1 | package org.apollo.util;
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2 |
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3 | import java.util.LinkedList;
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4 | import java.util.Queue;
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5 |
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6 | import org.apollo.audio.structure.OverdubbedFrame;
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7 | import org.apollo.audio.structure.TrackGraphLoopException;
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8 | import org.apollo.audio.structure.AudioStructureModel;
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9 | import org.expeditee.gio.EcosystemManager;
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10 | import org.expeditee.gui.FrameIO;
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11 |
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12 | /**
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13 | * Fetches overdubbed frame heirarchies on a dedicated thread.
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14 | *
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15 | * @author Brook Novak
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16 | *
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17 | */
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18 | public class ODFrameHeirarchyFetcher {
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19 |
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20 | private FetchWorker fetcher = null;
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21 |
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22 | /** Using a FIFO queue implementation */
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23 | private Queue<FetchRequest> fetchRequestQueue = new LinkedList<FetchRequest>(); // SHARED RESOURCE
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24 |
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25 | /** Singleton design pattern */
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26 | private static ODFrameHeirarchyFetcher instance = new ODFrameHeirarchyFetcher();
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27 | private ODFrameHeirarchyFetcher() { }
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28 | public static ODFrameHeirarchyFetcher getInstance() {
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29 | return instance;
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30 | }
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31 |
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32 | /**
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33 | * Asynchronously (non-blocking) performs a fetch for a given frame name. Once the fetch is
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34 | * complete the odRec's {@link ODFrameReceiver#receiveResult(OverdubbedFrame, TrackGraphLoopException)}
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35 | * is invoked.
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36 | *
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37 | * If there is a request for the given ODFrameReceiver that is already pending, the old request is replaced
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38 | * if the rootFrameName differs, otherwise the old fetch remains and the new fetch is ignored.
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39 | *
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40 | * @see {@link ODFrameReceiver)}
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41 | *
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42 | * @param rootFrameName
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43 | * The frame name to get the heirarchy for. Must be a valid framename
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44 | *
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45 | * @param odRec
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46 | * The ODFrameReceiver to receive the result.
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47 | *
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48 | * @throws NullPointerException
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49 | * If rootFrameName or odRec is null.
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50 | *
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51 | * @throws IllegalArgumentException
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52 | * If rootFrameName is not a valid framename.
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53 | */
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54 | public void doFetch(String rootFrameName, ODFrameReceiver odRec) {
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55 | if (rootFrameName == null) throw new NullPointerException("rootFrameName");
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56 | if (!FrameIO.isValidFrameName(rootFrameName))
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57 | throw new IllegalArgumentException("rootFrameName is an invalid framename");
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58 |
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59 | if (odRec == null) throw new NullPointerException("odRec");
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60 |
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61 |
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62 | FetchRequest newfr = new FetchRequest(rootFrameName, odRec);
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63 |
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64 | synchronized(fetchRequestQueue) {
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65 |
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66 | // See if a fetch for the receiver already exists
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67 | FetchRequest match = null;
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68 | for (FetchRequest existingfr : fetchRequestQueue) {
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69 | if (newfr.equals(existingfr)) {
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70 | match = existingfr;
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71 | break;
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72 | }
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73 | }
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74 |
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75 | // If a request already exists
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76 | if (match != null) {
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77 | // Check if the new fetch request is for a different odframe
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78 | if (!match.getRootFrameName().equals(rootFrameName)) {
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79 | fetchRequestQueue.remove(match); // replace redundant request
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80 | fetchRequestQueue.add(newfr);
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81 | }
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82 | } else {
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83 | fetchRequestQueue.add(newfr);
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84 | }
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85 |
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86 | // Ensure that the fetch thread is running
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87 | if (fetcher == null || !fetcher.isAlive()) {
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88 | fetcher = new FetchWorker();
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89 | fetcher.start();
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90 | }
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91 | }
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92 |
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93 | }
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94 |
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95 |
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96 | private class FetchWorker extends Thread {
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97 |
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98 | FetchWorker() {
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99 | super("FetchWorker");
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100 | }
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101 |
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102 | public void run() {
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103 |
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104 | while (true) {
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105 |
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106 | FetchRequest request = null;
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107 |
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108 | synchronized(fetchRequestQueue) {
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109 |
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110 | if (!fetchRequestQueue.isEmpty())
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111 | request = fetchRequestQueue.remove();
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112 |
