T
- the type of the value wrapped by this classstatic final class ConcurrentUtils.ConstantFuture<T>
extends java.lang.Object
implements java.util.concurrent.Future<T>
Future
implementation which wraps a constant value.Constructor and Description |
---|
ConstantFuture(T value)
Creates a new instance of
ConstantFuture and initializes it
with the constant value. |
Modifier and Type | Method and Description |
---|---|
boolean |
cancel(boolean mayInterruptIfRunning)
The cancel operation is not supported.
|
T |
get()
This implementation just returns the constant value.
|
T |
get(long timeout,
java.util.concurrent.TimeUnit unit)
This implementation just returns the constant value; it
does not block, therefore the timeout has no meaning.
|
boolean |
isCancelled()
This implementation always returns false; there
is no background process which could be cancelled.
|
boolean |
isDone()
This implementation always returns true because
the constant object managed by this
Future implementation is
always available. |
private final T value
ConstantFuture(T value)
ConstantFuture
and initializes it
with the constant value.value
- the value (may be null)public boolean isDone()
Future
implementation is
always available.isDone
in interface java.util.concurrent.Future<T>
public T get()
get
in interface java.util.concurrent.Future<T>
public T get(long timeout, java.util.concurrent.TimeUnit unit)
get
in interface java.util.concurrent.Future<T>
public boolean isCancelled()
isCancelled
in interface java.util.concurrent.Future<T>
public boolean cancel(boolean mayInterruptIfRunning)
cancel
in interface java.util.concurrent.Future<T>