[44] | 1 | package omq.common.event; |
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| 2 | |
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| 3 | import java.util.HashMap; |
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| 4 | import java.util.Map; |
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| 5 | import java.util.Properties; |
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| 6 | import java.util.Vector; |
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| 7 | |
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| 8 | import omq.common.broker.Broker; |
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| 9 | import omq.common.util.ParameterQueue; |
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| 10 | import omq.common.util.Serializer; |
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| 11 | |
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[49] | 12 | import org.apache.log4j.Logger; |
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| 13 | |
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[44] | 14 | import com.rabbitmq.client.Channel; |
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| 15 | import com.rabbitmq.client.ConsumerCancelledException; |
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| 16 | import com.rabbitmq.client.QueueingConsumer; |
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| 17 | import com.rabbitmq.client.QueueingConsumer.Delivery; |
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| 18 | import com.rabbitmq.client.ShutdownSignalException; |
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| 19 | |
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| 20 | /** |
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| 21 | * This class dispatches the events received in the client side and stores them |
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| 22 | * into the different listeners that could exists among the different proxies |
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| 23 | * generated |
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| 24 | * |
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| 25 | * @author Sergi Toda <sergi.toda@estudiants.urv.cat> |
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| 26 | * |
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| 27 | */ |
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| 28 | @SuppressWarnings("rawtypes") |
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| 29 | public class EventDispatcher extends Thread { |
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[49] | 30 | private static final Logger logger = Logger.getLogger(EventDispatcher.class.getName()); |
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[44] | 31 | |
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[53] | 32 | private Broker broker; |
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| 33 | private Serializer serializer; |
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[44] | 34 | private Map<String, Vector<EventListener>> listeners; |
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| 35 | private Channel channel; |
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| 36 | private QueueingConsumer consumer; |
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| 37 | private Properties env; |
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| 38 | private boolean killed = false; |
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| 39 | |
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[53] | 40 | public EventDispatcher(Broker broker) throws Exception { |
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| 41 | this.broker = broker; |
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| 42 | env = broker.getEnvironment(); |
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| 43 | serializer = broker.getSerializer(); |
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[44] | 44 | |
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| 45 | // Declare the listeners map |
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| 46 | listeners = new HashMap<String, Vector<EventListener>>(); |
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| 47 | |
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| 48 | startEventQueue(); |
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| 49 | } |
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| 50 | |
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| 51 | private void startEventQueue() throws Exception { |
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| 52 | // Get a new connection and a new channel |
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[53] | 53 | channel = broker.getNewChannel(); |
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[44] | 54 | |
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| 55 | String event_queue = env.getProperty(ParameterQueue.EVENT_REPLY_QUEUE); |
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| 56 | boolean durable = Boolean.parseBoolean(env.getProperty(ParameterQueue.DURABLE_QUEUES, "false")); |
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| 57 | channel.queueDeclare(event_queue, durable, false, false, null); |
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| 58 | |
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| 59 | // Declare a new consumer |
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| 60 | consumer = new QueueingConsumer(channel); |
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| 61 | channel.basicConsume(event_queue, true, consumer); |
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| 62 | } |
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| 63 | |
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[53] | 64 | public void kill() throws Exception { |
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[49] | 65 | logger.warn("Stopping EventDispatcher"); |
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[53] | 66 | setListeners(null); |
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| 67 | killed = true; |
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| 68 | interrupt(); |
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| 69 | channel.close(); |
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[44] | 70 | } |
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| 71 | |
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| 72 | @Override |
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| 73 | public void run() { |
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| 74 | Delivery delivery; |
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| 75 | Event event; |
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| 76 | |
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| 77 | while (!killed) { |
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| 78 | try { |
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| 79 | // Get the delivery |
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| 80 | delivery = consumer.nextDelivery(); |
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| 81 | |
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| 82 | // Get the event |
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[53] | 83 | event = serializer.deserializeEvent(delivery.getBody()); |
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[44] | 84 | |
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[49] | 85 | logger.info("Event received -> Topic: " + event.getTopic() + "CorrId: " + event.getCorrId()); |
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[44] | 86 | // Log.saveLog("Client-Deserialize", delivery.getBody()); |
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| 87 | |
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| 88 | // long timeEnd = (new Date()).getTime(); |
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| 89 | // Log.saveTimeSendRequestLog("Client-time-response", |
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| 90 | // event.getCorrId(), "Event!", timeEnd); |
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| 91 | |
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| 92 | // Dispatch it |
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| 93 | dispatch(event.getTopic(), event); |
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| 94 | } catch (InterruptedException i) { |
