bundles/org.simantics.utils.ui/src/org/simantics/utils/ui/gfx/rasterize/LazyRasterizer.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 /*\r
  13  * 25.1.2007\r
  14  */\r
  15 package org.simantics.utils.ui.gfx.rasterize;\r
  16 \r
  17 import java.util.LinkedList;\r
  18 \r
  19 import org.eclipse.core.runtime.IProgressMonitor;\r
  20 import org.eclipse.core.runtime.IStatus;\r
  21 import org.eclipse.core.runtime.Status;\r
  22 import org.eclipse.core.runtime.jobs.Job;\r
  23 import org.eclipse.swt.graphics.ImageData;\r
  24 \r
  25 /**\r
  26  * LazyRasterizer\r
  27  * \r
  28  * @author Toni Kalajainen\r
  29  */\r
  30 public class LazyRasterizer {\r
  31 \r
  32     public static void addJob(RasterJob job) {\r
  33         getJob().addJob(job);\r
  34     }\r
  35 \r
  36     public static void addAsFirstJob(RasterJob job) {\r
  37         getJob().addAsFirstJob(job);\r
  38     }\r
  39 \r
  40     public static void removeJob(RasterJob job) {\r
  41         getJob().removeJob(job);\r
  42     }\r
  43 \r
  44     static RasterizeJob job;\r
  45 \r
  46     synchronized static RasterizeJob getJob() {\r
  47         if (job == null)\r
  48             job = new RasterizeJob();\r
  49         return job;\r
  50     }\r
  51 \r
  52     static class RasterizeJob extends Job {\r
  53         LinkedList<RasterJob> queue = new LinkedList<RasterJob>();\r
  54 \r
  55         @SuppressWarnings("unused")\r
  56         private boolean isRunning;\r
  57 \r
  58         public RasterizeJob() {\r
  59             super("Rasterize Job");\r
  60         }\r
  61 \r
  62         @Override\r
  63         protected IStatus run(IProgressMonitor monitor) {\r
  64             //System.out.println(Thread.currentThread());\r
  65             setThread(Thread.currentThread());\r
  66             int taskLeft = 10000;\r
  67             isRunning = true;\r
  68             monitor.beginTask("Rasterizing", taskLeft);\r
  69             try {\r
  70                 // 1. Pick a job\r
  71                 RasterJob job = pullNextJob();\r
  72                 do {\r
  73                     // 2. Check if canceled\r
  74                     if (monitor.isCanceled()) {\r
  75                         cancel();\r
  76                         return Status.CANCEL_STATUS;\r
  77                     }\r
  78                     // 3. rasterize\r
  79                     if (job != null) {\r
  80                         try {\r
  81                             monitor.subTask(job.raster.toString());\r
  82                             ImageData id = job.raster.rasterize(job.width, job.height);\r
  83                             job.listener.rasterizationComplete(job, id);\r
  84                         } catch (Exception e) {\r
  85                             job.listener.rasterizationFailed(job, e);\r
  86                         }\r
  87 \r
  88                         int jobsLeft = jobsLeft();\r
  89                         double workLeft;\r
  90                         if (jobsLeft == 0) {\r
  91                             workLeft = taskLeft;\r
  92                         } else {\r
  93                             workLeft = ((double) taskLeft) / ((double) jobsLeft());\r
  94                         }\r
  95                         int worked = (int) workLeft;\r
  96                         monitor.worked(worked);\r
  97                         taskLeft -= worked;\r
  98                     }\r
  99                     monitor.subTask("");\r
 100                     // 4. Pick next job\r
 101                     job = pullNextJob();\r
 102                 } while (job != null);\r
 103                 isRunning = false;\r
 104 \r
 105             } finally {\r
 106                 monitor.done();\r
 107             }\r
 108             return Status.OK_STATUS;\r
 109         }\r
 110 \r
 111         protected synchronized int jobsLeft() {\r
 112             return queue.size();\r
 113         }\r
 114 \r
 115         protected synchronized RasterJob pullNextJob() {\r
 116             if (queue.isEmpty())\r
 117                 return null;\r
 118             return queue.removeFirst();\r
 119         }\r
 120 \r
 121         public synchronized void clear() {\r
 122             RasterJob jobs[] = queue.toArray(new RasterJob[0]);\r
 123             for (RasterJob j : jobs)\r
 124                 removeJob(j);\r
 125         }\r
 126 \r
 127         public synchronized void addJob(RasterJob job) {            \r
 128             queue.addLast(job);\r
 129             job.status = RasterJobStatus.QUEUED;\r
 130             //if (!isRunning && queue.size()==1)\r
 131                 schedule();\r
 132         }\r
 133 \r
 134         public synchronized void addAsFirstJob(RasterJob job) {            \r
 135             queue.addFirst(job);\r
 136             job.status = RasterJobStatus.QUEUED;\r
 137             //if (!isRunning && queue.size()==1)\r
 138                 schedule();\r
 139         }\r
 140         \r
 141         public synchronized boolean removeJob(RasterJob job) {\r
 142             if (queue.remove(job)) {\r
 143                 job.status = RasterJobStatus.COMPLETE;\r
 144                 job.listener.rasterizationCanceled(job);\r
 145                 return true;\r
 146             }\r
 147             return false;\r
 148         }\r
 149 \r
 150     }\r
 151 \r
 152 }\r