diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..869d741
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,43 @@
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+.idea
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..668101a
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,19 @@
+plugins {
+ id 'java'
+}
+
+group = 'com.sprint.mission'
+version = '1.0-SNAPSHOT'
+
+repositories {
+ mavenCentral()
+}
+
+dependencies {
+ testImplementation platform('org.junit:junit-bom:5.10.0')
+ testImplementation 'org.junit.jupiter:junit-jupiter'
+}
+
+test {
+ useJUnitPlatform()
+}
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..249e583
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..d9ed5f1
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Thu May 29 10:30:57 KST 2025
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..1b6c787
--- /dev/null
+++ b/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/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..ac1b06f
--- /dev/null
+++ b/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/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..84879dc
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1 @@
+rootProject.name = '1-sprint-mission'
\ No newline at end of file
diff --git a/src/main/java/com/sprint/mission/Main.java b/src/main/java/com/sprint/mission/Main.java
new file mode 100644
index 0000000..d18aceb
--- /dev/null
+++ b/src/main/java/com/sprint/mission/Main.java
@@ -0,0 +1,20 @@
+package com.sprint.mission;
+
+import java.util.UUID;
+
+//TIP To Run code, press or
+// click the icon in the gutter.
+public class Main {
+ public static void main(String[] args) {
+ //TIP Press with your caret at the highlighted text
+ // to see how IntelliJ IDEA suggests fixing it.
+ System.out.printf("Hello and welcome!");
+
+ for (int i = 1; i <= 5; i++) {
+ //TIP Press to start debugging your code. We have set one breakpoint
+ // for you, but you can always add more by pressing .
+ System.out.println("i = " + i);
+
+ }
+ }
+}
\ No newline at end of file
diff --git a/src/main/java/com/sprint/mission/discodeit/entity/BaseEntity.java b/src/main/java/com/sprint/mission/discodeit/entity/BaseEntity.java
new file mode 100644
index 0000000..f982e90
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/entity/BaseEntity.java
@@ -0,0 +1,31 @@
+package com.sprint.mission.discodeit.entity;
+
+import java.util.UUID;
+
+public class BaseEntity {
+ private UUID id;
+ private Long createdAt;
+ private Long updatedAt;
+
+ public BaseEntity() {
+ this.id = UUID.randomUUID();
+ this.createdAt = System.currentTimeMillis();
+ this.updatedAt = createdAt;
+ }
+
+ public UUID getId() {
+ return id;
+ }
+
+ public Long getCreatedAt() {
+ return createdAt;
+ }
+
+ public Long getUpdatedAt() {
+ return updatedAt;
+ }
+
+ public void touchUpdatedAt() {
+ this.updatedAt = System.currentTimeMillis();
+ }
+}
diff --git a/src/main/java/com/sprint/mission/discodeit/entity/Channel.java b/src/main/java/com/sprint/mission/discodeit/entity/Channel.java
new file mode 100644
index 0000000..c4fe911
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/entity/Channel.java
@@ -0,0 +1,67 @@
+package com.sprint.mission.discodeit.entity;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Channel extends BaseEntity {
+ private String channelName;
+ private List users;
+ private List messages;
+
+ public Channel(String channelName) {
+ this.channelName = channelName;
+ this.users = new ArrayList<>();
+ this.messages = new ArrayList<>();
+ }
+
+ public String getChannelName() {
+ return channelName;
+ }
+
+ public void updateName(String newChannelName) {
+ this.channelName = newChannelName;
+ touchUpdatedAt();
+ }
+
+ public void addUser(User user) {
+ if (!users.contains(user)) {
+ users.add(user);
+ user.addChannel(this);
+ }
+ }
+
+ public void deleteUser(User user) {
+ if (users.contains(user)) {
+ users.remove(user);
+ user.deleteChannel(this);
+ }
+ }
+
+ public void addMessage(Message message) {
+ if (!messages.contains(message)) {
+ messages.add(message);
