Implemented user repository

LoadBalancerWeb/.gitignore

@@ -0,0 +1,38 @@
+node_modules
+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/

LoadBalancerWeb/build.gradle

@@ -0,0 +1,48 @@
+plugins {
+    id 'java'
+    id 'org.springframework.boot' version '3.1.5'
+    id 'io.spring.dependency-management' version '1.1.3'
+    id 'com.vaadin' version '24.2.2'
+}
+
+group = 'ru.dragonestia'
+version = '0.0.1-SNAPSHOT'
+
+java {
+    sourceCompatibility = '17'
+}
+
+configurations {
+    compileOnly {
+        extendsFrom annotationProcessor
+    }
+}
+
+repositories {
+    mavenCentral()
+}
+
+ext {
+    set('vaadinVersion', "24.2.2")
+}
+
+dependencies {
+    implementation 'com.vaadin:vaadin-spring-boot-starter'
+    compileOnly 'org.projectlombok:lombok'
+    annotationProcessor 'org.projectlombok:lombok'
+    testImplementation 'org.springframework.boot:spring-boot-starter-test'
+}
+
+dependencyManagement {
+    imports {
+        mavenBom "com.vaadin:vaadin-bom:${vaadinVersion}"
+    }
+}
+
+tasks.named('bootBuildImage') {
+    builder = 'paketobuildpacks/builder-jammy-base:latest'
+}
+
+tasks.named('test') {
+    useJUnitPlatform()
+}

