Java-1470 Split libraries module
This commit is contained in:
mikr
@@ -0,0 +1,43 @@
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package com.baeldung.fj;
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import fj.F;
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import fj.F1Functions;
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import fj.Unit;
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import fj.data.IO;
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import fj.data.IOFunctions;
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public class FunctionalJavaIOMain {
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public static IO<Unit> printLetters(final String s) {
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return () -> {
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for (int i = 0; i < s.length(); i++) {
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System.out.println(s.charAt(i));
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}
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return Unit.unit();
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};
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}
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public static void main(String[] args) {
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F<String, IO<Unit>> printLetters = i -> printLetters(i);
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IO<Unit> lowerCase = IOFunctions.stdoutPrintln("What's your first Name ?");
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IO<Unit> input = IOFunctions.stdoutPrint("First Name: ");
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IO<Unit> userInput = IOFunctions.append(lowerCase, input);
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IO<String> readInput = IOFunctions.stdinReadLine();
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F<String, String> toUpperCase = i -> i.toUpperCase();
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F<String, IO<Unit>> transformInput = F1Functions.<String, IO<Unit>, String> o(printLetters).f(toUpperCase);
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IO<Unit> readAndPrintResult = IOFunctions.bind(readInput, transformInput);
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IO<Unit> program = IOFunctions.bind(userInput, nothing -> readAndPrintResult);
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IOFunctions.toSafe(program).run();
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}
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}
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@@ -0,0 +1,48 @@
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package com.baeldung.fj;
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import fj.F;
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import fj.Show;
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import fj.data.Array;
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import fj.data.List;
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import fj.data.Option;
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import fj.function.Characters;
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import fj.function.Integers;
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public class FunctionalJavaMain {
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public static final F<Integer, Boolean> isEven = i -> i % 2 == 0;
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public static void main(String[] args) {
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List<Integer> fList = List.list(3, 4, 5, 6);
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List<Boolean> evenList = fList.map(isEven);
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Show.listShow(Show.booleanShow).println(evenList);
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fList = fList.map(i -> i + 1);
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Show.listShow(Show.intShow).println(fList);
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Array<Integer> a = Array.array(17, 44, 67, 2, 22, 80, 1, 27);
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Array<Integer> b = a.filter(Integers.even);
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Show.arrayShow(Show.intShow).println(b);
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Array<String> array = Array.array("Welcome", "To", "baeldung");
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Boolean isExist = array.exists(s -> List.fromString(s).forall(Characters.isLowerCase));
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System.out.println(isExist);
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Array<Integer> intArray = Array.array(17, 44, 67, 2, 22, 80, 1, 27);
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int sum = intArray.foldLeft(Integers.add, 0);
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System.out.println(sum);
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Option<Integer> n1 = Option.some(1);
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Option<Integer> n2 = Option.some(2);
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F<Integer, Option<Integer>> f1 = i -> i % 2 == 0 ? Option.some(i + 100) : Option.none();
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Option<Integer> result1 = n1.bind(f1);
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Option<Integer> result2 = n2.bind(f1);
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Show.optionShow(Show.intShow).println(result1);
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Show.optionShow(Show.intShow).println(result2);
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}
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}
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64
libraries-6/src/main/java/com/baeldung/ftp/FtpClient.java
Normal file
64
libraries-6/src/main/java/com/baeldung/ftp/FtpClient.java
Normal file
@@ -0,0 +1,64 @@
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package com.baeldung.ftp;
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import org.apache.commons.net.PrintCommandListener;
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import org.apache.commons.net.ftp.FTPClient;
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import org.apache.commons.net.ftp.FTPFile;
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import org.apache.commons.net.ftp.FTPReply;
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import java.io.*;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.stream.Collectors;
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class FtpClient {
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private final String server;
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private final int port;
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private final String user;
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private final String password;
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private FTPClient ftp;
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FtpClient(String server, int port, String user, String password) {
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this.server = server;
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this.port = port;
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this.user = user;
