org.apache.drill.common.concurrent.CheckedFuture Maven / Gradle / Ivy
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* distributed with this work for additional information
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* 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,
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* See the License for the specific language governing permissions and
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*/
package org.apache.drill.common.concurrent;
import org.apache.drill.shaded.guava.com.google.common.util.concurrent.Futures;
import org.apache.drill.shaded.guava.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.
*
* 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.
*
*
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.
*
*
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 extends ListenableFuture {
/**
* 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;
}