+ }
+ }
+
+ public void deleteMessage(Message message) {
+ if (messages.contains(message)) {
+ messages.remove(message);
+ message.deleteChannel(this);
+ }
+ }
+
+ public List getUsers() {
+ return users;
+ }
+
+ public List getMessages() {
+ return messages;
+ }
+
+ @Override
+ public String toString() {
+ return "Channel{" +
+ "channelName='" + channelName + '\'' +
+ '}';
+ }
+}
diff --git a/src/main/java/com/sprint/mission/discodeit/entity/Message.java b/src/main/java/com/sprint/mission/discodeit/entity/Message.java
new file mode 100644
index 0000000..1844f23
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/entity/Message.java
@@ -0,0 +1,55 @@
+package com.sprint.mission.discodeit.entity;
+
+import java.util.List;
+
+public class Message extends BaseEntity {
+ private User user;
+ private Channel channel;
+ private String content;
+
+ List channels;
+
+
+ public Message(User user, Channel channel, String content) {
+ this.user = user;
+ this.channel = channel;
+ this.content = content;
+ }
+
+ public User getUser() {
+ return user;
+ }
+
+ public Channel getChannel() {
+ return channel;
+ }
+
+ public String getContent() {
+ return content;
+ }
+
+ public List getChannels() {
+ return channels;
+ }
+
+ public void addChannel(Channel channel) {
+ if(!channels.contains(channel)) {
+ channels.add(channel);
+ channel.addMessage(this);
+ }
+ }
+
+ public void deleteChannel(Channel channel) {
+ if(channels.contains(channel)) {
+ channels.remove(channel);
+ channel.deleteMessage(this);
+ }
+ }
+
+ @Override
+ public String toString() {
+ return "Message{" +
+ "content='" + content + '\'' +
+ '}';
+ }
+}
diff --git a/src/main/java/com/sprint/mission/discodeit/entity/User.java b/src/main/java/com/sprint/mission/discodeit/entity/User.java
new file mode 100644
index 0000000..83ddf7c
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/entity/User.java
@@ -0,0 +1,92 @@
+package com.sprint.mission.discodeit.entity;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class User extends BaseEntity {
+ private String email;
+ private String password;
+ private String username;
+ private String displayName;
+ private UserStatus status;
+
+ private List channels;
+ private List messages;
+
+ public User() {
+ this.channels = new ArrayList<>();
+ this.messages = new ArrayList<>();
+ }
+
+ public User(String email, String password, String username, String displayName) {
+ this.email = email;
+ this.password = password;
+ this.username = username;
+ this.displayName = displayName;
+ this.status = UserStatus.ACTIVE; // 기본 활성화 상태
+ this.channels = new ArrayList<>();
+ this.messages = new ArrayList<>();
+ }
+
+
+ public String getEmail() {
+ return email;
+ }
+
+ public String getUsername() {
+ return username;
+ }
+
+ public String getDisplayName() {
+ return displayName;
+ }
+
+ public String getPassword() {
+ return password;
+ }
+
+ public UserStatus getStatus() {
+ return status;
+ }
+
+ public void updateUserDisplayName(String newDisplayName) {
+ this.displayName = newDisplayName;
+ touchUpdatedAt();
+ }
+
+ public void updateUserStatus(UserStatus newStatus) {
+ this.status = newStatus;
+ touchUpdatedAt();
+ }
+
+
+ public void addChannel(Channel channel) {
+ if (!channels.contains(channel)) {
+ channels.add(channel);
+ channel.addUser(this);
+ }
+ }
+
+ public void deleteChannel(Channel channel) {
+ if (channels.contains(channel)) {
+ channels.remove(channel);
+ channel.deleteUser(this);
+ }
+ }
+
+
+ public List getMessages() {
+ return messages;
+ }
+
+ @Override
+ public String toString() {
+ return "User{" +
+ "email='" + email + '\'' +
+ ", password='" + password + '\'' +
+ ", username='" + username + '\'' +
+ ", displayName='" + displayName + '\'' +
+ ", status=" + status +
+ '}';
+ }
+}
diff --git a/src/main/java/com/sprint/mission/discodeit/entity/UserStatus.java b/src/main/java/com/sprint/mission/discodeit/entity/UserStatus.java
new file mode 100644
index 0000000..7a8e887
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/entity/UserStatus.java
@@ -0,0 +1,5 @@
