/*
* Copyright 2015 the original author or 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 io.atomix.catalyst.concurrent;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Executor;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
/**
* Special implementation of {@link java.util.concurrent.CompletableFuture} with missing utility methods.
*
* @author <a href="http://github.com/kuujo">Jordan Halterman</a>
*/
public class ComposableFuture<T> extends CompletableFuture<T> implements BiConsumer<T, Throwable> {
@Override
public void accept(T result, Throwable error) {
if (error == null) {
complete(result);
} else {
completeExceptionally(error);
}
}
/**
* Sets a consumer to be called when the future is failed.
*
* @param consumer The consumer to call.
* @return A new future.
*/
public CompletableFuture<T> except(Consumer<Throwable> consumer) {
return whenComplete((result, error) -> {
if (error != null) {
consumer.accept(error);
}
});
}
/**
* Sets a consumer to be called asynchronously when the future is failed.
*
* @param consumer The consumer to call.
* @return A new future.
*/
public CompletableFuture<T> exceptAsync(Consumer<Throwable> consumer) {
return whenCompleteAsync((result, error) -> {
if (error != null) {
consumer.accept(error);
}
});
}
/**
* Sets a consumer to be called asynchronously when the future is failed.
*
* @param consumer The consumer to call.
* @param executor The executor with which to call the consumer.
* @return A new future.
*/
public CompletableFuture<T> exceptAsync(Consumer<Throwable> consumer, Executor executor) {
return whenCompleteAsync((result, error) -> {
if (error != null) {
consumer.accept(error);
}
}, executor);
}
}