MOA 12.03
Real Time Analytics for Data Streams
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00001 /* 00002 * StandardTaskMonitor.java 00003 * Copyright (C) 2007 University of Waikato, Hamilton, New Zealand 00004 * @author Richard Kirkby ([email protected]) 00005 * 00006 * This program is free software; you can redistribute it and/or modify 00007 * it under the terms of the GNU General Public License as published by 00008 * the Free Software Foundation; either version 3 of the License, or 00009 * (at your option) any later version. 00010 * 00011 * This program is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 * GNU General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU General Public License 00017 * along with this program. If not, see <http://www.gnu.org/licenses/>. 00018 * 00019 */ 00020 package moa.tasks; 00021 00028 public class StandardTaskMonitor implements TaskMonitor { 00029 00030 protected String currentActivityDescription = ""; 00031 00032 protected double currentActivityFractionComplete = -1.0; 00033 00034 protected volatile boolean cancelFlag = false; 00035 00036 protected volatile boolean pauseFlag = false; 00037 00038 protected volatile boolean isComplete = false; 00039 00040 protected volatile boolean resultPreviewRequested = false; 00041 00042 protected volatile Object latestResultPreview = null; 00043 00044 protected volatile ResultPreviewListener resultPreviewer = null; 00045 00046 @Override 00047 public void setCurrentActivity(String activityDescription, 00048 double fracComplete) { 00049 setCurrentActivityDescription(activityDescription); 00050 setCurrentActivityFractionComplete(fracComplete); 00051 } 00052 00053 @Override 00054 public void setCurrentActivityDescription(String activity) { 00055 this.currentActivityDescription = activity; 00056 } 00057 00058 @Override 00059 public void setCurrentActivityFractionComplete(double fracComplete) { 00060 this.currentActivityFractionComplete = fracComplete; 00061 } 00062 00063 @Override 00064 public boolean taskShouldAbort() { 00065 if (this.pauseFlag) { 00066 try { 00067 synchronized (this) { 00068 while (this.pauseFlag && !this.cancelFlag) { 00069 wait(); 00070 } 00071 } 00072 } catch (InterruptedException e) { 00073 } 00074 } 00075 return this.cancelFlag; 00076 } 00077 00078 @Override 00079 public String getCurrentActivityDescription() { 00080 return this.currentActivityDescription; 00081 } 00082 00083 @Override 00084 public double getCurrentActivityFractionComplete() { 00085 return this.currentActivityFractionComplete; 00086 } 00087 00088 @Override 00089 public boolean isCancelled() { 00090 return this.cancelFlag; 00091 } 00092 00093 @Override 00094 public void requestCancel() { 00095 this.cancelFlag = true; 00096 requestResume(); 00097 } 00098 00099 @Override 00100 public void requestPause() { 00101 this.pauseFlag = true; 00102 } 00103 00104 @Override 00105 public synchronized void requestResume() { 00106 this.pauseFlag = false; 00107 notify(); 00108 } 00109 00110 @Override 00111 public boolean isPaused() { 00112 return this.pauseFlag; 00113 } 00114 00115 @Override 00116 public Object getLatestResultPreview() { 00117 return this.latestResultPreview; 00118 } 00119 00120 @Override 00121 public void requestResultPreview() { 00122 this.resultPreviewRequested = true; 00123 } 00124 00125 @Override 00126 public void requestResultPreview(ResultPreviewListener toInform) { 00127 this.resultPreviewer = toInform; 00128 this.resultPreviewRequested = true; 00129 } 00130 00131 @Override 00132 public boolean resultPreviewRequested() { 00133 return this.resultPreviewRequested; 00134 } 00135 00136 @Override 00137 public synchronized void setLatestResultPreview(Object latestPreview) { 00138 this.resultPreviewRequested = false; 00139 this.latestResultPreview = latestPreview; 00140 if (this.resultPreviewer != null) { 00141 this.resultPreviewer.latestPreviewChanged(); 00142 } 00143 this.resultPreviewer = null; 00144 } 00145 }