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https://issues.apache.org/jira/browse/FLINK-4391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15683317#comment-15683317
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ASF GitHub Bot commented on FLINK-4391:
---------------------------------------
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2629#discussion_r88857479
--- Diff:
flink-streaming-java/src/test/java/org/apache/flink/streaming/api/operators/async/AsyncCollectorBufferTest.java
---
@@ -0,0 +1,277 @@
+/*
+ * 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.api.operators.async;
+
+import org.apache.flink.streaming.api.datastream.AsyncDataStream;
+import org.apache.flink.streaming.api.functions.async.AsyncFunction;
+import org.apache.flink.streaming.api.operators.AbstractStreamOperator;
+import org.apache.flink.streaming.api.operators.Output;
+import org.apache.flink.streaming.api.operators.TimestampedCollector;
+import org.apache.flink.streaming.api.watermark.Watermark;
+import org.apache.flink.streaming.runtime.streamrecord.LatencyMarker;
+import org.apache.flink.streaming.runtime.streamrecord.StreamElement;
+import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.internal.util.reflection.Whitebox;
+
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * Tests for {@link AsyncCollectorBuffer}. These test that:
+ *
+ * <ul>
+ * <li>Add a new item into the buffer</li>
+ * <li>Ordered mode processing</li>
+ * <li>Unordered mode processing</li>
+ * <li>Error handling</li>
+ * </ul>
+ */
+public class AsyncCollectorBufferTest {
+ private AsyncFunction<Integer, Integer> function;
+
+ private AsyncWaitOperator<Integer, Integer> operator;
+
+ private AsyncCollectorBuffer<Integer, Integer> buffer;
+
+ private Output<StreamRecord<Integer>> output;
+
+ private TimestampedCollector<Integer> collector;
+
+ private Object lock = new Object();
+
+ @Before
+ public void setUp() throws Exception {
+ function = new AsyncFunction<Integer, Integer>() {
+ @Override
+ public void asyncInvoke(Integer input,
AsyncCollector<Integer, Integer> collector) throws Exception {
+
+ }
+ };
+
+ operator = new AsyncWaitOperator<>(function);
+ Class<?>[] classes =
AbstractStreamOperator.class.getDeclaredClasses();
+ Class<?> latencyClass = null;
+ for (Class<?> c : classes) {
+ if (c.getName().indexOf("LatencyGauge") != -1) {
+ latencyClass = c;
+ }
+ }
+
+ Constructor<?> explicitConstructor =
latencyClass.getDeclaredConstructors()[0];
+ explicitConstructor.setAccessible(true);
+ Whitebox.setInternalState(operator, "latencyGauge",
explicitConstructor.newInstance(10));
+
+ output = new FakedOutput(new ArrayList<Long>());
+ collector =new TimestampedCollector(output);
+
+ Whitebox.setInternalState(operator, "output", output);
--- End diff --
Then you could also change the history size of the latency gauge.
> Provide support for asynchronous operations over streams
> --------------------------------------------------------
>
> Key: FLINK-4391
> URL: https://issues.apache.org/jira/browse/FLINK-4391
> Project: Flink
> Issue Type: New Feature
> Components: DataStream API
> Reporter: Jamie Grier
> Assignee: david.wang
>
> Many Flink users need to do asynchronous processing driven by data from a
> DataStream. The classic example would be joining against an external
> database in order to enrich a stream with extra information.
> It would be nice to add general support for this type of operation in the
> Flink API. Ideally this could simply take the form of a new operator that
> manages async operations, keeps so many of them in flight, and then emits
> results to downstream operators as the async operations complete.
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