[33] | 1 | package omq.client.remote.response; |
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| 2 | |
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| 3 | import java.util.Hashtable; |
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| 4 | import java.util.Map; |
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| 5 | import java.util.Properties; |
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| 6 | |
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| 7 | import omq.client.proxy.Proxymq; |
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| 8 | import omq.common.remote.RemoteListener; |
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| 9 | import omq.common.util.ParameterQueue; |
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| 10 | |
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| 11 | import com.rabbitmq.client.AMQP.BasicProperties; |
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| 12 | import com.rabbitmq.client.ConsumerCancelledException; |
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| 13 | import com.rabbitmq.client.QueueingConsumer; |
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| 14 | import com.rabbitmq.client.QueueingConsumer.Delivery; |
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| 15 | import com.rabbitmq.client.ShutdownSignalException; |
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| 16 | |
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| 17 | /** |
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| 18 | * Class that inherits from RemoteListener. It's used in the server side. This |
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| 19 | * class gets the deliveries from the server and stores them into the proxies |
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| 20 | * |
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| 21 | * @author Sergi Toda <sergi.toda@estudiants.urv.cat> |
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| 22 | * |
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| 23 | */ |
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| 24 | public class ResponseListener extends RemoteListener { |
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| 25 | private static ResponseListener rListener; |
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| 26 | private Map<String, Map<String, byte[]>> results; |
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| 27 | |
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| 28 | /** |
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| 29 | * Protected constructor used by the singleton pattern |
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| 30 | * |
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| 31 | * @param env |
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| 32 | * @throws Exception |
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| 33 | */ |
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| 34 | protected ResponseListener(Properties env) throws Exception { |
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| 35 | super(env); |
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| 36 | // Init the hashtable (it's concurrent) |
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| 37 | this.results = new Hashtable<String, Map<String, byte[]>>(); |
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| 38 | |
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| 39 | String reply_queue = env.getProperty(ParameterQueue.RPC_REPLY_QUEUE); |
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| 40 | channel.queueDeclare(reply_queue, false, false, false, null); |
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| 41 | |
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| 42 | // Declare a new consumer |
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| 43 | consumer = new QueueingConsumer(channel); |
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| 44 | channel.basicConsume(reply_queue, true, consumer); |
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| 45 | } |
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| 46 | |
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| 47 | @Override |
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| 48 | public void run() { |
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| 49 | Delivery delivery; |
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| 50 | String uid_request; |
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| 51 | |
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| 52 | while (!killed) { |
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| 53 | try { |
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| 54 | // Get the delivery |
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| 55 | |
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| 56 | delivery = consumer.nextDelivery(); |
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| 57 | |
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| 58 | BasicProperties props = delivery.getProperties(); |
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| 59 | |
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| 60 | // Get the response with its uid |
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| 61 | uid_request = delivery.getProperties().getCorrelationId(); |
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| 62 | System.out.println("Response received -> " + uid_request); |
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| 63 | |
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| 64 | // Stores the new response |
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| 65 | Map<String, byte[]> proxyResults = results.get(props.getAppId()); |
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| 66 | |
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| 67 | // Put the result into the proxy results and notify him |
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| 68 | synchronized (proxyResults) { |
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| 69 | // If we haven't received this response before, we store it |
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| 70 | if (!proxyResults.containsKey(uid_request)) { |
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| 71 | proxyResults.put(uid_request, delivery.getBody()); |
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| 72 | proxyResults.notifyAll(); |
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| 73 | } |
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| 74 | } |
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| 75 | } catch (InterruptedException i) { |
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| 76 | i.printStackTrace(); |
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| 77 | } catch (ShutdownSignalException e) { |
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| 78 | e.printStackTrace(); |
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| 79 | } catch (ConsumerCancelledException e) { |
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| 80 | e.printStackTrace(); |
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| 81 | } catch (Exception e) { |
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| 82 | e.printStackTrace(); |
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| 83 | } |
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| 84 | } |
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| 85 | } |
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| 86 | |
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| 87 | /** |
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| 88 | * Static function which initializes the ResponseListener |
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| 89 | * |
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| 90 | * @param env |
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| 91 | * @throws Exception |
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| 92 | */ |
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| 93 | public static void init(Properties env) throws Exception { |
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| 94 | if (rListener == null) { |
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| 95 | rListener = new ResponseListener(env); |
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| 96 | rListener.start(); |
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| 97 | } else { |
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| 98 | throw new Exception("Cannot init because it already exists"); |
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| 99 | } |
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| 100 | } |
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| 101 | |
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| 102 | /** |
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| 103 | * Method to retrieve the unique ResponseListener, this function can also |
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| 104 | * initialize a ResponseListener using and environment |
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| 105 | * |
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| 106 | * @param env |
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| 107 | * @return unique ResponseListener |
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| 108 | * @throws Exception |
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| 109 | */ |
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| 110 | public static ResponseListener getRequestListener(Properties env) throws Exception { |
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| 111 | if (rListener == null) { |
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| 112 | rListener = new ResponseListener(env); |
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| 113 | rListener.start(); |
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| 114 | } else { |
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| 115 | // TODO: create a new exception to indicate that a response listener |
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| 116 | // cannot be init |
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| 117 | throw new Exception("Cannot init because it already exists"); |
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| 118 | } |
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| 119 | return rListener; |
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| 120 | } |
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| 121 | |
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| 122 | public static boolean isVoid() { |
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| 123 | return rListener == null; |
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| 124 | } |
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| 125 | |
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| 126 | /** |
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| 127 | * Method to retrieve the unique ResponseListener |
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| 128 | * |
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| 129 | * @return |
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| 130 | * @throws Exception |
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| 131 | */ |
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| 132 | public static ResponseListener getRequestListener() throws Exception { |
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| 133 | if (rListener == null) { |
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| 134 | throw new Exception("Request listener not initialized"); |
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| 135 | } |
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| 136 | return rListener; |
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| 137 | } |
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| 138 | |
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| 139 | /** |
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| 140 | * |
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| 141 | * @param key |
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| 142 | * @return whether the map has the param key |
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| 143 | */ |
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| 144 | public boolean containsKey(String key) { |
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| 145 | return results.containsKey(key); |
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| 146 | } |
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| 147 | |
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| 148 | /** |
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| 149 | * This method is used to kill the unique responseListener in the system |
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| 150 | * |
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| 151 | * @throws Exception |
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| 152 | */ |
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| 153 | public static void stopResponseListner() throws Exception { |
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| 154 | rListener.kill(); |
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| 155 | rListener = null; |
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| 156 | } |
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| 157 | |
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| 158 | // Revisar això |
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| 159 | public void registerProxy(Proxymq proxy) { |
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| 160 | if (!results.containsKey(proxy.getRef())) { |
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| 161 | results.put(proxy.getRef(), proxy.getResults()); |
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| 162 | } |
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| 163 | } |
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| 164 | } |
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