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this.password = password;
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}
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void open() throws IOException {
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ftp = new FTPClient();
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ftp.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out)));
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ftp.connect(server, port);
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int reply = ftp.getReplyCode();
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if (!FTPReply.isPositiveCompletion(reply)) {
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ftp.disconnect();
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throw new IOException("Exception in connecting to FTP Server");
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}
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ftp.login(user, password);
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}
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void close() throws IOException {
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ftp.disconnect();
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}
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Collection<String> listFiles(String path) throws IOException {
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FTPFile[] files = ftp.listFiles(path);
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return Arrays.stream(files)
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.map(FTPFile::getName)
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.collect(Collectors.toList());
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}
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void putFileToPath(File file, String path) throws IOException {
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ftp.storeFile(path, new FileInputStream(file));
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}
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void downloadFile(String source, String destination) throws IOException {
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FileOutputStream out = new FileOutputStream(destination);
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ftp.retrieveFile(source, out);
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out.close();
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}
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}
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@@ -0,0 +1,183 @@
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package com.baeldung.javapoet;
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import com.squareup.javapoet.ClassName;
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import com.squareup.javapoet.CodeBlock;
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import com.squareup.javapoet.FieldSpec;
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import com.squareup.javapoet.JavaFile;
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import com.squareup.javapoet.MethodSpec;
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import com.squareup.javapoet.ParameterSpec;
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import com.squareup.javapoet.ParameterizedTypeName;
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import com.squareup.javapoet.TypeName;
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import com.squareup.javapoet.TypeSpec;
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import javax.lang.model.element.Modifier;
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import java.io.File;
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import java.io.IOException;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.List;
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import java.util.stream.IntStream;
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public class PersonGenerator {
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private static final String FOUR_WHITESPACES = " ";
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private static final String PERSON_PACKAGE_NAME = "com.baeldung.javapoet.test.person";
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private File outputFile;
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public PersonGenerator() {
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outputFile = new File(getOutputPath().toUri());
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}
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public static String getPersonPackageName() {
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return PERSON_PACKAGE_NAME;
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}
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public Path getOutputPath() {
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return Paths.get(new File(".").getAbsolutePath() + "/gensrc");
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}
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public FieldSpec getDefaultNameField() {
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return FieldSpec
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.builder(String.class, "DEFAULT_NAME")
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.addModifiers(Modifier.PUBLIC, Modifier.STATIC, Modifier.FINAL)
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.initializer("$S", "Alice")
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.build();
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}
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public MethodSpec getSortByLengthMethod() {
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return MethodSpec
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.methodBuilder("sortByLength")
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.addModifiers(Modifier.PUBLIC, Modifier.STATIC)
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.addParameter(ParameterSpec
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.builder(ParameterizedTypeName.get(ClassName.get(List.class), TypeName.get(String.class)), "strings")
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.build())
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.addStatement("$T.sort($N, $L)", Collections.class, "strings", getComparatorAnonymousClass())
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.build();
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}
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public MethodSpec getPrintNameMultipleTimesMethod() {
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return MethodSpec
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.methodBuilder("printNameMultipleTimes")
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.addModifiers(Modifier.PUBLIC)
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.addCode(getPrintNameMultipleTimesLambdaImpl())
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.build();
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}
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public CodeBlock getPrintNameMultipleTimesImpl() {
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return CodeBlock
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.builder()
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.beginControlFlow("for (int i = $L; i < $L; i++)")
