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first working example with use case and persistence adapter

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This commit is contained in:
Tom Hombergs
2019-05-08 23:12:17 +02:00
commit 1f6852e5b7
26 changed files with 720 additions and 0 deletions
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30
.gitignore vendored Normal file
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HELP.md
.gradle
/build/
!gradle/wrapper/gradle-wrapper.jar
### STS ###
.apt_generated
.classpath
.factorypath
.project
.settings
.springBeans
.sts4-cache
### IntelliJ IDEA ###
.idea
*.iws
*.iml
*.ipr
/out/
### NetBeans ###
/nbproject/private/
/nbbuild/
/dist/
/nbdist/
/.nb-gradle/
### VS Code ###
.vscode/

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build.gradle Normal file
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plugins {
id 'org.springframework.boot' version '2.1.4.RELEASE'
id 'java'
}
apply plugin: 'io.spring.dependency-management'
group = 'io.reflectoring'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'
configurations {
compileOnly {
extendsFrom annotationProcessor
}
}
repositories {
mavenCentral()
}
dependencies {
implementation 'org.springframework.boot:spring-boot-starter-web'
implementation 'org.springframework.boot:spring-boot-starter-data-jdbc'
compileOnly 'org.projectlombok:lombok'
runtimeOnly 'com.h2database:h2'
annotationProcessor 'org.projectlombok:lombok'
testImplementation('org.springframework.boot:spring-boot-starter-test') {
exclude group: 'junit' // excluding junit 4
}
testImplementation 'org.junit.jupiter:junit-jupiter-engine:5.0.1'
testImplementation 'org.mockito:mockito-junit-jupiter:2.23.0'
testImplementation 'com.tngtech.archunit:archunit:0.9.3'
}
test {
useJUnitPlatform()
}

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#!/usr/bin/env sh
##############################################################################
##
## Gradle start up script for UN*X
##
##############################################################################
# Attempt to set APP_HOME
# Resolve links: $0 may be a link
PRG="$0"
# Need this for relative symlinks.
while [ -h "$PRG" ] ; do
ls=`ls -ld "$PRG"`
link=`expr "$ls" : '.*-> \(.*\)$'`
if expr "$link" : '/.*' > /dev/null; then
PRG="$link"
else
PRG=`dirname "$PRG"`"/$link"
fi
done
SAVED="`pwd`"
cd "`dirname \"$PRG\"`/" >/dev/null
APP_HOME="`pwd -P`"
cd "$SAVED" >/dev/null
APP_NAME="Gradle"
APP_BASE_NAME=`basename "$0"`
# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS='"-Xmx64m"'
# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD="maximum"
warn () {
echo "$*"
}
die () {
echo
echo "$*"
echo
exit 1
}
# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "`uname`" in
CYGWIN* )
cygwin=true
;;
Darwin* )
darwin=true
;;
MINGW* )
msys=true
;;
NONSTOP* )
nonstop=true
;;
esac
CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
# IBM's JDK on AIX uses strange locations for the executables
JAVACMD="$JAVA_HOME/jre/sh/java"
else
JAVACMD="$JAVA_HOME/bin/java"
fi
if [ ! -x "$JAVACMD" ] ; then
die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
else
JAVACMD="java"
which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
# Increase the maximum file descriptors if we can.
if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
MAX_FD_LIMIT=`ulimit -H -n`
if [ $? -eq 0 ] ; then
if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
MAX_FD="$MAX_FD_LIMIT"
fi
ulimit -n $MAX_FD
if [ $? -ne 0 ] ; then
warn "Could not set maximum file descriptor limit: $MAX_FD"
fi
else
warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
fi
fi
# For Darwin, add options to specify how the application appears in the dock
if $darwin; then
GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
fi
# For Cygwin, switch paths to Windows format before running java
if $cygwin ; then
APP_HOME=`cygpath --path --mixed "$APP_HOME"`
CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
JAVACMD=`cygpath --unix "$JAVACMD"`
# We build the pattern for arguments to be converted via cygpath
ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
SEP=""
for dir in $ROOTDIRSRAW ; do
ROOTDIRS="$ROOTDIRS$SEP$dir"
SEP="|"
done
OURCYGPATTERN="(^($ROOTDIRS))"
# Add a user-defined pattern to the cygpath arguments
if [ "$GRADLE_CYGPATTERN" != "" ] ; then
OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
fi
# Now convert the arguments - kludge to limit ourselves to /bin/sh
i=0
for arg in "$@" ; do
CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
else
eval `echo args$i`="\"$arg\""
fi
i=$((i+1))
done
case $i in
(0) set -- ;;
(1) set -- "$args0" ;;
(2) set -- "$args0" "$args1" ;;
(3) set -- "$args0" "$args1" "$args2" ;;
(4) set -- "$args0" "$args1" "$args2" "$args3" ;;
(5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
(6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
(7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
(8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
(9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
esac
fi
# Escape application args
save () {
for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
echo " "
}
APP_ARGS=$(save "$@")
# Collect all arguments for the java command, following the shell quoting and substitution rules
eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
cd "$(dirname "$0")"
fi
exec "$JAVACMD" "$@"

