| /* |
| * Copyright 2014 The gRPC 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 io.grpc.testing; |
| |
| import com.google.common.util.concurrent.ListenableFuture; |
| import com.google.common.util.concurrent.SettableFuture; |
| import io.grpc.ExperimentalApi; |
| import io.grpc.stub.StreamObserver; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.TimeUnit; |
| import javax.annotation.Nullable; |
| |
| /** |
| * Utility implementation of {@link StreamObserver} used in testing. Records all the observed |
| * values produced by the stream as well as any errors. |
| * |
| * @deprecated Not for public use |
| */ |
| @Deprecated |
| @ExperimentalApi("https://github.com/grpc/grpc-java/issues/1791") |
| public class StreamRecorder<T> implements StreamObserver<T> { |
| |
| /** |
| * Creates a new recorder. |
| */ |
| public static <T> StreamRecorder<T> create() { |
| return new StreamRecorder<T>(); |
| } |
| |
| private final CountDownLatch latch; |
| private final List<T> results; |
| private Throwable error; |
| private final SettableFuture<T> firstValue; |
| |
| private StreamRecorder() { |
| firstValue = SettableFuture.create(); |
| latch = new CountDownLatch(1); |
| results = Collections.synchronizedList(new ArrayList<T>()); |
| } |
| |
| @Override |
| public void onNext(T value) { |
| if (!firstValue.isDone()) { |
| firstValue.set(value); |
| } |
| results.add(value); |
| } |
| |
| @Override |
| public void onError(Throwable t) { |
| if (!firstValue.isDone()) { |
| firstValue.setException(t); |
| } |
| error = t; |
| latch.countDown(); |
| } |
| |
| @Override |
| public void onCompleted() { |
| if (!firstValue.isDone()) { |
| firstValue.setException(new IllegalStateException("No first value provided")); |
| } |
| latch.countDown(); |
| } |
| |
| /** |
| * Waits for the stream to terminate. |
| */ |
| public void awaitCompletion() throws Exception { |
| latch.await(); |
| } |
| |
| /** |
| * Waits a fixed timeout for the stream to terminate. |
| */ |
| public boolean awaitCompletion(int timeout, TimeUnit unit) throws Exception { |
| return latch.await(timeout, unit); |
| } |
| |
| /** |
| * Returns the current set of received values. |
| */ |
| public List<T> getValues() { |
| return Collections.unmodifiableList(results); |
| } |
| |
| /** |
| * Returns the stream terminating error. |
| */ |
| @Nullable public Throwable getError() { |
| return error; |
| } |
| |
| /** |
| * Returns a {@link ListenableFuture} for the first value received from the stream. Useful |
| * for testing unary call patterns. |
| */ |
| public ListenableFuture<T> firstValue() { |
| return firstValue; |
| } |
| } |