default Governor findGovernor(String currentMethod, Method m) {
Governor governor = new NullMaskingGovernor();
try {
m = this.getClass().getMethod(currentMethod, new Class[] {});
Governed governed = m.getAnnotation(Governed.class);
if (governed != null) {
Governor fromValue = m.getAnnotation(Governed.class).value().strategy;
Governor fromGovernor = m.getAnnotation(Governed.class).governor().newInstance();
if (fromGovernor.getClass() != fromValue.getClass()) {
log.debug("Using specified Governor: {}", fromGovernor.getClass().getName());
governor = fromGovernor;
} else {
log.debug("User default Governor: " + fromValue.getClass().getName());
governor = fromValue;
}
}
} catch (NoSuchMethodException
| SecurityException
| InstantiationException
| IllegalAccessException e) {
log.error("Error governing method: {}. Returning null just to be safe.", m.getName(), e);
}
return governor;
}
/**
* Attempts to applied the specified or default {@link Governor} to the incoming object. The
* return type of the {@link Governor} should be the same as the {@code type} parameter or at
* least be cast-able to that type.
*
* @param o - this incoming value to govern
* @param type - the type to which the return value is cast
* @return
*/
default <T extends Object> T govern(Object o, Class<T> type) {
String currentMethod = Thread.currentThread().getStackTrace()[2].getMethodName();
Method m = null;
Governor governor = (findGovernor(currentMethod, m));
return type.cast(governor.govern(o));
}