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@if "%DEBUG%" == "" @echo off
@rem ##########################################################################
@rem
@rem Gradle startup script for Windows
@rem
@rem ##########################################################################
@rem Set local scope for the variables with windows NT shell
if "%OS%"=="Windows_NT" setlocal
set DIRNAME=%~dp0
if "%DIRNAME%" == "" set DIRNAME=.
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS="-Xmx64m"
@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome
set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if "%ERRORLEVEL%" == "0" goto init
echo.
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
if exist "%JAVA_EXE%" goto init
echo.
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:init
@rem Get command-line arguments, handling Windows variants
if not "%OS%" == "Windows_NT" goto win9xME_args
:win9xME_args
@rem Slurp the command line arguments.
set CMD_LINE_ARGS=
set _SKIP=2
:win9xME_args_slurp
if "x%~1" == "x" goto execute
set CMD_LINE_ARGS=%*
:execute
@rem Setup the command line
set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
:end
@rem End local scope for the variables with windows NT shell
if "%ERRORLEVEL%"=="0" goto mainEnd
:fail
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
rem the _cmd.exe /c_ return code!
if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
exit /b 1
:mainEnd
if "%OS%"=="Windows_NT" endlocal
:omega

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pluginManagement {
repositories {
gradlePluginPortal()
}
}
rootProject.name = 'clean-architecture-example'

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src/main/java/io/reflectoring/reviewapp/BookReviewerApplication.java Normal file
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package io.reflectoring.reviewapp;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.data.jdbc.repository.config.EnableJdbcRepositories;
@SpringBootApplication
public class BookReviewerApplication {
public static void main(String[] args) {
SpringApplication.run(BookReviewerApplication.class, args);
}
}

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src/main/java/io/reflectoring/reviewapp/adapter/persistence/AuthorPersistenceAdapter.java Normal file
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package io.reflectoring.reviewapp.adapter.persistence;
import io.reflectoring.reviewapp.application.port.out.FindAuthorByIdPort;
import io.reflectoring.reviewapp.domain.Author;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Component;
@Component
@RequiredArgsConstructor
class AuthorPersistenceAdapter implements FindAuthorByIdPort {
private final AuthorRepository authorRepository;
@Override
public Author findAuthorById(Long authorId) {
return authorRepository.findById(authorId)
.orElseThrow(() -> new AuthorNotFoundException(authorId));
}
}

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src/main/java/io/reflectoring/reviewapp/adapter/persistence/AuthorRepository.java Normal file
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package io.reflectoring.reviewapp.adapter.persistence;
import io.reflectoring.reviewapp.domain.Author;
import org.springframework.data.repository.CrudRepository;
public interface AuthorRepository extends CrudRepository<Author, Long> {
}

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src/main/java/io/reflectoring/reviewapp/adapter/persistence/BookPersistenceAdapter.java Normal file
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package io.reflectoring.reviewapp.adapter.persistence;
import io.reflectoring.reviewapp.application.port.out.FindBookByTitlePort;
import io.reflectoring.reviewapp.application.port.out.PersistBookPort;
import io.reflectoring.reviewapp.domain.Book;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Component;
import java.util.Optional;
@Component
@RequiredArgsConstructor
class BookPersistenceAdapter implements FindBookByTitlePort, PersistBookPort {
private final BookRepository bookRepository;
@Override
public Optional<Book> findBookByTitle(String title) {
return bookRepository.findByTitle(title);
}
@Override
public Book saveBook(Book book) {
return bookRepository.save(book);
}
}

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src/main/java/io/reflectoring/reviewapp/adapter/persistence/BookRepository.java Normal file
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package io.reflectoring.reviewapp.adapter.persistence;
import io.reflectoring.reviewapp.domain.Book;
import org.springframework.data.jdbc.repository.query.Query;
import org.springframework.data.repository.CrudRepository;
import org.springframework.data.repository.query.Param;
import java.util.Optional;
interface BookRepository extends CrudRepository<Book, Long> {
@Query("select b.* from Book b where b.title = :title")
Optional<Book> findByTitle(@Param("title") String title);
}

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src/main/java/io/reflectoring/reviewapp/adapter/persistence/PersistenceAdapterConfiguration.java Normal file
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package io.reflectoring.reviewapp.adapter.persistence;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jdbc.repository.config.EnableJdbcRepositories;
import org.springframework.data.jdbc.repository.config.JdbcConfiguration;
@Configuration
@EnableJdbcRepositories
@ComponentScan
class PersistenceAdapterConfiguration extends JdbcConfiguration {
}