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.addStatement("System.out.println(name)")
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.endControlFlow()
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.build();
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}
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public CodeBlock getPrintNameMultipleTimesLambdaImpl() {
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return CodeBlock
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.builder()
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.addStatement("$T<$T> names = new $T<>()", List.class, String.class, ArrayList.class)
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.addStatement("$T.range($L, $L).forEach(i -> names.add(name))", IntStream.class, 0, 10)
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.addStatement("names.forEach(System.out::println)")
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.build();
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}
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public TypeSpec getGenderEnum() {
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return TypeSpec
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.enumBuilder("Gender")
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.addModifiers(Modifier.PUBLIC)
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.addEnumConstant("MALE")
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.addEnumConstant("FEMALE")
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.addEnumConstant("UNSPECIFIED")
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.build();
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}
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public TypeSpec getPersonInterface() {
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return TypeSpec
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.interfaceBuilder("Person")
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.addModifiers(Modifier.PUBLIC)
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.addField(getDefaultNameField())
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.addMethod(MethodSpec
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.methodBuilder("getName")
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.addModifiers(Modifier.PUBLIC, Modifier.ABSTRACT)
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.returns(String.class)
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.build())
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.addMethod(MethodSpec
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.methodBuilder("getDefaultName")
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.addModifiers(Modifier.PUBLIC, Modifier.DEFAULT)
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.returns(String.class)
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.addCode(CodeBlock
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.builder()
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.addStatement("return DEFAULT_NAME")
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.build())
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.build())
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.build();
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}
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public TypeSpec getStudentClass() {
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return TypeSpec
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.classBuilder("Student")
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.addSuperinterface(ClassName.get(PERSON_PACKAGE_NAME, "Person"))
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.addModifiers(Modifier.PUBLIC)
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.addField(FieldSpec
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.builder(String.class, "name")
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.addModifiers(Modifier.PRIVATE)
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.build())
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.addMethod(MethodSpec
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.methodBuilder("getName")
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.addAnnotation(Override.class)
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.addModifiers(Modifier.PUBLIC)
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.returns(String.class)
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.addStatement("return this.name")
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.build())
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.addMethod(MethodSpec
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.methodBuilder("setName")
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.addParameter(String.class, "name")
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.addModifiers(Modifier.PUBLIC)
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.addStatement("this.name = name")
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.build())
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.addMethod(getPrintNameMultipleTimesMethod())
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.addMethod(getSortByLengthMethod())
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.build();
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}
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public TypeSpec getComparatorAnonymousClass() {
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return TypeSpec
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.anonymousClassBuilder("")
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.addSuperinterface(ParameterizedTypeName.get(Comparator.class, String.class))
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.addMethod(MethodSpec
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.methodBuilder("compare")
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.addModifiers(Modifier.PUBLIC)
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.addAnnotation(Override.class)
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.addParameter(String.class, "a")
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.addParameter(String.class, "b")
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.returns(int.class)
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.addStatement("return a.length() - b.length()")
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.build())
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.build();
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}
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public void generateGenderEnum() throws IOException {
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writeToOutputFile(getPersonPackageName(), getGenderEnum());
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}
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public void generatePersonInterface() throws IOException {
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writeToOutputFile(getPersonPackageName(), getPersonInterface());
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}
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public void generateStudentClass() throws IOException {
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writeToOutputFile(getPersonPackageName(), getStudentClass());
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}
