dubbo FutureToObserverAdaptor 源码
dubbo FutureToObserverAdaptor 代码
文件路径：/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/stub/FutureToObserverAdaptor.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.dubbo.rpc.stub;
import org.apache.dubbo.common.stream.StreamObserver;
import java.util.concurrent.CompletableFuture;
public class FutureToObserverAdaptor<T> implements StreamObserver<T> {
private final CompletableFuture<T> future;
public FutureToObserverAdaptor(CompletableFuture<T> future) {
this.future = future;
}
@Override
public void onNext(T data) {
if (future.isDone() || future.isCancelled() || future.isCompletedExceptionally()) {
throw new IllegalStateException("Too many response for unary method");
}
future.complete(data);
}
@Override
public void onError(Throwable throwable) {
if (future.isDone() || future.isCancelled() || future.isCompletedExceptionally()) {
throw new IllegalStateException("Too many response for unary method");
}
future.completeExceptionally(throwable);
}
@Override
public void onCompleted() {
if (future.isDone() || future.isCancelled() || future.isCompletedExceptionally()) {
return;
}
throw new IllegalStateException("Completed without value or exception ");
}
}
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