[HUDI-1364] Add HoodieJavaEngineContext to hudi-java-client (#2222)

hudi-client/hudi-java-client/src/main/java/org/apache/hudi/client/common/HoodieJavaEngineContext.java

@@ -0,0 +1,86 @@
+/*
+ * 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.hadoop.conf.Configuration;
+import org.apache.hudi.client.common.function.SerializableConsumer;
+import org.apache.hudi.client.common.function.SerializableFunction;
+import org.apache.hudi.client.common.function.SerializablePairFunction;
+import org.apache.hudi.common.config.SerializableConfiguration;
+import org.apache.hudi.common.util.Option;
+
+import scala.Tuple2;
+
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static java.util.stream.Collectors.toList;
+import static org.apache.hudi.client.common.function.FunctionWrapper.throwingFlatMapWrapper;
+import static org.apache.hudi.client.common.function.FunctionWrapper.throwingForeachWrapper;
+import static org.apache.hudi.client.common.function.FunctionWrapper.throwingMapToPairWrapper;
+import static org.apache.hudi.client.common.function.FunctionWrapper.throwingMapWrapper;
+
+/**
+ * A java engine implementation of HoodieEngineContext.
+ */
+public class HoodieJavaEngineContext extends HoodieEngineContext {
+
+  public HoodieJavaEngineContext(Configuration conf, TaskContextSupplier taskContextSupplier) {
+    super(new SerializableConfiguration(conf), taskContextSupplier);
+  }
+
+  @Override
+  public <I, O> List<O> map(List<I> data, SerializableFunction<I, O> func, int parallelism) {
+    return data.stream().parallel().map(throwingMapWrapper(func)).collect(toList());
+  }
+
+  @Override
+  public <I, O> List<O> flatMap(List<I> data, SerializableFunction<I, Stream<O>> func, int parallelism) {
+    return data.stream().parallel().flatMap(throwingFlatMapWrapper(func)).collect(toList());
+  }
+
+  @Override
+  public <I> void foreach(List<I> data, SerializableConsumer<I> consumer, int parallelism) {
+    data.stream().forEach(throwingForeachWrapper(consumer));
+  }
+
+  @Override
+  public <I, K, V> Map<K, V> mapToPair(List<I> data, SerializablePairFunction<I, K, V> func, Integer parallelism) {
+    return data.stream().map(throwingMapToPairWrapper(func)).collect(
+        Collectors.toMap(Tuple2::_1, Tuple2::_2, (oldVal, newVal) -> newVal)
+    );
+  }
+
+  @Override
+  public void setProperty(EngineProperty key, String value) {
+    // no operation for now
+  }
+
+  @Override
+  public Option<String> getProperty(EngineProperty key) {
+    return Option.empty();
+  }
+
+  @Override
+  public void setJobStatus(String activeModule, String activityDescription) {
+    // no operation for now
+  }
+}

hudi-client/hudi-java-client/src/main/resources/log4j.properties

@@ -0,0 +1,23 @@
+###
+# 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=INFO, A1
+# A1 is set to be a ConsoleAppender.
+log4j.appender.A1=org.apache.log4j.ConsoleAppender
+# A1 uses PatternLayout.
+log4j.appender.A1.layout=org.apache.log4j.PatternLayout
+log4j.appender.A1.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n