diff --git a/my-framework/di-practice/build.gradle b/my-framework/di-practice/build.gradle new file mode 100644 index 00000000..5ec700c4 --- /dev/null +++ b/my-framework/di-practice/build.gradle @@ -0,0 +1,23 @@ +plugins { + id 'java' +} + +group 'org.example' +version '1.0-SNAPSHOT' + +repositories { + mavenCentral() +} + +dependencies { + implementation 'org.reflections:reflections:0.10.2' + + testImplementation 'org.assertj:assertj-core:3.22.0' + + testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1' + testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1' +} + +test { + useJUnitPlatform() +} \ No newline at end of file diff --git a/my-framework/di-practice/gradle/wrapper/gradle-wrapper.jar b/my-framework/di-practice/gradle/wrapper/gradle-wrapper.jar new file mode 100644 index 00000000..41d9927a Binary files /dev/null and b/my-framework/di-practice/gradle/wrapper/gradle-wrapper.jar differ diff --git a/my-framework/di-practice/gradle/wrapper/gradle-wrapper.properties b/my-framework/di-practice/gradle/wrapper/gradle-wrapper.properties new file mode 100644 index 00000000..41dfb879 --- /dev/null +++ b/my-framework/di-practice/gradle/wrapper/gradle-wrapper.properties @@ -0,0 +1,5 @@ +distributionBase=GRADLE_USER_HOME +distributionPath=wrapper/dists +distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-bin.zip +zipStoreBase=GRADLE_USER_HOME +zipStorePath=wrapper/dists diff --git a/my-framework/di-practice/gradlew b/my-framework/di-practice/gradlew new file mode 100644 index 00000000..1b6c7873 --- /dev/null +++ b/my-framework/di-practice/gradlew @@ -0,0 +1,234 @@ +#!/bin/sh + +# +# Copyright © 2015-2021 the original authors. +# +# Licensed 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 +# +# https://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. +# + +############################################################################## +# +# Gradle start up script for POSIX generated by Gradle. +# +# Important for running: +# +# (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is +# noncompliant, but you have some other compliant shell such as ksh or +# bash, then to run this script, type that shell name before the whole +# command line, like: +# +# ksh Gradle +# +# Busybox and similar reduced shells will NOT work, because this script +# requires all of these POSIX shell features: +# * functions; +# * expansions «$var», «${var}», «${var:-default}», «${var+SET}», +# «${var#prefix}», «${var%suffix}», and «$( cmd )»; +# * compound commands having a testable exit status, especially «case»; +# * various built-in commands including «command», «set», and «ulimit». +# +# Important for patching: +# +# (2) This script targets any POSIX shell, so it avoids extensions provided +# by Bash, Ksh, etc; in particular arrays are avoided. +# +# The "traditional" practice of packing multiple parameters into a +# space-separated string is a well documented source of bugs and security +# problems, so this is (mostly) avoided, by progressively accumulating +# options in "$@", and eventually passing that to Java. +# +# Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS, +# and GRADLE_OPTS) rely on word-splitting, this is performed explicitly; +# see the in-line comments for details. +# +# There are tweaks for specific operating systems such as AIX, CygWin, +# Darwin, MinGW, and NonStop. +# +# (3) This script is generated from the Groovy template +# https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt +# within the Gradle project. +# +# You can find Gradle at https://github.com/gradle/gradle/. +# +############################################################################## + +# Attempt to set APP_HOME + +# Resolve links: $0 may be a link +app_path=$0 + +# Need this for daisy-chained symlinks. +while + APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path + [ -h "$app_path" ] +do + ls=$( ls -ld "$app_path" ) + link=${ls#*' -> '} + case $link in #( + /*) app_path=$link ;; #( + *) app_path=$APP_HOME$link ;; + esac +done + +APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit + +APP_NAME="Gradle" +APP_BASE_NAME=${0##*/} + +# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' + +# Use the maximum available, or set MAX_FD != -1 to use that value. +MAX_FD=maximum + +warn () { + echo "$*" +} >&2 + +die () { + echo + echo "$*" + echo + exit 1 +} >&2 + +# OS specific support (must be 'true' or 'false'). +cygwin=false +msys=false +darwin=false +nonstop=false +case "$( uname )" in #( + CYGWIN* ) cygwin=true ;; #( + Darwin* ) darwin=true ;; #( + MSYS* | 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" && ! "$darwin" && ! "$nonstop" ; then + case $MAX_FD in #( + max*) + MAX_FD=$( ulimit -H -n ) || + warn "Could not query maximum file descriptor limit" + esac + case $MAX_FD in #( + '' | soft) :;; #( + *) + ulimit -n "$MAX_FD" || + warn "Could not set maximum file descriptor limit to $MAX_FD" + esac +fi + +# Collect all arguments for the java command, stacking in reverse order: +# * args from the command line +# * the main class name +# * -classpath +# * -D...appname settings +# * --module-path (only if needed) +# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables. + +# For Cygwin or MSYS, switch paths to Windows format before running java +if "$cygwin" || "$msys" ; then + APP_HOME=$( cygpath --path --mixed "$APP_HOME" ) + CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" ) + + JAVACMD=$( cygpath --unix "$JAVACMD" ) + + # Now convert the arguments - kludge to limit ourselves to /bin/sh + for arg do + if + case $arg in #( + -*) false ;; # don't mess with options #( + /?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath + [ -e "$t" ] ;; #( + *) false ;; + esac + then + arg=$( cygpath --path --ignore --mixed "$arg" ) + fi + # Roll the args list around exactly as many times as the number of + # args, so each arg winds up back in the position where it started, but + # possibly modified. + # + # NB: a `for` loop captures its iteration list before it begins, so + # changing the positional parameters here affects neither the number of + # iterations, nor the values presented in `arg`. + shift # remove old arg + set -- "$@" "$arg" # push replacement arg + done +fi + +# Collect all arguments for the java command; +# * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of +# shell script including quotes and variable substitutions, so put them in +# double quotes to make sure that they get re-expanded; and +# * put everything else in single quotes, so that it's not re-expanded. + +set -- \ + "-Dorg.gradle.appname=$APP_BASE_NAME" \ + -classpath "$CLASSPATH" \ + org.gradle.wrapper.GradleWrapperMain \ + "$@" + +# Use "xargs" to parse quoted args. +# +# With -n1 it outputs one arg per line, with the quotes and backslashes removed. +# +# In Bash we could simply go: +# +# readarray ARGS < <( xargs -n1 <<<"$var" ) && +# set -- "${ARGS[@]}" "$@" +# +# but POSIX shell has neither arrays nor command substitution, so instead we +# post-process each arg (as a line of input to sed) to backslash-escape any +# character that might be a shell metacharacter, then use eval to reverse +# that process (while maintaining the separation between arguments), and wrap +# the whole thing up as a single "set" statement. +# +# This will of course break if any of these variables contains a newline or +# an unmatched quote. +# + +eval "set -- $( + printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" | + xargs -n1 | + sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' | + tr '\n' ' ' + )" '"$@"' + +exec "$JAVACMD" "$@" diff --git a/my-framework/di-practice/gradlew.bat b/my-framework/di-practice/gradlew.bat new file mode 100644 index 00000000..107acd32 --- /dev/null +++ b/my-framework/di-practice/gradlew.bat @@ -0,0 +1,89 @@ +@rem +@rem Copyright 2015 the original author or authors. +@rem +@rem Licensed under the Apache License, Version 2.0 (the "License"); +@rem you may not use this file except in compliance with the License. +@rem You may obtain a copy of the License at +@rem +@rem https://www.apache.org/licenses/LICENSE-2.0 +@rem +@rem Unless required by applicable law or agreed to in writing, software +@rem distributed under the License is distributed on an "AS IS" BASIS, +@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +@rem See the License for the specific language governing permissions and +@rem limitations under the License. +@rem + +@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 Resolve any "." and ".." in APP_HOME to make it shorter. +for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi + +@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" "-Xms64m" + +@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 execute + +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 execute + +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 + +: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 %* + +: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 diff --git a/my-framework/di-practice/settings.gradle b/my-framework/di-practice/settings.gradle new file mode 100644 index 00000000..4c4bc909 --- /dev/null +++ b/my-framework/di-practice/settings.gradle @@ -0,0 +1,2 @@ +rootProject.name = 'di-practice' + diff --git a/my-framework/di-practice/src/main/java/org/example/Main.java