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https://issues.apache.org/jira/browse/APEXMALHAR-2006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15285757#comment-15285757
]
ASF GitHub Bot commented on APEXMALHAR-2006:
--------------------------------------------
Github user tweise commented on a diff in the pull request:
https://github.com/apache/incubator-apex-malhar/pull/261#discussion_r63450744
--- Diff:
stream/src/main/java/org/apache/apex/malhar/stream/api/ApexStream.java ---
@@ -0,0 +1,255 @@
+/**
+ * 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.apex.malhar.stream.api;
+
+
+import java.util.Map;
+
+import org.apache.apex.malhar.stream.api.function.Function;
+
+import com.datatorrent.api.Attribute;
+import com.datatorrent.api.Context.DAGContext;
+import com.datatorrent.api.Context.OperatorContext;
+import com.datatorrent.api.Context.PortContext;
+import com.datatorrent.api.DAG;
+import com.datatorrent.api.Operator;
+
+/**
+ * The stream interface to build a DAG
+ * @param <T>
+ */
+public interface ApexStream<T>
+{
+ /**
+ * Simple map transformation<br>
+ * Add an operator to the DAG which convert tuple T to tuple O
+ * @param mapFunction map function
+ * @param <O> Type of the output
+ * @return
+ */
+ <O> ApexStream<O> map(Function.MapFunction<T, O> mapFunction);
+
+ /**
+ * Simple map transformation<br>
+ * Add an operator to the DAG which convert tuple T to tuple O
+ * @param name operator name
+ * @param mapFunction map function
+ * @param <O> Type of the output
+ * @return
+ */
+ <O> ApexStream<O> map(String name, Function.MapFunction<T, O>
mapFunction);
+
+ /**
+ * Flat map transformation
+ * Add an operator to the DAG which convert tuple T to a collection of
tuple O
+ * @param flatten flat map
+ * @param <O> Type of the output
+ * @return
+ */
+ <O> ApexStream<O> flatMap(Function.FlatMapFunction<T, O> flatten);
+
+ /**
+ * Flat map transformation<br>
+ * Add an operator to the DAG which convert tuple T to a collection of
tuple O
+ * @param name operator name
+ * @param flatten
+ * @param <O> Type of the output
+ * @return
+ */
+ <O> ApexStream<O> flatMap(String name, Function.FlatMapFunction<T, O>
flatten);
+
+ /**
+ * Filter transformation<br>
+ * Add an operator to the DAG which filter out tuple T that cannot
satisfy the FilterFunction
+ * @param filter filter function
+ * @return
+ */
+ ApexStream<T> filter(Function.FilterFunction<T> filter);
+
+ /**
+ * Filter transformation<br>
+ * Add an operator to the DAG which filter out tuple T that cannot
satisfy the FilterFunction
+ * @param name operator name
+ * @param filter filter function
+ * @return
+ */
+ ApexStream<T> filter(String name, Function.FilterFunction<T> filter);
+
+ /**
+ * Reduce transformation<br>
+ * Add an operator to the DAG which merge tuple t1, t2 to new tuple
+ * @param reduce reduce function
+ * @return
+ */
+ ApexStream<T> reduce(Function.ReduceFunction reduce);
--- End diff --
raw type warning
> Stream API Design
> -----------------
>
> Key: APEXMALHAR-2006
> URL: https://issues.apache.org/jira/browse/APEXMALHAR-2006
> Project: Apache Apex Malhar
> Issue Type: Sub-task
> Reporter: Siyuan Hua
> Assignee: Siyuan Hua
> Fix For: 3.4.0
>
>
> Construct DAG in a similar way as Flink/Spark Streaming
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