/**
* Loads configuration. It verifies the constraints defined in {@link WireByMethod}.
*
* @param prefix the configuration prefix for this class
*/
public WireByMethod(String prefix) {
super(prefix);
// get the method
try {
final Class wire =
Configuration.getClass(
prefix + "." + PAR_CLASS, Class.forName("peersim.graph.GraphFactory"));
method =
WireByMethod.getMethod(wire, Configuration.getString(prefix + "." + PAR_METHOD, "wire"));
} catch (Exception e) {
throw new RuntimeException(e);
}
// set the constant args (those other than 0th)
Class[] argt = method.getParameterTypes();
args = new Object[argt.length];
for (int i = 1; i < args.length; ++i) {
if (argt[i] == int.class) args[i] = Configuration.getInt(prefix + "." + PAR_ARG + i);
else if (argt[i] == long.class) args[i] = Configuration.getLong(prefix + "." + PAR_ARG + i);
else if (argt[i] == double.class)
args[i] = Configuration.getDouble(prefix + "." + PAR_ARG + i);
else if (i == args.length - 1 && argt[i].isInstance(CommonState.r)) args[i] = CommonState.r;
else {
// we should neve get here
throw new RuntimeException(
"Unexpected error, please " + "report this problem to the peersim team");
}
}
}
/** Invokes the method passing g to it. */
public void wire(Graph g) {
args[0] = g;
try {
method.invoke(null, args);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* Search a wiring method in the specified class.
*
* @param cl the class where to find the method
* @param methodName the method to be searched
* @return the requested method, if it fully conforms to the definition of the wiring methods.
*/
private static Method getMethod(Class cl, String methodName)
throws NoSuchMethodException, ClassNotFoundException {
// Search methods
Method[] methods = cl.getMethods();
ArrayList<Method> list = new ArrayList<Method>();
for (Method m : methods) {
if (m.getName().equals(methodName)) {
list.add(m);
}
}
if (list.size() == 0) {
throw new NoSuchMethodException(
"No method " + methodName + " in class " + cl.getSimpleName());
} else if (list.size() > 1) {
throw new NoSuchMethodException(
"Multiple methods called " + methodName + " in class " + cl.getSimpleName());
}
// Found a single method with the right name; check if
// it is a setter.
final Class graphClass = Class.forName("peersim.graph.Graph");
final Class randomClass = Class.forName("java.util.Random");
Method method = list.get(0);
Class[] pars = method.getParameterTypes();
if (pars.length < 1 || !pars[0].isAssignableFrom(graphClass))
throw new NoSuchMethodException(
method.getName()
+ " of class "
+ cl.getSimpleName()
+ " is not a valid graph wiring method,"
+ " it has to have peersim.graph.Graph as first argument type");
for (int i = 1; i < pars.length; ++i)
if (!(pars[i] == int.class
|| pars[i] == long.class
|| pars[i] == double.class
|| (i == pars.length - 1 && pars[i].isAssignableFrom(randomClass))))
throw new NoSuchMethodException(
method.getName()
+ " of class "
+ cl.getSimpleName()
+ " is not a valid graph wiring method");
if (method.toString().indexOf("static") < 0)
throw new NoSuchMethodException(
method.getName()
+ " of class "
+ cl.getSimpleName()
+ " is not a valid graph wiring method; it is not static");
return method;
}