[44] | 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.lang.reflect.Method; |
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| 5 | import java.util.ArrayList; |
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| 6 | import java.util.Collection; |
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| 7 | import java.util.HashMap; |
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| 8 | import java.util.List; |
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| 9 | import java.util.Map; |
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| 10 | import java.util.Properties; |
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| 11 | |
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| 12 | import omq.Remote; |
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| 13 | import omq.common.broker.Broker; |
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| 14 | import omq.common.event.Event; |
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| 15 | import omq.common.event.EventListener; |
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| 16 | import omq.common.event.EventWrapper; |
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| 17 | import omq.common.util.ParameterQueue; |
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| 18 | import omq.common.util.Serializer; |
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| 19 | import omq.exception.SerializerException; |
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| 20 | |
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| 21 | import com.rabbitmq.client.Channel; |
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| 22 | import com.rabbitmq.client.ConsumerCancelledException; |
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| 23 | import com.rabbitmq.client.QueueingConsumer; |
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| 24 | import com.rabbitmq.client.QueueingConsumer.Delivery; |
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| 25 | import com.rabbitmq.client.ShutdownSignalException; |
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| 26 | |
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| 27 | /** |
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| 28 | * |
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| 29 | * @author Sergi Toda <sergi.toda@estudiants.urv.cat> |
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| 30 | * |
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| 31 | */ |
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| 32 | public abstract class RemoteObject extends Thread implements Remote { |
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| 33 | |
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| 34 | private static final long serialVersionUID = -1778953938739846450L; |
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| 35 | |
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| 36 | private String UID; |
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| 37 | private Properties env; |
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| 38 | private transient RemoteWrapper remoteWrapper; |
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| 39 | private transient Map<String, List<Class<?>>> params; |
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| 40 | private transient Channel channel; |
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| 41 | private transient QueueingConsumer consumer; |
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| 42 | private transient boolean killed = false; |
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| 43 | |
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| 44 | private static final Map<String, Class<?>> primitiveClasses = new HashMap<String, Class<?>>(); |
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| 45 | |
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| 46 | static { |
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| 47 | primitiveClasses.put("byte", Byte.class); |
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| 48 | primitiveClasses.put("short", Short.class); |
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| 49 | primitiveClasses.put("char", Character.class); |
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| 50 | primitiveClasses.put("int", Integer.class); |
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| 51 | primitiveClasses.put("long", Long.class); |
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| 52 | primitiveClasses.put("float", Float.class); |
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| 53 | primitiveClasses.put("double", Double.class); |
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| 54 | } |
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| 55 | |
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| 56 | public RemoteObject() { |
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| 57 | } |
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| 58 | |
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| 59 | public void startRemoteObject(String reference, Properties env) throws Exception { |
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| 60 | this.UID = reference; |
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| 61 | this.env = env; |
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| 62 | |
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| 63 | params = new HashMap<String, List<Class<?>>>(); |
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| 64 | for (Method m : this.getClass().getMethods()) { |
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| 65 | List<Class<?>> list = new ArrayList<Class<?>>(); |
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| 66 | for (Class<?> clazz : m.getParameterTypes()) { |
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| 67 | list.add(clazz); |
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| 68 | } |
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| 69 | params.put(m.getName(), list); |
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| 70 | } |
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| 71 | |
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| 72 | // Get num threads to use |
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| 73 | int numThreads = Integer.parseInt(env.getProperty(ParameterQueue.NUM_THREADS, "1")); |
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| 74 | remoteWrapper = new RemoteWrapper(this, numThreads); |
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| 75 | |
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| 76 | startQueues(); |
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| 77 | |
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| 78 | // Start this listener |
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| 79 | this.start(); |
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| 80 | } |
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| 81 | |
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| 82 | @Override |
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| 83 | public void run() { |
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| 84 | while (!killed) { |
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| 85 | try { |
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| 86 | Delivery delivery = consumer.nextDelivery(); |
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| 87 | System.out.println("RemoteObject: " + UID + " has received a message"); |
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| 88 | remoteWrapper.notifyDelivery(delivery); |
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| 89 | } catch (InterruptedException i) { |
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| 90 | i.printStackTrace(); |
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| 91 | } catch (ShutdownSignalException e) { |
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| 92 | e.printStackTrace(); |
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| 93 | try { |
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| 94 | if (channel.isOpen()) { |
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| 95 | channel.close(); |
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| 96 | } |
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| 97 | startQueues(); |
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| 98 | } catch (Exception e1) { |
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| 99 | try { |
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| 100 | long milis = Long.parseLong(env.getProperty(ParameterQueue.RETRY_TIME_CONNECTION, "2000")); |
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| 101 | Thread.sleep(milis); |
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| 102 | } catch (InterruptedException e2) { |
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| 103 | e2.printStackTrace(); |
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| 104 | } |
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| 105 | e1.printStackTrace(); |
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| 106 | } |
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| 107 | } catch (ConsumerCancelledException e) { |
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| 108 | e.printStackTrace(); |
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| 109 | } catch (SerializerException e) { |
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| 110 | e.printStackTrace(); |
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| 111 | } catch (Exception e) { |
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| 112 | e.printStackTrace(); |
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| 113 | } |
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| 114 | } |
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| 115 | } |
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| 116 | |
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| 117 | @Override |
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| 118 | public String getRef() { |
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| 119 | return UID; |
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| 120 | } |
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| 121 | |
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| 122 | @Override |
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| 123 | public void notifyEvent(Event event) throws IOException, SerializerException { |
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| 124 | event.setTopic(UID); |
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| 125 | EventWrapper wrapper = new EventWrapper(event); |