+package com.sprint.mission.discodeit.entity;
+
+public enum UserStatus {
+ ACTIVE, INACTIVE, DELETED
+}
diff --git a/src/main/java/com/sprint/mission/discodeit/factory/JCFServiceFactory.java b/src/main/java/com/sprint/mission/discodeit/factory/JCFServiceFactory.java
new file mode 100644
index 0000000..9a111fd
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/factory/JCFServiceFactory.java
@@ -0,0 +1,23 @@
+package com.sprint.mission.discodeit.factory;
+
+import com.sprint.mission.discodeit.service.ChannelService;
+import com.sprint.mission.discodeit.service.MessageService;
+import com.sprint.mission.discodeit.service.UserService;
+import com.sprint.mission.discodeit.service.jcf.JCFChannelService;
+import com.sprint.mission.discodeit.service.jcf.JCFMessageService;
+import com.sprint.mission.discodeit.service.jcf.JCFUserService;
+
+public class JCFServiceFactory {
+
+ public UserService createUserService() {
+ return new JCFUserService();
+ }
+
+ public ChannelService createChannelService() {
+ return new JCFChannelService();
+ }
+
+ public MessageService createMessageService() {
+ return new JCFMessageService();
+ }
+}
diff --git a/src/main/java/com/sprint/mission/discodeit/run/JavaApplication.java b/src/main/java/com/sprint/mission/discodeit/run/JavaApplication.java
new file mode 100644
index 0000000..b9a7021
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/run/JavaApplication.java
@@ -0,0 +1,211 @@
+package com.sprint.mission.discodeit.run;
+
+import com.sprint.mission.discodeit.entity.Channel;
+import com.sprint.mission.discodeit.entity.Message;
+import com.sprint.mission.discodeit.entity.User;
+import com.sprint.mission.discodeit.entity.UserStatus;
+import com.sprint.mission.discodeit.factory.JCFServiceFactory;
+import com.sprint.mission.discodeit.service.ChannelService;
+import com.sprint.mission.discodeit.service.MessageService;
+import com.sprint.mission.discodeit.service.UserService;
+
+import java.util.List;
+import java.util.Optional;
+
+public class JavaApplication {
+
+ public static void main(String[] args) {
+ JCFServiceFactory serviceFactory = new JCFServiceFactory();
+ UserService userService = serviceFactory.createUserService();
+ ChannelService channelService = serviceFactory.createChannelService();
+ MessageService messageService = serviceFactory.createMessageService();
+
+ // ===== UserService 테스트 =====
+ // 1. 사용자 생성
+ User spring = new User("spring@example.com", "password123", "spring", "Love Spring");
+ User jpa = new User("jpa@example.com", "word124567", "jpa", "Good Jpa");
+ User java = new User("java@example.com", "secure123", "java", "Fan Java");
+ userService.createUser(spring);
+ userService.createUser(jpa);
+ userService.createUser(java);
+
+ // 2, 단건 조회
+ System.out.println("=== User 단건 조회 (Spring) ===");
+ Optional maybeSpring = userService.getUserByUserId(spring.getId());
+ if (maybeSpring.isPresent()) {
+ System.out.println(maybeSpring);
+ } else {
+ System.out.println("등록되지 않은 사용자 입니다.");
+ }
+
+ // 3. 다건 조회
+ System.out.println("\n=== User 전체 조회 ===");
+ List allUsers = userService.getUsers();
+ if (allUsers != null) {
+ allUsers.forEach(System.out::println);
+ } else {
+ System.out.println("등록된 사용자가 없습니다.");
+ }
+
+ // 4. 사용자 업데이트 (displayName 변경)
+ jpa.updateUserDisplayName("Nice Jpa");
+ System.out.println("\n=== User 수정 (Good Jpa -> Nice Jpa) ===");
+ if (allUsers != null) {
+ userService.updateUser(jpa.getId(), jpa);
+ System.out.println(jpa);
+ System.out.println("\n=== User 수정 후 전체 조회===");
+ allUsers.forEach(System.out::println);
+ } else {
+ System.out.println("업데이트 대상 사용자가 없습니다.");
+ }
+
+ // 5. 사용자 상태 업데이트 (UserStatus 변경)
+ java.updateUserStatus(UserStatus.DELETED);
+ System.out.println("\n=== UserStatus 수정 (ACTIVE -> DELETED) ===");
+ Optional javaStatus = userService.updateUser(java.getId(), java);
+ if (allUsers != null) {
+ System.out.println("변경된 상태: " + javaStatus.get().getStatus());
+ allUsers.forEach(System.out::println);
+ } else {
+ System.out.println("업데이트 대상 사용자가 없습니다.");
+ }
+
+ // 6. 사용자 삭제 (by status)
