1 | /**
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2 | *#########################################################################
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3 | *
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4 | * A component of the Gatherer application, part of the Greenstone digital
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5 | * library suite from the New Zealand Digital Library Project at the
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6 | * University of Waikato, New Zealand.
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7 | *
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8 | * <BR><BR>
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9 | *
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10 | * Author: John Thompson, Greenstone Digital Library, University of Waikato
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11 | *
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12 | * <BR><BR>
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13 | *
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14 | * Copyright (C) 1999 New Zealand Digital Library Project
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15 | *
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16 | * <BR><BR>
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17 | *
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18 | * This program is free software; you can redistribute it and/or modify
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19 | * it under the terms of the GNU General Public License as published by
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20 | * the Free Software Foundation; either version 2 of the License, or
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21 | * (at your option) any later version.
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22 | *
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23 | * <BR><BR>
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24 | *
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25 | * This program is distributed in the hope that it will be useful,
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26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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28 | * GNU General Public License for more details.
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29 | *
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30 | * <BR><BR>
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31 | *
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32 | * You should have received a copy of the GNU General Public License
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33 | * along with this program; if not, write to the Free Software
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34 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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35 | *########################################################################
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36 | */
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37 | package org.greenstone.gatherer.download;
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38 |
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39 | import java.awt.*;
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40 | import java.io.*;
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41 | import java.net.*;
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42 | import java.util.*;
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43 | import javax.swing.*;
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44 | import javax.swing.tree.*;
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45 | import org.greenstone.gatherer.*;
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46 | import org.greenstone.gatherer.util.SafeProcess;
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47 |
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48 | /** This class provides access to the functionality of the WGet program, either by calling it via a shell script or by the JNI. It maintains a queue of pending jobs, and the component for showing these tasks to the user.
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49 | * @author John Thompson, Greenstone Digital Library, University of Waikato
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50 | * @version 2.3
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51 | */
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52 | public class DownloadScrollPane
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53 | extends Thread {
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54 |
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55 | /** <i>true</i> if verbose debug messages should be displayed, <i>false</i> otherwise. */
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56 | private boolean debug = false;
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57 | /** <i>true</i> if successfully completed tasks should be automatically removed from the job queue. */
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58 | private boolean remove_complete_jobs = true;
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59 |
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60 | private JPanel filler_pane = null;
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61 | /** The panel that the task list will be shown in. */
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62 | private JPanel list_pane;
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63 | /** The job currently underway. */
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64 | private DownloadJob job;
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65 | /** A scroll pane which will be used to display the list of pending tasks. */
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66 | private JScrollPane list_scroll;
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67 | /** A queue of download tasks. */
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68 | private Vector job_queue;
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69 | static final private boolean simple = true;
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70 |
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71 |
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72 | public DownloadScrollPane() {
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73 | job = null;
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74 | job_queue = new Vector();
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75 | filler_pane = new JPanel();
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76 | list_pane = new JPanel();
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77 | list_pane.setLayout(new BoxLayout(list_pane, BoxLayout.Y_AXIS));
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78 | list_scroll = new JScrollPane(list_pane);
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79 | }
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80 |
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81 | /**
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82 | * To be used with DownloadJob.java's old_callDownload() and old_actionPerformed()
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83 | * OR by uncommenting the "synchronized(this)" section in Download.java at the end of
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84 | * its new callDownload() along with commenting out "mummy.deleteCurrentDownloadJob(this);"
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85 | * in Download.java's doneCleanup().
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86 | */
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87 | public void old_deleteDownloadJob(DownloadJob delete_me) {
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88 | if (delete_me == job) {
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89 | try {
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90 | // Wait for the job to finish cleaning up, before we can continue cleaning up here.
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91 | // But sometimes the job has completed (terminated naturally) and in that case there's
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92 | // nothing to wait for.
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93 | synchronized(delete_me) {
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94 | if (!delete_me.hasSignalledStop()) { // don't wait if DownloadJob.COMPLETED
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95 | ///SafeProcess.log("**************** download scrollpane waiting for downloadjob to stop");
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96 | delete_me.wait();
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97 | }
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98 | }
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99 | } catch (Exception e) {
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100 | e.printStackTrace();
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101 | }
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102 | }
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103 |
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104 | ///System.err.println("**************** Deleting job from download scroll pane");
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105 | // Close button pressed, get rid of this download's dedicated pane
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106 | finishedDownloadJob(delete_me, true);
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107 | }
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108 |
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109 | /**
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110 | * If called to delete the current download job, this method won't do anything.
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111 | * But if called on any inactive download job, its display is removed.
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112 | */
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113 | public void deleteDownloadJob(DownloadJob delete_me) {
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114 | if (delete_me != job) {
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115 |
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116 | delete_me.setState(DownloadJob.STOPPED); // it's not the current job, so not running any SafeProcess, so don't need to send interrupt, just set state to stopped
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117 | SafeProcess.log("**************** Deleting job from download scroll pane");
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118 | // Close button pressed, get rid of this download's dedicated pane
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119 | finishedDownloadJob(delete_me, true);
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120 | } // else don't do anything, we'll be contacted again when the current job can be deleted
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121 |
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122 | }
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123 |
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124 | /**
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125 | * To be called when we're ready to delete the current download job,
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126 | * else this method won't do anything
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127 | */
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128 | public void deleteCurrentDownloadJob(DownloadJob delete_me) {
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129 | if (delete_me == job) {
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130 | SafeProcess.log("**************** Deleting current job from download scroll pane");
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131 | // Close button pressed, get rid of this download's dedicated pane
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132 | finishedDownloadJob(delete_me, true);
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133 | }
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134 | }
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135 |
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136 |
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137 | /** To be called when a download job has terminated naturally or was prematurely stopped
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138 | * via the close button.