LoadBalancerWeb/frontend/generated/flow/generated-flow-imports.d.ts

@@ -0,0 +1 @@
+export {}

LoadBalancerWeb/frontend/generated/flow/generated-flow-imports.js

@@ -0,0 +1,88 @@
+import '@vaadin/common-frontend/ConnectionIndicator.js';
+import '@vaadin/polymer-legacy-adapter/style-modules.js';
+import '@vaadin/accordion/src/vaadin-accordion.js';
+import '@vaadin/details/src/vaadin-details.js';
+import '@vaadin/accordion/src/vaadin-accordion-panel.js';
+import '@vaadin/app-layout/src/vaadin-app-layout.js';
+import '@vaadin/button/src/vaadin-button.js';
+import 'Frontend/generated/jar-resources/buttonFunctions.js';
+import '@vaadin/app-layout/src/vaadin-drawer-toggle.js';
+import '@vaadin/avatar/src/vaadin-avatar.js';
+import '@vaadin/avatar-group/src/vaadin-avatar-group.js';
+import '@vaadin/checkbox/src/vaadin-checkbox.js';
+import '@vaadin/checkbox-group/src/vaadin-checkbox-group.js';
+import '@vaadin/combo-box/src/vaadin-combo-box.js';
+import 'Frontend/generated/jar-resources/flow-component-renderer.js';
+import 'Frontend/generated/jar-resources/comboBoxConnector.js';
+import '@vaadin/multi-select-combo-box/src/vaadin-multi-select-combo-box.js';
+import '@vaadin/confirm-dialog/src/vaadin-confirm-dialog.js';
+import '@vaadin/context-menu/src/vaadin-context-menu.js';
+import 'Frontend/generated/jar-resources/contextMenuConnector.js';
+import 'Frontend/generated/jar-resources/contextMenuTargetConnector.js';
+import '@vaadin/custom-field/src/vaadin-custom-field.js';
+import '@vaadin/date-picker/src/vaadin-date-picker.js';
+import 'Frontend/generated/jar-resources/datepickerConnector.js';
+import '@vaadin/date-time-picker/src/vaadin-date-time-picker.js';
+import '@vaadin/time-picker/src/vaadin-time-picker.js';
+import 'Frontend/generated/jar-resources/vaadin-time-picker/timepickerConnector.js';
+import '@vaadin/dialog/src/vaadin-dialog.js';
+import 'Frontend/generated/jar-resources/dndConnector.js';
+import '@vaadin/field-highlighter/src/vaadin-field-highlighter.js';
+import '@vaadin/form-layout/src/vaadin-form-layout.js';
+import '@vaadin/form-layout/src/vaadin-form-item.js';
+import '@vaadin/grid/src/vaadin-grid-column-group.js';
+import '@vaadin/grid/src/vaadin-grid.js';
+import '@vaadin/grid/src/vaadin-grid-column.js';
+import '@vaadin/grid/src/vaadin-grid-sorter.js';
+import 'Frontend/generated/jar-resources/gridConnector.js';
+import '@vaadin/tooltip/src/vaadin-tooltip.js';
+import 'Frontend/generated/jar-resources/vaadin-grid-flow-selection-column.js';
+import '@vaadin/icon/src/vaadin-icon.js';
+import '@vaadin/icons/vaadin-iconset.js';
+import '@vaadin/list-box/src/vaadin-list-box.js';
+import '@vaadin/item/src/vaadin-item.js';
+import '@vaadin/login/src/vaadin-login-form.js';
+import '@vaadin/login/src/vaadin-login-overlay.js';
+import 'Frontend/generated/jar-resources/menubarConnector.js';
+import '@vaadin/menu-bar/src/vaadin-menu-bar.js';
+import '@vaadin/message-input/src/vaadin-message-input.js';
+import 'Frontend/generated/jar-resources/messageListConnector.js';
+import '@vaadin/message-list/src/vaadin-message-list.js';
+import '@vaadin/notification/src/vaadin-notification.js';
+import '@vaadin/horizontal-layout/src/vaadin-horizontal-layout.js';
+import '@vaadin/scroller/src/vaadin-scroller.js';
+import '@vaadin/vertical-layout/src/vaadin-vertical-layout.js';
+import '@vaadin/progress-bar/src/vaadin-progress-bar.js';
+import '@vaadin/radio-group/src/vaadin-radio-button.js';
+import '@vaadin/radio-group/src/vaadin-radio-group.js';
+import '@vaadin/select/src/vaadin-select.js';
+import 'Frontend/generated/jar-resources/selectConnector.js';
+import 'Frontend/generated/jar-resources/tooltip.ts';
+import '@vaadin/side-nav/src/vaadin-side-nav.js';
+import '@vaadin/side-nav/src/vaadin-side-nav-item.js';
+import '@vaadin/split-layout/src/vaadin-split-layout.js';
+import '@vaadin/tabs/src/vaadin-tab.js';
+import '@vaadin/tabsheet/src/vaadin-tabsheet.js';
+import '@vaadin/tabs/src/vaadin-tabs.js';
+import 'Frontend/generated/jar-resources/vaadin-big-decimal-field.js';
+import '@vaadin/email-field/src/vaadin-email-field.js';
+import '@vaadin/integer-field/src/vaadin-integer-field.js';
+import '@vaadin/number-field/src/vaadin-number-field.js';
+import '@vaadin/password-field/src/vaadin-password-field.js';
+import '@vaadin/text-area/src/vaadin-text-area.js';
+import '@vaadin/text-field/src/vaadin-text-field.js';
+import 'Frontend/generated/jar-resources/lit-renderer.ts';
+import '@vaadin/grid/src/vaadin-grid-tree-toggle.js';
+import '@vaadin/upload/src/vaadin-upload.js';
+import '@vaadin/virtual-list/src/vaadin-virtual-list.js';
+import 'Frontend/generated/jar-resources/virtualListConnector.js';
+import '@vaadin/vaadin-lumo-styles/color-global.js';
+import '@vaadin/vaadin-lumo-styles/typography-global.js';
+import '@vaadin/vaadin-lumo-styles/sizing.js';
+import '@vaadin/vaadin-lumo-styles/spacing.js';
+import '@vaadin/vaadin-lumo-styles/style.js';
+import '@vaadin/vaadin-lumo-styles/vaadin-iconset.js';
+const loadOnDemand = (key) => { return Promise.resolve(0); }
+window.Vaadin = window.Vaadin || {};
+window.Vaadin.Flow = window.Vaadin.Flow || {};
+window.Vaadin.Flow.loadOnDemand = loadOnDemand;

