org.springframework.util.concurrent.CompletableToListenableFutureAdapter Maven / Gradle / Ivy
/*
* Copyright 2002-2017 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 org.springframework.util.concurrent;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.function.BiFunction;
import org.springframework.lang.UsesJava8;
/**
* Adapts a {@link CompletableFuture} or {@link CompletionStage} into a
* Spring {@link ListenableFuture}.
*
* @author Sebastien Deleuze
* @author Juergen Hoeller
* @since 4.2
*/
@UsesJava8
public class CompletableToListenableFutureAdapter implements ListenableFuture {
private final CompletableFuture completableFuture;
private final ListenableFutureCallbackRegistry callbacks = new ListenableFutureCallbackRegistry();
/**
* Create a new adapter for the given {@link CompletionStage}.
* @since 4.3.7
*/
public CompletableToListenableFutureAdapter(CompletionStage completionStage) {
this(completionStage.toCompletableFuture());
}
/**
* Create a new adapter for the given {@link CompletableFuture}.
*/
public CompletableToListenableFutureAdapter(CompletableFuture completableFuture) {
this.completableFuture = completableFuture;
this.completableFuture.handle(new BiFunction() {
@Override
public Object apply(T result, Throwable ex) {
if (ex != null) {
callbacks.failure(ex);
}
else {
callbacks.success(result);
}
return null;
}
});
}
@Override
public void addCallback(ListenableFutureCallback callback) {
this.callbacks.addCallback(callback);
}
@Override
public void addCallback(SuccessCallback successCallback, FailureCallback failureCallback) {
this.callbacks.addSuccessCallback(successCallback);
this.callbacks.addFailureCallback(failureCallback);
}
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
return this.completableFuture.cancel(mayInterruptIfRunning);
}
@Override
public boolean isCancelled() {
return this.completableFuture.isCancelled();
}
@Override
public boolean isDone() {
return this.completableFuture.isDone();
}
@Override
public T get() throws InterruptedException, ExecutionException {
return this.completableFuture.get();
}
@Override
public T get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
return this.completableFuture.get(timeout, unit);
}
}