1 | package omq.server; |
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2 | |
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3 | import java.io.IOException; |
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4 | import java.util.ArrayList; |
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5 | import java.util.List; |
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6 | import java.util.ListIterator; |
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7 | import java.util.concurrent.atomic.AtomicInteger; |
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8 | |
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9 | import org.apache.log4j.Logger; |
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10 | |
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11 | import omq.common.broker.Broker; |
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12 | |
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13 | import com.rabbitmq.client.AMQP.Queue.DeclareOk; |
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14 | import com.rabbitmq.client.Channel; |
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15 | |
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16 | /** |
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17 | * |
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18 | * @author Sergi Toda <sergi.toda@estudiants.urv.cat> |
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19 | * |
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20 | */ |
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21 | |
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22 | public class RemoteThreadPool extends Thread { |
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23 | private static final Logger logger = Logger.getLogger(RemoteThreadPool.class.getName()); |
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24 | private List<InvocationThread> workers; |
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25 | private AtomicInteger busy; |
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26 | private int minPoolThreads; |
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27 | private int maxPoolThreads; |
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28 | private long refresh; |
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29 | private long keepAliveTime; |
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30 | private int maxMessagesPerThread; |
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31 | |
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32 | private RemoteObject obj; |
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33 | private Broker broker; |
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34 | private boolean killed = false; |
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35 | |
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36 | public RemoteThreadPool(int minPoolThreads, int maxPoolThreads, long refresh, long keepAliveTime, int maxMessagesPerThread, RemoteObject obj, Broker broker) { |
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37 | this.minPoolThreads = minPoolThreads; |
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38 | this.maxPoolThreads = maxPoolThreads; |
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39 | this.refresh = refresh; |
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40 | this.keepAliveTime = keepAliveTime; |
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41 | this.maxMessagesPerThread = maxMessagesPerThread; |
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42 | this.obj = obj; |
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43 | this.broker = broker; |
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44 | |
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45 | workers = new ArrayList<InvocationThread>(minPoolThreads); |
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46 | busy = new AtomicInteger(); |
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47 | } |
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48 | |
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49 | @Override |
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50 | public void run() { |
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51 | |
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52 | /* |
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53 | * Create and start minPoolThreads |
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54 | */ |
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55 | logger.info("ObjectMQ reference: " + obj.getRef() + ", creating: " + minPoolThreads + ", maxPoolThreads: " + maxPoolThreads + ", refresh time: " |
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56 | + refresh + ", keepAlive: " + keepAliveTime + ", maxMessagesPerThread: " + maxMessagesPerThread); |
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57 | |
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58 | for (int i = 0; i < minPoolThreads; i++) { |
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59 | try { |
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60 | InvocationThread iThread = new InvocationThread(obj); |
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61 | workers.add(iThread); |
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62 | iThread.start(); |
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63 | } catch (Exception e) { |
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64 | logger.error("Error while creating pool threads", e); |
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65 | e.printStackTrace(); |
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66 | } |
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67 | } |
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68 | |
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69 | while (!killed) { |
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70 | |
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71 | try { |
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72 | Channel channel = broker.getChannel(); |
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73 | DeclareOk dok = channel.queueDeclarePassive(obj.getRef()); |
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74 | |
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75 | int numConsumers = dok.getConsumerCount(); |
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76 | int numMessages = dok.getMessageCount(); |
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77 | int division = numMessages / numConsumers; |
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78 | int numWorkers = workers.size(); |
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79 | |
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80 | if (numWorkers < maxPoolThreads && division >= maxMessagesPerThread) { |
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81 | // Create a new thread |
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82 | System.out.println("Add worker"); |
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83 | InvocationThread worker = new InvocationThread(obj); |
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84 | workers.add(worker); |
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85 | worker.start(); |
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86 | } else if (numWorkers > minPoolThreads && busy.get() < numWorkers) { |
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87 | // Kill idle threads |
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88 | System.out.println("Kill lazy workers, numWorkers = " + numWorkers + ", minPool = " + minPoolThreads + ", busy = " + busy.get()); |
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89 | stopIdleThreads(); |
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90 | } |
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91 | |
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92 | Thread.sleep(refresh); |
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93 | |
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94 | } catch (Exception e) { |
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95 | e.printStackTrace(); |
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96 | logger.error(e); |
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97 | } |
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98 | } |
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99 | |
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100 | } |
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101 | |
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102 | private void stopIdleThreads() { |
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103 | long now = System.currentTimeMillis(); |
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104 | |
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105 | ListIterator<InvocationThread> lIter = workers.listIterator(); |
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106 | while (workers.size() > minPoolThreads && lIter.hasNext()) { |
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107 | InvocationThread worker = lIter.next(); |
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108 | long lastExec = worker.getLastExecution(); |
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109 | System.out.println("last - now = " + (now - lastExec) + " keep alive = " + keepAliveTime); |
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110 | if (worker.isIdle() && (now - lastExec) > keepAliveTime) { |
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111 | // Kill thread |
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112 | try { |
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113 | worker.kill(); |
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114 | lIter.remove(); |
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115 | } catch (IOException e) { |
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116 | logger.error(e); |
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117 | } |
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118 | |
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119 | } |
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120 | } |
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121 | } |
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122 | |
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123 | public void kill() throws IOException { |
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124 | killed = true; |
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125 | for (InvocationThread iThread : workers) { |
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126 | iThread.kill(); |
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127 | } |
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128 | interrupt(); |
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129 | } |
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130 | |
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131 | public List<InvocationThread> getWorkers() { |
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132 | return workers; |
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133 | } |
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134 | |
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135 | public void setWorkers(List<InvocationThread> workers) { |
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136 | this.workers = workers; |
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137 | } |
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138 | |
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139 | public AtomicInteger getBusy() { |
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140 | return busy; |
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141 | } |
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142 | |
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143 | public void setBusy(AtomicInteger busy) { |
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144 | this.busy = busy; |
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145 | } |
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146 | |
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147 | public int getMinPoolThreads() { |
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148 | return minPoolThreads; |
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149 | } |
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150 | |
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151 | public void setMinPoolThreads(int minPoolThreads) { |
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152 | this.minPoolThreads = minPoolThreads; |
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153 | } |
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154 | |
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155 | public int getMaxPoolThreads() { |
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156 | return maxPoolThreads; |
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157 | } |
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158 | |
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159 | public void setMaxPoolThreads(int maxPoolThreads) { |
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160 | this.maxPoolThreads = maxPoolThreads; |
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161 | } |
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162 | |
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163 | public long getRefresh() { |
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164 | return refresh; |
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165 | } |
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166 | |
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167 | public void setRefresh(long refresh) { |
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168 | this.refresh = refresh; |
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169 | } |
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170 | |
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171 | public long getKeepAliveTime() { |
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172 | return keepAliveTime; |
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173 | } |
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174 | |
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175 | public void setKeepAliveTime(long keepAliveTime) { |
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176 | this.keepAliveTime = keepAliveTime; |
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177 | } |
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178 | |
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179 | public int getMaxMessagesPerThread() { |
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180 | return maxMessagesPerThread; |
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181 | } |
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182 | |
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183 | public void setMaxMessagesPerThread(int maxMessagesPerThread) { |
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184 | this.maxMessagesPerThread = maxMessagesPerThread; |
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185 | } |
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186 | |
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187 | } |
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