+ System.out.println("\n=== User 삭제 (Java by status) ===");
+ if (allUsers != null) {
+ userService.deleteUser(java, java.getStatus());
+ System.out.println("=== User 삭제 후 전체 조회===");
+ allUsers = userService.getUsers();
+ if (allUsers != null) {
+ allUsers.forEach(System.out::println);
+ } else {
+ System.out.println("등록된 사용자가 없습니다.");
+ }
+ } else {
+ System.out.println("등록되지 않은 사용자입니다.");
+ }
+
+ // ===== ChannelService 테스트 =====
+
+ // 1. 채널 생성
+ Channel studyChannel = new Channel("I love Study");
+ Channel gameChannel = new Channel("Game with me");
+ channelService.createChannel(studyChannel);
+ channelService.createChannel(gameChannel);
+
+ // 2. 단건 조회
+ System.out.println("\n=== Channel 단건 조회 (Study) ===");
+ Optional maybeStudyChannel = channelService.getChannelById(studyChannel.getId());
+ if (maybeStudyChannel.isPresent()) {
+ System.out.println(maybeStudyChannel);
+ } else {
+ System.out.println("해당 채널이 없습니다.");
+ }
+
+ // 3. 다건 조회
+ System.out.println("\n=== Channel 전체 조회 ===");
+ List allChannels = channelService.getChannels();
+ if (allChannels != null) {
+ allChannels.forEach(System.out::println);
+ } else {
+ System.out.println("등록된 채널이 없습니다.");
+ }
+
+ // 4. 채널명 업데이트 (channelName 변경)
+ System.out.println("\n=== Channel 수정 (I love Study -> I hate Study) ===");
+ if (allChannels != null) {
+ channelService.updateChannel(studyChannel.getId(), "I hate Study");
+ System.out.println(studyChannel);
+ System.out.println("\n=== User 수정 후 전체 조회===");
+ allChannels.forEach(System.out::println);
+ } else {
+ System.out.println("업데이트 대상 채널이 없습니다.");
+ }
+
+ // 5. 사용자 채널 참여
+ System.out.println("\n=== User JPA를 Channel Game with me에 참여시키기 ===");
+ if (allChannels != null && allUsers != null) {
+ channelService.joinUserToChannel(gameChannel, jpa);
+ System.out.println("채널 '" + gameChannel.getChannelName() + "'의 사용자 목록:");
+ List usersInGame = gameChannel.getUsers();
+
+ if (usersInGame != null) {
+ usersInGame.forEach(System.out::println);
+ } else {
+ System.out.println("등록된 사용자가 없습니다.");
+ }
+ } else {
+ System.out.println("채널 또는 사용자 정보가 없습니다.");
+ }
+
+ // 6. 사용자 채널 퇴장
+ System.out.println("\n=== User JPA를 Channel Game with me에서 퇴장시키기===");
+ if (allChannels != null && allUsers != null) {
+ channelService.deleteUserToChannel(gameChannel, jpa);
+ System.out.println("채널 '" + gameChannel.getChannelName() + "'의 사용자 목록:");
+ List usersInGame = gameChannel.getUsers();
+
+ if (!usersInGame.isEmpty()) {
+ usersInGame.forEach(System.out::println);
+ } else {
+ System.out.println("등록된 사용자가 없습니다.");
+ }
+ } else {
+ System.out.println("채널 또는 사용자 정보가 없습니다.");
+ }
+
+
+ // 7. 채널 삭제 (by channelId)
+ System.out.println("\n=== Channel 삭제 (I hate Study by channel) ===");
+ if (studyChannel.getId() != null) {
+ channelService.deleteChannel(studyChannel);
+ System.out.println("=== Channel 삭제 후 전체 조회===");
+ allChannels = channelService.getChannels();
+ allChannels.forEach(System.out::println);
+ } else {
+ System.out.println("삭제 대상 채널이 없습니다.");
+ }
+
+ // ===== MessageService 테스트 =====
+
+ // 1. 메세지 전송
+ System.out.println("\n=== Message 전송 ===");
+ Message m1 = messageService.sendMessage(gameChannel, jpa, jpa.getDisplayName(), "Hello everyone");
+ Message m2 = messageService.sendMessage(gameChannel, jpa, jpa.getDisplayName(), "Welcome to Game with me Channel");
+
+ // 2. 다건 조회
+ System.out.println("전송된 메시지:");
+ List sentMessages = messageService.getMessages();
+ if (sentMessages != null) {
+ sentMessages.forEach(System.out::println);
+ } else {
+ System.out.println("전송된 메세지가 없습니다.");
+ }
+
+ // 3. 단건 조회
+ System.out.println("\n=== Message 단건 조회 (첫 번째 메시지) ===");
+ Optional maybeM1Message = messageService.getMessageById(m1.getId());
+ if (maybeM1Message.isPresent()) {
+ System.out.println(maybeM1Message);
+ } else {
+ System.out.println("메세지를 찾을 수 없습니다.");
+ }
+
+ // 4. 채널별 메시지 조회
+ System.out.println("\n=== Channel별 메시지 조회 (gameChannel) ===");
+ if (allChannels != null) {
+
+ List msgsInGameChannel = messageService.getMessageByChannel(gameChannel);
+ if (msgsInGameChannel != null) {
+ msgsInGameChannel.forEach(System.out::println);
