Github user chinmaykolhatkar commented on a diff in the pull request:
https://github.com/apache/incubator-apex-malhar/pull/142#discussion_r48224124
--- Diff:
library/src/main/java/com/datatorrent/lib/simple/SingleInputOutput.java ---
@@ -0,0 +1,64 @@
+/**
+ * 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 com.datatorrent.lib.simple;
+
+import com.datatorrent.api.DefaultInputPort;
+import com.datatorrent.api.DefaultOutputPort;
+import com.datatorrent.api.annotation.Name;
+import com.datatorrent.api.annotation.Stateless;
+import com.datatorrent.common.util.BaseOperator;
+
+/**
+ * A base implementation of an operator that abstracts away the input and
output port.
+ *
+ * Subclasses should provide the implementation to process a tuple of type
I and return a tuple of
+ * type O.
+ *
+ * <p>
+ * <b>Input Port :</b><br>
+ * <b> input :</b> default input port. <br>
+ * <br>
+ * <b>Output Port :</b><br>
+ * <b> output :</b> default output port. <br>
+ * <br>
+ * <b>Stateful : No</b>, all state is handled through the implementing
class. <br>
+ * <b>Partitions : Yes</b>, no dependency among input tuples. <br>
+ * <br>
+ * @displayName Single Input & Output
+ * @category Simple Operators
+ * @tags simple, single input, single output
+ * @param <I> type being received from the input port
+ * @param <O> type being sent from the output port
+ * @since 3.3.0
+ */
+@Stateless
+@Name("single-input-output")
+public abstract class SingleInputOutput<I, O> extends BaseOperator
+{
+ protected final transient DefaultOutputPort<O> output = new
DefaultOutputPort<O>();
+ protected final transient DefaultInputPort<I> input = new
DefaultInputPort<I>() {
+ @Override
+ public void process(I inputTuple)
+ {
+ output.emit(SingleInputOutput.this.process(inputTuple));
+ }
+ };
+
+ abstract O process(I inputTuple);
--- End diff --
Can you add javadoc for process method?
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