[44] | 1 | package omq.client.proxy; |
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| 2 | |
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| 3 | import java.io.IOException; |
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| 4 | import java.lang.reflect.InvocationHandler; |
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| 5 | import java.lang.reflect.Method; |
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| 6 | import java.lang.reflect.Proxy; |
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| 7 | import java.util.Collection; |
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| 8 | import java.util.HashMap; |
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| 9 | import java.util.Hashtable; |
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| 10 | import java.util.Map; |
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| 11 | import java.util.Properties; |
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| 12 | |
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[49] | 13 | import org.apache.log4j.Logger; |
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| 14 | |
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[44] | 15 | import omq.Remote; |
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| 16 | import omq.client.annotation.AsyncMethod; |
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| 17 | import omq.client.annotation.SyncMethod; |
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| 18 | import omq.client.listener.ResponseListener; |
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| 19 | import omq.common.broker.Broker; |
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| 20 | import omq.common.event.Event; |
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| 21 | import omq.common.event.EventDispatcher; |
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| 22 | import omq.common.event.EventListener; |
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| 23 | import omq.common.message.Request; |
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| 24 | import omq.common.message.Response; |
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| 25 | import omq.common.util.ParameterQueue; |
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| 26 | import omq.common.util.Serializer; |
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| 27 | import omq.exception.NoContainsInstanceException; |
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| 28 | import omq.exception.OmqException; |
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| 29 | import omq.exception.RetryException; |
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| 30 | import omq.exception.SerializerException; |
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| 31 | import omq.exception.TimeoutException; |
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| 32 | |
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| 33 | import com.rabbitmq.client.AMQP.BasicProperties; |
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| 34 | |
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| 35 | /** |
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| 36 | * EvoProxy class. This class inherits from InvocationHandler and gives you a |
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| 37 | * proxy with a server using an environment |
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| 38 | * |
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| 39 | * @author Sergi Toda <sergi.toda@estudiants.urv.cat> |
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| 40 | * |
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| 41 | */ |
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| 42 | public class Proxymq implements InvocationHandler, Remote { |
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| 43 | |
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| 44 | /** |
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| 45 | * |
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| 46 | */ |
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| 47 | private static final long serialVersionUID = 1L; |
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[49] | 48 | private static final Logger logger = Logger.getLogger(Proxymq.class.getName()); |
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[44] | 49 | private static Map<String, Object> proxies = new Hashtable<String, Object>(); |
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| 50 | |
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| 51 | private String uid; |
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[47] | 52 | private transient String serializerType; |
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[44] | 53 | private transient ResponseListener rListener; |
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| 54 | private transient EventDispatcher dispatcher; |
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| 55 | // private transient Channel channel; |
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| 56 | private transient Properties env; |
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| 57 | private transient Map<String, byte[]> results; |
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| 58 | private transient Map<String, EventListener<?>> listeners; |
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| 59 | |
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| 60 | private static final Map<String, Class<?>> primitiveClasses = new HashMap<String, Class<?>>(); |
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| 61 | static { |
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| 62 | primitiveClasses.put("byte", Byte.class); |
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| 63 | primitiveClasses.put("short", Short.class); |
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| 64 | primitiveClasses.put("char", Character.class); |
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| 65 | primitiveClasses.put("int", Integer.class); |
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| 66 | primitiveClasses.put("long", Long.class); |
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| 67 | primitiveClasses.put("float", Float.class); |
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| 68 | primitiveClasses.put("double", Double.class); |
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| 69 | } |
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| 70 | |
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| 71 | /** |
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| 72 | * EvoProxy Constructor. |
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| 73 | * |
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| 74 | * This constructor uses an uid to know which object will call. It also uses |
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| 75 | * Properties to set where to send the messages |
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| 76 | * |
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| 77 | * @param uid |
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| 78 | * The uid represents the unique identifier of a remote object |
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| 79 | * @param clazz |
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| 80 | * It represents the real class of the remote object. With this |
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| 81 | * class the system can know the remoteInterface used and it can |
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| 82 | * also see which annotations are used |
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| 83 | * @param env |
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| 84 | * The environment is used to know where to send the messages |
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| 85 | * @throws Exception |
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| 86 | */ |
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| 87 | public Proxymq(String uid, Class<?> clazz, Properties env) throws Exception { |
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| 88 | this.uid = uid; |
