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new a4e3084ab92 [FLINK-37857][tests] Add a DSV2 sink implementation to
tests which can collect data
a4e3084ab92 is described below
commit a4e3084ab9220b02bc3eefc70ea372251aec7f07
Author: Gabor Somogyi <[email protected]>
AuthorDate: Thu May 29 08:50:32 2025 +0200
[FLINK-37857][tests] Add a DSV2 sink implementation to tests which can
collect data
---
.../streaming/util/testing/CollectingSink.java | 106 +++++++++++++++++++++
.../flink/runtime/util/CollectingSinkTest.java | 71 ++++++++++++++
2 files changed, 177 insertions(+)
diff --git
a/flink-streaming-java/src/test/java/org/apache/flink/streaming/util/testing/CollectingSink.java
b/flink-streaming-java/src/test/java/org/apache/flink/streaming/util/testing/CollectingSink.java
new file mode 100644
index 00000000000..a751d97eb7a
--- /dev/null
+++
b/flink-streaming-java/src/test/java/org/apache/flink/streaming/util/testing/CollectingSink.java
@@ -0,0 +1,106 @@
+/*
+ * 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.flink.streaming.util.testing;
+
+import org.apache.flink.api.connector.sink2.Sink;
+import org.apache.flink.api.connector.sink2.SinkWriter;
+import org.apache.flink.api.connector.sink2.WriterInitContext;
+
+import java.io.IOException;
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import java.util.concurrent.atomic.AtomicInteger;
+
+/** Sink for collecting output during testing. */
+public class CollectingSink<T> implements Sink<T> {
+ private static final long serialVersionUID = 1L;
+ private static final List<BlockingQueue<Object>> queues =
+ Collections.synchronizedList(new ArrayList<>());
+ private static final AtomicInteger numSinks = new AtomicInteger(-1);
+ private final int index;
+
+ public CollectingSink() {
+ this.index = numSinks.incrementAndGet();
+ queues.add(new LinkedBlockingQueue<>());
+ }
+
+ @Override
+ public SinkWriter<T> createWriter(WriterInitContext context) throws
IOException {
+ return new CollectingElementWriter(index);
+ }
+
+ private class CollectingElementWriter implements SinkWriter<T> {
+ private final int index;
+
+ public CollectingElementWriter(int index) {
+ this.index = index;
+ }
+
+ @Override
+ public void write(T element, Context context) {
+ queues.get(this.index).add(element);
+ }
+
+ @Override
+ public void flush(boolean endOfInput) {}
+
+ @Override
+ public void close() {}
+ }
+
+ @SuppressWarnings("unchecked")
+ public List<T> getRemainingOutput() {
+ return new ArrayList<>((BlockingQueue<T>) queues.get(this.index));
+ }
+
+ public boolean isEmpty() {
+ return queues.get(this.index).isEmpty();
+ }
+
+ public T poll() throws TimeoutException {
+ return this.poll(Duration.ofSeconds(15L));
+ }
+
+ @SuppressWarnings("unchecked")
+ public T poll(Duration duration) throws TimeoutException {
+ Object element;
+
+ try {
+ element = queues.get(this.index).poll(duration.toMillis(),
TimeUnit.MILLISECONDS);
+ } catch (InterruptedException var4) {
+ throw new RuntimeException(var4);
+ }
+
+ if (element == null) {
+ throw new TimeoutException();
+ } else {
+ return (T) element;
+ }
+ }
+
+ public void close() {
+ queues.get(this.index).clear();
+ }
+}
diff --git
a/flink-tests/src/test/java/org/apache/flink/runtime/util/CollectingSinkTest.java
b/flink-tests/src/test/java/org/apache/flink/runtime/util/CollectingSinkTest.java
new file mode 100644
index 00000000000..d4ea45ab9c5
--- /dev/null
+++
b/flink-tests/src/test/java/org/apache/flink/runtime/util/CollectingSinkTest.java
@@ -0,0 +1,71 @@
+/*
+ * 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.flink.runtime.util;
+
+import org.apache.flink.streaming.api.datastream.DataStreamSource;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.util.testing.CollectingSink;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.TimeoutException;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/** Tests {@link CollectingSink}. */
+class CollectingSinkTest {
+
+ private CollectingSink<Integer> sink;
+
+ @BeforeEach
+ public void setup() throws Exception {
+ StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+ env.setParallelism(1);
+
+ DataStreamSource<Integer> stream = env.fromData(0, 1,
2).setParallelism(1);
+
+ sink = new CollectingSink<>();
+ stream.sinkTo(sink);
+ env.execute();
+ }
+
+ @Test
+ void testGetRemainingOutputGivesBackData() {
+ List<Integer> result = sink.getRemainingOutput();
+
assertThat(result).containsExactlyInAnyOrderElementsOf(Arrays.asList(0, 1, 2));
+ closeAndAssertEmpty();
+ }
+
+ @Test
+ void testPollGivesBackData() throws TimeoutException {
+ for (int i = 0; i < 3; i++) {
+ assertThat(sink.poll()).isEqualTo(i);
+ }
+ closeAndAssertEmpty();
+ }
+
+ private void closeAndAssertEmpty() {
+ sink.close();
+ List<Integer> result = sink.getRemainingOutput();
+ assertThat(result).isEmpty();
+ }
+}
