[33] | 1 | package omq.client.proxy; |
---|
| 2 | |
---|
| 3 | import java.io.IOException; |
---|
| 4 | import java.lang.reflect.InvocationHandler; |
---|
| 5 | import java.lang.reflect.Method; |
---|
| 6 | import java.lang.reflect.Proxy; |
---|
| 7 | import java.util.Collection; |
---|
| 8 | import java.util.Date; |
---|
| 9 | import java.util.HashMap; |
---|
| 10 | import java.util.Hashtable; |
---|
| 11 | import java.util.Map; |
---|
| 12 | import java.util.Properties; |
---|
| 13 | |
---|
| 14 | import omq.Remote; |
---|
| 15 | import omq.client.annotation.AsyncMethod; |
---|
| 16 | import omq.client.annotation.SyncMethod; |
---|
| 17 | import omq.client.remote.response.ResponseListener; |
---|
| 18 | import omq.common.event.Event; |
---|
| 19 | import omq.common.event.EventDispatcher; |
---|
| 20 | import omq.common.event.EventListener; |
---|
| 21 | import omq.common.message.Request; |
---|
| 22 | import omq.common.message.Response; |
---|
| 23 | import omq.common.util.ParameterQueue; |
---|
| 24 | import omq.common.util.Serializer; |
---|
| 25 | import omq.exception.NoContainsInstanceException; |
---|
| 26 | import omq.exception.RetryException; |
---|
| 27 | import omq.exception.SerializerException; |
---|
| 28 | import omq.exception.TimeoutException; |
---|
| 29 | |
---|
| 30 | import com.rabbitmq.client.AMQP.BasicProperties; |
---|
| 31 | import com.rabbitmq.client.Channel; |
---|
| 32 | |
---|
| 33 | /** |
---|
| 34 | * EvoProxy class. This class inherits from InvocationHandler and gives you a |
---|
| 35 | * proxy with a server using an environment |
---|
| 36 | * |
---|
| 37 | * @author Sergi Toda <sergi.toda@estudiants.urv.cat> |
---|
| 38 | * |
---|
| 39 | */ |
---|
| 40 | public class Proxymq implements InvocationHandler, Remote { |
---|
| 41 | |
---|
| 42 | /** |
---|
| 43 | * |
---|
| 44 | */ |
---|
| 45 | private static final long serialVersionUID = 1L; |
---|
| 46 | private static Map<String, Object> proxies = new Hashtable<String, Object>(); |
---|
| 47 | |
---|
| 48 | private String uid; |
---|
| 49 | private transient ResponseListener rListener; |
---|
| 50 | private transient EventDispatcher dispatcher; |
---|
| 51 | private transient Channel channel; |
---|
| 52 | private transient Properties env; |
---|
| 53 | private transient Map<String, byte[]> results; |
---|
| 54 | private transient Map<String, EventListener> listeners; |
---|
| 55 | |
---|
| 56 | private static final Map<String, Class<?>> primitiveClasses = new HashMap<String, Class<?>>(); |
---|
| 57 | static { |
---|
| 58 | primitiveClasses.put("byte", Byte.class); |
---|
| 59 | primitiveClasses.put("short", Short.class); |
---|
| 60 | primitiveClasses.put("char", Character.class); |
---|
| 61 | primitiveClasses.put("int", Integer.class); |
---|
| 62 | primitiveClasses.put("long", Long.class); |
---|
| 63 | primitiveClasses.put("float", Float.class); |
---|
| 64 | primitiveClasses.put("double", Double.class); |
---|
| 65 | } |
---|
| 66 | |
---|
| 67 | /** |
---|
| 68 | * EvoProxy Constructor. |
---|
| 69 | * |
---|
| 70 | * This constructor uses an uid to know which object will call. It also uses |
---|
| 71 | * Properties to set where to send the messages |
---|
| 72 | * |
---|
| 73 | * @param uid |
---|
| 74 | * The uid represents the unique identifier of a remote object |
---|
| 75 | * @param clazz |
---|
| 76 | * It represents the real class of the remote object. With this |
---|
| 77 | * class the system can know the remoteInterface used and it can |
---|
| 78 | * also see which annotations are used |
---|
| 79 | * @param env |
---|
| 80 | * The environment is used to know where to send the messages |