b/my-framework/di-practice/src/main/java/org/example/Main.java new file mode 100644 index 00000000..33591afd --- /dev/null +++ b/my-framework/di-practice/src/main/java/org/example/Main.java @@ -0,0 +1,4 @@ +package org.example; + +public class Main { +} diff --git a/my-framework/di-practice/src/main/java/org/example/annotation/Controller.java b/my-framework/di-practice/src/main/java/org/example/annotation/Controller.java new file mode 100644 index 00000000..bf404417 --- /dev/null +++ b/my-framework/di-practice/src/main/java/org/example/annotation/Controller.java @@ -0,0 +1,11 @@ +package org.example.annotation; + +import java.lang.annotation.ElementType; +import java.lang.annotation.Retention; +import java.lang.annotation.RetentionPolicy; +import java.lang.annotation.Target; + +@Target({ElementType.TYPE}) +@Retention(RetentionPolicy.RUNTIME) +public @interface Controller { +} diff --git a/my-framework/di-practice/src/main/java/org/example/annotation/Inject.java b/my-framework/di-practice/src/main/java/org/example/annotation/Inject.java new file mode 100644 index 00000000..dcd8f2d8 --- /dev/null +++ b/my-framework/di-practice/src/main/java/org/example/annotation/Inject.java @@ -0,0 +1,11 @@ +package org.example.annotation; + +import java.lang.annotation.ElementType; +import java.lang.annotation.Retention; +import java.lang.annotation.RetentionPolicy; +import java.lang.annotation.Target; + +@Target({ElementType.METHOD, ElementType.CONSTRUCTOR, ElementType.FIELD}) +@Retention(RetentionPolicy. RUNTIME) +public @interface Inject { +} diff --git a/my-framework/di-practice/src/main/java/org/example/annotation/Repository.java b/my-framework/di-practice/src/main/java/org/example/annotation/Repository.java new file mode 100644 index 00000000..202a9261 --- /dev/null +++ b/my-framework/di-practice/src/main/java/org/example/annotation/Repository.java @@ -0,0 +1,11 @@ +package org.example.annotation; + +import java.lang.annotation.ElementType; +import java.lang.annotation.Retention; +import java.lang.annotation.RetentionPolicy; +import java.lang.annotation.Target; + +@Target({ElementType.TYPE}) +@Retention(RetentionPolicy.RUNTIME) +public @interface Repository { +} diff --git a/my-framework/di-practice/src/main/java/org/example/annotation/Service.java b/my-framework/di-practice/src/main/java/org/example/annotation/Service.java new file mode 100644 index 00000000..8739299f --- /dev/null +++ b/my-framework/di-practice/src/main/java/org/example/annotation/Service.java @@ -0,0 +1,11 @@ +package org.example.annotation; + +import java.lang.annotation.ElementType; +import java.lang.annotation.Retention; +import java.lang.annotation.RetentionPolicy; +import java.lang.annotation.Target; + +@Target({ElementType.TYPE}) +@Retention(RetentionPolicy.RUNTIME) +public @interface Service { +} diff --git a/my-framework/di-practice/src/main/java/org/example/controller/UserController.java b/my-framework/di-practice/src/main/java/org/example/controller/UserController.java new file mode 100644 index 00000000..e53244a6 --- /dev/null +++ b/my-framework/di-practice/src/main/java/org/example/controller/UserController.java @@ -0,0 +1,20 @@ +package org.example.controller; + +import org.example.annotation.Controller; +import org.example.annotation.Inject; +import org.example.service.UserService; + +@Controller +public class UserController { + + private final UserService userService; + + @Inject + public UserController(UserService userService) { + this.userService = userService; + } + + public UserService getUserService() { + return userService; + } +} diff --git a/my-framework/di-practice/src/main/java/org/example/di/BeanFactory.java b/my-framework/di-practice/src/main/java/org/example/di/BeanFactory.java new file mode 100644 index 00000000..c9f7628e --- /dev/null +++ b/my-framework/di-practice/src/main/java/org/example/di/BeanFactory.java @@ -0,0 +1,67 @@ +package org.example.di; + +import org.example.annotation.Inject; +import org.reflections.ReflectionUtils; + +import java.lang.reflect.Constructor; +import java.lang.reflect.InvocationTargetException; +import java.util.