 65 | writeCache(holder); |
| 66 | byte[] content = _objectTools.compress(raster); |
| 67 | _idSnapshot = _boardDAO.insertSnapshot(_board.getId(), true, content); |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | synchronized public ImageInfo getImage() |
| 72 | { |
| 73 | _logger.debug("getImage() #1 for board " + _board.getId()); |
| 74 | boolean mustWriteCache = false; |
| 75 | // Rebuild the image from DB content |
| 76 | ImageHolder holder = readCache(); |
| 77 | if (holder == null) |
| 78 | { |
| 79 | _logger.debug("getImage() #2"); |
| 80 | byte[] raster = _boardDAO.selectSnapshot(_idSnapshot).getContent(); |
| 81 | raster = _objectTools.uncompress(raster); |
| 82 | holder = new RGBImageHolder(); |
| 83 | holder.setImage(_board.getWidth(), _board.getHeight(), raster); |
| 84 | mustWriteCache = true; |
| 85 | } |
| 86 | if (!_actions.isEmpty()) |
| 87 | { |
| 88 | _logger.debug("getImage() #3"); |
| 89 | updateImage(holder); |
| 90 | mustWriteCache = true; |
| 91 | } |
| 92 | if (mustWriteCache) |
| 93 | { |
| 94 | _logger.debug("getImage() #4"); |
| 95 | writeCache(holder); |
| 96 | } |
| 97 | byte[] action = null; |
| 98 | if (!_hiliteActions.isEmpty()) |
| 99 | { |
| 100 | _logger.debug("getImage() #5"); |
| 101 | action = _objectTools.serialize(_hiliteActions); |
| 102 | } |
| 103 | _logger.debug("getImage() #6"); |
| 104 | ImageInfo info = new ImageInfo(holder.getImageRaster(), action); |
| 105 | _logger.debug("getImage() #7 end"); |
| 106 | return info; |
| 107 | } |
| 108 | |
| 109 | private void updateImage(ImageHolder holder) |
| 110 | { |
| 111 | // First apply actions to image |
| 112 | BufferedImage image = holder.getImage(); |
| 113 | for (DrawingAction action: _actions.take()) |
| 114 | { |
| 115 | action.perform(image); |
| 116 | } |
| 117 | holder.setImage(image); |
| 118 | // Then save image raster to DB |
| 119 | byte[] raster = holder.getImageRaster(); |
| 120 | byte[] content = _objectTools.compress(raster); |
| 121 | _boardDAO.updateSnapshot(_idSnapshot, content); |
| 122 | } |
| 123 | |
| 124 | synchronized public void save() |
| 125 | { |
| 126 | // Rebuild the image from DB content (only if necessary) |
| 127 | if (!_actions.isEmpty()) |
| 128 | { |
| 129 | getImage(); |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | synchronized public void dispose() |
| 134 | { |
| 135 | removeCache(); |
| 136 | } |
| 137 | |
| 138 | synchronized public void addDrawingAction(DrawingAction action) |
| 139 | { |
| 140 | // Optimization when board is cleared => remvoe all previous actions first |
| 141 | if (action instanceof ClearBoardAction && !_actions.isEmpty()) |
| 142 | { |
| 143 | _actions.take(); |
| 144 | } |
| 145 | if (!_hiliteActions.addAction(action)) |
| 146 | { |
| 147 | _hiliteActions.clear(); |
| 148 | _actions.add(action); |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | static final private byte PIXEL_DEFAULT = (byte) 0xFF; |
| 153 | |
| 154 | private final BoardDAO _boardDAO; |
| 155 | private final ObjectTools _objectTools; |
| 156 | private final Board _board; |
| 157 | private int _idSnapshot; |
| 158 | private final Queue<DrawingAction> _actions = new QueueImpl<DrawingAction>(); |
| 159 | private final CompoundHiliteAction _hiliteActions = new CompoundHiliteAction(); |
| 160 | } |