org.springframework.util.concurrent.MonoToListenableFutureAdapter Maven / Gradle / Ivy
/*
* Copyright 2002-2018 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.time.Duration;
import java.util.concurrent.TimeUnit;
import reactor.core.publisher.Mono;
import reactor.core.publisher.MonoProcessor;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* Adapts a {@link Mono} into a {@link ListenableFuture}.
*
* @author Rossen Stoyanchev
* @author Stephane Maldini
* @since 5.1
* @param the object type
*/
public class MonoToListenableFutureAdapter implements ListenableFuture {
private final MonoProcessor processor;
private final ListenableFutureCallbackRegistry registry = new ListenableFutureCallbackRegistry<>();
public MonoToListenableFutureAdapter(Mono mono) {
Assert.notNull(mono, "Mono must not be null");
this.processor = mono
.doOnSuccess(this.registry::success)
.doOnError(this.registry::failure)
.toProcessor();
}
@Override
@Nullable
public T get() {
return this.processor.block();
}
@Override
@Nullable
public T get(long timeout, TimeUnit unit) {
Assert.notNull(unit, "TimeUnit must not be null");
Duration duration = Duration.ofMillis(TimeUnit.MILLISECONDS.convert(timeout, unit));
return this.processor.block(duration);
}
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
if (isCancelled()) {
return false;
}
this.processor.cancel();
// isCancelled may still return false, if mono completed before the cancel
return this.processor.isCancelled();
}
@Override
public boolean isCancelled() {
return this.processor.isCancelled();
}
@Override
public boolean isDone() {
return this.processor.isTerminated();
}
@Override
public void addCallback(ListenableFutureCallback callback) {
this.registry.addCallback(callback);
}
@Override
public void addCallback(SuccessCallback success, FailureCallback failure) {
this.registry.addSuccessCallback(success);
this.registry.addFailureCallback(failure);
}
}