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private void writeToOutputFile(String packageName, TypeSpec typeSpec) throws IOException {
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JavaFile javaFile = JavaFile
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.builder(packageName, typeSpec)
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.indent(FOUR_WHITESPACES)
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.build();
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javaFile.writeTo(outputFile);
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}
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}
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@@ -0,0 +1,56 @@
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package com.baeldung.kafka;
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import org.apache.kafka.clients.producer.KafkaProducer;
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import org.apache.kafka.clients.producer.ProducerRecord;
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import org.apache.kafka.common.KafkaException;
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import java.util.Properties;
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import java.util.stream.Stream;
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import static org.apache.kafka.clients.consumer.ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG;
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import static org.apache.kafka.clients.producer.ProducerConfig.ENABLE_IDEMPOTENCE_CONFIG;
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import static org.apache.kafka.clients.producer.ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG;
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import static org.apache.kafka.clients.producer.ProducerConfig.TRANSACTIONAL_ID_CONFIG;
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import static org.apache.kafka.clients.producer.ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG;
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public class TransactionalMessageProducer {
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private static final String DATA_MESSAGE_1 = "Put any space separated data here for count";
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private static final String DATA_MESSAGE_2 = "Output will contain count of every word in the message";
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public static void main(String[] args) {
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KafkaProducer<String, String> producer = createKafkaProducer();
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producer.initTransactions();
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try{
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producer.beginTransaction();
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Stream.of(DATA_MESSAGE_1, DATA_MESSAGE_2).forEach(s -> producer.send(
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new ProducerRecord<String, String>("input", null, s)));
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producer.commitTransaction();
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}catch (KafkaException e){
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producer.abortTransaction();
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}
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}
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private static KafkaProducer<String, String> createKafkaProducer() {
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Properties props = new Properties();
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props.put(BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
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props.put(ENABLE_IDEMPOTENCE_CONFIG, "true");
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props.put(TRANSACTIONAL_ID_CONFIG, "prod-0");
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props.put(KEY_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
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props.put(VALUE_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
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return new KafkaProducer(props);
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}
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}
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@@ -0,0 +1,105 @@
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package com.baeldung.kafka;
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import org.apache.kafka.clients.consumer.ConsumerRecord;
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import org.apache.kafka.clients.consumer.ConsumerRecords;
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import org.apache.kafka.clients.consumer.KafkaConsumer;
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import org.apache.kafka.clients.consumer.OffsetAndMetadata;
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import org.apache.kafka.clients.producer.KafkaProducer;
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import org.apache.kafka.clients.producer.ProducerConfig;
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import org.apache.kafka.clients.producer.ProducerRecord;
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import org.apache.kafka.common.KafkaException;
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import org.apache.kafka.common.TopicPartition;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Properties;
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import java.util.stream.Collectors;
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import java.util.stream.Stream;
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import static java.time.Duration.ofSeconds;
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import static java.util.Collections.singleton;
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import static org.apache.kafka.clients.consumer.ConsumerConfig.*;
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import static org.apache.kafka.clients.consumer.ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG;
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import static org.apache.kafka.clients.producer.ProducerConfig.*;
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public class TransactionalWordCount {
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private static final String CONSUMER_GROUP_ID = "my-group-id";
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private static final String OUTPUT_TOPIC = "output";
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private static final String INPUT_TOPIC = "input";
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public static void main(String[] args) {
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KafkaConsumer<String, String> consumer = createKafkaConsumer();
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KafkaProducer<String, String> producer = createKafkaProducer();
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producer.initTransactions();
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try {
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while (true) {
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ConsumerRecords<String, String> records = consumer.poll(ofSeconds(60));
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Map<String, Integer> wordCountMap = records.records(new TopicPartition(INPUT_TOPIC, 0))