---|
| 81 | * @throws Exception |
---|
| 82 | */ |
---|
| 83 | public Proxymq(String uid, Class<?> clazz, Properties env) throws Exception { |
---|
| 84 | this.uid = uid; |
---|
| 85 | this.rListener = ResponseListener.getRequestListener(); |
---|
| 86 | this.dispatcher = EventDispatcher.getDispatcher(); |
---|
| 87 | |
---|
| 88 | this.channel = rListener.getChannel(); |
---|
| 89 | this.env = env; |
---|
| 90 | |
---|
| 91 | listeners = new HashMap<String, EventListener>(); |
---|
| 92 | |
---|
| 93 | // Create a new hashmap and registry it in rListener |
---|
| 94 | results = new HashMap<String, byte[]>(); |
---|
| 95 | rListener.registerProxy(this); |
---|
| 96 | } |
---|
| 97 | |
---|
| 98 | @Override |
---|
| 99 | public Object invoke(Object proxy, Method method, Object[] arguments) throws Throwable { |
---|
| 100 | //long timeStart = (new Date()).getTime(); |
---|
| 101 | |
---|
| 102 | // Local methods only |
---|
| 103 | String methodName = method.getName(); |
---|
| 104 | |
---|
| 105 | // The local methods will be invoked here |
---|
| 106 | if (method.getDeclaringClass().equals(Remote.class)) { |
---|
| 107 | if (methodName.equals("getRef")) { |
---|
| 108 | return getRef(); |
---|
| 109 | } else if (methodName.equals("addListener")) { |
---|
| 110 | addListener((EventListener) arguments[0]); |
---|
| 111 | return null; |
---|
| 112 | } else if (methodName.equals("removeListener")) { |
---|
| 113 | removeListener((EventListener) arguments[0]); |
---|
| 114 | return null; |
---|
| 115 | } else if (methodName.equals("getListeners")) { |
---|
| 116 | return getListeners(); |
---|
| 117 | } |
---|
| 118 | } |
---|
| 119 | |
---|
| 120 | // Create the request |
---|
| 121 | Request request = createRequest(method, arguments); |
---|
| 122 | |
---|
| 123 | //Log.saveTimeSendRequestLog("Client-time-request", request.getId(), method.getName(), timeStart); |
---|
| 124 | |
---|
| 125 | Object response = null; |
---|
| 126 | // Publish the request |
---|
| 127 | if (request.isAsync()) { |
---|
| 128 | System.out.println("Publish async request -> " + request.getId()); |
---|
| 129 | publishAsyncRequest(request); |
---|
| 130 | } else { |
---|
| 131 | System.out.println("Publish sync request -> " + request.getId()); |
---|
| 132 | response = publishSyncRequest(request, method.getReturnType()); |
---|
| 133 | |
---|
| 134 | //long timeEnd = (new Date()).getTime(); |
---|
| 135 | //Log.saveTimeSendRequestLog("Client-time-response", request.getId(), method.getName(), timeEnd); |
---|
| 136 | } |
---|
| 137 | |
---|
| 138 | return response; |
---|
| 139 | } |
---|
| 140 | |
---|
| 141 | private void publishMessage(Request request, String replyQueueName) throws IOException, SerializerException { |
---|
| 142 | String corrId = request.getId(); |
---|
| 143 | |
---|
| 144 | // Get the environment properties |
---|
| 145 | String exchange = env.getProperty(ParameterQueue.RPC_EXCHANGE); |
---|
| 146 | String routingkey = this.uid; |
---|
| 147 | |
---|
| 148 | // Add the correlation ID and create a replyTo property |
---|
| 149 | BasicProperties props = new BasicProperties.Builder().appId(uid).correlationId(corrId).replyTo(replyQueueName).build(); |
---|
| 150 | |
---|
| 151 | // Publish the message |
---|
| 152 | byte[] bytesRequest = Serializer.serialize(request); |
---|
| 153 | channel.basicPublish(exchange, routingkey, props, bytesRequest); |
---|
| 154 | //Log.saveLog("Client-Serialize", bytesRequest); |
---|
| 155 | } |
---|
| 156 | |
---|
| 157 | private void publishAsyncRequest(Request request) throws IOException, SerializerException { |
---|
