1 | package omq.client.proxy; |
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2 | |
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3 | import java.lang.reflect.Array; |
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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.util.HashMap; |
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7 | import java.util.Map; |
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8 | import java.util.Properties; |
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9 | |
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10 | import omq.Remote; |
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11 | import omq.client.annotation.AsyncMethod; |
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12 | import omq.client.annotation.MultiMethod; |
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13 | import omq.client.annotation.SyncMethod; |
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14 | import omq.client.listener.ResponseListener; |
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15 | import omq.common.broker.Broker; |
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16 | import omq.common.message.Request; |
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17 | import omq.common.message.Response; |
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18 | import omq.common.util.ParameterQueue; |
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19 | import omq.common.util.Serializer; |
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20 | import omq.exception.OmqException; |
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21 | import omq.exception.RetryException; |
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22 | import omq.exception.TimeoutException; |
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23 | |
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24 | import org.apache.log4j.Logger; |
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25 | |
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26 | import com.rabbitmq.client.AMQP.BasicProperties; |
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27 | |
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28 | /** |
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29 | * EvoProxy class. This class inherits from InvocationHandler and gives you a |
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30 | * proxy with a server using an environment |
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31 | * |
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32 | * @author Sergi Toda <sergi.toda@estudiants.urv.cat> |
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33 | * |
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34 | */ |
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35 | public class Proxymq implements InvocationHandler, Remote { |
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36 | |
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37 | /** |
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38 | * |
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39 | */ |
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40 | private static final long serialVersionUID = 1L; |
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41 | private static final Logger logger = Logger.getLogger(Proxymq.class.getName()); |
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42 | private static final String multi = "multi#"; |
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43 | |
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44 | private String uid; |
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45 | private transient String exchange; |
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46 | private transient String multiExchange; |
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47 | private transient String replyQueueName; |
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48 | private transient String serializerType; |
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49 | private transient Broker broker; |
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50 | private transient ResponseListener rListener; |
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51 | private transient Serializer serializer; |
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52 | private transient Properties env; |
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53 | private transient Map<String, byte[]> results; |
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54 | |
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55 | private static final Map<String, Class<?>> primitiveClasses = new HashMap<String, Class<?>>(); |
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56 | static { |
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57 | primitiveClasses.put("byte", Byte.class); |
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58 | primitiveClasses.put("short", Short.class); |
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59 | primitiveClasses.put("char", Character.class); |
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60 | primitiveClasses.put("int", Integer.class); |
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61 | primitiveClasses.put("long", Long.class); |
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62 | primitiveClasses.put("float", Float.class); |
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63 | primitiveClasses.put("double", Double.class); |
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64 | } |
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65 | |
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66 | /** |
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67 | * EvoProxy Constructor. |
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68 | * |
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69 | * This constructor uses an uid to know which object will call. It also uses |
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70 | * Properties to set where to send the messages |
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71 | * |
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72 | * @param uid |
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73 | * The uid represents the unique identifier of a remote object |
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74 | * @param clazz |
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75 | * It represents the real class of the remote object. With this |
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76 | * class the system can know the remoteInterface used and it can |
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77 | * also see which annotations are used |
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78 | * @param env |
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79 | * The environment is used to know where to send the messages |
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80 | * @throws Exception |
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81 | */ |
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82 | public Proxymq(String uid, Class<?> clazz, Broker broker) throws Exception { |
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83 | this.uid = uid; |
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84 | this.broker = broker; |
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85 | rListener = broker.getResponseListener(); |
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86 | serializer = broker.getSerializer(); |
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87 | |
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88 | // TODO what is better to use a new channel or to use the same? |
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89 | // this.channel = Broker.getChannel(); |
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90 | env = broker.getEnvironment(); |
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91 | exchange = env.getProperty(ParameterQueue.RPC_EXCHANGE); |
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92 | multiExchange = multi + exchange; |
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93 | replyQueueName = env.getProperty(ParameterQueue.RPC_REPLY_QUEUE); |
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94 | |
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95 | // set the serializer type |
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96 | serializerType = env.getProperty(ParameterQueue.SERIALIZER_NAME, Serializer.JAVA); |
