| /* |
| * 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.beam.fn.harness.state; |
| |
| import static org.junit.Assert.assertArrayEquals; |
| |
| import java.util.Iterator; |
| import org.apache.beam.fn.harness.state.StateFetchingIterators.LazyBlockingStateFetchingIterator; |
| import org.apache.beam.model.fnexecution.v1.BeamFnApi.StateGetResponse; |
| import org.apache.beam.model.fnexecution.v1.BeamFnApi.StateRequest; |
| import org.apache.beam.model.fnexecution.v1.BeamFnApi.StateResponse; |
| import org.apache.beam.vendor.grpc.v1p21p0.com.google.protobuf.ByteString; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.Iterators; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.JUnit4; |
| |
| /** Tests for {@link StateFetchingIterators}. */ |
| public class StateFetchingIteratorsTest { |
| /** Tests for {@link StateFetchingIterators.LazyBlockingStateFetchingIterator}. */ |
| @RunWith(JUnit4.class) |
| public static class LazyBlockingStateFetchingIteratorTest { |
| |
| @Test |
| public void testEmpty() throws Exception { |
| testFetch(ByteString.EMPTY); |
| } |
| |
| @Test |
| public void testNonEmpty() throws Exception { |
| testFetch(ByteString.copyFromUtf8("A")); |
| } |
| |
| @Test |
| public void testWithLastByteStringBeingEmpty() throws Exception { |
| testFetch(ByteString.copyFromUtf8("A"), ByteString.EMPTY); |
| } |
| |
| @Test |
| public void testMulti() throws Exception { |
| testFetch(ByteString.copyFromUtf8("BC"), ByteString.copyFromUtf8("DEF")); |
| } |
| |
| @Test |
| public void testMultiWithEmptyByteStrings() throws Exception { |
| testFetch( |
| ByteString.EMPTY, |
| ByteString.copyFromUtf8("BC"), |
| ByteString.EMPTY, |
| ByteString.EMPTY, |
| ByteString.copyFromUtf8("DEF"), |
| ByteString.EMPTY); |
| } |
| |
| private void testFetch(ByteString... expected) { |
| BeamFnStateClient fakeStateClient = |
| (requestBuilder, response) -> { |
| ByteString continuationToken = requestBuilder.getGet().getContinuationToken(); |
| |
| int requestedPosition = 0; // Default position is 0 |
| if (!ByteString.EMPTY.equals(continuationToken)) { |
| requestedPosition = Integer.parseInt(continuationToken.toStringUtf8()); |
| } |
| |
| // Compute the new continuation token |
| ByteString newContinuationToken = ByteString.EMPTY; |
| if (requestedPosition != expected.length - 1) { |
| newContinuationToken = |
| ByteString.copyFromUtf8(Integer.toString(requestedPosition + 1)); |
| } |
| response.complete( |
| StateResponse.newBuilder() |
| .setId(requestBuilder.getId()) |
| .setGet( |
| StateGetResponse.newBuilder() |
| .setData(expected[requestedPosition]) |
| .setContinuationToken(newContinuationToken)) |
| .build()); |
| }; |
| Iterator<ByteString> byteStrings = |
| new LazyBlockingStateFetchingIterator(fakeStateClient, StateRequest.getDefaultInstance()); |
| assertArrayEquals(expected, Iterators.toArray(byteStrings, Object.class)); |
| } |
| } |
| } |