| /* |
| * Copyright 2014, Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package io.grpc.stub; |
| |
| import com.google.common.util.concurrent.ListenableFuture; |
| import com.google.common.util.concurrent.SettableFuture; |
| |
| 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. |
| */ |
| public class StreamRecorder<T> implements StreamObserver<T> { |
| |
| /** |
| * Create 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 onValue(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(); |
| } |
| |
| /** |
| * Wait for the stream to terminate. |
| */ |
| public void awaitCompletion() throws Exception { |
| latch.await(); |
| } |
| |
| /** |
| * Wait a fixed timeout for the stream to terminate. |
| */ |
| public boolean awaitCompletion(int timeout, TimeUnit unit) throws Exception { |
| return latch.await(timeout, unit); |
| } |
| |
| /** |
| * Return the current set of received values. |
| */ |
| public List<T> getValues() { |
| return Collections.unmodifiableList(results); |
| } |
| |
| /** |
| * Return the stream terminating error. |
| */ |
| @Nullable public Throwable getError() { |
| return error; |
| } |
| |
| /** |
| * Return a {@link ListenableFuture} for the first value received from the stream. Useful |
| * for testing unary call patterns. |
| */ |
| public ListenableFuture<T> firstValue() { |
| return firstValue; |
| } |
| } |