This commit is contained in:
Dhawal Kapil 2018-08-27 23:36:29 +05:30
commit 1d0581cafb
15 changed files with 471 additions and 4 deletions

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@ -2,6 +2,7 @@ package com.baeldung.collection;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import org.junit.Assert;
@ -35,8 +36,9 @@ public class StreamOperateAndRemoveUnitTest {
@Test
public void givenAListOf10Items_whenOperateAndRemoveQualifiedItemsUsingRemoveIf_thenListContains5Items() {
itemList.stream().filter(item -> item.isQualified()).forEach(item -> item.operate());
itemList.removeIf(item -> item.isQualified());
final Predicate<Item> isQualified = item -> item.isQualified();
itemList.stream().filter(isQualified).forEach(item -> item.operate());
itemList.removeIf(isQualified);
Assert.assertEquals(5, itemList.size());
}

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@ -9,4 +9,5 @@
- [Introduction to JCache](http://www.baeldung.com/jcache)
- [A Guide to Apache Ignite](http://www.baeldung.com/apache-ignite)
- [Apache Ignite with Spring Data](http://www.baeldung.com/apache-ignite-spring-data)
- [Guide to JMapper](https://github.com/eugenp/tutorials/tree/master/libraries-data)
- [Guide to JMapper](https://www.baeldung.com/jmapper)
- [A Guide to Apache Crunch](https://www.baeldung.com/crunch)

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@ -148,6 +148,44 @@
<version>${jmapper.version}</version>
</dependency>
<!-- crunch project -->
<dependency>
<groupId>org.apache.crunch</groupId>
<artifactId>crunch-core</artifactId>
<version>${org.apache.crunch.crunch-core.version}</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-client</artifactId>
<version>${org.apache.hadoop.hadoop-client}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>commons-cli</groupId>
<artifactId>commons-cli</artifactId>
<version>1.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>commons-httpclient</groupId>
<artifactId>commons-httpclient</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
<exclusions>
<exclusion>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
@ -252,6 +290,31 @@
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.3</version>
<configuration>
<descriptors>
<descriptor>src/main/assembly/hadoop-job.xml</descriptor>
</descriptors>
<archive>
<manifest>
<mainClass>com.baeldung.crunch.WordCount</mainClass>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
@ -283,6 +346,8 @@
<datanucleus-xml.version>5.0.0-release</datanucleus-xml.version>
<datanucleus-jdo-query.version>5.0.4</datanucleus-jdo-query.version>
<jmapper.version>1.6.0.1</jmapper.version>
<org.apache.crunch.crunch-core.version>0.15.0</org.apache.crunch.crunch-core.version>
<org.apache.hadoop.hadoop-client>2.2.0</org.apache.hadoop.hadoop-client>
</properties>
</project>

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@ -0,0 +1,28 @@
<?xml version="1.0" encoding="UTF-8"?>
<assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0 http://maven.apache.org/xsd/assembly-1.1.0.xsd">
<id>job</id>
<formats>
<format>jar</format>
</formats>
<includeBaseDirectory>false</includeBaseDirectory>
<dependencySets>
<dependencySet>
<unpack>false</unpack>
<scope>runtime</scope>
<outputDirectory>lib</outputDirectory>
<excludes>
<exclude>${groupId}:${artifactId}</exclude>
</excludes>
</dependencySet>
<dependencySet>
<unpack>true</unpack>
<includes>
<include>${groupId}:${artifactId}</include>
</includes>
</dependencySet>
</dependencySets>
</assembly>

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@ -0,0 +1,25 @@
package com.baeldung.crunch;
import java.util.Set;
import org.apache.crunch.FilterFn;
import com.google.common.collect.ImmutableSet;
/**
* A filter that removes known stop words.
*/
public class StopWordFilter extends FilterFn<String> {
// English stop words, borrowed from Lucene.
private static final Set<String> STOP_WORDS = ImmutableSet
.copyOf(new String[] { "a", "and", "are", "as", "at", "be", "but", "by",
"for", "if", "in", "into", "is", "it", "no", "not", "of", "on",
"or", "s", "such", "t", "that", "the", "their", "then", "there",
"these", "they", "this", "to", "was", "will", "with" });
@Override
public boolean accept(String word) {
return !STOP_WORDS.contains(word);
}
}

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@ -0,0 +1,11 @@
package com.baeldung.crunch;
import org.apache.crunch.MapFn;
public class ToUpperCaseFn extends MapFn<String, String> {
@Override
public String map(String input) {
return input != null ? input.toUpperCase() : input;
}
}