| 158 | // Get the environment properties |
---|
| 159 | String replyQueueName = env.getProperty(ParameterQueue.RPC_REPLY_QUEUE); |
---|
| 160 | publishMessage(request, replyQueueName); |
---|
| 161 | } |
---|
| 162 | |
---|
| 163 | private Object publishSyncRequest(Request request, Class<?> type) throws Exception { |
---|
| 164 | String corrId = request.getId(); |
---|
| 165 | |
---|
| 166 | int retries = request.getRetries(); |
---|
| 167 | long timeout = request.getTimeout(); |
---|
| 168 | |
---|
| 169 | // Get the environment properties |
---|
| 170 | String replyQueueName = env.getProperty(ParameterQueue.RPC_REPLY_QUEUE); |
---|
| 171 | |
---|
| 172 | // Publish the message |
---|
| 173 | int i = 0; |
---|
| 174 | while (i < retries) { |
---|
| 175 | try { |
---|
| 176 | publishMessage(request, replyQueueName); |
---|
| 177 | return getResult(corrId, timeout, type); |
---|
| 178 | } catch (TimeoutException te) { |
---|
| 179 | System.out.println("Timeout exception catched " + te); |
---|
| 180 | te.printStackTrace(); |
---|
| 181 | } |
---|
| 182 | i++; |
---|
| 183 | } |
---|
| 184 | throw new RetryException(retries, timeout); |
---|
| 185 | } |
---|
| 186 | |
---|
| 187 | private Request createRequest(Method method, Object[] arguments) { |
---|
| 188 | String corrId = java.util.UUID.randomUUID().toString(); |
---|
| 189 | String methodName = method.getName(); |
---|
| 190 | |
---|
| 191 | // Since we need to know whether the method is async and if it has to |
---|
| 192 | // return using an annotation, we'll only check the AsyncMethod |
---|
| 193 | // annotation |
---|
| 194 | if (method.getAnnotation(AsyncMethod.class) == null) { |
---|
| 195 | int retries = 1; |
---|
| 196 | long timeout = ParameterQueue.DEFAULT_TIMEOUT; |
---|
| 197 | if (method.getAnnotation(SyncMethod.class) != null) { |
---|
| 198 | SyncMethod sync = method.getAnnotation(SyncMethod.class); |
---|
| 199 | retries = sync.retry(); |
---|
| 200 | timeout = sync.timeout(); |
---|
| 201 | } |
---|
| 202 | return Request.newSyncRequest(corrId, methodName, arguments, retries, timeout); |
---|
| 203 | } else { |
---|
| 204 | return Request.newAsyncRequest(corrId, methodName, arguments); |
---|
| 205 | } |
---|
| 206 | } |
---|
| 207 | |
---|
| 208 | private Object getResult(String corrId, long timeout, Class<?> type) throws Exception { |
---|
| 209 | Response resp = null; |
---|
| 210 | |
---|
| 211 | // Wait for the results. |
---|
| 212 | long localTimeout = 0; |
---|
| 213 | long start = System.currentTimeMillis(); |
---|
| 214 | synchronized (results) { |
---|
| 215 | // Due to we are using notifyAll(), we need to control the real time |
---|
| 216 | while (!results.containsKey(corrId) && (timeout - localTimeout) >= 0) { |
---|
| 217 | results.wait(timeout); |
---|
| 218 | localTimeout = System.currentTimeMillis() - start; |
---|
| 219 | } |
---|
| 220 | if ((timeout - localTimeout) <= 0) { |
---|
| 221 | throw new TimeoutException("Timeout exception time: " + timeout); |
---|
| 222 | } |
---|
| 223 | resp = Serializer.deserializeResponse(results.get(corrId), type); |
---|
| 224 | //Log.saveLog("Client-Deserialize", results.get(corrId)); |
---|
| 225 | |
---|
| 226 | // Remove and indicate the key exists (a hashmap can contain a null |
---|
| 227 | // object, using this we'll know whether a response has been |
---|
| 228 | // received before) |
---|
| 229 | results.put(corrId, null); |
---|
| 230 | } |
---|
| 231 | |
---|
| 232 | return resp.getResult(); |
---|
| 233 | } |
---|
| 234 | |
---|
| 235 | /** |
---|
| 236 | * |
---|
| 237 | * @param reference |
---|
| 238 | * RemoteObject reference |