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src/main/java/io/reflectoring/reviewapp/application/port/in/RegisterBookUseCase.java Normal file
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package io.reflectoring.reviewapp.application.port.in;
import io.reflectoring.reviewapp.common.SelfValidating;
import lombok.Getter;
import javax.validation.constraints.NotEmpty;
import javax.validation.constraints.NotNull;
public interface RegisterBookUseCase {
/**
* Allows an author to register a new book to be reviewed.
*/
void registerBook(RegisterBookCommand command) throws NonUniqueBookTitleException;
@Getter
final class RegisterBookCommand extends SelfValidating<RegisterBookCommand> {
@NotEmpty
private final String bookTitle;
@NotNull
private final Long authorId;
public RegisterBookCommand(String bookTitle, Long authorId) {
this.bookTitle = bookTitle;
this.authorId = authorId;
validateSelf();
}
}
final class NonUniqueBookTitleException extends RuntimeException {
public NonUniqueBookTitleException(String bookTitle) {
super(String.format("A book title must be unique (book title in question: '%s').", bookTitle));
}
}
}

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src/main/java/io/reflectoring/reviewapp/application/port/out/FindAuthorByIdPort.java Normal file
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package io.reflectoring.reviewapp.application.port.out;
import io.reflectoring.reviewapp.domain.Author;
public interface FindAuthorByIdPort {
Author findAuthorById(Long authorId) throws AuthorNotFoundException;
class AuthorNotFoundException extends RuntimeException {
public AuthorNotFoundException(Long authorId) {
super(String.format("Author with ID '%d' does not exist!", authorId));
}
}
}

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src/main/java/io/reflectoring/reviewapp/application/port/out/FindBookByTitlePort.java Normal file
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package io.reflectoring.reviewapp.application.port.out;
import io.reflectoring.reviewapp.domain.Book;
import java.util.Optional;
public interface FindBookByTitlePort {
Optional<Book> findBookByTitle(String title);
}

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src/main/java/io/reflectoring/reviewapp/application/port/out/PersistBookPort.java Normal file
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package io.reflectoring.reviewapp.application.port.out;
import io.reflectoring.reviewapp.domain.Book;
public interface PersistBookPort {
Book saveBook(Book book);
}

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src/main/java/io/reflectoring/reviewapp/application/service/RegisterBookService.java Normal file
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package io.reflectoring.reviewapp.application.service;
import io.reflectoring.reviewapp.application.port.in.RegisterBookUseCase;
import io.reflectoring.reviewapp.application.port.out.FindAuthorByIdPort;
import io.reflectoring.reviewapp.application.port.out.FindBookByTitlePort;
import io.reflectoring.reviewapp.application.port.out.PersistBookPort;
import io.reflectoring.reviewapp.domain.Author;
import io.reflectoring.reviewapp.domain.Book;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
@Service
@RequiredArgsConstructor
public class RegisterBookService implements RegisterBookUseCase {
private final FindAuthorByIdPort findAuthorByIdPort;
private final FindBookByTitlePort findBookByTitlePort;
private final PersistBookPort saveBookPort;
@Override
public void registerBook(RegisterBookCommand command) {
Author author = findAuthorByIdPort.findAuthorById(command.getAuthorId());
requireUniqueTitle(command.getBookTitle());
requireAuthorHasPremiumAccount(author);
// more business validations ...
Book book = new Book(null, command.getBookTitle(), author.getId());
saveBookPort.saveBook(book);
}
private void requireAuthorHasPremiumAccount(Author author) {
// some business validation ...
}
private void requireUniqueTitle(String bookTitle) {
if (findBookByTitlePort.findBookByTitle(bookTitle).isPresent()) {
throw new NonUniqueBookTitleException(bookTitle);
}
}
}

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src/main/java/io/reflectoring/reviewapp/common/SelfValidating.java Normal file
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package io.reflectoring.reviewapp.common;
import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import java.util.Set;
public abstract class SelfValidating<T> {
private Validator validator;
public SelfValidating() {
ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
validator = factory.getValidator();
}
/**
* Evaluates all Bean Validations on the attributes of this
* instance.
*/
protected void validateSelf() {
Set<ConstraintViolation<T>> violations = validator.validate((T) this);
if (!violations.isEmpty()) {
throw new ConstraintViolationException(violations);
}
}
}

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src/main/java/io/reflectoring/reviewapp/domain/Author.java Normal file
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package io.reflectoring.reviewapp.domain;
import lombok.AllArgsConstructor;
import lombok.Getter;
import org.springframework.data.annotation.Id;
import org.springframework.data.relational.core.mapping.Column;
@Getter
@AllArgsConstructor
public class Author {
@Id
private Long id;
private String name;
}

