1 | package omq.client.listener; |
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2 | |
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3 | import java.io.IOException; |
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4 | import java.util.HashMap; |
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5 | import java.util.Hashtable; |
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6 | import java.util.Map; |
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7 | import java.util.Properties; |
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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.client.proxy.Proxymq; |
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12 | import omq.common.broker.Broker; |
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13 | import omq.common.util.ParameterQueue; |
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14 | |
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15 | import com.rabbitmq.client.AMQP.BasicProperties; |
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16 | import com.rabbitmq.client.Channel; |
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17 | import com.rabbitmq.client.ConsumerCancelledException; |
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18 | import com.rabbitmq.client.QueueingConsumer; |
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19 | import com.rabbitmq.client.QueueingConsumer.Delivery; |
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20 | import com.rabbitmq.client.ShutdownSignalException; |
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21 | |
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22 | /** |
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23 | * Class that inherits from RemoteListener. It's used in the server side. This |
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24 | * class gets the deliveries from the server and stores them into the proxies |
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25 | * |
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26 | * @author Sergi Toda <sergi.toda@estudiants.urv.cat> |
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27 | * |
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28 | */ |
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29 | public class ResponseListener extends Thread { |
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30 | private final Logger logger = Logger.getLogger(ResponseListener.class.getName()); |
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31 | |
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32 | private Broker broker; |
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33 | private Channel channel; |
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34 | private QueueingConsumer consumer; |
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35 | private boolean killed = false; |
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36 | private Map<String, Map<String, byte[]>> results; |
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37 | private Properties env; |
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38 | |
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39 | /** |
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40 | * Protected constructor used by the singleton pattern |
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41 | * |
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42 | * @param env |
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43 | * @throws Exception |
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44 | */ |
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45 | public ResponseListener(Broker broker) throws Exception { |
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46 | this.broker = broker; |
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47 | env = broker.getEnvironment(); |
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48 | |
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49 | // Init the hashtable (it's concurrent) |
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50 | results = new Hashtable<String, Map<String, byte[]>>(); |
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51 | |
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52 | startRPCQueue(); |
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53 | } |
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54 | |
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55 | @Override |
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56 | public void run() { |
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57 | logger.info("ResponseListener started"); |
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58 | Delivery delivery; |
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59 | String uid_request; |
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60 | |
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61 | while (!killed) { |
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62 | try { |
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63 | // Get the delivery |
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64 | |
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65 | delivery = consumer.nextDelivery(); |
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66 | |
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67 | BasicProperties props = delivery.getProperties(); |
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68 | |
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69 | // Get the response with its uid |
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70 | uid_request = delivery.getProperties().getCorrelationId(); |
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71 | logger.debug("Response received -> proxy reference: " + props.getAppId() + ", corrId: " + uid_request); |
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72 | |
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73 | // Stores the new response |
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74 | Map<String, byte[]> proxyResults = results.get(props.getAppId()); |
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75 | |
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76 | // Put the result into the proxy results and notify him |
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77 | synchronized (proxyResults) { |
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78 | // If we haven't received this response before, we store it |
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79 | if (!proxyResults.containsKey(uid_request)) { |
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80 | proxyResults.put(uid_request, delivery.getBody()); |
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81 | proxyResults.notifyAll(); |
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82 | } |
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83 | } |
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84 | } catch (InterruptedException i) { |
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85 | logger.error(i.toString(), i); |
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86 | } catch (ShutdownSignalException e) { |
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87 | logger.error(e.toString(), e); |
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88 | try { |
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89 | if (channel.isOpen()) { |
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90 | channel.close(); |
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91 | } |
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92 | startRPCQueue(); |
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93 | } catch (Exception e1) { |
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94 | e1.printStackTrace(); |
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95 | try { |
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96 | long milis = Long.parseLong(env.getProperty(ParameterQueue.RETRY_TIME_CONNECTION, "2000")); |
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97 | Thread.sleep(milis); |
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98 | } catch (InterruptedException e2) { |
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99 | logger.error(e2.toString(), e2); |
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100 | } |
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101 | } |
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102 | } catch (ConsumerCancelledException e) { |
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103 | logger.error(e.toString(), e); |
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104 | } catch (Exception e) { |
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105 | logger.error(e.toString(), e); |
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106 | } |
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107 | } |
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108 | } |
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109 | |
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110 | private void startRPCQueue() throws Exception { |
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111 | channel = broker.getNewChannel(); |
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112 | |
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113 | Map<String, Object> args = null; |
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114 | |
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115 | String reply_queue = env.getProperty(ParameterQueue.RPC_REPLY_QUEUE); |
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116 | boolean durable = Boolean.parseBoolean(env.getProperty(ParameterQueue.DURABLE_QUEUES, "false")); |
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117 | |
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118 | int ttl = Integer.parseInt(env.getProperty(ParameterQueue.MESSAGE_TTL_IN_QUEUES, "-1")); |
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119 | if (ttl > 0) { |
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120 | args = new HashMap<String, Object>(); |
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121 | args.put("x-message-ttl", ttl); |
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122 | } |
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123 | |
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124 | channel.queueDeclare(reply_queue, durable, false, false, args); |
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125 | logger.info("ResponseListener creating queue: " + reply_queue + ", durable: " + durable + "TTL: " + (ttl > 0 ? ttl : "not set")); |
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126 | |
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127 | // Declare a new consumer |
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128 | consumer = new QueueingConsumer(channel); |
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129 | channel.basicConsume(reply_queue, true, consumer); |
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130 | } |
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131 | |
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132 | /** |
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133 | * |
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134 | * @param key |
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135 | * @return whether the map has the param key |
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136 | */ |
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137 | public boolean containsKey(String key) { |
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138 | return results.containsKey(key); |
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139 | } |
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140 | |
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141 | /** |
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142 | * Interrupt and kill the Thread |
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143 | * |
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144 | * @throws IOException |
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145 | */ |
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146 | public void kill() throws IOException { |
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147 | logger.warn("Killing ResponseListener"); |
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148 | interrupt(); |
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149 | killed = true; |
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150 | channel.close(); |
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151 | } |
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152 | |
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153 | // Revisar això |
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154 | public void registerProxy(Proxymq proxy) { |
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155 | if (!results.containsKey(proxy.getRef())) { |
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156 | results.put(proxy.getRef(), proxy.getResults()); |
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157 | } |
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158 | } |
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159 | } |
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