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| 126 | channel.exchangeDeclare(UID, "fanout"); |
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| 127 | channel.basicPublish(UID, "", null, Serializer.serialize(wrapper)); |
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| 128 | } |
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| 129 | |
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| 130 | public void kill() throws IOException { |
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| 131 | killed = true; |
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| 132 | interrupt(); |
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| 133 | channel.close(); |
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| 134 | remoteWrapper.stopRemoteWrapper(); |
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| 135 | } |
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| 136 | |
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| 137 | public Object invokeMethod(String methodName, Object[] arguments) throws Exception { |
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| 138 | |
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| 139 | // Get the specific method identified by methodName and its arguments |
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| 140 | Method method = loadMethod(methodName, arguments); |
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| 141 | |
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| 142 | return method.invoke(this, arguments); |
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| 143 | } |
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| 144 | |
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| 145 | private Method loadMethod(String methodName, Object[] args) throws NoSuchMethodException { |
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| 146 | Method m = null; |
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| 147 | |
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| 148 | // Obtain the class reference |
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| 149 | Class<?> clazz = this.getClass(); |
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| 150 | Class<?>[] argArray = null; |
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| 151 | |
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| 152 | if (args != null) { |
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| 153 | argArray = new Class<?>[args.length]; |
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| 154 | for (int i = 0; i < args.length; i++) { |
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| 155 | argArray[i] = args[i].getClass(); |
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| 156 | } |
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| 157 | } |
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| 158 | |
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| 159 | try { |
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| 160 | m = clazz.getMethod(methodName, argArray); |
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| 161 | } catch (NoSuchMethodException nsm) { |
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| 162 | m = loadMethodWithPrimitives(methodName, argArray); |
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| 163 | } |
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| 164 | return m; |
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| 165 | } |
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| 166 | |
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| 167 | private Method loadMethodWithPrimitives(String methodName, Class<?>[] argArray) throws NoSuchMethodException { |
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| 168 | if (argArray != null) { |
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| 169 | Method[] methods = this.getClass().getMethods(); |
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| 170 | int length = argArray.length; |
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| 171 | |
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| 172 | for (Method method : methods) { |
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| 173 | String name = method.getName(); |
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| 174 | int argsLength = method.getParameterTypes().length; |
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| 175 | |
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| 176 | if (name.equals(methodName) && length == argsLength) { |
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| 177 | // This array can have primitive types inside |
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| 178 | Class<?>[] params = method.getParameterTypes(); |
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| 179 | |
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| 180 | boolean found = true; |
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| 181 | |
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| 182 | for (int i = 0; i < length; i++) { |
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| 183 | if (params[i].isPrimitive()) { |
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| 184 | Class<?> paramWrapper = primitiveClasses.get(params[i].getName()); |
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| 185 | |
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| 186 | if (!paramWrapper.equals(argArray[i])) { |
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| 187 | found = false; |
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| 188 | break; |
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| 189 | } |
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| 190 | } |
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| 191 | } |
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| 192 | if (found) { |
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| 193 | return method; |
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| 194 | } |
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| 195 | } |
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| 196 | } |
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| 197 | } |
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| 198 | throw new NoSuchMethodException(methodName); |
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| 199 | } |
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| 200 | |
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| 201 | public List<Class<?>> getParams(String methodName) { |
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| 202 | return params.get(methodName); |
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| 203 | } |
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| 204 | |
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| 205 | public Channel getChannel() { |
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| 206 | return channel; |
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| 207 | } |
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| 208 | |
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| 209 | private void startQueues() throws Exception { |
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| 210 | // Get info about which exchange and queue will use |
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| 211 | String exchange = env.getProperty(ParameterQueue.RPC_EXCHANGE); |
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| 212 | String queue = UID; |
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| 213 | String routingKey = UID; |
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| 214 | boolean durable = Boolean.parseBoolean(env.getProperty(ParameterQueue.DURABLE_QUEUES, "false")); |
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| 215 | |
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| 216 | // Start channel |
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| 217 | channel = Broker.getNewChannel(); |
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| 218 | |
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| 219 | // Declares and bindings |
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| 220 | System.out.println("RemoteObject: " + UID + " declaring direct exchange: " + exchange + ", Queue: " + queue); |
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| 221 | channel.exchangeDeclare(exchange, "direct"); |
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| 222 | channel.queueDeclare(queue, durable, false, false, null); |
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| 223 | channel.queueBind(queue, exchange, routingKey); |
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| 224 | |
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| 225 | // Declare the event topic fanout |
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| 226 | System.out.println("RemoteObject: " + UID + " declaring fanout exchange: " + UID); |
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| 227 | channel.exchangeDeclare(UID, "fanout"); |
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| 228 | |
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| 229 | // Declare a new consumer |
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| 230 | consumer = new QueueingConsumer(channel); |
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| 231 | channel.basicConsume(queue, true, consumer); |
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| 232 | } |
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| 233 | |
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| 234 | @Override |
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| 235 | public void addListener(EventListener<?> eventListener) throws Exception { |
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| 236 | } |
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| 237 | |
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| 238 | @Override |
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| 239 | public void removeListener(EventListener<?> eventListener) throws Exception { |
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| 240 | } |
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| 241 | |
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| 242 | @Override |
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| 243 | public Collection<EventListener<?>> getListeners() throws Exception { |
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| 244 | return null; |
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| 245 | } |
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| 246 | |
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| 247 | } |
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