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97 | |
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98 | // Create a new hashmap and registry it in rListener |
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99 | results = new HashMap<String, byte[]>(); |
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100 | rListener.registerProxy(this); |
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101 | } |
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102 | |
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103 | @Override |
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104 | public Object invoke(Object proxy, Method method, Object[] arguments) throws Throwable { |
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105 | // Local methods only |
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106 | String methodName = method.getName(); |
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107 | |
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108 | // The local methods will be invoked here |
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109 | if (method.getDeclaringClass().equals(Remote.class)) { |
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110 | if (methodName.equals("getRef")) { |
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111 | return getRef(); |
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112 | } |
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113 | } |
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114 | |
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115 | // Create the request |
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116 | Request request = createRequest(method, arguments); |
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117 | |
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118 | Object response = null; |
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119 | // Publish the request |
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120 | if (request.isAsync()) { |
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121 | logger.debug("Publish async request -> " + request.getId()); |
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122 | publishMessage(request, replyQueueName); |
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123 | } else { |
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124 | logger.debug("Publish sync request -> " + request.getId()); |
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125 | response = publishSyncRequest(request, method.getReturnType()); |
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126 | } |
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127 | |
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128 | return response; |
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129 | } |
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130 | |
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131 | private void publishMessage(Request request, String replyQueueName) throws Exception { |
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132 | String corrId = request.getId(); |
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133 | |
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134 | // Get the environment properties |
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135 | String exchange; |
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136 | String routingkey; |
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137 | |
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138 | if (request.isMulti()) { |
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139 | exchange = multiExchange; |
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140 | routingkey = ""; |
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141 | } else { |
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142 | exchange = this.exchange; |
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143 | routingkey = uid; |
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144 | } |
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145 | |
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146 | // Add the correlation ID and create a replyTo property |
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147 | BasicProperties props = new BasicProperties.Builder().appId(uid).correlationId(corrId).replyTo(replyQueueName).type(serializerType).build(); |
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148 | |
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149 | // Publish the message |
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150 | byte[] bytesRequest = serializer.serialize(serializerType, request); |
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151 | broker.getChannel().basicPublish(exchange, routingkey, props, bytesRequest); |
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152 | } |
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153 | |
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154 | private Object publishSyncRequest(Request request, Class<?> type) throws Exception { |
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155 | String corrId = request.getId(); |
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156 | |
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157 | int retries = request.getRetries(); |
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158 | long timeout = request.getTimeout(); |
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159 | |
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160 | // Publish the message |
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161 | int i = 0; |
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162 | while (i < retries) { |
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163 | try { |
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164 | publishMessage(request, replyQueueName); |
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165 | if (request.isMulti()) { |
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166 | return getResults(corrId, 2, timeout, type); |
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167 | } else { |
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168 | return getResult(corrId, timeout, type); |
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169 | } |
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170 | |
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171 | } catch (TimeoutException te) { |
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172 | logger.error(te); |
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173 | } |
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174 | i++; |
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175 | } |
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176 | throw new RetryException(retries, timeout); |
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177 | } |
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178 | |
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179 | private Request createRequest(Method method, Object[] arguments) { |
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180 | String corrId = java.util.UUID.randomUUID().toString(); |
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181 | String methodName = method.getName(); |
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182 | boolean multi = false; |
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183 | int wait = 0; |
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184 | |
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185 | if (method.getAnnotation(MultiMethod.class) != null) { |
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186 | multi = true; |
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187 | wait = method.getAnnotation(MultiMethod.class).waitNum(); |
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188 | } |
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189 | |
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190 | // Since we need to know whether the method is async and if it has to |
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191 | // return using an annotation, we'll only check the AsyncMethod |
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192 | // annotation |
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193 | if (method.getAnnotation(AsyncMethod.class) == null) { |
