| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.drill.common.concurrent; |
| |
| import com.google.common.util.concurrent.Futures; |
| import com.google.common.util.concurrent.ListenableFuture; |
| |
| import java.util.concurrent.CancellationException; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.TimeoutException; |
| |
| /** |
| * A {@code CheckedFuture} is a {@link ListenableFuture} that includes versions of the {@code get} |
| * methods that can throw a checked exception. This makes it easier to create a future that executes |
| * logic which can throw an exception. |
| * |
| * <p>Implementations of this interface must adapt the exceptions thrown by {@code Future#get()}: |
| * {@link CancellationException}, {@link ExecutionException} and {@link InterruptedException} into |
| * the type specified by the {@code X} type parameter. |
| * |
| * <p>This interface also extends the ListenableFuture interface to allow listeners to be added. |
| * This allows the future to be used as a normal {@link Future} or as an asynchronous callback |
| * mechanism as needed. This allows multiple callbacks to be registered for a particular task, and |
| * the future will guarantee execution of all listeners when the task completes. |
| * |
| * <p>For a simpler alternative to CheckedFuture, consider accessing Future values with {@link |
| * Futures#getChecked(Future, Class) Futures.getChecked()}. |
| * |
| * This interface is moved from Guava, since there it was deleted. |
| * |
| */ |
| public interface CheckedFuture<V, X extends Exception> extends ListenableFuture<V> { |
| |
| /** |
| * Exception checking version of {@link Future#get()} that will translate {@link |
| * InterruptedException}, {@link CancellationException} and {@link ExecutionException} into |
| * application-specific exceptions. |
| * |
| * @return the result of executing the future. |
| * @throws X on interruption, cancellation or execution exceptions. |
| */ |
| V checkedGet() throws X; |
| |
| /** |
| * Exception checking version of {@link Future#get(long, TimeUnit)} that will translate {@link |
| * InterruptedException}, {@link CancellationException} and {@link ExecutionException} into |
| * application-specific exceptions. On timeout this method throws a normal {@link |
| * TimeoutException}. |
| * |
| * @return the result of executing the future. |
| * @throws TimeoutException if retrieving the result timed out. |
| * @throws X on interruption, cancellation or execution exceptions. |
| */ |
| V checkedGet(long timeout, TimeUnit unit) throws TimeoutException, X; |
| } |