[44] | 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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[49] | 9 | import org.apache.log4j.Logger; |
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| 10 | |
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[44] | 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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[82] | 23 | * Class that inherits from Thread. It's used in the client side. This class |
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| 24 | * gets the deliveries from the server and stores them into the different |
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| 25 | * proxies created. |
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[44] | 26 | * |
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| 27 | * @author Sergi Toda <sergi.toda@estudiants.urv.cat> |
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| 28 | * |
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| 29 | */ |
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| 30 | public class ResponseListener extends Thread { |
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[53] | 31 | private final Logger logger = Logger.getLogger(ResponseListener.class.getName()); |
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[44] | 32 | |
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[53] | 33 | private Broker broker; |
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[44] | 34 | private Channel channel; |
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| 35 | private QueueingConsumer consumer; |
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| 36 | private boolean killed = false; |
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| 37 | private Map<String, Map<String, byte[]>> results; |
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| 38 | private Properties env; |
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| 39 | |
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| 40 | /** |
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[82] | 41 | * ResponseListener constructor |
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[44] | 42 | * |
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[82] | 43 | * @param broker |
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[44] | 44 | * @throws Exception |
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| 45 | */ |
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[53] | 46 | public ResponseListener(Broker broker) throws Exception { |
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| 47 | this.broker = broker; |
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| 48 | env = broker.getEnvironment(); |
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[44] | 49 | |
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| 50 | // Init the hashtable (it's concurrent) |
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[53] | 51 | results = new Hashtable<String, Map<String, byte[]>>(); |
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[44] | 52 | |
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| 53 | startRPCQueue(); |
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| 54 | } |
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| 55 | |
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| 56 | @Override |
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| 57 | public void run() { |
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[54] | 58 | logger.info("ResponseListener started"); |
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[44] | 59 | Delivery delivery; |
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| 60 | String uid_request; |
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| 61 | |
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| 62 | while (!killed) { |
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| 63 | try { |
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| 64 | // Get the delivery |
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| 65 | |
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| 66 | delivery = consumer.nextDelivery(); |
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| 67 | |
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| 68 | BasicProperties props = delivery.getProperties(); |
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| 69 | |
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| 70 | // Get the response with its uid |
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| 71 | uid_request = delivery.getProperties().getCorrelationId(); |
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[50] | 72 | logger.debug("Response received -> proxy reference: " + props.getAppId() + ", corrId: " + uid_request); |
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[44] | 73 | |
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| 74 | // Stores the new response |
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| 75 | Map<String, byte[]> proxyResults = results.get(props.getAppId()); |
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| 76 | |
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| 77 | // Put the result into the proxy results and notify him |
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| 78 | synchronized (proxyResults) { |
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| 79 | // If we haven't received this response before, we store it |
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| 80 | if (!proxyResults.containsKey(uid_request)) { |
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| 81 | proxyResults.put(uid_request, delivery.getBody()); |
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| 82 | proxyResults.notifyAll(); |
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| 83 | } |
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| 84 | } |
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| 85 | } catch (InterruptedException i) { |
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[49] | 86 | logger.error(i.toString(), i); |
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[44] | 87 | } catch (ShutdownSignalException e) { |
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[49] | 88 | logger.error(e.toString(), e); |
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[44] | 89 | try { |
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| 90 | if (channel.isOpen()) { |
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| 91 | channel.close(); |
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| 92 | } |
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| 93 | startRPCQueue(); |
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| 94 | } catch (Exception e1) { |
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| 95 | e1.printStackTrace(); |
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| 96 | try { |
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| 97 | long milis = Long.parseLong(env.getProperty(ParameterQueue.RETRY_TIME_CONNECTION, "2000")); |
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| 98 | Thread.sleep(milis); |
