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amit.pandey
2020-02-09 02:34:29 +05:30
parent 21382eeabf bab7334d78
commit 2b00a70195
12 changed files with 14 additions and 8 deletions
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2
core-java-modules/core-java-text/README.md
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### Relevant Articles:
- [An Overview of Regular Expressions Performance in Java](https://www.baeldung.com/java-regex-performance)
- [Pre-compile Regex Patterns Into Pattern Objects](https://www.baeldung.com/java-regex-pre-compile)
- [Pre-compile Regex Patterns Into Pattern Objects](https://www.baeldung.com/java-regex-pre-compile)

40
core-java-modules/core-java-text/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-text</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-text</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>${jmh-core.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>${jmh-core.version}</version>
</dependency>
</dependencies>
<build>
<finalName>core-java-text</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
</build>
</project>

92
core-java-modules/core-java-text/src/main/java/com/baeldung/patternreuse/PatternPerformanceComparison.java
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package com.baeldung.patternreuse;
import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.infra.Blackhole;
import org.openjdk.jmh.runner.RunnerException;
import java.io.IOException;
import java.time.Instant;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
@Fork(value = 1, warmups = 1)
@Warmup(iterations = 5)
@State(Scope.Benchmark)
public class PatternPerformanceComparison {
private static final String PATTERN = "\\d*[02468]";
private static List<String> values;
private static Matcher matcherFromPreCompiledPattern;
private static Pattern preCompiledPattern;
public static void main(String[] args) throws IOException, RunnerException {
org.openjdk.jmh.Main.main(args);
}
@Benchmark
public void matcherFromPreCompiledPatternResetMatches(Blackhole bh) {
//With pre-compiled pattern and reusing the matcher
// 1 Pattern object created
// 1 Matcher objects created
for (String value : values) {
bh.consume(matcherFromPreCompiledPattern.reset(value).matches());
}
}
@Benchmark
public void preCompiledPatternMatcherMatches(Blackhole bh) {
// With pre-compiled pattern
// 1 Pattern object created
// 5_000_000 Matcher objects created
for (String value : values) {
bh.consume(preCompiledPattern.matcher(value).matches());
}
}
@Benchmark
public void patternCompileMatcherMatches(Blackhole bh) {
// Above approach "Pattern.matches(PATTERN, value)" makes this internally
// 5_000_000 Pattern objects created
// 5_000_000 Matcher objects created
for (String value : values) {
bh.consume(Pattern.compile(PATTERN).matcher(value).matches());
}
}
@Benchmark
public void patternMatches(Blackhole bh) {
// Above approach "value.matches(PATTERN)" makes this internally
// 5_000_000 Pattern objects created
// 5_000_000 Matcher objects created
for (String value : values) {
bh.consume(Pattern.matches(PATTERN, value));
}
}
@Benchmark
public void stringMatchs(Blackhole bh) {
// 5_000_000 Pattern objects created
// 5_000_000 Matcher objects created
Instant start = Instant.now();
for (String value : values) {
bh.consume(value.matches(PATTERN));
}
}
@Setup()
public void setUp() {
preCompiledPattern = Pattern.compile(PATTERN);
matcherFromPreCompiledPattern = preCompiledPattern.matcher("");
values = new ArrayList<>();
for (int x = 1; x <= 5_000_000; x++) {
values.add(String.valueOf(x));
}
}
}

13
core-java-modules/core-java-text/src/main/resources/logback.xml
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<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>