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| 89 | this.rListener = ResponseListener.getRequestListener(); |
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| 90 | this.dispatcher = EventDispatcher.getDispatcher(); |
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| 91 | |
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| 92 | // TODO what is better to use a new channel or to use the same? |
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| 93 | // this.channel = Broker.getChannel(); |
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| 94 | this.env = env; |
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| 95 | |
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[47] | 96 | // set the serializer type |
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| 97 | serializerType = env.getProperty(ParameterQueue.SERIALIZER_NAME, Serializer.java); |
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| 98 | |
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[44] | 99 | listeners = new HashMap<String, EventListener<?>>(); |
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| 100 | |
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| 101 | // Create a new hashmap and registry it in rListener |
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| 102 | results = new HashMap<String, byte[]>(); |
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| 103 | rListener.registerProxy(this); |
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| 104 | } |
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| 105 | |
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| 106 | @Override |
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| 107 | public Object invoke(Object proxy, Method method, Object[] arguments) throws Throwable { |
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| 108 | // long timeStart = (new Date()).getTime(); |
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| 109 | |
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| 110 | // Local methods only |
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| 111 | String methodName = method.getName(); |
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| 112 | |
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| 113 | // The local methods will be invoked here |
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| 114 | if (method.getDeclaringClass().equals(Remote.class)) { |
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| 115 | if (methodName.equals("getRef")) { |
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| 116 | return getRef(); |
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| 117 | } else if (methodName.equals("addListener")) { |
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| 118 | addListener((EventListener<?>) arguments[0]); |
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| 119 | return null; |
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| 120 | } else if (methodName.equals("removeListener")) { |
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| 121 | removeListener((EventListener<?>) arguments[0]); |
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| 122 | return null; |
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| 123 | } else if (methodName.equals("getListeners")) { |
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| 124 | return getListeners(); |
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| 125 | } |
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| 126 | } |
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| 127 | |
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| 128 | // Create the request |
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| 129 | Request request = createRequest(method, arguments); |
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| 130 | |
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| 131 | // Log.saveTimeSendRequestLog("Client-time-request", request.getId(), |
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| 132 | // method.getName(), timeStart); |
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| 133 | |
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| 134 | Object response = null; |
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| 135 | // Publish the request |
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| 136 | if (request.isAsync()) { |
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[49] | 137 | logger.debug("Publish async request -> " + request.getId()); |
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[44] | 138 | publishAsyncRequest(request); |
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| 139 | } else { |
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[49] | 140 | logger.debug("Publish sync request -> " + request.getId()); |
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[44] | 141 | response = publishSyncRequest(request, method.getReturnType()); |
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| 142 | |
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| 143 | // long timeEnd = (new Date()).getTime(); |
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| 144 | // Log.saveTimeSendRequestLog("Client-time-response", |
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| 145 | // request.getId(), method.getName(), timeEnd); |
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| 146 | } |
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| 147 | |
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| 148 | return response; |
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| 149 | } |
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| 150 | |
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| 151 | private void publishMessage(Request request, String replyQueueName) throws Exception { |
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| 152 | String corrId = request.getId(); |
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| 153 | |
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| 154 | // Get the environment properties |
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| 155 | String exchange = env.getProperty(ParameterQueue.RPC_EXCHANGE); |
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| 156 | String routingkey = this.uid; |
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| 157 | |
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| 158 | // Add the correlation ID and create a replyTo property |
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[47] | 159 | BasicProperties props = new BasicProperties.Builder().appId(uid).correlationId(corrId).replyTo(replyQueueName).type(serializerType).build(); |
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[44] | 160 | |
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| 161 | // Publish the message |
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[47] | 162 | byte[] bytesRequest = Serializer.serialize(serializerType, request); |
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[44] | 163 | // TODO See this |
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| 164 | // channel.basicPublish(exchange, routingkey, props, bytesRequest); |
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| 165 | Broker.getChannel().basicPublish(exchange, routingkey, props, bytesRequest); |
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| 166 | // Log.saveLog("Client-Serialize", bytesRequest); |
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| 167 | } |
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| 168 | |
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| 169 | private void publishAsyncRequest(Request request) throws Exception { |
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| 170 | // Get the environment properties |
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| 171 | String replyQueueName = env.getProperty(ParameterQueue.RPC_REPLY_QUEUE); |
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| 172 | publishMessage(request, replyQueueName); |
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| 173 | } |