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src/main/java/io/reflectoring/reviewapp/domain/Book.java Normal file
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package io.reflectoring.reviewapp.domain;
import lombok.AllArgsConstructor;
import lombok.Getter;
import org.springframework.data.annotation.Id;
@Getter
@AllArgsConstructor
public class Book {
@Id
private Long id;
private String title;
private Long authorId;
// imagine some insanely complex business logic methods ...
}

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src/main/resources/application.properties Normal file
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logging.level.org.springframework.jdbc.core.JdbcTemplate=DEBUG

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src/main/resources/io/reflectoring/reviewapp/adapter/persistence/single-book-reset.sql Normal file
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DELETE FROM AUTHOR WHERE ID = 42;
DELETE FROM BOOK WHERE ID = 1;

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src/main/resources/io/reflectoring/reviewapp/adapter/persistence/single-book.sql Normal file
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INSERT INTO AUTHOR (ID, NAME)
VALUES (42, 'Tom');
INSERT INTO BOOK (ID, TITLE, AUTHOR_ID)
VALUES (1, 'Get Your Hands Dirty on Clean Architecture', 42);

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src/main/resources/schema.sql Normal file
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CREATE TABLE BOOK
(
id BIGINT auto_increment NOT NULL,
title VARCHAR(50) NOT NULL,
author_id BIGINT NOT NULL
);
CREATE TABLE AUTHOR
(
id BIGINT auto_increment NOT NULL,
name VARCHAR(50) NOT NULL
);

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src/test/java/io/reflectoring/reviewapp/BookReviewerApplicationTests.java Normal file
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package io.reflectoring.reviewapp;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit.jupiter.SpringExtension;
@ExtendWith(SpringExtension.class)
@SpringBootTest
class BookReviewerApplicationTests {
@Test
void contextLoads() {
}
}

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src/test/java/io/reflectoring/reviewapp/adapter/persistence/BookPersistenceAdapterTest.java Normal file
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package io.reflectoring.reviewapp.adapter.persistence;
import io.reflectoring.reviewapp.domain.Book;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.jdbc.Sql;
import org.springframework.test.context.jdbc.Sql.ExecutionPhase;
import org.springframework.test.context.jdbc.SqlGroup;
import java.util.Optional;
import static org.assertj.core.api.Assertions.*;
@SpringBootTest
class BookPersistenceAdapterTest {
@Autowired
private BookPersistenceAdapter bookPersistenceAdapter;
@Autowired
private BookRepository bookRepository;
@Test
@SqlGroup({
@Sql(scripts = "single-book.sql", executionPhase = ExecutionPhase.BEFORE_TEST_METHOD),
@Sql(scripts = "single-book-reset.sql", executionPhase = ExecutionPhase.AFTER_TEST_METHOD)})
void findBookByTitle() {
Optional<Book> optionalBook = bookPersistenceAdapter.findBookByTitle("Get Your Hands Dirty on Clean Architecture");
assertThat(optionalBook).isPresent();
}
@Test
@SqlGroup({
@Sql(scripts = "single-book.sql", executionPhase = ExecutionPhase.BEFORE_TEST_METHOD),
@Sql(scripts = "single-book-reset.sql", executionPhase = ExecutionPhase.AFTER_TEST_METHOD)})
void savesBook() {
Book book = new Book(null, "A Hitchhiker's Guide to the Galaxy", 42L);
Book savedBook = bookPersistenceAdapter.saveBook(book);
assertThat(bookRepository.findById(savedBook.getId())).isPresent();
}
}

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src/test/java/io/reflectoring/reviewapp/application/port/in/RegisterBookCommandTests.java Normal file
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package io.reflectoring.reviewapp.application.port.in;
import io.reflectoring.reviewapp.application.port.in.RegisterBookUseCase.RegisterBookCommand;
import org.junit.jupiter.api.Test;
import javax.validation.ConstraintViolationException;
import static org.assertj.core.api.AssertionsForClassTypes.*;
class RegisterBookCommandTests {
@Test
void acceptsValidParameters() {
new RegisterBookCommand("Get Your Hands Dirty on Clean Architecture", 42L);
// no exception
}
@Test
void rejectsEmptyTitle() {
assertThatThrownBy(() -> new RegisterBookCommand("", 42L))
.isInstanceOf(ConstraintViolationException.class);
assertThatThrownBy(() -> new RegisterBookCommand(null, 42L))
.isInstanceOf(ConstraintViolationException.class);
}
@Test
void rejectsEmptyAuthor() {
assertThatThrownBy(() -> new RegisterBookCommand("Get Your Hands Dirty on Clean Architecture", null))
.isInstanceOf(ConstraintViolationException.class);
}
}