LoadBalancerWeb/frontend/generated/vaadin-featureflags.js

@@ -0,0 +1,8 @@
+// @ts-nocheck
+window.Vaadin = window.Vaadin || {};
+window.Vaadin.featureFlags = window.Vaadin.featureFlags || {};
+window.Vaadin.featureFlags.exampleFeatureFlag = false;
+window.Vaadin.featureFlags.collaborationEngineBackend = false;
+window.Vaadin.featureFlags.webPush = false;
+window.Vaadin.featureFlags.formFillerAddon = false;
+export {};

LoadBalancerWeb/frontend/generated/vaadin.ts

@@ -0,0 +1,5 @@
+import './vaadin-featureflags.js';
+
+import './index';
+
+import 'Frontend/generated/jar-resources/vaadin-dev-tools/vaadin-dev-tools.js';

LoadBalancerWeb/frontend/index.html

@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<!--
+This file is auto-generated by Vaadin.
+-->
+
+<html>
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1" />
+  <style>
+    body, #outlet {
+      height: 100vh;
+      width: 100%;
+      margin: 0;
+    }
+  </style>
+  <!-- index.ts is included here automatically (either by the dev server or during the build) -->
+</head>
+<body>
+  <!-- This outlet div is where the views are rendered -->
+  <div id="outlet"></div>
+</body>
+</html>

LoadBalancerWeb/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

LoadBalancerWeb/gradlew

@@ -0,0 +1,249 @@
+#!/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/HEAD/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
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&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: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$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
+
+
+# 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"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$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 "$JAVACMD" "$@"

LoadBalancerWeb/gradlew.bat

@@ -0,0 +1,92 @@
+@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=.
+@rem This is normally unused
+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% equ 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% equ 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!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

LoadBalancerWeb/settings.gradle

@@ -0,0 +1 @@
+rootProject.name = 'LoadBalancerWeb'

src/main/java/ru/dragonestia/loadbalancer/repository/UserRepository.java

@@ -0,0 +1,16 @@
+package ru.dragonestia.loadbalancer.repository;
+
+import ru.dragonestia.loadbalancer.model.Bucket;
+import ru.dragonestia.loadbalancer.model.User;
+
+import java.util.Collection;
+import java.util.List;
+
+public interface UserRepository {
+
+    void linkWithBucket(Bucket bucket, Collection<User> users);
+
+    void unlinkWithBucket(Bucket bucket, Collection<User> users);
+
+    List<Bucket> findAllLinkedUserBuckets(User user);
+}

src/main/java/ru/dragonestia/loadbalancer/repository/impl/UserRepositoryImpl.java

@@ -0,0 +1,45 @@
+package ru.dragonestia.loadbalancer.repository.impl;
+
+import org.springframework.stereotype.Repository;
+import ru.dragonestia.loadbalancer.model.Bucket;
+import ru.dragonestia.loadbalancer.model.Node;
+import ru.dragonestia.loadbalancer.model.User;
+import ru.dragonestia.loadbalancer.repository.UserRepository;
+
+import java.util.*;
+import java.util.concurrent.ConcurrentHashMap;
+
+@Repository
+public class UserRepositoryImpl implements UserRepository {
+
+    private final Map<User, Set<Bucket>> usersMap = new ConcurrentHashMap<>();
+
+    @Override
+    public void linkWithBucket(Bucket bucket, Collection<User> users) {
+        synchronized (usersMap) {
+            for (var user: users) {
+                var set = usersMap.getOrDefault(user, new HashSet<>());
+                set.add(bucket);
+                usersMap.put(user, set);
+            }
+        }
+    }
+
+    @Override
+    public void unlinkWithBucket(Bucket bucket, Collection<User> users) {
+        synchronized (usersMap) {
+            for (var user: users) {
+                var set = usersMap.getOrDefault(user, new HashSet<>());
+                set.remove(bucket);
+                usersMap.put(user, set);
+            }
+        }
+    }
+
+    @Override
+    public List<Bucket> findAllLinkedUserBuckets(User user) {
+        synchronized (usersMap) {
+            return usersMap.getOrDefault(user, new HashSet<>()).stream().toList();
+        }
+    }
+}