233. Chaining and rebinding scoped values

In this problem, you’ll see how to chain and rebind scoped values. These are very handy operations that you’ll love to use.

Changing scoped values

Let’s assume that we have three ScopedValue instances, as follows:

private static final ScopedValue<String> SCOPED_VALUE_1 
 = ScopedValue.newInstance();
private static final ScopedValue<String> SCOPED_VALUE_2 
 = ScopedValue.newInstance();
private static final ScopedValue<String> SCOPED_VALUE_3 
 = ScopedValue.newInstance();

We also have a Runnable that uses all three ScopedValue instances:

Runnable task = () -> {
  logger.info(Thread.currentThread().toString());
  logger.info(() -> SCOPED_VALUE_1.isBound() 
    ? SCOPED_VALUE_1.get() : "Not bound");
  logger.info(() -> SCOPED_VALUE_2.isBound() 
    ? SCOPED_VALUE_2.get() : "Not bound");
  logger.info(() -> SCOPED_VALUE_3.isBound() 
    ? SCOPED_VALUE_3...