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CallMerger.java
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CallMerger.java
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/*
* 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.beam.examples;
import org.apache.beam.sdk.Pipeline;
import org.apache.beam.sdk.io.TextIO;
import org.apache.beam.sdk.options.Default;
import org.apache.beam.sdk.options.Description;
import org.apache.beam.sdk.options.PipelineOptions;
import org.apache.beam.sdk.options.PipelineOptionsFactory;
import org.apache.beam.sdk.options.Validation.Required;
import org.apache.beam.sdk.transforms.DoFn;
import org.apache.beam.sdk.transforms.GroupByKey;
import org.apache.beam.sdk.transforms.PTransform;
import org.apache.beam.sdk.transforms.ParDo;
import org.apache.beam.sdk.values.KV;
import org.apache.beam.sdk.values.PCollection;
/**
* A naive simulation of the Variant Transforms pipeline.
* Modified from the WordCount example of Beam Java SDK.
*/
public class CallMerger {
/**
* This DoFn filters out lines starting with "##" and create a key for others.
*/
static class FilterOrKeyDoFn extends DoFn<String, KV<String, String>> {
@ProcessElement
public void processElement(ProcessContext c) {
if (c.element().startsWith("##")) return;
// Split the line into words.
String[] words = c.element().trim().split("\\s+");
if (words.length < 5) return;
StringBuilder b = new StringBuilder();
b.append(words[0]).append(":");
b.append(words[1]).append(":");
b.append(words[2]).append(":");
b.append(words[3]).append(":");
b.append(words[4]);
String key = b.toString();
c.output(KV.of(key, c.element()));
}
}
/**
* This DoFn merges lines with the same key by taking the first full line and
* adding the last word of other lines (e.g., simulating merging samples).
*/
static class MergeDoFn extends DoFn<KV<String, Iterable<String>>, String> {
@ProcessElement
public void processElement(ProcessContext c) {
boolean first = true;
StringBuilder b = new StringBuilder();
for (String line : c.element().getValue()) {
if (first) {
b.append(line);
first = false;
} else {
String[] words = line.split("\\s+");
// This section is added for making this a CPU intensive DoFn.
int s = 1;
for (int i = 0; i < 10000; i++) {
for (String word : words) {
s = (s * (i + word.length()) + 1) % 1000;
}
}
// End of dummy CPU intensive part.
if (words.length > 0) {
b.append("\t").append(words[words.length - 1]).append("\t").append(s);
}
}
}
c.output(b.toString());
}
}
/**
* A PTransform that converts a PCollection containing lines of text into a
* PCollection of merged lines based on line keys.
*/
public static class MergeCalls extends PTransform<PCollection<String>,
PCollection<String>> {
@Override
public PCollection<String> expand(PCollection<String> lines) {
// Convert lines of text into individual words.
PCollection<KV<String, String>> keyLines = lines.apply(
ParDo.of(new FilterOrKeyDoFn()));
PCollection<KV<String, Iterable<String>>> groupedLines =
keyLines.apply(GroupByKey.<String, String>create());
PCollection<String> mergedLines = groupedLines.apply(
ParDo.of(new MergeDoFn()));
return mergedLines;
}
}
/**
* Options supported by {@link CallMerger}.
*/
public interface CallMergerOptions extends PipelineOptions {
/**
* By default, this example reads from a public dataset containing the text
* of King Lear. Set this option to choose a different input file or glob.
*/
@Description("Path of the file to read from")
@Default.String("gs://apache-beam-samples/shakespeare/kinglear.txt")
String getInputFile();
void setInputFile(String value);
/**
* Set this required option to specify where to write the output.
*/
@Description("Path of the file to write to")
@Required
String getOutput();
void setOutput(String value);
}
public static void main(String[] args) {
CallMergerOptions options = PipelineOptionsFactory.fromArgs(args)
.withValidation().as(CallMergerOptions.class);
Pipeline p = Pipeline.create(options);
p.apply("ReadLines", TextIO.read().from(options.getInputFile()))
.apply(new MergeCalls())
.apply("WriteCounts", TextIO.write().to(options.getOutput()));
p.run().waitUntilFinish();
}
}