1 | package wjhk.jupload2.upload;
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2 |
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3 | import java.util.concurrent.BlockingQueue;
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4 |
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5 | import wjhk.jupload2.exception.JUploadException;
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6 | import wjhk.jupload2.policies.UploadPolicy;
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7 |
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8 | /**
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9 | * @author etienne_sf
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10 | *
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11 | */
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12 | public class PacketConstructionThread extends Thread {
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13 |
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14 | /** The current upload policy. */
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15 | UploadPolicy uploadPolicy = null;
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16 |
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17 | /** The thread which globally manages the upload */
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18 | FileUploadManagerThread fileUploadManagerThread = null;
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19 |
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20 | /**
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21 | * The queue where each prepared file are stored, for further processing.
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22 | * This class picks files here, and post them to the packetQueue.
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23 | */
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24 | BlockingQueue<UploadFileData> preparedFileQueue = null;
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25 |
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26 | /**
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27 | * The queue where each prepared file will be stored, for further processing
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28 | */
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29 | BlockingQueue<UploadFilePacket> packetQueue = null;
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30 |
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31 | /**
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32 | * The packet this instance is working on.
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33 | */
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34 | UploadFilePacket packetInProgress = null;
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35 |
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36 | /**
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37 | * Indicates when the last file has been received. The last file is the
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38 | * poisonned
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39 | */
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40 | boolean lastFileReceived = false;
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41 |
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42 | PacketConstructionThread(BlockingQueue<UploadFileData> preparedFileQueue,
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43 | BlockingQueue<UploadFilePacket> packetQueue,
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44 | FileUploadManagerThread fileUploadManagerThread,
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45 | UploadPolicy uploadPolicy) {
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46 | // A thread name is very useful, when debugging...
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47 | super("PacketConstructionThread");
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48 |
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49 | this.preparedFileQueue = preparedFileQueue;
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50 | this.packetQueue = packetQueue;
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51 | this.fileUploadManagerThread = fileUploadManagerThread;
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52 | this.uploadPolicy = uploadPolicy;
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53 |
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54 | // Let's construct the first packet...
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55 | this.packetInProgress = new UploadFilePacket(this.uploadPolicy);
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56 | }
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57 |
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58 | /**
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59 | * The actual command to generate packets.
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60 | *
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61 | * @see java.lang.Thread#run()
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62 | */
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63 | @Override
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64 | final public void run() {
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65 | this.uploadPolicy.displayDebug("Start of PacketConstructionThread", 80);
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66 | try { // catch (JUploadException e)
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67 |
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68 | // We loop, and wait for the 'poisonned' UploadFileData to finish.
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69 | try {
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70 | while (!lastFileReceived
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71 | && !this.fileUploadManagerThread.isUploadFinished()) {
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72 | UploadFileData ufd = preparedFileQueue.take();
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73 | receiveNewFile(ufd);
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74 | }
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75 |
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76 | this.uploadPolicy
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77 | .displayDebug(
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78 | "PacketConstructionThread: end of loop, the thread is about to finish",
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79 | 30);
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80 |
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81 | // We may have some file left to send...
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82 | if (this.packetInProgress.size() > 0) {
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83 | this.uploadPolicy
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84 | .displayDebug(
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85 | "Last file received: the current packet is not empty, we send it",
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86 | 30);
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87 | sendCurrentPacket();
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88 | }
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89 | } catch (InterruptedException e) {
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90 | this.uploadPolicy
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91 | .displayWarn("packetConstructionThread received InterruptedException, exiting");
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92 | }
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93 |
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94 | // In standard mode, we should have no more file to manage. The
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95 | // following test is meaningful only if the FilePreparationThread
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96 | // has been finished before (otherwise, other files could enter the
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97 | // queue after this test)
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98 | if (!this.preparedFileQueue.isEmpty()) {
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99 | if (!this.fileUploadManagerThread.isUploadFinished()) {
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100 | // Hum, hum. This should not happen.
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101 | this.uploadPolicy
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102 | .displayWarn("The preparedFileQueue is not empty, at the end of "
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103 | + this.getClass().getName());
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104 | }
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105 | // This can happen, if we are interrupted while working. Let's
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106 | // empty this.
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107 | this.uploadPolicy
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108 | .displayDebug(
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109 | "The PacketConstructionThread is about to finish, but the preparedFileQueue is not empty. Let's clear it.",
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110 | 30);
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111 | while (!this.preparedFileQueue.isEmpty()) {
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112 | this.preparedFileQueue.poll();
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113 | }
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114 | }
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115 | } catch (JUploadException e) {
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116 | this.fileUploadManagerThread.setUploadException(e);
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117 | } finally {
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118 | // To properly finish the job, we send a 'poisonned' packet, so that
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119 | // the FileUploadThread knows it's finished.
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120 | try {
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121 | this.packetQueue.put(new UploadFilePacketPoisonned(
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122 | this.uploadPolicy));
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123 | } catch (InterruptedException e) {
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124 | this.uploadPolicy
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125 | .displayWarn("packetConstructionThread received InterruptedException (while checking if packetQueue is empty), exiting");
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126 | }
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127 | }
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128 | this.uploadPolicy.displayDebug("End of PacketConstructionThread", 80);
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129 | }
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130 |
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131 | /**
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132 | * Called when a new file is received
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133 | *
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134 | * @param uploadFileData
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135 | * @throws JUploadException
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136 | * @throws InterruptedException
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137 | */
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138 | private void receiveNewFile(UploadFileData uploadFileData)
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139 | throws JUploadException, InterruptedException {
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140 | // Are we finished ?
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141 | if (uploadFileData.isPoisonned()) {
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142 | lastFileReceived = true;
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143 | this.uploadPolicy
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144 | .displayDebug(
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145 | "Poisonned UploadFileData received, PacketContructionThread will exit normally",
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146 | 50);
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147 | } else {
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148 | // We try to add the file to the current packet. If it doesn't work,
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149 | // this packet is probably full. We sent it, and add the packet to
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150 | // the new one.
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151 | if (!this.packetInProgress.add(uploadFileData)) {
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152 | // The packet was refused. We send the current one, and retry.
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153 | this.uploadPolicy
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154 | .displayDebug(
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155 | "The file can't be added to the current packet. Let's send this packet first.",
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156 | 80);
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157 | sendCurrentPacket();
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158 | if (!this.packetInProgress.add(uploadFileData)) {
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159 | throw new JUploadException(
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160 | "Could not add file to packet! (filename: "
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161 | + uploadFileData.getFileName() + ")");
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162 | }
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163 | }
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164 |
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165 | // If the current packet is finished, we send it immediatly.
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166 | if (this.packetInProgress.isFull()) {
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167 | sendCurrentPacket();
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168 | }
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169 | }
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170 | }
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171 |
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172 | private void sendCurrentPacket() throws InterruptedException {
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173 | if (this.packetInProgress == null) {
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174 | throw new java.lang.AssertionError(
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175 | this.getClass().getName()
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176 | + ".sendCurrentPacket(): this.packetInProgress may not be null");
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177 | } else if (this.packetInProgress.size() == 0) {
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178 | throw new java.lang.AssertionError(
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179 | this.getClass().getName()
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180 | + ".sendCurrentPacket(): this.packetInProgress.size() may not be 0");
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181 | }
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182 | // If a packet is ready, we post it into the relevant queue.
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183 | this.packetQueue.put(packetInProgress);
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184 |
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185 | // And we start a new one.
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186 | this.packetInProgress = new UploadFilePacket(this.uploadPolicy);
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187 | }
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188 | } |
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