本文整理了Java中com.englishtown.promises.Promise类的一些代码示例，展示了Promise类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Promise类的具体详情如下：
包路径：com.englishtown.promises.Promise
类名称：Promise

Promise介绍

[英]Promises/A+ implementation
[中]承诺/A+实施

代码示例

代码示例来源：origin: ef-labs/vertx-jersey

/**
   * {@inheritDoc}
   */
  @Override
  public void start(Future<Void> startedResult) throws Exception {

    jerseyServer.createServer()
        .then(server -> {
          startedResult.complete();
          return null;
        })
        .otherwise(t -> {
          startedResult.fail(t);
          return null;
        });

  }
}

代码示例来源：origin: ef-labs/when.java

/**
 * Handle the ultimate fulfillment value or rejection reason, and assume
 * responsibility for all errors.  If an error propagates out of result
 * or handleFatalError, it will be rethrown to the host, resulting in a
 * loud stack track on most platforms and a crash on some.
 *
 * @param onResult function called when fulfilled
 * @param <U>      onResult thenable return type
 */
default <U> void done(Function<T, ? extends Thenable<U>> onResult) {
  done(onResult, null);
}

代码示例来源：origin: ef-labs/when.java

@Test
public void testPromise_inspect_when_inspecting_promises_should_return_rejected_state_for_rejected_promise() {
  Promise<Object> promise = when.reject(sentinelEx);
  promise.then(fail.onFulfilled, (t) -> {
    assertRejected(promise.inspect(), sentinelEx);
    return null;
  }).ensure(done::fulfill);
  done.assertFulfilled();
}

代码示例来源：origin: ef-labs/when.java

@Test
public void testElse_should_resolve_normally_if_previous_promise_doesnt_fail() throws Exception {
  when.resolve(input)
      .orElse(resolved(sentinel))
      .then((val) -> {
        assertEquals(input, val);
        return null;
      })
      .ensure(done::fulfill);
  done.assertFulfilled();
}

代码示例来源：origin: ef-labs/when.java

@Override
public <T, U> Promise<U> when(T x, Function<T, ? extends Thenable<U>> onFulfilled, Function<Throwable, ? extends Thenable<U>> onRejected) {
  Promise<T> p = resolve(x);
  return p.then(onFulfilled, onRejected);
}

代码示例来源：origin: ef-labs/when.java

@Test
public void testFold_should_reject_and_not_call_combine_if_promise_rejects() throws Exception {
  when.<Integer>reject(sentinelEx)
      .fold(noop, resolved(2))
      .otherwise((e) -> {
        assertEquals(sentinelEx, e);
        return null;
      })
      .then(done.onFulfilled, done.onRejected);
  done.assertFulfilled();
}

代码示例来源：origin: ef-labs/when.java

@Test
public void testPromise_yield_should_fulfill_with_value_of_a_fulfilled_promise() {
  when.resolve(other)
      .yield(resolved(sentinel))
      .then(
          (value) -> {
            assertEquals(sentinel, value);
            return null;
          }
      )
      .ensure(done::fulfill);
  done.assertFulfilled();
}

代码示例来源：origin: ef-labs/when.java

@Test
public void testPromise_tap_should_fulfill_with_the_original_value() {
  when.resolve(sentinel)
      .tap((x) -> {
        return resolved(other);
      })
      .then((value) -> {
        assertEquals(sentinel, value);
        return null;
      })
      .ensure(done::fulfill);
  done.assertFulfilled();
}

代码示例来源：origin: ef-labs/when.java

@Test
public void testFold_should_pass_value_and_arg() throws Exception {
  when.<Object>resolve(other)
      .fold((a, b) -> {
        assertEquals(sentinel, a);
        assertEquals(other, b);
        return null;
      }, resolved(sentinel))
      .then(done.onFulfilled, done.onRejected);
  done.assertFulfilled();
}

代码示例来源：origin: ef-labs/when.java

@Test
public void testPromise_otherwise_should_register_errback() {
  when.reject(sentinelEx)
      .otherwise(
          (val) -> {
            assertEquals(sentinelEx, val);
            return null;
          })
      .ensure(done::fulfill);
  done.assertFulfilled();
}