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@ -0,0 +1,20 @@
package com.baeldung.crunch;
import org.apache.crunch.MapFn;
@SuppressWarnings("serial")
public class ToUpperCaseWithCounterFn extends MapFn<String, String> {
@Override
public String map(String input) {
if (input == null) {
return input;
} else {
String output = input.toUpperCase();
if (!input.equals(output)) {
increment("UpperCase", "modified");
}
return output;
}
}
}

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@ -0,0 +1,23 @@
package com.baeldung.crunch;
import org.apache.crunch.DoFn;
import org.apache.crunch.Emitter;
import com.google.common.base.Splitter;
/**
* Splits a line of text, filtering known stop words.
*/
public class Tokenizer extends DoFn<String, String> {
private static final Splitter SPLITTER = Splitter
.onPattern("\\s+")
.omitEmptyStrings();
@Override
public void process(String line,
Emitter<String> emitter) {
for (String word : SPLITTER.split(line)) {
emitter.emit(word);
}
}
}

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@ -0,0 +1,62 @@
package com.baeldung.crunch;
import org.apache.crunch.PCollection;
import org.apache.crunch.PTable;
import org.apache.crunch.Pipeline;
import org.apache.crunch.PipelineResult;
import org.apache.crunch.impl.mr.MRPipeline;
import org.apache.crunch.types.writable.Writables;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.util.GenericOptionsParser;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
/**
* A word count example for Apache Crunch, based on Crunch's example projects.
*/
public class WordCount extends Configured implements Tool {
public static void main(String[] args) throws Exception {
ToolRunner.run(new Configuration(), new WordCount(), args);
}
public int run(String[] args) throws Exception {
if (args.length != 2) {
System.err.println("Usage: hadoop jar crunch-1.0.0-SNAPSHOT-job.jar" + " [generic options] input output");
System.err.println();
GenericOptionsParser.printGenericCommandUsage(System.err);
return 1;
}
String inputPath = args[0];
String outputPath = args[1];
// Create an object to coordinate pipeline creation and execution.
Pipeline pipeline = new MRPipeline(WordCount.class, getConf());
// Reference a given text file as a collection of Strings.
PCollection<String> lines = pipeline.readTextFile(inputPath);
// Define a function that splits each line in a PCollection of Strings into
// a PCollection made up of the individual words in the file.
// The second argument sets the serialization format.
PCollection<String> words = lines.parallelDo(new Tokenizer(), Writables.strings());
// Take the collection of words and remove known stop words.
PCollection<String> noStopWords = words.filter(new StopWordFilter());
// The count method applies a series of Crunch primitives and returns
// a map of the unique words in the input PCollection to their counts.
PTable<String, Long> counts = noStopWords.count();
// Instruct the pipeline to write the resulting counts to a text file.
pipeline.writeTextFile(counts, outputPath);
// Execute the pipeline as a MapReduce.
PipelineResult result = pipeline.done();
return result.succeeded() ? 0 : 1;
}
}

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@ -0,0 +1,89 @@
package com.baeldung.crunch;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertIterableEquals;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Calendar;
import org.apache.crunch.PCollection;
import org.apache.crunch.Pipeline;
import org.apache.crunch.Source;
import org.apache.crunch.Target;
import org.apache.crunch.impl.mem.MemPipeline;
import org.apache.crunch.io.From;
import org.apache.crunch.io.To;
import org.junit.Ignore;
import org.junit.Test;
public class MemPipelineUnitTest {
private static final String INPUT_FILE_PATH = "src/test/resources/crunch/input.txt";
@Test
public void givenPipeLineAndSource_whenSourceRead_thenExpectedNumberOfRecordsRead() {
Pipeline pipeline = MemPipeline.getInstance();
Source<String> source = From.textFile(INPUT_FILE_PATH);
PCollection<String> lines = pipeline.read(source);
assertEquals(21, lines.asCollection()
.getValue()
.size());
}
@Test
public void givenPipeLine_whenTextFileRead_thenExpectedNumberOfRecordsRead() {
Pipeline pipeline = MemPipeline.getInstance();
PCollection<String> lines = pipeline.readTextFile(INPUT_FILE_PATH);
assertEquals(21, lines.asCollection()
.getValue()
.size());
}
private String createOutputPath() throws IOException {
Path path = Files.createTempDirectory("test");
final String outputFilePath = path.toString() + File.separatorChar
+ "output.text";
return outputFilePath;
}
@Test
@Ignore("Requires Hadoop binaries")
public void givenCollection_whenWriteCalled_fileWrittenSuccessfully()
throws IOException {
PCollection<String> inputStrings = MemPipeline.collectionOf("Hello",
"Apache", "Crunch", Calendar.getInstance()
.toString());
final String outputFilePath = createOutputPath();
Target target = To.textFile(outputFilePath);
inputStrings.write(target);
Pipeline pipeline = MemPipeline.getInstance();
PCollection<String> lines = pipeline.readTextFile(outputFilePath);
assertIterableEquals(inputStrings.materialize(), lines.materialize());
}
@Test
@Ignore("Requires Hadoop binaries")
public void givenPipeLine_whenWriteTextFileCalled_fileWrittenSuccessfully()
throws IOException {
Pipeline pipeline = MemPipeline.getInstance();
PCollection<String> inputStrings = MemPipeline.collectionOf("Hello",
"Apache", "Crunch", Calendar.getInstance()
.toString());
final String outputFilePath = createOutputPath();
pipeline.writeTextFile(inputStrings, outputFilePath);
PCollection<String> lines = pipeline.readTextFile(outputFilePath);
assertIterableEquals(inputStrings.materialize(), lines.materialize());
}
}