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139 | * Gets rid of this download's pane with buttons and progress bar if prematurely stopped. */
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140 | protected void finishedDownloadJob(DownloadJob delete_me, boolean removeDisplay) {
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141 | if (delete_me.hasSignalledStop()) {
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142 | if(removeDisplay) {
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143 | list_pane.remove(delete_me.getProgressBar());
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144 | list_pane.remove(filler_pane);
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145 | }
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146 | job_queue.remove(delete_me);
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147 | if(job_queue.size() > 0) {
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148 | Dimension progress_bar_size = delete_me.getProgressBar().getPreferredSize();
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149 | Dimension list_pane_size = list_pane.getSize();
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150 | int height = list_pane_size.height - (job_queue.size() * progress_bar_size.height);
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151 | progress_bar_size = null;
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152 | if(height > 0) {
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153 | filler_pane.setPreferredSize(new Dimension(list_pane_size.width, height));
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154 | list_pane.add(filler_pane);
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155 | }
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156 | list_pane_size = null;
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157 | }
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158 | list_pane.updateUI();
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159 | }
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160 | else {
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161 | DebugStream.println("Somehow we're trying to delete a job that is still running.");
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162 | }
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163 | }
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164 |
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165 | public synchronized void downloadComplete() {
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166 | job.downloadComplete();
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167 | }
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168 |
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169 | public synchronized void downloadFailed() {
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170 | job.downloadFailed();
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171 | }
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172 |
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173 | public synchronized void downloadWarning() {
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174 | job.downloadWarning();
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175 | }
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176 |
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177 | public JScrollPane getDownloadJobList() {
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178 | return list_scroll;
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179 | }
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180 |
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181 | public synchronized boolean hasSignalledStop() {
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182 | return job.hasSignalledStop();
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183 | }
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184 |
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185 | public void newDownloadJob(Download download, String mode, Properties proxy_urls) {
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186 | // Create the job and fill in the details from gatherer.config.
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187 |
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188 | DebugStream.println("About to create a new job");
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189 |
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190 | DownloadJob new_job = new DownloadJob(download, Configuration.proxy_pass, Configuration.proxy_user, this, mode, proxy_urls);
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191 | // Tell it to run as soon as possible
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192 |
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193 | new_job.setState(DownloadJob.RUNNING);
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194 |
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195 | // Add to job_queue job list.
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196 | job_queue.add(new_job);
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197 |
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198 | // Now add it to the visual component, job list.
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199 |
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200 | list_pane.remove(filler_pane);
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201 |
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202 | Dimension progress_bar_size = new_job.getProgressBar().getPreferredSize();
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203 |
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204 | Dimension list_pane_size = list_pane.getSize();
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205 |
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206 | int height = list_pane_size.height - (job_queue.size() * progress_bar_size.height);
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207 |
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208 | progress_bar_size = null;
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209 |
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210 | list_pane.add(new_job.getProgressBar());
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211 |
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212 | if(height > 0) {
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213 | filler_pane.setPreferredSize(new Dimension(list_pane_size.width, height));
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214 | list_pane.add(filler_pane);
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215 | }
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216 |
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217 | list_pane_size = null;
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218 | //list_pane.setAlignmentX(Component.LEFT_ALIGNMENT);
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219 | list_pane.updateUI();
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220 | new_job = null; //job = (DownloadJob) job_queue.get(index);
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221 |
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222 | synchronized(this) {
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223 | notify(); // Just incase its sleeping.
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224 | }
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225 | }
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226 |
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227 | public synchronized void updateProgress(long current, long expected) {
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228 | job.updateProgress(current, expected);
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229 | }
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230 |
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231 | /* There may be times when the download thread is sleeping, but the
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232 | * user has indicated that a previously paused job should now begin
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233 | * again. The flag within the job will change, so we tell the thread
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234 | * to start again.
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235 | */
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236 | public void resumeThread() {
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237 | synchronized(this) {
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238 | notify(); // Just incase its sleeping.
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239 | }
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240 | }
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241 |
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242 | public void run() {
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243 | while(true) {
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244 | if(job_queue.size() > 0) {
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245 | while(!job_queue.isEmpty()) {
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246 | job = (DownloadJob) job_queue.firstElement();
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247 |
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248 | if(job.getState() == DownloadJob.RUNNING) {
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249 | DownloadJob delete_me = job;
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250 | String jobDisplayString = job.toString();
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251 | DebugStream.println("DownloadJob " + jobDisplayString + " Begun.");
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252 | System.err.println("DownloadJob " + job.port + " " + job.toString() + " Begun.");
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253 | job.callDownload();
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254 | // Job is done. Ended naturally, don't get rid of this download's separate display panel
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255 | finishedDownloadJob(delete_me, false);
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256 | System.err.println("DownloadJob " + jobDisplayString + " complete.");
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257 | DebugStream.println("DownloadJob " + jobDisplayString + " complete."); // by this point job is null!
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258 | job = null;
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259 | delete_me = null;
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260 | }
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261 | }
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262 | try {
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263 | synchronized(this) {
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264 | DebugStream.println("WGet thread is waiting for DownloadJobs.");
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265 | wait();
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266 | }
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267 | } catch (InterruptedException e) {
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268 | // Time to get going again.
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269 | }
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270 | }
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271 | else {
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272 | try {
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273 | synchronized(this) {
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274 | DebugStream.println("WGet thread is waiting for DownloadJobs.");
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275 | wait();
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276 | }
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277 | } catch (InterruptedException e) {
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278 | // Time to get going again.
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279 | }
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280 | }
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281 | }
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282 | }
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283 | }
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