63
core-java-modules/core-java-text/src/test/java/com/baeldung/patternreuse/PatternUnitTest.java
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package com.baeldung.patternreuse;
import org.junit.jupiter.api.Test;
import java.util.Arrays;
import java.util.List;
import java.util.function.Predicate;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static org.junit.Assert.*;
public class PatternUnitTest {
private static final Pattern FIRST_LAST_NAME_PRE_COMPILED_PATTERN = Pattern.compile("[a-zA-Z]{3,} [a-zA-Z]{3,}");
private static final Pattern SPLIT_PRE_COMPILED_PATTERN = Pattern.compile("__");
@Test
public void givenPreCompiledPattern_whenCallMatcher_thenReturnAMatcherToMatches() {
Matcher matcherName1 = FIRST_LAST_NAME_PRE_COMPILED_PATTERN.matcher("Fabio Silva");
Matcher matcherName2 = FIRST_LAST_NAME_PRE_COMPILED_PATTERN.matcher("Mr. Silva");
boolean matchesName1 = matcherName1.matches();
boolean matchesName2 = matcherName2.matches();
assertTrue(matchesName1);
assertFalse(matchesName2);
}
@Test
public void givenPreCompiledPattern_whenCallAsPredicate_thenReturnPredicateToFindPatternInTheList() {
List<String> namesToValidate = Arrays.asList("Fabio Silva", "Mr. Silva");
Predicate<String> patternsAsPredicate = FIRST_LAST_NAME_PRE_COMPILED_PATTERN.asPredicate();
List<String> validNames = namesToValidate.stream()
.filter(patternsAsPredicate)
.collect(Collectors.toList());
assertEquals(1, validNames.size());
assertTrue(validNames.contains("Fabio Silva"));
}
@Test
public void givenPreCompiledPattern_whenCallSplit_thenReturnArrayWithValuesSplitByThePattern() {
String[] textSplit = SPLIT_PRE_COMPILED_PATTERN.split("My_Name__is__Fabio_Silva");
assertEquals("My_Name", textSplit[0]);
assertEquals("is", textSplit[1]);
assertEquals("Fabio_Silva", textSplit[2]);
}
@Test
public void givenPreCompiledPattern_whenCallSplitAsStream_thenReturnArraySplitByThePattern() {
Stream<String> textSplitAsStream = SPLIT_PRE_COMPILED_PATTERN.splitAsStream("My_Name__is__Fabio_Silva");
String[] textSplit = textSplitAsStream.toArray(String[]::new);
assertEquals("My_Name", textSplit[0]);
assertEquals("is", textSplit[1]);
assertEquals("Fabio_Silva", textSplit[2]);
}
}

63
core-java-modules/core-java-text/src/test/java/com/baeldung/regex/matcher/MatcherUnitTest.java
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package com.baeldung.regex.matcher;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.junit.jupiter.api.Test;
public class MatcherUnitTest {
@Test
public void whenFindFourDigitWorks_thenCorrect() {
Pattern stringPattern = Pattern.compile("\\d\\d\\d\\d");
Matcher m = stringPattern.matcher("goodbye 2019 and welcome 2020");
assertTrue(m.find());
assertEquals(8, m.start());
assertEquals("2019", m.group());
assertEquals(12, m.end());
assertTrue(m.find());
assertEquals(25, m.start());
assertEquals("2020", m.group());
assertEquals(29, m.end());
assertFalse(m.find());
}
@Test
public void givenStartIndex_whenFindFourDigitWorks_thenCorrect() {
Pattern stringPattern = Pattern.compile("\\d\\d\\d\\d");
Matcher m = stringPattern.matcher("goodbye 2019 and welcome 2020");
assertTrue(m.find(20));
assertEquals(25, m.start());
assertEquals("2020", m.group());
assertEquals(29, m.end());
}
@Test
public void whenMatchFourDigitWorks_thenFail() {
Pattern stringPattern = Pattern.compile("\\d\\d\\d\\d");
Matcher m = stringPattern.matcher("goodbye 2019 and welcome 2020");
assertFalse(m.matches());
}
@Test
public void whenMatchFourDigitWorks_thenCorrect() {
Pattern stringPattern = Pattern.compile("\\d\\d\\d\\d");
Matcher m = stringPattern.matcher("2019");
assertTrue(m.matches());
assertEquals(0, m.start());
assertEquals("2019", m.group());
assertEquals(4, m.end());
assertTrue(m.matches());// matches will always return the same return
}
}