Github user davidyan74 commented on a diff in the pull request:
https://github.com/apache/incubator-apex-malhar/pull/261#discussion_r63109747
--- Diff:
stream/src/main/java/org/apache/apex/malhar/stream/api/impl/StreamFactory.java
---
@@ -0,0 +1,81 @@
+/**
+ * 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.impl;
+
+import org.apache.apex.malhar.stream.api.ApexStream;
+
+import com.datatorrent.api.InputOperator;
+import com.datatorrent.api.Operator;
+import com.datatorrent.contrib.kafka.KafkaSinglePortStringInputOperator;
+import com.datatorrent.lib.io.fs.AbstractFileInputOperator;
+
+/**
+ * A Factory class to build from different kind of input source
+ */
+public class StreamFactory
+{
+ public static ApexStream<String> fromFolder(String inputOperatorName,
String folderName)
+ {
+ AbstractFileInputOperator.FileLineInputOperator fileLineInputOperator
= new AbstractFileInputOperator.FileLineInputOperator();
+ fileLineInputOperator.setDirectory(folderName);
+ ApexStreamImpl<String> newStream = new ApexStreamImpl<>();
+ return newStream.addOperator(inputOperatorName, fileLineInputOperator,
null, fileLineInputOperator.output);
+ }
+
+ public static ApexStream<String> fromFolder(String folderName)
+ {
+ return fromFolder("FolderScanner", folderName);
+ }
+
+ public static ApexStream<String> fromKafka08(String zookeepers, String
topic)
+ {
+ return fromKafka08("Kafka08Input", zookeepers, topic);
+ }
+
+ public static ApexStream<String> fromKafka08(String inputName, String
zookeepers, String topic)
+ {
+ KafkaSinglePortStringInputOperator kafkaSinglePortStringInputOperator
= new KafkaSinglePortStringInputOperator();
+ kafkaSinglePortStringInputOperator.getConsumer().setTopic(topic);
+
kafkaSinglePortStringInputOperator.getConsumer().setZookeeper(zookeepers);
+ ApexStreamImpl<String> newStream = new ApexStreamImpl<>();
+ return newStream.addOperator(kafkaSinglePortStringInputOperator, null,
kafkaSinglePortStringInputOperator.outputPort);
+ }
+
+ public static <T> ApexStream<T> fromInput(String inputOperatorName,
InputOperator operator, Operator.OutputPort<T> outputPort)
+ {
+ ApexStreamImpl<T> newStream = new ApexStreamImpl<>();
+ return newStream.addOperator(inputOperatorName, operator, null,
outputPort);
+ }
+
+ public static <T> ApexStream<T> fromInput(InputOperator operator,
Operator.OutputPort<T> outputPort)
+ {
+ return fromInput(operator.toString(), operator, outputPort);
+ }
+
+ public static ApexStream<String> fromKafka09(String name, String
brokers, String topic)
--- End diff --
I think we will have to discuss whether or not to include the fromKafka
functions in this class.
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