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.HashMap; |
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7 | import java.util.List; |
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8 | import java.util.Map; |
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9 | import java.util.Properties; |
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10 | |
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11 | import omq.Remote; |
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12 | import omq.common.broker.Broker; |
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13 | import omq.common.util.ParameterQueue; |
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14 | |
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15 | import org.apache.log4j.Logger; |
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16 | |
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17 | /** |
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18 | * A RemoteObject when it's started will be waiting for requests and will invoke |
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19 | * them. When a RemoteObject is started it listens two queues, the first one has |
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20 | * the same name as its reference and the second one is its multiqueue -this |
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21 | * name can be set using a property, be aware to use a name not used by another |
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22 | * object!!!-. |
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23 | * |
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24 | * @author Sergi Toda <sergi.toda@estudiants.urv.cat> |
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25 | * |
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26 | */ |
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27 | public abstract class RemoteObject implements Remote { |
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28 | |
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29 | private static final long serialVersionUID = -1778953938739846450L; |
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30 | private static final Logger logger = Logger.getLogger(RemoteObject.class.getName()); |
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31 | |
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32 | private String UID; |
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33 | private Properties env; |
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34 | private transient Broker broker; |
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35 | private transient Map<String, List<Class<?>>> params; |
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36 | private transient List<InvocationThread> invocationList; |
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37 | |
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38 | private static final Map<String, Class<?>> primitiveClasses = new HashMap<String, Class<?>>(); |
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39 | |
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40 | static { |
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41 | primitiveClasses.put("byte", Byte.class); |
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42 | primitiveClasses.put("short", Short.class); |
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43 | primitiveClasses.put("char", Character.class); |
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44 | primitiveClasses.put("int", Integer.class); |
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45 | primitiveClasses.put("long", Long.class); |
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46 | primitiveClasses.put("float", Float.class); |
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47 | primitiveClasses.put("double", Double.class); |
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48 | } |
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49 | |
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50 | /** |
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51 | * This method starts a remoteObject. |
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52 | * |
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53 | * @param reference |
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54 | * - broker's binding referece |
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55 | * @param broker |
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56 | * - broker that binds this remoteObject |
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57 | * @param env |
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58 | * - properties of this remoteObject |
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59 | * @throws Exception |
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60 | */ |
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61 | public void startRemoteObject(String reference, Broker broker, Properties env) throws Exception { |
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62 | this.broker = broker; |
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63 | this.UID = reference; |
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64 | this.env = env; |
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65 | |
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66 | this.params = new HashMap<String, List<Class<?>>>(); |
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67 | for (Method m : this.getClass().getMethods()) { |
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68 | List<Class<?>> list = new ArrayList<Class<?>>(); |
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69 | for (Class<?> clazz : m.getParameterTypes()) { |
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70 | list.add(clazz); |
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71 | } |
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72 | this.params.put(m.getName(), list); |
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73 | } |
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74 | |
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75 | // Get num threads to use |
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76 | int numThreads = Integer.parseInt(env.getProperty(ParameterQueue.NUM_THREADS, "1")); |
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77 | invocationList = new ArrayList<InvocationThread>(numThreads); |
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78 | |
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79 | // Start invocation threads |
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80 | for (int i = 0; i < numThreads; i++) { |
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81 | InvocationThread iThread = new InvocationThread(this, broker); |
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82 | invocationList.add(iThread); |
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83 | iThread.start(); |
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84 | } |
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85 | |
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86 | } |
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87 | |
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88 | @Override |
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89 | public String getRef() { |
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90 | return UID; |
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91 | } |
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92 | |
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93 | /** |
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94 | * This method kills all the threads waiting for requests |
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95 | * |
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96 | * @throws IOException |
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97 | * - If an operation failed. |
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98 | */ |
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99 | public void kill() throws IOException { |
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100 | logger.info("Killing objectmq: " + this.getRef()); |
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101 | for (InvocationThread iThread : invocationList) { |
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102 | iThread.kill(); |
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103 | } |
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104 | } |
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105 | |
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106 | /** |
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107 | * This method invokes the method specified by methodName and arguments |
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108 | * |
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109 | * @param methodName |
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110 | * @param arguments |
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111 | * @return result |
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112 | * @throws Exception |
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113 | */ |
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114 | public Object invokeMethod(String methodName, Object[] arguments) throws Exception { |
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115 | |
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116 | // Get the specific method identified by methodName and its arguments |
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117 | Method method = loadMethod(methodName, arguments); |
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118 | |
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119 | return method.invoke(this, arguments); |
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120 | } |
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121 | |
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122 | /** |
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123 | * This method loads the method specified by methodName and args |
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124 | * |
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125 | * @param methodName |
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126 | * @param args |
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127 | * @return method |
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128 | * @throws NoSuchMethodException |
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129 | * - If the method cannot be found |
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130 | */ |
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131 | private Method loadMethod(String methodName, Object[] args) throws NoSuchMethodException { |
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132 | Method m = null; |
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133 | |
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134 | // Obtain the class reference |
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135 | Class<?> clazz = this.getClass(); |
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136 | Class<?>[] argArray = null; |
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137 | |
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138 | if (args != null) { |
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139 | argArray = new Class<?>[args.length]; |
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140 | for (int i = 0; i < args.length; i++) { |
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141 | argArray[i] = args[i].getClass(); |
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142 | } |
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143 | } |
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144 | |
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145 | try { |
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146 | m = clazz.getMethod(methodName, argArray); |
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147 | } catch (NoSuchMethodException nsm) { |
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148 | m = loadMethodWithPrimitives(methodName, argArray); |
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149 | } |
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150 | return m; |
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151 | } |
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152 | |
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153 | /** |
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154 | * This method loads a method which uses primitives as arguments |
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155 | * |
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156 | * @param methodName |
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157 | * - name of the method wanted to invoke |
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158 | * @param argArray |
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159 | * - arguments |
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160 | * @return method |
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161 | * @throws NoSuchMethodException |
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162 | * - If the method cannot be found |
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163 | */ |
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164 | private Method loadMethodWithPrimitives(String methodName, Class<?>[] argArray) throws NoSuchMethodException { |
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165 | if (argArray != null) { |
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166 | Method[] methods = this.getClass().getMethods(); |
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167 | int length = argArray.length; |
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168 | |
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169 | for (Method method : methods) { |
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170 | String name = method.getName(); |
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171 | int argsLength = method.getParameterTypes().length; |
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172 | |
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173 | if (name.equals(methodName) && length == argsLength) { |
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174 | // This array can have primitive types inside |
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175 | Class<?>[] params = method.getParameterTypes(); |
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176 | |
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177 | boolean found = true; |
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178 | |
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179 | for (int i = 0; i < length; i++) { |
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180 | if (params[i].isPrimitive()) { |
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181 | Class<?> paramWrapper = primitiveClasses.get(params[i].getName()); |
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182 | |
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183 | if (!paramWrapper.equals(argArray[i])) { |
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184 | found = false; |
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185 | break; |
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186 | } |
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187 | } |
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188 | } |
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189 | if (found) { |
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190 | return method; |
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191 | } |
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192 | } |
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193 | } |
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194 | } |
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195 | throw new NoSuchMethodException(methodName); |
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196 | } |
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197 | |
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198 | public List<Class<?>> getParams(String methodName) { |
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199 | return params.get(methodName); |
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200 | } |
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201 | |
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202 | public Broker getBroker() { |
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203 | return broker; |
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204 | } |
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205 | |
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206 | public Properties getEnv() { |
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207 | return env; |
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208 | } |
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209 | |
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210 | } |
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