| /* |
| * Copyright (C) 2011 The Guava Authors |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.google.common.util.concurrent; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| import com.google.common.annotations.GwtCompatible; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.TimeoutException; |
| |
| /** |
| * A {@link Future} implementation which always throws directly from calls to {@code get()} (i.e. |
| * not wrapped in {@code ExecutionException}. For just a normal failure, use {@link |
| * SettableFuture}). |
| * |
| * <p>Useful for testing the behavior of Future utilities against odd futures. |
| * |
| * @author Anthony Zana |
| */ |
| @GwtCompatible |
| final class UncheckedThrowingFuture<V> extends AbstractFuture<V> { |
| |
| public static <V> ListenableFuture<V> throwingError(Error error) { |
| UncheckedThrowingFuture<V> future = new UncheckedThrowingFuture<V>(); |
| future.complete(checkNotNull(error)); |
| return future; |
| } |
| |
| public static <V> ListenableFuture<V> throwingRuntimeException(RuntimeException e) { |
| UncheckedThrowingFuture<V> future = new UncheckedThrowingFuture<V>(); |
| future.complete(checkNotNull(e)); |
| return future; |
| } |
| |
| public static <V> UncheckedThrowingFuture<V> incomplete() { |
| return new UncheckedThrowingFuture<V>(); |
| } |
| |
| public void complete(RuntimeException e) { |
| if (!super.setException(new WrapperException(checkNotNull(e)))) { |
| throw new IllegalStateException("Future was already complete: " + this); |
| } |
| } |
| |
| public void complete(Error e) { |
| if (!super.setException(new WrapperException(checkNotNull(e)))) { |
| throw new IllegalStateException("Future was already complete: " + this); |
| } |
| } |
| |
| private static final class WrapperException extends Exception { |
| WrapperException(Throwable t) { |
| super(t); |
| } |
| } |
| |
| private static void rethrow(ExecutionException e) throws ExecutionException { |
| Throwable wrapper = e.getCause(); |
| if (wrapper instanceof WrapperException) { |
| Throwable cause = wrapper.getCause(); |
| if (cause instanceof RuntimeException) { |
| throw (RuntimeException) cause; |
| } else if (cause instanceof Error) { |
| throw (Error) cause; |
| } |
| } |
| throw e; |
| } |
| |
| @Override |
| public V get() throws ExecutionException, InterruptedException { |
| try { |
| super.get(); |
| } catch (ExecutionException e) { |
| rethrow(e); |
| } |
| throw new AssertionError("Unreachable"); |
| } |
| |
| @Override |
| public V get(long timeout, TimeUnit unit) |
| throws InterruptedException, ExecutionException, TimeoutException { |
| try { |
| super.get(timeout, unit); |
| } catch (ExecutionException e) { |
| rethrow(e); |
| } |
| throw new AssertionError("Unreachable"); |
| } |
| } |