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194 | int retries = 1; |
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195 | long timeout = ParameterQueue.DEFAULT_TIMEOUT; |
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196 | if (method.getAnnotation(SyncMethod.class) != null) { |
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197 | SyncMethod sync = method.getAnnotation(SyncMethod.class); |
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198 | retries = sync.retry(); |
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199 | timeout = sync.timeout(); |
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200 | } |
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201 | return Request.newSyncRequest(corrId, methodName, arguments, retries, timeout, multi, wait); |
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202 | } else { |
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203 | return Request.newAsyncRequest(corrId, methodName, arguments, multi); |
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204 | } |
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205 | } |
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206 | |
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207 | private Object getResult(String corrId, long timeout, Class<?> type) throws Exception { |
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208 | Response resp = null; |
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209 | |
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210 | // Wait for the results. |
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211 | long localTimeout = timeout; |
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212 | long start = System.currentTimeMillis(); |
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213 | synchronized (results) { |
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214 | // Due to we are using notifyAll(), we need to control the real time |
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215 | while (!results.containsKey(corrId) && (timeout - localTimeout) >= 0) { |
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216 | results.wait(localTimeout); |
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217 | localTimeout = System.currentTimeMillis() - start; |
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218 | } |
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219 | if ((timeout - localTimeout) <= 0) { |
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220 | throw new TimeoutException("Timeout exception time: " + timeout); |
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221 | } |
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222 | resp = serializer.deserializeResponse(results.get(corrId), type); |
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223 | |
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224 | // Remove and indicate the key exists (a hashmap can contain a null |
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225 | // object, using this we'll know whether a response has been |
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226 | // received before) |
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227 | results.put(corrId, null); |
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228 | } |
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229 | |
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230 | if (resp.getError() != null) { |
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231 | OmqException error = resp.getError(); |
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232 | String name = error.getType(); |
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233 | String message = error.getMessage(); |
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234 | throw (Exception) Class.forName(name).getConstructor(String.class).newInstance(message); |
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235 | } |
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236 | |
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237 | return resp.getResult(); |
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238 | } |
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239 | |
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240 | private Object getResults(String corrId, int wait, long timeout, Class<?> type) throws Exception { |
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241 | Response resp = null; |
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242 | Class<?> actualType = type.getComponentType(); |
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243 | |
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244 | Object array = Array.newInstance(actualType, wait); |
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245 | |
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246 | int i = 0; |
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247 | long localTimeout = timeout; |
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248 | long start = System.currentTimeMillis(); |
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249 | |
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250 | while (i < wait) { |
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251 | synchronized (results) { |
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252 | // Due to we are using notifyAll(), we need to control the real |
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253 | // time |
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254 | while (!results.containsKey(corrId) && (timeout - localTimeout) >= 0) { |
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255 | results.wait(localTimeout); |
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256 | localTimeout = System.currentTimeMillis() - start; |
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257 | } |
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258 | if ((timeout - localTimeout) <= 0) { |
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259 | throw new TimeoutException("Timeout exception time: " + timeout); |
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260 | } |
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261 | // Remove the corrId to receive new replies |
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262 | resp = serializer.deserializeResponse(results.remove(corrId), actualType); |
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263 | Array.set(array, i, resp.getResult()); |
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264 | } |
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265 | i++; |
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266 | } |
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267 | synchronized (results) { |
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268 | results.put(corrId, null); |
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269 | } |
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270 | |
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271 | return array; |
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272 | } |
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273 | |
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274 | /** |
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275 | * Gets the Map used internally to retreive the response of the server |
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276 | * |
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277 | * @return a map with all the keys processed. Every key is a correlation id |
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278 | * of a method invoked remotely |
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279 | */ |
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280 | public Map<String, byte[]> getResults() { |
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281 | return results; |
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282 | } |
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283 | |
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284 | @Override |
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285 | public String getRef() { |
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286 | return uid; |
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287 | } |
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288 | |
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289 | } |
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