---|
| 239 | * @return true if the proxy has been created before or false in the other |
---|
| 240 | * case |
---|
| 241 | */ |
---|
| 242 | public static boolean containsProxy(String reference) { |
---|
| 243 | return proxies.containsKey(reference); |
---|
| 244 | } |
---|
| 245 | |
---|
| 246 | /** |
---|
| 247 | * |
---|
| 248 | * @param reference |
---|
| 249 | * RemoteObject reference |
---|
| 250 | * @return a proxy instance |
---|
| 251 | * @throws NoContainsInstanceException |
---|
| 252 | */ |
---|
| 253 | public static Object getInstance(String reference) throws NoContainsInstanceException { |
---|
| 254 | if (!containsProxy(reference)) { |
---|
| 255 | throw new NoContainsInstanceException(reference); |
---|
| 256 | } |
---|
| 257 | return proxies.get(reference); |
---|
| 258 | } |
---|
| 259 | |
---|
| 260 | /** |
---|
| 261 | * Returns an instance of a proxy class for the specified interfaces that |
---|
| 262 | * dispatches method invocations to the specified invocation handler. * @param |
---|
| 263 | * loader |
---|
| 264 | * |
---|
| 265 | * @param loader |
---|
| 266 | * the class loader to define the proxy class |
---|
| 267 | * |
---|
| 268 | * @param interfaces |
---|
| 269 | * the list of interfaces for the proxy class to implement |
---|
| 270 | * @param proxy |
---|
| 271 | * the invocation handler to dispatch method invocations to |
---|
| 272 | * @return a proxy instance with the specified invocation handler of a proxy |
---|
| 273 | * class that is defined by the specified class loader and that |
---|
| 274 | * implements the specified interfaces |
---|
| 275 | */ |
---|
| 276 | public static Object newProxyInstance(ClassLoader loader, Class<?>[] interfaces, Proxymq proxy) { |
---|
| 277 | if (proxies.containsKey(proxy.getRef())) { |
---|
| 278 | System.out.println("Proxy trobat"); |
---|
| 279 | return proxies.get(proxy.getRef()); |
---|
| 280 | } |
---|
| 281 | Object value = Proxy.newProxyInstance(loader, interfaces, proxy); |
---|
| 282 | proxies.put(proxy.getRef(), value); |
---|
| 283 | return value; |
---|
| 284 | } |
---|
| 285 | |
---|
| 286 | /** |
---|
| 287 | * Gets the Map used internally to retreive the response of the server |
---|
| 288 | * |
---|
| 289 | * @return a map with all the keys processed. Every key is a correlation id |
---|
| 290 | * of a method invoked remotely |
---|
| 291 | */ |
---|
| 292 | public Map<String, byte[]> getResults() { |
---|
| 293 | return results; |
---|
| 294 | } |
---|
| 295 | |
---|
| 296 | @Override |
---|
| 297 | public String getRef() { |
---|
| 298 | return uid; |
---|
| 299 | } |
---|
| 300 | |
---|
| 301 | @Override |
---|
| 302 | public void notifyEvent(Event event) throws IOException, SerializerException { |
---|
| 303 | } |
---|
| 304 | |
---|
| 305 | @Override |
---|
| 306 | public void addListener(EventListener eventListener) throws Exception { |
---|
| 307 | if (eventListener.getTopic() == null) { |
---|
| 308 | eventListener.setTopic(uid); |
---|
| 309 | } |
---|
| 310 | listeners.put(eventListener.getTopic(), eventListener); |
---|
| 311 | dispatcher.addListener(eventListener); |
---|
| 312 | } |
---|
| 313 | |
---|
| 314 | @Override |
---|
| 315 | public void removeListener(EventListener eventListener) throws Exception { |
---|
| 316 | listeners.remove(eventListener.getTopic()); |
---|
| 317 | dispatcher.removeListener(eventListener); |
---|
| 318 | } |
---|
| 319 | |
---|
| 320 | @Override |
---|
| 321 | public Collection<EventListener> getListeners() throws Exception { |
---|
| 322 | return listeners.values(); |
---|
| 323 | } |
---|
| 324 | |
---|
| 325 | } |
---|