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| 99 | } catch (InterruptedException e2) { |
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[49] | 100 | logger.error(e2.toString(), e2); |
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[44] | 101 | } |
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| 102 | } |
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| 103 | } catch (ConsumerCancelledException e) { |
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[49] | 104 | logger.error(e.toString(), e); |
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[44] | 105 | } catch (Exception e) { |
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[49] | 106 | logger.error(e.toString(), e); |
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[44] | 107 | } |
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| 108 | } |
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| 109 | } |
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| 110 | |
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[82] | 111 | /** |
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| 112 | * This function is used to start the response client queue |
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| 113 | * |
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| 114 | * @throws Exception |
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| 115 | */ |
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[44] | 116 | private void startRPCQueue() throws Exception { |
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[53] | 117 | channel = broker.getNewChannel(); |
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[44] | 118 | |
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| 119 | Map<String, Object> args = null; |
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| 120 | |
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| 121 | String reply_queue = env.getProperty(ParameterQueue.RPC_REPLY_QUEUE); |
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[84] | 122 | boolean durable = Boolean.parseBoolean(env.getProperty(ParameterQueue.DURABLE_QUEUE, "false")); |
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| 123 | boolean exclusive = Boolean.parseBoolean(env.getProperty(ParameterQueue.EXCLUSIVE_QUEUE, "true")); |
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| 124 | boolean autoDelete = Boolean.parseBoolean(env.getProperty(ParameterQueue.AUTO_DELETE_QUEUE, "true")); |
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[44] | 125 | |
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| 126 | int ttl = Integer.parseInt(env.getProperty(ParameterQueue.MESSAGE_TTL_IN_QUEUES, "-1")); |
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| 127 | if (ttl > 0) { |
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| 128 | args = new HashMap<String, Object>(); |
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| 129 | args.put("x-message-ttl", ttl); |
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| 130 | } |
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| 131 | |
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[84] | 132 | if (reply_queue == null) { |
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| 133 | reply_queue = channel.queueDeclare().getQueue(); |
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| 134 | env.setProperty(ParameterQueue.RPC_REPLY_QUEUE, reply_queue); |
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| 135 | } else { |
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| 136 | channel.queueDeclare(reply_queue, durable, exclusive, autoDelete, args); |
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| 137 | } |
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| 138 | logger.info("ResponseListener creating queue: " + reply_queue + ", durable: " + durable + ", exclusive: " + exclusive + ", autoDelete: " + autoDelete |
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| 139 | + ", TTL: " + (ttl > 0 ? ttl : "not set")); |
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[44] | 140 | |
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| 141 | // Declare a new consumer |
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| 142 | consumer = new QueueingConsumer(channel); |
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| 143 | channel.basicConsume(reply_queue, true, consumer); |
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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 | * @param key |
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| 149 | * @return whether the map has the param key |
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| 150 | */ |
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| 151 | public boolean containsKey(String key) { |
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| 152 | return results.containsKey(key); |
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| 153 | } |
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| 154 | |
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| 155 | /** |
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| 156 | * Interrupt and kill the Thread |
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| 157 | * |
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| 158 | * @throws IOException |
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| 159 | */ |
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| 160 | public void kill() throws IOException { |
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[49] | 161 | logger.warn("Killing ResponseListener"); |
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[44] | 162 | interrupt(); |
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| 163 | killed = true; |
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| 164 | channel.close(); |
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| 165 | } |
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| 166 | |
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[82] | 167 | /** |
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| 168 | * This method registers a new proxy into this responseListener |
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| 169 | * |
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| 170 | * @param proxy |
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| 171 | */ |
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[44] | 172 | public void registerProxy(Proxymq proxy) { |
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[82] | 173 | // Since results is a hashtable this method doesn't need to be |
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| 174 | // synchronized |
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[44] | 175 | if (!results.containsKey(proxy.getRef())) { |
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| 176 | results.put(proxy.getRef(), proxy.getResults()); |
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| 177 | } |
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| 178 | } |
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| 179 | } |
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