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/*
* Copyright 2002-2016 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.messaging.tcp.reactor;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import reactor.fn.Consumer;
import reactor.rx.Promise;
import org.springframework.util.Assert;
import org.springframework.util.concurrent.FailureCallback;
import org.springframework.util.concurrent.ListenableFuture;
import org.springframework.util.concurrent.ListenableFutureCallback;
import org.springframework.util.concurrent.ListenableFutureCallbackRegistry;
import org.springframework.util.concurrent.SuccessCallback;
/**
* Adapts a reactor {@link Promise} to {@link ListenableFuture} optionally converting
* the result Object type {@code <S>} to the expected target type {@code <T>}.
*
* @author Rossen Stoyanchev
* @since 4.0
* @param <S> the type of object expected from the {@link Promise}
* @param <T> the type of object expected from the {@link ListenableFuture}
*/
abstract class AbstractPromiseToListenableFutureAdapter<S, T> implements ListenableFuture<T> {
private final Promise<S> promise;
private final ListenableFutureCallbackRegistry<T> registry = new ListenableFutureCallbackRegistry<T>();
protected AbstractPromiseToListenableFutureAdapter(Promise<S> promise) {
Assert.notNull(promise, "Promise must not be null");
this.promise = promise;
this.promise.onSuccess(new Consumer<S>() {
@Override
public void accept(S result) {
T adapted;
try {
adapted = adapt(result);
}
catch (Throwable ex) {
registry.failure(ex);
return;
}
registry.success(adapted);
}
});
this.promise.onError(new Consumer<Throwable>() {
@Override
public void accept(Throwable ex) {
registry.failure(ex);
}
});
}
@Override
public T get() throws InterruptedException {
S result = this.promise.await();
return adapt(result);
}
@Override
public T get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
S result = this.promise.await(timeout, unit);
if (!this.promise.isComplete()) {
throw new TimeoutException();
}
return adapt(result);
}
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
return false;
}
@Override
public boolean isCancelled() {
return false;
}
@Override
public boolean isDone() {
return this.promise.isComplete();
}
@Override
public void addCallback(ListenableFutureCallback<? super T> callback) {
this.registry.addCallback(callback);
}
@Override
public void addCallback(SuccessCallback<? super T> successCallback, FailureCallback failureCallback) {
this.registry.addSuccessCallback(successCallback);
this.registry.addFailureCallback(failureCallback);
}
protected abstract T adapt(S result);
}
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