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Synchronization on an object retrieved via reflection


Synchronization on an object retrieved via reflection

By : Ruben Pavão
Date : November 22 2020, 01:01 AM
help you fix your problem There are some caveats, but the answer is "yes". An object is an object, no matter how you get the reference. If you synchronize on the reference, you are using the same lock as everyone else that synchronizes on the reference.
The most important caveat is that you must be sure it is a reference to the same object. I just glanced at the code in Xposed (cute stuff, btw; will probably fail >= 5.0) and I don't see objects being marshalled/unmarshalled, so it all looks good. If the object on which you are synchronizing is, for instance, Parcelable or a Binder watch out, because there are likely to be several copies of the "same" object.
code :


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Is it possible to cast a retrieved Class object (via reflection) to an interface?

Is it possible to cast a retrieved Class object (via reflection) to an interface?


By : rock dilan
Date : March 29 2020, 07:55 AM
I hope this helps . Because you are doing all of this dynamic loading at run time there is no construction of a virtual method table and its associated vpointers. Therefore there no way for the runtime to dynamically dispatch calls to the interface methods to the appropriately loaded implementation. You have to use reflection.
Convert via reflection retrieved object to string (how to iterate over multiple class types?)

Convert via reflection retrieved object to string (how to iterate over multiple class types?)


By : tinajean
Date : March 29 2020, 07:55 AM
seems to work fine Because of the hierarchic character and inheritance some verbosity will remain.
Object oriented would be a map.
code :
Class<?> clazz = getterMethod.getReturnType();
Map<Class<?>, Function<Object, String>> map;

Function<Object, String> converter;
do {
     converter = map.get(clazz);
     clazz = clazz.getSuperclass();
} while (converter == null && clazz != null;

String asText = converter == null
    ? String.valueOf(value)
    : converter.apply(value);
Is it possible to subclass a retrieved class via Java reflection

Is it possible to subclass a retrieved class via Java reflection


By : Christian Roy
Date : March 29 2020, 07:55 AM
around this issue It is not clear in your question to what extend it is a must that you need to use reflection for this. Because you could create your instance via reflection and then simply wrap it into your on proxy or decorator to enhance or change its behavior.
code :
class MyFactory {
    MyClass create() {
       return MyDecorator(cls.newInstance());
    }
}
OrderService subject = new DefaultOrderService();
OrderService orderService = (OrderService) Proxy.newProxyInstance(
         this.getClass().getClassLoader(),
            new Class<?>[]{OrderService.class},
            (proxy, method, args) -> {
                try {
                    System.out.println("Before method");
                    return method.invoke(subject, args);
                }
                finally {
                    System.out.println("After method");
                }
            }
        );
System.out.println(orderService.getClass());
orderService.getOrder(10);
DefaultOrderService subject = new DefaultOrderService();
Enhancer enhancer = new Enhancer();
enhancer.setSuperclass(DefaultOrderService.class);
enhancer.setCallback((InvocationHandler) (obj, method, args) -> {
   try {
      System.out.println("Before method");
      return method.invoke(subject, args);
   } 
   finally {
      System.out.println("After method");
   }
});

OrderService orderService = (OrderService) enhancer.create();
System.out.println(orderService.getClass());
orderService.getOrder(10);
Enum failing == when value retrieved via reflection

Enum failing == when value retrieved via reflection


By : wangkun 王
Date : March 29 2020, 07:55 AM
will help you Don't use == to evaluate equality for things that aren't strongly typed. Consider the following:
code :
void Main()
{
    Console.WriteLine(((object)Result.Pass) == (object)Result.Pass);
    // False

    Console.WriteLine(((object)Result.Pass).Equals((object)Result.Pass));
    // True

    Console.WriteLine(object.Equals((object)Result.Pass,(object)Result.Pass));
    // True
}

public enum Result{
    Pass, Fail
}
How to get List<int> from System.Object retrieved by reflection?

How to get List<int> from System.Object retrieved by reflection?


By : user3311607
Date : March 29 2020, 07:55 AM
Does that help As suggested by @John, here is re-write: , You can try this:
code :
public object Foo(object original)
{
  if ( original is System.Collections.IEnumerable )
  {
    List<object> copy = new List<object>();

    foreach ( var item in original as System.Collections.IEnumerable )
      copy.Add(item);

    return copy;
  }
  else
    return null;
}
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