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.stream()
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.flatMap(record -> Stream.of(record.value().split(" ")))
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.map(word -> Tuple.of(word, 1))
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.collect(Collectors.toMap(tuple -> tuple.getKey(), t1 -> t1.getValue(), (v1, v2) -> v1 + v2));
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producer.beginTransaction();
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wordCountMap.forEach((key, value) -> producer.send(new ProducerRecord<String, String>(OUTPUT_TOPIC, key, value.toString())));
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Map<TopicPartition, OffsetAndMetadata> offsetsToCommit = new HashMap<>();
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for (TopicPartition partition : records.partitions()) {
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List<ConsumerRecord<String, String>> partitionedRecords = records.records(partition);
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long offset = partitionedRecords.get(partitionedRecords.size() - 1).offset();
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offsetsToCommit.put(partition, new OffsetAndMetadata(offset + 1));
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}
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producer.sendOffsetsToTransaction(offsetsToCommit, CONSUMER_GROUP_ID);
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producer.commitTransaction();
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}
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} catch (KafkaException e) {
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producer.abortTransaction();
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}
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||||
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}
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private static KafkaConsumer<String, String> createKafkaConsumer() {
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Properties props = new Properties();
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props.put(BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
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props.put(GROUP_ID_CONFIG, CONSUMER_GROUP_ID);
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props.put(ENABLE_AUTO_COMMIT_CONFIG, "false");
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props.put(ISOLATION_LEVEL_CONFIG, "read_committed");
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||||
props.put(KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
|
||||
props.put(VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
|
||||
|
||||
KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
|
||||
consumer.subscribe(singleton(INPUT_TOPIC));
|
||||
return consumer;
|
||||
}
|
||||
|
||||
private static KafkaProducer<String, String> createKafkaProducer() {
|
||||
|
||||
Properties props = new Properties();
|
||||
props.put(BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
|
||||
props.put(ENABLE_IDEMPOTENCE_CONFIG, "true");
|
||||
props.put(TRANSACTIONAL_ID_CONFIG, "prod-1");
|
||||
props.put(KEY_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
|
||||
props.put(VALUE_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
|
||||
|
||||
return new KafkaProducer(props);
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
24
libraries-6/src/main/java/com/baeldung/kafka/Tuple.java
Normal file
24
libraries-6/src/main/java/com/baeldung/kafka/Tuple.java
Normal file
@@ -0,0 +1,24 @@
|
||||
package com.baeldung.kafka;
|
||||
|
||||
public class Tuple {
|
||||
|
||||
private String key;
|
||||
private Integer value;
|
||||
|
||||
private Tuple(String key, Integer value) {
|
||||
this.key = key;
|
||||
this.value = value;
|
||||
}
|
||||
|
||||
public static Tuple of(String key, Integer value){
|
||||
return new Tuple(key,value);
|
||||
}
|
||||
|
||||
public String getKey() {
|
||||
return key;
|
||||
}
|
||||
|
||||
public Integer getValue() {
|
||||
return value;
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,71 @@
|
||||
package com.baeldung.reflections;
|
||||
|
||||
import java.lang.reflect.Constructor;
|
||||
import java.lang.reflect.Method;
|
||||
import java.util.Date;
|
||||
import java.util.Set;
|
||||
import java.util.regex.Pattern;
|
||||
|
||||
import org.reflections.Reflections;
|
||||
import org.reflections.scanners.MethodAnnotationsScanner;
|
||||
import org.reflections.scanners.MethodParameterScanner;
|
||||
import org.reflections.scanners.ResourcesScanner;
|
||||
import org.reflections.scanners.Scanner;
|
||||
import org.reflections.scanners.SubTypesScanner;
|
||||
import org.reflections.util.ClasspathHelper;
|
||||
import org.reflections.util.ConfigurationBuilder;
|
||||
|
||||
public class ReflectionsApp {
|
||||
|
||||
public Set<Class<? extends Scanner>> getReflectionsSubTypes() {
|
||||
Reflections reflections = new Reflections("org.reflections");
|
||||
Set<Class<? extends Scanner>> scannersSet = reflections.getSubTypesOf(Scanner.class);
|
||||
return scannersSet;
|
||||
}
|
||||
|
||||
public Set<Class<?>> getJDKFunctinalInterfaces() {
|
||||
Reflections reflections = new Reflections("java.util.function");
|
||||
Set<Class<?>> typesSet = reflections.getTypesAnnotatedWith(FunctionalInterface.class);
|
||||
return typesSet;
|
||||
}
|
||||
|
||||
public Set<Method> getDateDeprecatedMethods() {
|
||||
Reflections reflections = new Reflections(java.util.Date.class, new MethodAnnotationsScanner());
|
||||
Set<Method> deprecatedMethodsSet = reflections.getMethodsAnnotatedWith(Deprecated.class);
|
||||
return deprecatedMethodsSet;
|
||||
}
|
||||
|
||||
@SuppressWarnings("rawtypes")
|
||||
public Set<Constructor> getDateDeprecatedConstructors() {
|
||||
Reflections reflections = new Reflections(java.util.Date.class, new MethodAnnotationsScanner());
|
||||
Set<Constructor> constructorsSet = reflections.getConstructorsAnnotatedWith(Deprecated.class);
|
||||
return constructorsSet;
|
||||
}
|
||||
|
||||
public Set<Method> getMethodsWithDateParam() {
|
||||
Reflections reflections = new Reflections(java.text.SimpleDateFormat.class, new MethodParameterScanner());
|
||||
Set<Method> methodsSet = reflections.getMethodsMatchParams(Date.class);
|
||||
return methodsSet;
|
||||
}
|
||||
|
||||
public Set<Method> getMethodsWithVoidReturn() {
|
||||
Reflections reflections = new Reflections(java.text.SimpleDateFormat.class, new MethodParameterScanner());
|
||||
Set<Method> methodsSet = reflections.getMethodsReturn(void.class);
|
||||
return methodsSet;
|
||||
}
|
||||
|
||||
public Set<String> getPomXmlPaths() {
|
||||
Reflections reflections = new Reflections(new ResourcesScanner());
|
||||
Set<String> resourcesSet = reflections.getResources(Pattern.compile(".*pom\\.xml"));
|
||||
return resourcesSet;
|
||||
}
|
||||
|
||||
public Set<Class<? extends Scanner>> getReflectionsSubTypesUsingBuilder() {
|
||||
Reflections reflections = new Reflections(new ConfigurationBuilder().setUrls(ClasspathHelper.forPackage("org.reflections"))
|
||||
.setScanners(new SubTypesScanner()));
|
||||
|
||||
Set<Class<? extends Scanner>> scannersSet = reflections.getSubTypesOf(Scanner.class);
|
||||
return scannersSet;
|
||||
}
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user