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@ -0,0 +1,41 @@
package com.baeldung.crunch;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import org.apache.crunch.FilterFn;
import org.apache.crunch.PCollection;
import org.apache.crunch.impl.mem.MemPipeline;
import org.junit.Test;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
public class StopWordFilterUnitTest {
@Test
public void givenFilter_whenStopWordPassed_thenFalseReturned() {
FilterFn<String> filter = new StopWordFilter();
assertFalse(filter.accept("the"));
}
@Test
public void givenFilter_whenNonStopWordPassed_thenTrueReturned() {
FilterFn<String> filter = new StopWordFilter();
assertTrue(filter.accept("Hello"));
}
@Test
public void givenWordCollection_whenFiltered_thenStopWordsRemoved() {
PCollection<String> words = MemPipeline.collectionOf("This", "is", "a",
"test", "sentence");
PCollection<String> noStopWords = words.filter(new StopWordFilter());
assertEquals(ImmutableList.of("This", "test", "sentence"),
Lists.newArrayList(noStopWords.materialize()));
}
}

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@ -0,0 +1,21 @@
package com.baeldung.crunch;
import static org.junit.Assert.assertEquals;
import org.apache.crunch.impl.mem.emit.InMemoryEmitter;
import org.junit.Test;
import com.google.common.collect.ImmutableList;
public class ToUpperCaseFnUnitTest {
@Test
public void givenString_whenToUpperCaseFnCalled_UpperCaseStringReturned() {
InMemoryEmitter<String> emitter = new InMemoryEmitter<String>();
new ToUpperCaseFn().process("input", emitter);
assertEquals(ImmutableList.of("INPUT"), emitter.getOutput());
}
}

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@ -0,0 +1,31 @@
package com.baeldung.crunch;
import static org.junit.Assert.assertEquals;
import org.apache.crunch.PCollection;
import org.apache.crunch.impl.mem.MemPipeline;
import org.apache.crunch.types.writable.Writables;
import org.junit.Before;
import org.junit.Test;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
public class ToUpperCaseWithCounterFnUnitTest {
@Before
public void setUp() throws Exception {
MemPipeline.clearCounters();
}
@Test
public void whenFunctionCalled_counterIncementendForChangedValues() {
PCollection<String> inputStrings = MemPipeline.collectionOf("This", "is", "a", "TEST", "string");
PCollection<String> upperCaseStrings = inputStrings.parallelDo(new ToUpperCaseWithCounterFn(), Writables.strings());
assertEquals(ImmutableList.of("THIS", "IS", "A", "TEST", "STRING"), Lists.newArrayList(upperCaseStrings.materialize()));
assertEquals(4L, MemPipeline.getCounters()
.findCounter("UpperCase", "modified")
.getValue());
}
}

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@ -0,0 +1,27 @@
package com.baeldung.crunch;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyNoMoreInteractions;
import org.apache.crunch.Emitter;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.junit.MockitoJUnitRunner;
@RunWith(MockitoJUnitRunner.class)
public class TokenizerUnitTest {
@Mock
private Emitter<String> emitter;
@Test
public void givenTokenizer_whenLineProcessed_thenOnlyExpectedWordsEmitted() {
Tokenizer splitter = new Tokenizer();
splitter.process(" hello world ", emitter);
verify(emitter).emit("hello");
verify(emitter).emit("world");
verifyNoMoreInteractions(emitter);
}
}

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@ -0,0 +1,21 @@
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