+ } else {
+ System.out.println("해당 채널에 전송된 메세지가 없습니다.");
+ }
+ } else {
+ System.out.println("채널 정보가 없습니다.");
+ }
+ }
+}
+
+
+
diff --git a/src/main/java/com/sprint/mission/discodeit/service/ChannelService.java b/src/main/java/com/sprint/mission/discodeit/service/ChannelService.java
new file mode 100644
index 0000000..58183f1
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/service/ChannelService.java
@@ -0,0 +1,19 @@
+package com.sprint.mission.discodeit.service;
+
+import com.sprint.mission.discodeit.entity.Channel;
+import com.sprint.mission.discodeit.entity.User;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+public interface ChannelService {
+
+ Channel createChannel(Channel channel);
+ Optional getChannelById(UUID chanelId);
+ List getChannels();
+ Optional updateChannel(UUID channelId, String newChannelName);
+ void joinUserToChannel(Channel channel, User user);
+ void deleteUserToChannel(Channel channel, User user);
+ void deleteChannel(Channel channel);
+}
diff --git a/src/main/java/com/sprint/mission/discodeit/service/MessageService.java b/src/main/java/com/sprint/mission/discodeit/service/MessageService.java
new file mode 100644
index 0000000..db596f2
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/service/MessageService.java
@@ -0,0 +1,17 @@
+package com.sprint.mission.discodeit.service;
+
+import com.sprint.mission.discodeit.entity.Channel;
+import com.sprint.mission.discodeit.entity.Message;
+import com.sprint.mission.discodeit.entity.User;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+public interface MessageService {
+ Message sendMessage(Channel channel, User user, String displayName, String content);
+ Optional getMessageById(UUID id);
+ List getMessages();
+ List getMessageByChannel(Channel channel);
+ void deleteMessage(UUID id);
+}
diff --git a/src/main/java/com/sprint/mission/discodeit/service/UserService.java b/src/main/java/com/sprint/mission/discodeit/service/UserService.java
new file mode 100644
index 0000000..b68e7fa
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/service/UserService.java
@@ -0,0 +1,20 @@
+package com.sprint.mission.discodeit.service;
+
+import com.sprint.mission.discodeit.entity.Channel;
+import com.sprint.mission.discodeit.entity.User;
+import com.sprint.mission.discodeit.entity.UserStatus;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+public interface UserService {
+
+ User createUser(User user);
+ Optional getUserByUserId(UUID userId);
+ void joinChannelToUser(User user, Channel channel);
+ void deleteUserFromChannel(User user, Channel channel);
+ List getUsers();
+ Optional updateUser(UUID userId, User updateUser);
+ void deleteUser(User user, UserStatus status);
+}
diff --git a/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelService.java b/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelService.java
new file mode 100644
index 0000000..3a9a2d9
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelService.java
@@ -0,0 +1,65 @@
+package com.sprint.mission.discodeit.service.jcf;
+
+import com.sprint.mission.discodeit.entity.Channel;
+import com.sprint.mission.discodeit.entity.User;
+import com.sprint.mission.discodeit.entity.UserStatus;
+import com.sprint.mission.discodeit.service.ChannelService;
+
+import java.util.*;
+
+public class JCFChannelService implements ChannelService {
+ private final List data;
+
+ public JCFChannelService() {
+ this.data = new ArrayList<>();
+ }
+
+ @Override
+ public Channel createChannel(Channel channel) {
+ data.add(channel);
+ return channel;
+ }
+
+
+ @Override
+ public Optional getChannelById(UUID channelId) {
+ return data.stream()
+ .filter(ch -> ch.getId().equals(channelId))
+ .findFirst();
+ }
+
+ @Override
+ public List getChannels() {
+ return data.stream()
+ .toList();
+ }
+
+ @Override
+ public Optional updateChannel(UUID channelId, String newChannelName) {
+ return data.stream()
+ .filter(ch -> ch.getId().equals(channelId))
+ .findFirst()
+ .map(channel -> {
+ channel.updateName(newChannelName);
+ return channel;
+ });