代码示例来源：origin: ef-labs/when.java

@Test
public void testPromise_otherwise_should_return_a_promise() {
  assertNotNull(when.defer().getPromise().otherwise(null));
}

代码示例来源：origin: ef-labs/vertx-cassandra

@Test
public void testReadyReject() throws Exception {
  Promise<Void> p = whenCassandraSession.ready();
  State<Void> state = p.inspect();
  assertEquals(HandlerState.PENDING, state.getState());
  verify(cassandraSession).onReady(onReadyCaptor.capture());
  onReadyCaptor.getValue().handle(Future.failedFuture("Test fail"));
  state = p.inspect();
  assertEquals(HandlerState.REJECTED, state.getState());
}

代码示例来源：origin: ef-labs/when.java

@Override
public <T, U> Promise<U> when(Thenable<T> x, Function<T, ? extends Thenable<U>> onFulfilled, Function<Throwable, ? extends Thenable<U>> onRejected) {
  Promise<T> p = resolve(x);
  return p.then(onFulfilled, onRejected);
}

代码示例来源：origin: ef-labs/when.java

@Test
public void testFold_should_reject_and_not_call_combine_if_arg_rejects() throws Exception {
  when.resolve(1)
      .fold(noop, when.reject(sentinelEx))
      .otherwise((e) -> {
        assertEquals(sentinelEx, e);
        return null;
      })
      .then(done.onFulfilled, done.onRejected);
  done.assertFulfilled();
}

代码示例来源：origin: ef-labs/when.java

@Test
public void testElse_should_resolve_with_else_value_if_previous_promise_fails() throws Exception {
  when.reject(new RuntimeException())
      .orElse(resolved(sentinel))
      .then((val) -> {
        assertEquals(sentinel, val);
        return null;
      })
      .ensure(done::fulfill);
  done.assertFulfilled();
}

代码示例来源：origin: ef-labs/vertx-cassandra

@Test
public void testReady() throws Exception {
  Promise<Void> p = whenCassandraSession.ready();
  State<Void> state = p.inspect();
  assertEquals(HandlerState.PENDING, state.getState());
  verify(cassandraSession).onReady(onReadyCaptor.capture());
  onReadyCaptor.getValue().handle(Future.succeededFuture());
  state = p.inspect();
  assertEquals(HandlerState.FULFILLED, state.getState());
}

代码示例来源：origin: ef-labs/vertx-jersey

@GET
@Produces(MediaType.TEXT_PLAIN)
public void getString(@Suspended AsyncResponse asyncResponse) throws IOException {
  Deferred<String> d = when.defer();
  d.getPromise()
      .then(str -> {
        asyncResponse.resume(str);
        return null;
      })
      .otherwise(t -> {
        asyncResponse.resume(new WebApplicationException(t));
        return null;
      });
  d.resolve("when.java!");
}

代码示例来源：origin: ef-labs/when.java

/**
   * try/lift helper that allows specifying thisArg
   */
  private <T, U> Promise<U> _apply(Function<List<T>, Thenable<U>> f, List<Thenable<T>> args) {
    return helper.all(args).then(f::apply);
//        return Promise.all(args).then(function(args) {
//            return f.apply(thisArg, args);
//        });
  }

代码示例来源：origin: ef-labs/when.java

@Test
public void testFold_should_reject_if_combine_throws() throws Exception {
  when.resolve(1)
      .fold((x, y) -> {
        throw sentinelEx;
      }, resolved(2))
      .otherwise((e) -> {
        assertEquals(sentinelEx, e);
        return null;
      })
      .then(done.onFulfilled, done.onRejected);
  done.assertFulfilled();
}

代码示例来源：origin: ef-labs/when.java

@Test
public void testPromise_inspect_when_inspecting_promises_should_return_fulfilled_state_for_fulfilled_promise() {
  Promise<Sentinel> promise = when.resolve(sentinel);
  promise.then((x) -> {
    assertFulfilled(promise.inspect(), sentinel);
    return null;
  }).ensure(done::fulfill);
  done.assertFulfilled();
}