private Object getOrCreateController(MethodAction methodAction) {
Object controller = controllerInstances.get(methodAction.type());
if (controller == null) {
synchronized (controllerInstances) {
controller = controllerInstances.get(methodAction.type());
if (controller == null) {
controller = createController(methodAction);
controllerInstances.put(methodAction.type(), controller);
}
}
}
return controller;
}
@Override
public MethodAction createActionIfPossible(String actionName) {
// will resolve if both a class and method name can be parsed, and a valid class with that
// method name can be loaded
String methodName = MethodAction.methodNameForAction(actionName);
String className = MethodAction.classNameForAction(actionName);
if (StringUtils.isEmpty(methodName) || StringUtils.isEmpty(className)) {
return null;
}
try {
Class<?> clazz = Class.forName(className); // TODO - Restricted in GAE - why is this better?
// ClassLoaderUtil.loadClass(className);
Method method = ReflectUtil.findMethod(clazz, methodName);
if (method == null) {
return null;
}
MethodAction methodAction = new MethodAction(clazz, method, findInterceptors(method));
// force instantiation of controller - this allows controllers to be injected into eachother
// and also flushes out instantiation issues at startup
Object controller = createController(methodAction);
controllerInstances.put(methodAction.type(), controller);
return methodAction;
} catch (BaseException e) {
throw e;
} catch (Exception e) {
return null;
}
}
<T> T createController(MethodAction actionMethod) {
Class<T> type = actionMethod.type();
if (!injectionContext.contains(type)) {
injectionContext.inject(type).as(type);
}
try {
return injectionContext.get(type);
} catch (Exception e) {
throw new ActionException(
e, "Failed to create controller %s: %s", type.toString(), e.getMessage());
}
}