+ }
+
+ @Override
+ public void joinUserToChannel(Channel channel, User user) {
+ if (user.getStatus().equals(UserStatus.ACTIVE)) {
+ channel.addUser(user);
+ }
+ }
+
+ @Override
+ public void deleteUserToChannel(Channel channel, User user) {
+ channel.deleteUser(user);
+ }
+
+
+ @Override
+ public void deleteChannel(Channel channel) {
+ data.removeIf(ch -> ch.getId().equals(channel.getId()));
+ }
+}
diff --git a/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFMessageService.java b/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFMessageService.java
new file mode 100644
index 0000000..6a2bd20
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFMessageService.java
@@ -0,0 +1,52 @@
+package com.sprint.mission.discodeit.service.jcf;
+
+import com.sprint.mission.discodeit.entity.Channel;
+import com.sprint.mission.discodeit.entity.Message;
+import com.sprint.mission.discodeit.entity.User;
+import com.sprint.mission.discodeit.entity.UserStatus;
+import com.sprint.mission.discodeit.service.MessageService;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+public class JCFMessageService implements MessageService {
+ private final List data;
+
+ public JCFMessageService() {
+ this.data = new ArrayList<>();
+ }
+
+ @Override
+ public Message sendMessage(Channel channel, User user, String displayName, String content) {
+ if (user.getStatus() == UserStatus.ACTIVE) {
+ data.add(new Message(user, channel, content));
+ System.out.println(displayName + ": " + content);
+ }
+ return new Message(user, channel, content);
+ }
+
+ @Override
+ public Optional getMessageById(UUID id) {
+ return data.stream()
+ .filter(message -> message.getId().equals(id))
+ .findFirst();
+ }
+
+ @Override
+ public List getMessages() {
+ return data.stream()
+ .toList();
+ }
+
+ @Override
+ public List getMessageByChannel(Channel channel) {
+ return data;
+ }
+
+ @Override
+ public void deleteMessage(UUID messageId) {
+ data.removeIf(message -> message.getId().equals(messageId));
+ }
+}
diff --git a/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFUserService.java b/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFUserService.java
new file mode 100644
index 0000000..bc59f13
--- /dev/null
+++ b/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFUserService.java
@@ -0,0 +1,71 @@
+package com.sprint.mission.discodeit.service.jcf;
+
+import com.sprint.mission.discodeit.entity.Channel;
+import com.sprint.mission.discodeit.entity.User;
+import com.sprint.mission.discodeit.entity.UserStatus;
+import com.sprint.mission.discodeit.service.UserService;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+public class JCFUserService implements UserService {
+ private final List data;
+
+ public JCFUserService() {
+ this.data = new ArrayList<>();
+ }
+
+ @Override
+ public User createUser(User user) {
+ data.add(user);
+ return user;
+ }
+
+ @Override
+ public Optional getUserByUserId(UUID userId) {
+ return data.stream()
+ .filter(u -> u.getStatus().equals(UserStatus.ACTIVE))
+ .filter(u -> u.getId().equals(userId))
+ .findFirst();
+ }
+
+ @Override
+ public List getUsers() {
+ return data.stream()
+ .filter(user -> user.getStatus().equals(UserStatus.ACTIVE))
+ .collect(Collectors.toList());
+ }
+
+ @Override
+ public Optional updateUser(UUID userId, User updateUser) {
+ Optional OptionalUser = data.stream()
+ .filter(u -> u.getId().equals(userId))
+ .findFirst();
+
+ Optional.ofNullable(updateUser.getDisplayName())
+ .ifPresent(name -> updateUser.updateUserDisplayName(name));
+
+ Optional.ofNullable(updateUser.getStatus())
+ .ifPresent(status -> updateUser.updateUserStatus(status));
+
+
+ return OptionalUser;
+ }
+
+
+ @Override
+ public void joinChannelToUser(User user, Channel channel) {
+ user.addChannel(channel);
+ }
+
+ @Override
+ public void deleteUserFromChannel(User user, Channel channel) {
+ user.deleteChannel(channel);
+ }
+
+
+ @Override
+ public void deleteUser(User user, UserStatus status) {
+ data.removeIf(u -> u.getStatus() == UserStatus.DELETED && u.getId().equals(user.getId()));
+ }
+}