[HUDI-1328] Introduce HoodieFlinkEngineContext to hudi-flink-client (#2161)

hudi-client/hudi-flink-client/src/test/java/org/apache/hudi/client/common/TestHoodieFlinkEngineContext.java

@@ -0,0 +1,115 @@
+/*
+ * 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.hudi.client.common;
+
+import org.apache.hudi.common.util.Option;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import scala.Tuple2;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Supplier;
+
+/**
+ * Unit test against HoodieFlinkEngineContext.
+ */
+public class TestHoodieFlinkEngineContext {
+  private HoodieFlinkEngineContext context;
+
+  @BeforeEach
+  public void init() {
+    context = new HoodieFlinkEngineContext(new DummyTaskContextSupplier());
+  }
+
+  @Test
+  public void testMap() {
+    List<Integer> mapList = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
+    List<Integer> result = context.map(mapList, x -> x + 1, 2);
+    result.removeAll(mapList);
+
+    Assertions.assertEquals(1, result.size());
+    Assertions.assertEquals(11, result.get(0));
+  }
+
+  @Test
+  public void testFlatMap() {
+    List<String> list1 = Arrays.asList("a", "b", "c");
+    List<String> list2 = Arrays.asList("d", "e", "f");
+    List<String> list3 = Arrays.asList("g", "h", "i");
+
+    List<List<String>> inputList = new ArrayList<>();
+    inputList.add(list1);
+    inputList.add(list2);
+    inputList.add(list3);
+
+    List<String> result = context.flatMap(inputList, Collection::stream, 2);
+
+    Assertions.assertEquals(9, result.size());
+  }
+
+  @Test
+  public void testForeach() {
+    List<Integer> mapList = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
+    List<Integer> result = new ArrayList<>(10);
+    context.foreach(mapList, result::add, 2);
+
+    Assertions.assertEquals(result.size(), mapList.size());
+    Assertions.assertTrue(result.containsAll(mapList));
+  }
+
+  @Test
+  public void testMapToPair() {
+    List<String> mapList = Arrays.asList("hudi_flink", "hudi_spark");
+
+    Map<String, String> resultMap = context.mapToPair(mapList, x -> {
+      String[] splits = x.split("_");
+      return Tuple2.apply(splits[0], splits[1]);
+    }, 2);
+
+    Assertions.assertNotNull(resultMap.get("hudi"));
+  }
+
+  public static class DummyTaskContextSupplier extends TaskContextSupplier {
+
+    @Override
+    public Supplier<Integer> getPartitionIdSupplier() {
+      return null;
+    }
+
+    @Override
+    public Supplier<Integer> getStageIdSupplier() {
+      return null;
+    }
+
+    @Override
+    public Supplier<Long> getAttemptIdSupplier() {
+      return null;
+    }
+
+    @Override
+    public Option<String> getProperty(EngineProperty prop) {
+      return null;
+    }
+  }
+}

hudi-client/hudi-flink-client/src/test/resources/log4j-surefire.properties

@@ -0,0 +1,31 @@
+###
+# 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.
+###
+log4j.rootLogger=WARN, CONSOLE
+log4j.logger.org.apache=INFO
+log4j.logger.org.apache.hudi=DEBUG
+log4j.logger.org.apache.hadoop.hbase=ERROR
+
+# A1 is set to be a ConsoleAppender.
+log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
+# A1 uses PatternLayout.
+log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
+log4j.appender.CONSOLE.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n
+log4j.appender.CONSOLE.filter.a=org.apache.log4j.varia.LevelRangeFilter
+log4j.appender.CONSOLE.filter.a.AcceptOnMatch=true
+log4j.appender.CONSOLE.filter.a.LevelMin=WARN
+log4j.appender.CONSOLE.filter.a.LevelMax=FATAL