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113 | if (request == null) return;
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114 | }
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115 |
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116 | boolean hasUpdated = false;
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117 | do {
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118 | try {
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119 | AudioStructureModel.getInstance().waitOnUpdates();
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120 | hasUpdated = true;
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121 | } catch (InterruptedException e) {
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122 | e.printStackTrace();
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123 | continue;
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124 | }
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125 | } while (!hasUpdated);
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126 |
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127 | while (true) {
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128 | try {
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129 | request.odFrameResult = AudioStructureModel.getInstance().fetchGraph(request.getRootFrameName());
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130 | break;
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131 | } catch (InterruptedException e) { // cancelled, retry
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132 | /* Consume */
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133 |
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134 | } catch (TrackGraphLoopException e) { // contains loop
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135 | request.loopExResult = e;
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136 | break;
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137 | }
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138 | }
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139 |
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140 | // Run result notification for this request on swing thread
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141 | EcosystemManager.getMiscManager().runOnGIOThread(request);
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142 |
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143 | }
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144 |
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145 |
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146 |
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147 | }
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148 | }
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149 |
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150 | /**
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151 | * Immutable two-tuple for storing fetch requests.
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152 | *
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153 | * @author Brook Novak
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154 | */
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155 | private class FetchRequest implements Runnable {
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156 |
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157 | private String rootFrameName;
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158 | private ODFrameReceiver receiver;
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159 |
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160 | OverdubbedFrame odFrameResult = null;
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161 | TrackGraphLoopException loopExResult = null;
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162 |
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163 | /**
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164 | *
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165 | * @param rootFrameName
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166 | * Must be a valid framename.
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167 | *
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168 | * @param receiver
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169 | */
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170 | public FetchRequest(String rootFrameName, ODFrameReceiver receiver) {
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171 | this.rootFrameName = rootFrameName;
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172 | this.receiver = receiver;
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173 | assert(rootFrameName != null);
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174 | assert(FrameIO.isValidFrameName(rootFrameName)) ;
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175 | assert(receiver != null);
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176 | }
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177 |
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178 | @Override
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179 | public boolean equals(Object obj) {
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180 | return receiver.equals(obj);
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181 | }
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182 |
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183 | @Override
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184 | public int hashCode() {
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185 | return receiver.hashCode();
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186 | }
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187 |
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188 | public ODFrameReceiver getReceiver() {
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189 | return receiver;
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190 | }
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191 |
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192 | public String getRootFrameName() {
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193 | return rootFrameName;
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194 | }
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195 |
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196 | /**
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197 | * To be invoked on swing thread
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198 | */
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199 | public void run() {
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200 | receiver.receiveResult(odFrameResult, loopExResult);
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201 | }
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202 |
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203 | }
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204 |
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205 | /**
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206 | * A frame receive can request for fetches and have their
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207 | * {@link #receiveResult(OverdubbedFrame, TrackGraphLoopException)}
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208 | * method invoked once a result has occured.
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209 | *
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210 | * @author Brook Novak
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211 | */
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212 | public interface ODFrameReceiver {
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213 |
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214 | /**
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215 | * Invoked once a request has been proccessed. <b>This is invoked on the swing thread.</b>
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216 | *
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217 | * @see ODFrameHeirarchyFetcher#doFetch(String, org.apollo.util.ODFrameHeirarchyFetcher.ODFrameReceiver)
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218 | *
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219 | * @param odFrame
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220 | * The overdubbed frame. Null if the frame does not exist - or if it does exist but there are no track widgets on it.
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221 | * Or Null if there was a loop.
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222 | *
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223 | * @param loopEx
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224 | * If there was a loop, then this will be set containing the loop info.
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225 | */
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226 | public void receiveResult(OverdubbedFrame odFrame, TrackGraphLoopException loopEx);
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227 |
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228 | }
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229 |
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230 | }
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