*; + +public class BeanFactory { + + private final Set> preInstantiatedClass; + private final Map, Object> beans = new HashMap<>(); + + public BeanFactory(Set> preInstantiatedClass) { + this.preInstantiatedClass = preInstantiatedClass; + initialize(); + } + + private void initialize() { + for (Class clazz : preInstantiatedClass) { + Object instance = createInstance(clazz); + beans.put(clazz, instance); + } + } + + private Object createInstance(Class clazz) { + Constructor constructor = findConstructor(clazz); + + List parameters = new ArrayList<>(); + + for (Class typeClass : constructor.getParameterTypes()) { + parameters.add(getParameterByClass(typeClass)); + } + + try { + return constructor.newInstance(parameters.toArray()); + } catch (InstantiationException | IllegalAccessException | InvocationTargetException e) { + throw new RuntimeException(e); + } + } + + + private Constructor findConstructor(Class clazz) { + Constructor constructor = BeanFactoryUtils.getInjectedConstructor(clazz); + + if (Objects.nonNull(constructor)) { + return constructor; + } + + return clazz.getConstructors()[0]; + } + + private Object getParameterByClass(Class typeClass) { + Object instanceBean = getBean(typeClass); + + if (Objects.nonNull(instanceBean)){ + return instanceBean; + } + + return createInstance(typeClass); + } + + public T getBean(Class requiredType) { + return (T) beans.get(requiredType); + } +} diff --git a/my-framework/di-practice/src/main/java/org/example/di/BeanFactoryUtils.java b/my-framework/di-practice/src/main/java/org/example/di/BeanFactoryUtils.java new file mode 100644 index 00000000..a7f02ac8 --- /dev/null +++ b/my-framework/di-practice/src/main/java/org/example/di/BeanFactoryUtils.java @@ -0,0 +1,20 @@ +package org.example.di; + +import org.example.annotation.Inject; +import org.reflections.ReflectionUtils; + +import java.lang.reflect.Constructor; +import java.util.Set; + +public class BeanFactoryUtils { + + public static Constructor getInjectedConstructor(Class clazz) { + Set injectedConstructor = ReflectionUtils.getAllConstructors(clazz, ReflectionUtils.withAnnotation(Inject.class)); + + if (injectedConstructor.isEmpty()) { + return null; + } + + return injectedConstructor.iterator().next(); + } +} diff --git a/my-framework/di-practice/src/main/java/org/example/repository/UserRepository.java b/my-framework/di-practice/src/main/java/org/example/repository/UserRepository.java new file mode 100644 index 00000000..6083648b --- /dev/null +++ b/my-framework/di-practice/src/main/java/org/example/repository/UserRepository.java @@ -0,0 +1,7 @@ +package org.example.repository; + +import org.example.annotation.Repository; + +@Repository +public class UserRepository { +} diff --git a/my-framework/di-practice/src/main/java/org/example/service/UserService.java b/my-framework/di-practice/src/main/java/org/example/service/UserService.java new file mode 100644 index 00000000..498bbbb0 --- /dev/null +++ b/my-framework/di-practice/src/main/java/org/example/service/UserService.java @@ -0,0 +1,20 @@ +package org.example.service; + +import org.example.annotation.Inject; +import org.example.annotation.Service; +import org.example.repository.UserRepository; + +@Service +public class UserService { + + private final UserRepository userRepository; + + @Inject + public UserService(UserRepository userRepository) { + this.userRepository = userRepository; + } + + public UserRepository getUserRepository() { + return userRepository; + } +} diff --git a/my-framework/di-practice/src/test/java/org/example/di/BeanFactoryTest.java b/my-framework/di-practice/src/test/java/org/example/di/BeanFactoryTest.java new file mode 100644 index 00000000..b3463341 --- /dev/null +++ b/my-framework/di-practice/src/test/java/org/example/di/BeanFactoryTest.java @@ -0,0 +1,49 @@ +package org.example.di; + +import org.assertj.core.api.Assertions; +import org.example.annotation.Controller; +import org.example.annotation.Repository; +import org.example.annotation.Service; +import org.example.controller.UserController; +import org.junit.jupiter.api.BeforeEach; +import org.junit.jupiter.api.Test; +import org.reflections.Reflections; + +import java.lang.annotation.Annotation; +import java.util.HashSet; +import java.util.Set; + +import static org.assertj.core.api.Assertions.*; + +class BeanFactoryTest { + + private Reflections reflections; + private BeanFactory beanFactory; + + @BeforeEach + void setUp() { + reflections = new Reflections("org.example"); + Set> preInstantiatedClass = getTypesAnnotatedWith(Controller.class, Service.class, Repository.class); + beanFactory = new BeanFactory(preInstantiatedClass); + + } + + private Set> getTypesAnnotatedWith(Class... annotations) { + Set> beans = new HashSet<>(); + + for (Class annotation : annotations) { + beans.addAll(reflections.getTypesAnnotatedWith(annotation)); + } + + return beans; + } + + @Test + void diTest() { + UserController userController = beanFactory.getBean(UserController.class); + + assertThat(userController).isNotNull(); + assertThat(userController.getUserService()).isNotNull(); + assertThat(userController.getUserService().getUserRepository()).isNotNull(); + } +} \ No newline at end of file