Github user arunmahadevan commented on a diff in the pull request:
https://github.com/apache/storm/pull/1816#discussion_r92327978
--- Diff:
examples/storm-pmml-examples/src/main/java/org/apache/storm/pmml/RawInputFromCSVSpout.java
---
@@ -0,0 +1,133 @@
+/*
+ * 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.storm.pmml;
+
+import org.apache.storm.spout.SpoutOutputCollector;
+import org.apache.storm.task.TopologyContext;
+import org.apache.storm.topology.OutputFieldsDeclarer;
+import org.apache.storm.topology.base.BaseRichSpout;
+import org.apache.storm.tuple.Fields;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+
+public class RawInputFromCSVSpout extends BaseRichSpout {
+ private static final Logger LOG =
LoggerFactory.getLogger(RawInputFromCSVSpout.class);
+
+ private File csv;
+ private List<String> outputFields;
+ private BufferedReader br;
+ private SpoutOutputCollector collector;
+
+ public RawInputFromCSVSpout(File rawInputCsv, List<String>
outputFields) throws FileNotFoundException {
+ Objects.requireNonNull(rawInputCsv);
+ Objects.requireNonNull(outputFields);
+
+ this.csv = rawInputCsv;
+ this.outputFields = outputFields;
+ }
+
+ public static RawInputFromCSVSpout newInstance(File csv) throws
IOException {
+ List<String> outputFields;
+ try (BufferedReader br = newReader(csv)) {
+ String header = br.readLine();
+ LOG.debug("Header: {}", header);
+ header = header.replaceAll("\"", "");
+ LOG.debug("Processed header: {}", header);
+ final String[] inputNames = header.split(",");
+ outputFields = Arrays.asList(inputNames);
+ }
+ return new RawInputFromCSVSpout(csv, outputFields);
+ }
+
+ private static BufferedReader newReader(File csv) throws
FileNotFoundException {
+ return new BufferedReader(new InputStreamReader(new
FileInputStream(csv)));
+ }
+
+ @Override
+ public void open(Map conf, TopologyContext context,
SpoutOutputCollector collector) {
+ this.collector = collector;
+// openReader();
+ }
+
+ @Override
+ public void nextTuple() {
+ try {
+ String line = null;
+ while ((line = br.readLine()) != null) {
+ collector.emit(Arrays.asList(line.split(",")));
+ }
+ } catch (IOException e) {
+ closeReader();
+ e.printStackTrace();
+ }
+ }
+
+ @Override
+ public void declareOutputFields(OutputFieldsDeclarer declarer) {
+ declarer.declare(new Fields(outputFields));
+ }
+
+ @Override
+ public void activate() {
+ openReader();
--- End diff --
seems every time the spout is deactivated/activated it starts reading the
file from the beginning which may not be desirable.
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