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[49] | 95 | logger.error(i); |
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[44] | 96 | } catch (ShutdownSignalException e) { |
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[49] | 97 | logger.error(e); |
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[44] | 98 | try { |
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| 99 | if (channel.isOpen()) { |
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| 100 | channel.close(); |
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| 101 | } |
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| 102 | startEventQueue(); |
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| 103 | } catch (Exception e1) { |
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| 104 | try { |
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| 105 | long milis = Long.parseLong(env.getProperty(ParameterQueue.RETRY_TIME_CONNECTION, "2000")); |
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| 106 | Thread.sleep(milis); |
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| 107 | } catch (InterruptedException e2) { |
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[49] | 108 | logger.error(e2); |
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[44] | 109 | } |
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[49] | 110 | logger.error(e1); |
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[44] | 111 | } |
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| 112 | } catch (ConsumerCancelledException e) { |
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[49] | 113 | logger.error(e); |
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[44] | 114 | } catch (Exception e) { |
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[49] | 115 | logger.error(e); |
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[44] | 116 | } |
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| 117 | } |
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| 118 | } |
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| 119 | |
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| 120 | public int addListener(EventListener e) throws Exception { |
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| 121 | // Map<String, ArrayList<EventListener<Event>>> mListeners = |
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| 122 | // listeners.get(e.getTopic()); |
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| 123 | // if(mListeners == null){ |
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| 124 | // mListeners = new HashMap<String, ArrayList<EventListener<Event>>>(); |
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| 125 | // |
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| 126 | // String queueName = env.getProperty(ParameterQueue.EVENT_REPLY_QUEUE); |
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| 127 | // String reference = e.getTopic(); |
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| 128 | // channel.exchangeDeclare(reference, "fanout"); |
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| 129 | // channel.queueBind(queueName, reference, ""); |
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| 130 | // } |
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| 131 | |
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| 132 | Vector<EventListener> vListeners = listeners.get(e.getTopic()); |
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| 133 | if (vListeners == null) { |
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| 134 | vListeners = new Vector<EventListener>(); |
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| 135 | |
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| 136 | String queueName = env.getProperty(ParameterQueue.EVENT_REPLY_QUEUE); |
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| 137 | String reference = e.getTopic(); |
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| 138 | |
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[49] | 139 | logger.info("Declaring fanout -> " + reference + " Binding with: " + queueName); |
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[44] | 140 | |
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| 141 | channel.exchangeDeclare(reference, "fanout"); |
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| 142 | channel.queueBind(queueName, reference, ""); |
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| 143 | } |
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| 144 | vListeners.add(e); |
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| 145 | listeners.put(e.getTopic(), vListeners); |
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| 146 | |
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| 147 | return vListeners.size(); |
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| 148 | } |
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| 149 | |
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| 150 | public int removeListener(EventListener e) { |
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| 151 | Vector<EventListener> vListeners = listeners.get(e.getTopic()); |
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| 152 | if (vListeners != null) { |
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| 153 | // TODO: removeListener -> remove(e) override equals? |
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| 154 | vListeners.remove(e); |
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| 155 | } |
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| 156 | |
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| 157 | return vListeners.size(); |
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| 158 | } |
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| 159 | |
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| 160 | /** |
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| 161 | * This method dispatches the events. Every time an event is received, this |
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| 162 | * method is launched. This method creates a new thread and executes the |
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| 163 | * notifyEvent function of the listeners associated to this event |
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| 164 | * |
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| 165 | * @param topic |
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| 166 | * @param event |
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| 167 | */ |
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| 168 | public void dispatch(String topic, final Event event) { |
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| 169 | if (listeners.containsKey(topic)) { |
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| 170 | for (final EventListener listener : listeners.get(topic)) { |
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| 171 | new Thread() { |
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| 172 | @SuppressWarnings("unchecked") |
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| 173 | public void run() { |
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| 174 | listener.notifyEvent(event); |
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| 175 | } |
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| 176 | }.start(); |
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| 177 | } |
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| 178 | } |
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| 179 | } |
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| 180 | |
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| 181 | public Map<String, Vector<EventListener>> getListeners() { |
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| 182 | return listeners; |
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| 183 | } |
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| 184 | |
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| 185 | public void setListeners(Map<String, Vector<EventListener>> listeners) { |
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| 186 | this.listeners = listeners; |
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| 187 | } |
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| 188 | |
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| 189 | } |
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