In Java, how to check that AutoCloseable.close() has been called?

Question

I am authoring a java library. Some of the classes that are meant to be used by library users, hold native system resources (over JNI). I\'d like to ensure that the user \"dispo

Answer 1

i would provide instances to those objects through Factory methods and with that i have control over the creation of them, and i will feed the consumers with Proxies that does the logic of closing the object

interface Service {
 T execute();
 void close();
}

class HeavyObject implements Service {
  SomeObject execute() {
  // .. some logic here
  }
  private HeavyObject() {}

  public static HeavyObject create() {
   return new HeavyObjectProxy(new HeavyObject());
  }

  public void close() {
   // .. the closing logic here
  }
}

class HeavyObjectProxy extends HeavyObject {

  public SomeObject execute() {
    SomeObject value = super.execute();
    super.close();
    return value;
  }
}