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| 174 | |
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| 175 | private Object publishSyncRequest(Request request, Class<?> type) throws Exception { |
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| 176 | String corrId = request.getId(); |
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| 177 | |
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| 178 | int retries = request.getRetries(); |
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| 179 | long timeout = request.getTimeout(); |
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| 180 | |
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| 181 | // Get the environment properties |
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| 182 | String replyQueueName = env.getProperty(ParameterQueue.RPC_REPLY_QUEUE); |
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| 183 | |
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| 184 | // Publish the message |
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| 185 | int i = 0; |
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| 186 | while (i < retries) { |
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| 187 | try { |
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| 188 | publishMessage(request, replyQueueName); |
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| 189 | return getResult(corrId, timeout, type); |
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| 190 | } catch (TimeoutException te) { |
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[49] | 191 | logger.error(te); |
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[44] | 192 | } |
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| 193 | i++; |
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| 194 | } |
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| 195 | throw new RetryException(retries, timeout); |
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| 196 | } |
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| 197 | |
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| 198 | private Request createRequest(Method method, Object[] arguments) { |
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| 199 | String corrId = java.util.UUID.randomUUID().toString(); |
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| 200 | String methodName = method.getName(); |
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| 201 | |
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| 202 | // Since we need to know whether the method is async and if it has to |
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| 203 | // return using an annotation, we'll only check the AsyncMethod |
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| 204 | // annotation |
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| 205 | if (method.getAnnotation(AsyncMethod.class) == null) { |
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| 206 | int retries = 1; |
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| 207 | long timeout = ParameterQueue.DEFAULT_TIMEOUT; |
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| 208 | if (method.getAnnotation(SyncMethod.class) != null) { |
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| 209 | SyncMethod sync = method.getAnnotation(SyncMethod.class); |
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| 210 | retries = sync.retry(); |
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| 211 | timeout = sync.timeout(); |
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| 212 | } |
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| 213 | return Request.newSyncRequest(corrId, methodName, arguments, retries, timeout); |
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| 214 | } else { |
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| 215 | return Request.newAsyncRequest(corrId, methodName, arguments); |
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| 216 | } |
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| 217 | } |
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| 218 | |
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| 219 | private Object getResult(String corrId, long timeout, Class<?> type) throws Exception { |
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| 220 | Response resp = null; |
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| 221 | |
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| 222 | // Wait for the results. |
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| 223 | long localTimeout = 0; |
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| 224 | long start = System.currentTimeMillis(); |
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| 225 | synchronized (results) { |
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| 226 | // Due to we are using notifyAll(), we need to control the real time |
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| 227 | while (!results.containsKey(corrId) && (timeout - localTimeout) >= 0) { |
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| 228 | results.wait(timeout); |
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| 229 | localTimeout = System.currentTimeMillis() - start; |
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| 230 | } |
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| 231 | if ((timeout - localTimeout) <= 0) { |
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| 232 | throw new TimeoutException("Timeout exception time: " + timeout); |
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| 233 | } |
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| 234 | resp = Serializer.deserializeResponse(results.get(corrId), type); |
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| 235 | // Log.saveLog("Client-Deserialize", results.get(corrId)); |
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| 236 | |
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| 237 | // Remove and indicate the key exists (a hashmap can contain a null |
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| 238 | // object, using this we'll know whether a response has been |
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| 239 | // received before) |
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| 240 | results.put(corrId, null); |
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| 241 | } |
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| 242 | |
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| 243 | if (resp.getError() != null) { |
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| 244 | OmqException error = resp.getError(); |
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| 245 | String name = error.getType(); |
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| 246 | String message = error.getMessage(); |
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| 247 | throw (Exception) Class.forName(name).getConstructor(String.class).newInstance(message); |
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| 248 | } |
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| 249 | |
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| 250 | return resp.getResult(); |
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| 251 | } |
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| 252 | |
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| 253 | /** |
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| 254 | * |
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| 255 | * @param reference |
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| 256 | * RemoteObject reference |
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| 257 | * @return true if the proxy has been created before or false in the other |
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| 258 | * case |
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| 259 | */ |
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| 260 | public static boolean containsProxy(String reference) { |
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| 261 | return proxies.containsKey(reference); |
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| 262 | } |
