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Refactor MonoToListenableFutureAdapter 

Closes gh-25561
This commit is contained in:
Rossen Stoyanchev 2020-08-14 10:16:20 +01:00
parent a7f71f4d9b
commit 7758ba3c7e
1 changed files with 6 additions and 67 deletions
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73
spring-core/src/main/java/org/springframework/util/concurrent/MonoToListenableFutureAdapter.java
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@ -1,5 +1,5 @@
/*
* Copyright 2002-2018 the original author or authors.
* Copyright 2002-2020 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.
@ -16,83 +16,22 @@
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}.
* Adapts a {@link Mono} into a {@link ListenableFuture} by obtaining a
* {@code CompletableFuture} from the {@code Mono} via {@link Mono#toFuture()}
* and then adapting it with {@link CompletableToListenableFutureAdapter}.
*
* @author Rossen Stoyanchev
* @author Stephane Maldini
* @since 5.1
* @param <T> the object type
*/
@SuppressWarnings("deprecation")
public class MonoToListenableFutureAdapter<T> implements ListenableFuture<T> {
private final MonoProcessor<T> processor;
private final ListenableFutureCallbackRegistry<T> registry = new ListenableFutureCallbackRegistry<>();
public class MonoToListenableFutureAdapter<T> extends CompletableToListenableFutureAdapter<T> {
public MonoToListenableFutureAdapter(Mono<T> 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<? super T> callback) {
this.registry.addCallback(callback);
}
@Override
public void addCallback(SuccessCallback<? super T> success, FailureCallback failure) {
this.registry.addSuccessCallback(success);
this.registry.addFailureCallback(failure);
super(mono.toFuture());
}
}