Backend API. Server-side code: this runs in a Codename One backend, not in the app on the device.

public final class AsyncResult<V>

Object
AsyncResult

A Future that is already complete: what an @Async method returns from its body.

@Async
  public Future build(String month) {
      return AsyncResult.of(compute(month));
  }

The caller never sees this object. It receives the Future of the call itself at once, which completes with this value when the body has run – the same arrangement as Spring’s AsyncResult and CompletableFuture.completedFuture.

Methods

`public static <V>` `AsyncResult<V> of(V value)`	A result holding `value`.
`public static <V>` `AsyncResult<V> failed(Throwable failure)`	A result that failed with `failure`, for a body that reports rather than throws.
`public boolean cancel(boolean mayInterruptIfRunning)`	Stops the work if it has not started.
`public boolean isCancelled()`	Whether `cancel` cancelled the work before it ran.
`public boolean isDone()`	Whether the work has finished: completed, failed or cancelled.
`public V get() throwsExecutionException`	Waits for the work to finish and returns its result.
`public V get(long timeout,` `TimeUnit unit) throws ExecutionException`	Waits up to `timeout` for the work to finish and returns its result.

Inherited methods

From Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait, clone, finalize

Method details

of

public static <V> AsyncResult<V> of(V value)

A result holding value.

failed

public static <V> AsyncResult<V> failed(Throwable failure)

A result that failed with failure, for a body that reports rather than throws.

cancel

public boolean cancel(boolean mayInterruptIfRunning)

Stops the work if it has not started. Answers whether it was cancelled; work already running is not interrupted by the backend’s executors.

Parameters

mayInterruptIfRunning boolean: whether a running task may be interrupted

Returns

true when this call cancelled it

isCancelled

public boolean isCancelled()

Whether cancel cancelled the work before it ran.

Returns

true when cancelled

isDone

public boolean isDone()

Whether the work has finished: completed, failed or cancelled.

Returns

true once it will not change again

get

public V get()
throws ExecutionException

Waits for the work to finish and returns its result.

Returns

the result

Throws

InterruptedException: when the waiting thread is interrupted
ExecutionException: when the work threw; Throwable.getCause is what it threw
CancellationException: when the work was cancelled

get

public V get(long timeout, TimeUnit unit)
throws ExecutionException

Waits up to timeout for the work to finish and returns its result.

Parameters

timeout long: how long to wait, in unit
unit TimeUnit: the unit of timeout

Returns

the result

Throws

InterruptedException: when the waiting thread is interrupted
ExecutionException: when the work threw
TimeoutException: when it has not finished in time
CancellationException: when the work was cancelled