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| 263 | |
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| 264 | /** |
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| 265 | * |
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| 266 | * @param reference |
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| 267 | * RemoteObject reference |
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| 268 | * @return a proxy instance |
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| 269 | * @throws NoContainsInstanceException |
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| 270 | */ |
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| 271 | public static Object getInstance(String reference) throws NoContainsInstanceException { |
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| 272 | if (!containsProxy(reference)) { |
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| 273 | throw new NoContainsInstanceException(reference); |
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| 274 | } |
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| 275 | return proxies.get(reference); |
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| 276 | } |
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| 277 | |
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| 278 | /** |
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| 279 | * Returns an instance of a proxy class for the specified interfaces that |
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| 280 | * dispatches method invocations to the specified invocation handler. * @param |
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| 281 | * loader |
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| 282 | * |
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| 283 | * @param loader |
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| 284 | * the class loader to define the proxy class |
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| 285 | * |
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| 286 | * @param interfaces |
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| 287 | * the list of interfaces for the proxy class to implement |
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| 288 | * @param proxy |
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| 289 | * the invocation handler to dispatch method invocations to |
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| 290 | * @return a proxy instance with the specified invocation handler of a proxy |
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| 291 | * class that is defined by the specified class loader and that |
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| 292 | * implements the specified interfaces |
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| 293 | */ |
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| 294 | public static Object newProxyInstance(ClassLoader loader, Class<?>[] interfaces, Proxymq proxy) { |
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| 295 | if (proxies.containsKey(proxy.getRef())) { |
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| 296 | return proxies.get(proxy.getRef()); |
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| 297 | } |
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| 298 | Object value = Proxy.newProxyInstance(loader, interfaces, proxy); |
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| 299 | proxies.put(proxy.getRef(), value); |
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| 300 | return value; |
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| 301 | } |
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| 302 | |
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| 303 | /** |
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| 304 | * Gets the Map used internally to retreive the response of the server |
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| 305 | * |
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| 306 | * @return a map with all the keys processed. Every key is a correlation id |
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| 307 | * of a method invoked remotely |
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| 308 | */ |
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| 309 | public Map<String, byte[]> getResults() { |
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| 310 | return results; |
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| 311 | } |
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| 312 | |
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[47] | 313 | public static void stopProxy() { |
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| 314 | proxies = new HashMap<String, Object>(); |
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| 315 | } |
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| 316 | |
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| 317 | public static Map<String, Object> getProxies() { |
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| 318 | return proxies; |
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| 319 | } |
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| 320 | |
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| 321 | public static void setProxies(Map<String, Object> proxies) { |
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| 322 | Proxymq.proxies = proxies; |
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| 323 | } |
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| 324 | |
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[44] | 325 | @Override |
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| 326 | public String getRef() { |
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| 327 | return uid; |
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| 328 | } |
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| 329 | |
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| 330 | @Override |
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| 331 | public void notifyEvent(Event event) throws IOException, SerializerException { |
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| 332 | } |
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| 333 | |
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| 334 | @Override |
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| 335 | public void addListener(EventListener<?> eventListener) throws Exception { |
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| 336 | if (eventListener.getTopic() == null) { |
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| 337 | eventListener.setTopic(uid); |
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| 338 | } |
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| 339 | listeners.put(eventListener.getTopic(), eventListener); |
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| 340 | dispatcher.addListener(eventListener); |
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| 341 | } |
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| 342 | |
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| 343 | @Override |
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| 344 | public void removeListener(EventListener<?> eventListener) throws Exception { |
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| 345 | listeners.remove(eventListener.getTopic()); |
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| 346 | dispatcher.removeListener(eventListener); |
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| 347 | } |
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| 348 | |
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| 349 | @Override |
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| 350 | public Collection<EventListener<?>> getListeners() throws Exception { |
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| 351 | return listeners.values(); |
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| 352 | } |
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| 353 | |
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| 354 | } |
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